powerpc: Merge in the ppc64 version of the prom code.

This brings in the ppc64 version of prom_init.c, prom.c and btext.c
and makes them work for ppc32.  This also brings in the new calling
convention, where the first entry to the kernel (with r5 != 0) goes
to the prom_init code, which then restarts from the beginning (with
r5 == 0) after it has done its stuff.

For now this also brings in the ppc32 version of setup.c.  It also
merges lmb.h.

Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/kernel/Makefile

@@ -5,10 +5,11 @@
 ifeq ($(CONFIG_PPC64),y)
 EXTRA_CFLAGS	+= -mno-minimal-toc
 endif
-
 ifeq ($(CONFIG_PPC32),y)
-extra-$(CONFIG_PPC_STD_MMU)	:= head.o
+CFLAGS_prom_init.o      += -fPIC
 endif
+
+extra-$(CONFIG_PPC_STD_MMU)	:= head.o
 extra-$(CONFIG_PPC64)		:= head_64.o
 extra-$(CONFIG_40x)		:= head_4xx.o
 extra-$(CONFIG_44x)		:= head_44x.o
@@ -18,13 +19,15 @@ extra-$(CONFIG_6xx)		+= idle_6xx.o
 extra-$(CONFIG_PPC_FPU)		+= fpu.o
 extra-y				+= vmlinux.lds
 
-obj-y				:= traps.o
-obj-$(CONFIG_PPC32)		+= semaphore.o process.o
+obj-y				:= traps.o prom.o semaphore.o
+obj-$(CONFIG_PPC32)		+= setup.o process.o
 obj-$(CONFIG_PPC64)		+= idle_power4.o
 ifeq ($(CONFIG_PPC32),y)
+obj-$(CONFIG_PPC_OF)		+= prom_init.o
 obj-$(CONFIG_MODULES)		+= ppc_ksyms.o
 endif
 obj-$(CONFIG_ALTIVEC)		+= vecemu.o vector.o
+obj-$(CONFIG_BOOTX_TEXT)	+= btext.o
 
 ifeq ($(CONFIG_PPC_ISERIES),y)
 arch/powerpc/kernel/head_64.o: arch/powerpc/platforms/iseries/lparmap.s

arch/powerpc/kernel/btext.c

@@ -0,0 +1,852 @@
+/*
+ * Procedures for drawing on the screen early on in the boot process.
+ *
+ * Benjamin Herrenschmidt <benh@kernel.crashing.org>
+ */
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/init.h>
+#include <linux/module.h>
+
+#include <asm/sections.h>
+#include <asm/prom.h>
+#include <asm/btext.h>
+#include <asm/prom.h>
+#include <asm/page.h>
+#include <asm/mmu.h>
+#include <asm/pgtable.h>
+#include <asm/io.h>
+#include <asm/lmb.h>
+#include <asm/processor.h>
+
+#define NO_SCROLL
+
+#ifndef NO_SCROLL
+static void scrollscreen(void);
+#endif
+
+static void draw_byte(unsigned char c, long locX, long locY);
+static void draw_byte_32(unsigned char *bits, unsigned int *base, int rb);
+static void draw_byte_16(unsigned char *bits, unsigned int *base, int rb);
+static void draw_byte_8(unsigned char *bits, unsigned int *base, int rb);
+
+static int g_loc_X;
+static int g_loc_Y;
+static int g_max_loc_X;
+static int g_max_loc_Y;
+
+static int dispDeviceRowBytes;
+static int dispDeviceDepth;
+static int dispDeviceRect[4];
+static unsigned char *dispDeviceBase, *logicalDisplayBase;
+
+unsigned long disp_BAT[2] __initdata = {0, 0};
+
+#define cmapsz	(16*256)
+
+static unsigned char vga_font[cmapsz];
+
+int boot_text_mapped;
+int force_printk_to_btext = 0;
+
+
+/* Calc BAT values for mapping the display and store them
+ * in disp_BAT.  Those values are then used from head.S to map
+ * the display during identify_machine() and MMU_Init()
+ *
+ * The display is mapped to virtual address 0xD0000000, rather
+ * than 1:1, because some some CHRP machines put the frame buffer
+ * in the region starting at 0xC0000000 (KERNELBASE).
+ * This mapping is temporary and will disappear as soon as the
+ * setup done by MMU_Init() is applied.
+ *
+ * For now, we align the BAT and then map 8Mb on 601 and 16Mb
+ * on other PPCs. This may cause trouble if the framebuffer
+ * is really badly aligned, but I didn't encounter this case
+ * yet.
+ */
+void __init
+btext_prepare_BAT(void)
+{
+	unsigned long vaddr = KERNELBASE + 0x10000000;
+	unsigned long addr;
+	unsigned long lowbits;
+
+	addr = (unsigned long)dispDeviceBase;
+	if (!addr) {
+		boot_text_mapped = 0;
+		return;
+	}
+	if (PVR_VER(mfspr(SPRN_PVR)) != 1) {
+		/* 603, 604, G3, G4, ... */
+		lowbits = addr & ~0xFF000000UL;
+		addr &= 0xFF000000UL;
+		disp_BAT[0] = vaddr | (BL_16M<<2) | 2;
+		disp_BAT[1] = addr | (_PAGE_NO_CACHE | _PAGE_GUARDED | BPP_RW);	
+	} else {
+		/* 601 */
+		lowbits = addr & ~0xFF800000UL;
+		addr &= 0xFF800000UL;
+		disp_BAT[0] = vaddr | (_PAGE_NO_CACHE | PP_RWXX) | 4;
+		disp_BAT[1] = addr | BL_8M | 0x40;
+	}
+	logicalDisplayBase = (void *) (vaddr + lowbits);
+}
+
+/* This function will enable the early boot text when doing OF booting. This
+ * way, xmon output should work too
+ */
+void __init
+btext_setup_display(int width, int height, int depth, int pitch,
+		    unsigned long address)
+{
+	g_loc_X = 0;
+	g_loc_Y = 0;
+	g_max_loc_X = width / 8;
+	g_max_loc_Y = height / 16;
+	logicalDisplayBase = (unsigned char *)address;
+	dispDeviceBase = (unsigned char *)address;
+	dispDeviceRowBytes = pitch;
+	dispDeviceDepth = depth;
+	dispDeviceRect[0] = dispDeviceRect[1] = 0;
+	dispDeviceRect[2] = width;
+	dispDeviceRect[3] = height;
+	boot_text_mapped = 1;
+}
+
+/* Here's a small text engine to use during early boot
+ * or for debugging purposes
+ *
+ * todo:
+ *
+ *  - build some kind of vgacon with it to enable early printk
+ *  - move to a separate file
+ *  - add a few video driver hooks to keep in sync with display
+ *    changes.
+ */
+
+void map_boot_text(void)
+{
+	unsigned long base, offset, size;
+	unsigned char *vbase;
+
+	/* By default, we are no longer mapped */
+	boot_text_mapped = 0;
+	if (dispDeviceBase == 0)
+		return;
+	base = ((unsigned long) dispDeviceBase) & 0xFFFFF000UL;
+	offset = ((unsigned long) dispDeviceBase) - base;
+	size = dispDeviceRowBytes * dispDeviceRect[3] + offset
+		+ dispDeviceRect[0];
+	vbase = __ioremap(base, size, _PAGE_NO_CACHE);
+	if (vbase == 0)
+		return;
+	logicalDisplayBase = vbase + offset;
+	boot_text_mapped = 1;
+}
+
+int btext_initialize(struct device_node *np)
+{
+	unsigned int width, height, depth, pitch;
+	unsigned long address = 0;
+	u32 *prop;
+
+	prop = (u32 *)get_property(np, "width", NULL);
+	if (prop == NULL)
+		return -EINVAL;
+	width = *prop;
+	prop = (u32 *)get_property(np, "height", NULL);
+	if (prop == NULL)
+		return -EINVAL;
+	height = *prop;
+	prop = (u32 *)get_property(np, "depth", NULL);
+	if (prop == NULL)
+		return -EINVAL;
+	depth = *prop;
+	pitch = width * ((depth + 7) / 8);
+	prop = (u32 *)get_property(np, "linebytes", NULL);
+	if (prop)
+		pitch = *prop;
+	if (pitch == 1)
+		pitch = 0x1000;
+	prop = (u32 *)get_property(np, "address", NULL);
+	if (prop)
+		address = *prop;
+
+	/* FIXME: Add support for PCI reg properties */
+
+	if (address == 0)
+		return -EINVAL;
+
+	g_loc_X = 0;
+	g_loc_Y = 0;
+	g_max_loc_X = width / 8;
+	g_max_loc_Y = height / 16;
+	logicalDisplayBase = (unsigned char *)address;
+	dispDeviceBase = (unsigned char *)address;
+	dispDeviceRowBytes = pitch;
+	dispDeviceDepth = depth;
+	dispDeviceRect[0] = dispDeviceRect[1] = 0;
+	dispDeviceRect[2] = width;
+	dispDeviceRect[3] = height;
+
+	map_boot_text();
+
+	return 0;
+}
+
+void __init init_boot_display(void)
+{
+	char *name;
+	struct device_node *np = NULL; 
+	int rc = -ENODEV;
+
+	printk("trying to initialize btext ...\n");
+
+	name = (char *)get_property(of_chosen, "linux,stdout-path", NULL);
+	if (name != NULL) {
+		np = of_find_node_by_path(name);
+		if (np != NULL) {
+			if (strcmp(np->type, "display") != 0) {
+				printk("boot stdout isn't a display !\n");
+				of_node_put(np);
+				np = NULL;
+			}
+		}
+	}
+	if (np)
+		rc = btext_initialize(np);
+	if (rc == 0)
+		return;
+
+	for (np = NULL; (np = of_find_node_by_type(np, "display"));) {
+		if (get_property(np, "linux,opened", NULL)) {
+			printk("trying %s ...\n", np->full_name);
+			rc = btext_initialize(np);
+			printk("result: %d\n", rc);
+		}
+		if (rc == 0)
+			return;
+	}
+}
+
+/* Calc the base address of a given point (x,y) */
+static unsigned char * calc_base(int x, int y)
+{
+	unsigned char *base;
+
+	base = logicalDisplayBase;
+	if (base == 0)
+		base = dispDeviceBase;
+	base += (x + dispDeviceRect[0]) * (dispDeviceDepth >> 3);
+	base += (y + dispDeviceRect[1]) * dispDeviceRowBytes;
+	return base;
+}
+
+/* Adjust the display to a new resolution */
+void btext_update_display(unsigned long phys, int width, int height,
+			  int depth, int pitch)
+{
+	if (dispDeviceBase == 0)
+		return;
+
+	/* check it's the same frame buffer (within 256MB) */
+	if ((phys ^ (unsigned long)dispDeviceBase) & 0xf0000000)
+		return;
+
+	dispDeviceBase = (__u8 *) phys;
+	dispDeviceRect[0] = 0;
+	dispDeviceRect[1] = 0;
+	dispDeviceRect[2] = width;
+	dispDeviceRect[3] = height;
+	dispDeviceDepth = depth;
+	dispDeviceRowBytes = pitch;
+	if (boot_text_mapped) {
+		iounmap(logicalDisplayBase);
+		boot_text_mapped = 0;
+	}
+	map_boot_text();
+	g_loc_X = 0;
+	g_loc_Y = 0;
+	g_max_loc_X = width / 8;
+	g_max_loc_Y = height / 16;
+}
+EXPORT_SYMBOL(btext_update_display);
+
+void btext_clearscreen(void)
+{
+	unsigned long *base	= (unsigned long *)calc_base(0, 0);
+	unsigned long width 	= ((dispDeviceRect[2] - dispDeviceRect[0]) *
+					(dispDeviceDepth >> 3)) >> 3;
+	int i,j;
+
+	for (i=0; i<(dispDeviceRect[3] - dispDeviceRect[1]); i++)
+	{
+		unsigned long *ptr = base;
+		for(j=width; j; --j)
+			*(ptr++) = 0;
+		base += (dispDeviceRowBytes >> 3);
+	}
+}
+
+#ifndef NO_SCROLL
+static void scrollscreen(void)
+{
+	unsigned long *src     	= (unsigned long *)calc_base(0,16);
+	unsigned long *dst     	= (unsigned long *)calc_base(0,0);
+	unsigned long width    	= ((dispDeviceRect[2] - dispDeviceRect[0]) *
+				   (dispDeviceDepth >> 3)) >> 3;
+	int i,j;
+
+	for (i=0; i<(dispDeviceRect[3] - dispDeviceRect[1] - 16); i++)
+	{
+		unsigned long *src_ptr = src;
+		unsigned long *dst_ptr = dst;
+		for(j=width; j; --j)
+			*(dst_ptr++) = *(src_ptr++);
+		src += (dispDeviceRowBytes >> 3);
+		dst += (dispDeviceRowBytes >> 3);
+	}
+	for (i=0; i<16; i++)
+	{
+		unsigned long *dst_ptr = dst;
+		for(j=width; j; --j)
+			*(dst_ptr++) = 0;
+		dst += (dispDeviceRowBytes >> 3);
+	}
+}
+#endif /* ndef NO_SCROLL */
+
+void btext_drawchar(char c)
+{
+	int cline = 0;
+#ifdef NO_SCROLL
+	int x;
+#endif
+	if (!boot_text_mapped)
+		return;
+
+	switch (c) {
+	case '\b':
+		if (g_loc_X > 0)
+			--g_loc_X;
+		break;
+	case '\t':
+		g_loc_X = (g_loc_X & -8) + 8;
+		break;
+	case '\r':
+		g_loc_X = 0;
+		break;
+	case '\n':
+		g_loc_X = 0;
+		g_loc_Y++;
+		cline = 1;
+		break;
+	default:
+		draw_byte(c, g_loc_X++, g_loc_Y);
+	}
+	if (g_loc_X >= g_max_loc_X) {
+		g_loc_X = 0;
+		g_loc_Y++;
+		cline = 1;
+	}
+#ifndef NO_SCROLL
+	while (g_loc_Y >= g_max_loc_Y) {
+		scrollscreen();
+		g_loc_Y--;
+	}
+#else
+	/* wrap around from bottom to top of screen so we don't
+	   waste time scrolling each line.  -- paulus. */
+	if (g_loc_Y >= g_max_loc_Y)
+		g_loc_Y = 0;
+	if (cline) {
+		for (x = 0; x < g_max_loc_X; ++x)
+			draw_byte(' ', x, g_loc_Y);
+	}
+#endif
+}
+
+void btext_drawstring(const char *c)
+{
+	if (!boot_text_mapped)
+		return;
+	while (*c)
+		btext_drawchar(*c++);
+}
+
+void btext_drawhex(unsigned long v)
+{
+	char *hex_table = "0123456789abcdef";
+
+	if (!boot_text_mapped)
+		return;
+#ifdef CONFIG_PPC64
+	btext_drawchar(hex_table[(v >> 60) & 0x0000000FUL]);
+	btext_drawchar(hex_table[(v >> 56) & 0x0000000FUL]);
+	btext_drawchar(hex_table[(v >> 52) & 0x0000000FUL]);
+	btext_drawchar(hex_table[(v >> 48) & 0x0000000FUL]);
+	btext_drawchar(hex_table[(v >> 44) & 0x0000000FUL]);
+	btext_drawchar(hex_table[(v >> 40) & 0x0000000FUL]);
+	btext_drawchar(hex_table[(v >> 36) & 0x0000000FUL]);
+	btext_drawchar(hex_table[(v >> 32) & 0x0000000FUL]);
+#endif
+	btext_drawchar(hex_table[(v >> 28) & 0x0000000FUL]);
+	btext_drawchar(hex_table[(v >> 24) & 0x0000000FUL]);
+	btext_drawchar(hex_table[(v >> 20) & 0x0000000FUL]);
+	btext_drawchar(hex_table[(v >> 16) & 0x0000000FUL]);
+	btext_drawchar(hex_table[(v >> 12) & 0x0000000FUL]);
+	btext_drawchar(hex_table[(v >>  8) & 0x0000000FUL]);
+	btext_drawchar(hex_table[(v >>  4) & 0x0000000FUL]);
+	btext_drawchar(hex_table[(v >>  0) & 0x0000000FUL]);
+	btext_drawchar(' ');
+}
+
+static void draw_byte(unsigned char c, long locX, long locY)
+{
+	unsigned char *base	= calc_base(locX << 3, locY << 4);
+	unsigned char *font	= &vga_font[((unsigned int)c) * 16];
+	int rb			= dispDeviceRowBytes;
+
+	switch(dispDeviceDepth) {
+	case 24:
+	case 32:
+		draw_byte_32(font, (unsigned int *)base, rb);
+		break;
+	case 15:
+	case 16:
+		draw_byte_16(font, (unsigned int *)base, rb);
+		break;
+	case 8:
+		draw_byte_8(font, (unsigned int *)base, rb);
+		break;
+	}
+}
+
+static unsigned int expand_bits_8[16] = {
+	0x00000000,
+	0x000000ff,
+	0x0000ff00,
+	0x0000ffff,
+	0x00ff0000,
+	0x00ff00ff,
+	0x00ffff00,
+	0x00ffffff,
+	0xff000000,
+	0xff0000ff,
+	0xff00ff00,
+	0xff00ffff,
+	0xffff0000,
+	0xffff00ff,
+	0xffffff00,
+	0xffffffff
+};
+
+static unsigned int expand_bits_16[4] = {
+	0x00000000,
+	0x0000ffff,
+	0xffff0000,
+	0xffffffff
+};
+
+
+static void draw_byte_32(unsigned char *font, unsigned int *base, int rb)
+{
+	int l, bits;
+	int fg = 0xFFFFFFFFUL;
+	int bg = 0x00000000UL;
+
+	for (l = 0; l < 16; ++l)
+	{
+		bits = *font++;
+		base[0] = (-(bits >> 7) & fg) ^ bg;
+		base[1] = (-((bits >> 6) & 1) & fg) ^ bg;
+		base[2] = (-((bits >> 5) & 1) & fg) ^ bg;
+		base[3] = (-((bits >> 4) & 1) & fg) ^ bg;
+		base[4] = (-((bits >> 3) & 1) & fg) ^ bg;
+		base[5] = (-((bits >> 2) & 1) & fg) ^ bg;
+		base[6] = (-((bits >> 1) & 1) & fg) ^ bg;
+		base[7] = (-(bits & 1) & fg) ^ bg;
+		base = (unsigned int *) ((char *)base + rb);
+	}
+}
+
+static void draw_byte_16(unsigned char *font, unsigned int *base, int rb)
+{
+	int l, bits;
+	int fg = 0xFFFFFFFFUL;
+	int bg = 0x00000000UL;
+	unsigned int *eb = (int *)expand_bits_16;
+
+	for (l = 0; l < 16; ++l)
+	{
+		bits = *font++;
+		base[0] = (eb[bits >> 6] & fg) ^ bg;
+		base[1] = (eb[(bits >> 4) & 3] & fg) ^ bg;
+		base[2] = (eb[(bits >> 2) & 3] & fg) ^ bg;
+		base[3] = (eb[bits & 3] & fg) ^ bg;
+		base = (unsigned int *) ((char *)base + rb);
+	}
+}
+
+static void draw_byte_8(unsigned char *font, unsigned int *base, int rb)
+{
+	int l, bits;
+	int fg = 0x0F0F0F0FUL;
+	int bg = 0x00000000UL;
+	unsigned int *eb = (int *)expand_bits_8;
+
+	for (l = 0; l < 16; ++l)
+	{
+		bits = *font++;
+		base[0] = (eb[bits >> 4] & fg) ^ bg;
+		base[1] = (eb[bits & 0xf] & fg) ^ bg;
+		base = (unsigned int *) ((char *)base + rb);
+	}
+}
+
+static unsigned char vga_font[cmapsz] = {
+0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7e, 0x81, 0xa5, 0x81, 0x81, 0xbd,
+0x99, 0x81, 0x81, 0x7e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7e, 0xff,
+0xdb, 0xff, 0xff, 0xc3, 0xe7, 0xff, 0xff, 0x7e, 0x00, 0x00, 0x00, 0x00,
+0x00, 0x00, 0x00, 0x00, 0x6c, 0xfe, 0xfe, 0xfe, 0xfe, 0x7c, 0x38, 0x10,
+0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x38, 0x7c, 0xfe,
+0x7c, 0x38, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18,
+0x3c, 0x3c, 0xe7, 0xe7, 0xe7, 0x18, 0x18, 0x3c, 0x00, 0x00, 0x00, 0x00,
+0x00, 0x00, 0x00, 0x18, 0x3c, 0x7e, 0xff, 0xff, 0x7e, 0x18, 0x18, 0x3c,
+0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x3c,
+0x3c, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff,
+0xff, 0xff, 0xe7, 0xc3, 0xc3, 0xe7, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+0x00, 0x00, 0x00, 0x00, 0x00, 0x3c, 0x66, 0x42, 0x42, 0x66, 0x3c, 0x00,
+0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc3, 0x99, 0xbd,
+0xbd, 0x99, 0xc3, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x1e, 0x0e,
+0x1a, 0x32, 0x78, 0xcc, 0xcc, 0xcc, 0xcc, 0x78, 0x00, 0x00, 0x00, 0x00,
+0x00, 0x00, 0x3c, 0x66, 0x66, 0x66, 0x66, 0x3c, 0x18, 0x7e, 0x18, 0x18,
+0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x3f, 0x33, 0x3f, 0x30, 0x30, 0x30,
+0x30, 0x70, 0xf0, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7f, 0x63,
+0x7f, 0x63, 0x63, 0x63, 0x63, 0x67, 0xe7, 0xe6, 0xc0, 0x00, 0x00, 0x00,
+0x00, 0x00, 0x00, 0x18, 0x18, 0xdb, 0x3c, 0xe7, 0x3c, 0xdb, 0x18, 0x18,
+0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfe, 0xf8,
+0xf0, 0xe0, 0xc0, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x06, 0x0e,
+0x1e, 0x3e, 0xfe, 0x3e, 0x1e, 0x0e, 0x06, 0x02, 0x00, 0x00, 0x00, 0x00,
+0x00, 0x00, 0x18, 0x3c, 0x7e, 0x18, 0x18, 0x18, 0x7e, 0x3c, 0x18, 0x00,
+0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66,
+0x66, 0x00, 0x66, 0x66, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7f, 0xdb,
+0xdb, 0xdb, 0x7b, 0x1b, 0x1b, 0x1b, 0x1b, 0x1b, 0x00, 0x00, 0x00, 0x00,
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+0x00, 0xd8, 0x6c, 0x6c, 0x6c, 0x6c, 0x6c, 0x00, 0x00, 0x00, 0x00, 0x00,
+0x00, 0x00, 0x00, 0x00, 0x00, 0x70, 0xd8, 0x30, 0x60, 0xc8, 0xf8, 0x00,
+0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+0x7c, 0x7c, 0x7c, 0x7c, 0x7c, 0x7c, 0x7c, 0x00, 0x00, 0x00, 0x00, 0x00,
+0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+0x00, 0x00, 0x00, 0x00,
+};

arch/powerpc/kernel/head.S

@@ -134,11 +134,13 @@ __start:
  * because OF may have I/O devices mapped into that area
  * (particularly on CHRP).
  */
-	mr	r31,r3			/* save parameters */
+	cmpwi	0,r5,0
+	beq	1f
+	bl	prom_init
+	trap
+
+1:	mr	r31,r3			/* save parameters */
 	mr	r30,r4
-	mr	r29,r5
-	mr	r28,r6
-	mr	r27,r7
 	li	r24,0			/* cpu # */
 
 /*
@@ -204,8 +206,7 @@ __after_mmu_off:
  * On CHRP, we are loaded at 0x10000 since OF on CHRP uses
  * the exception vectors at 0 (and therefore this copy
  * overwrites OF's exception vectors with our own).
- * If the MMU is already turned on, we copy stuff to KERNELBASE,
- * otherwise we copy it to 0.
+ * The MMU is off at this point.
  */
 	bl	reloc_offset
 	mr	r26,r3
@@ -1187,9 +1188,6 @@ start_here:
  */
 	mr	r3,r31
 	mr	r4,r30
-	mr	r5,r29
-	mr	r6,r28
-	mr	r7,r27
 	bl	machine_init
 	bl	MMU_init
 

arch/powerpc/kernel/ppc_ksyms.c

@@ -212,36 +212,6 @@ EXPORT_SYMBOL(_machine);
 EXPORT_SYMBOL(sys_ctrler);
 EXPORT_SYMBOL(pmac_newworld);
 #endif
-#ifdef CONFIG_PPC_OF
-EXPORT_SYMBOL(find_devices);
-EXPORT_SYMBOL(find_type_devices);
-EXPORT_SYMBOL(find_compatible_devices);
-EXPORT_SYMBOL(find_path_device);
-EXPORT_SYMBOL(device_is_compatible);
-EXPORT_SYMBOL(machine_is_compatible);
-EXPORT_SYMBOL(find_all_nodes);
-EXPORT_SYMBOL(get_property);
-EXPORT_SYMBOL(request_OF_resource);
-EXPORT_SYMBOL(release_OF_resource);
-EXPORT_SYMBOL(pci_busdev_to_OF_node);
-EXPORT_SYMBOL(pci_device_to_OF_node);
-EXPORT_SYMBOL(pci_device_from_OF_node);
-EXPORT_SYMBOL(of_find_node_by_name);
-EXPORT_SYMBOL(of_find_node_by_type);
-EXPORT_SYMBOL(of_find_compatible_node);
-EXPORT_SYMBOL(of_find_node_by_path);
-EXPORT_SYMBOL(of_find_all_nodes);
-EXPORT_SYMBOL(of_get_parent);
-EXPORT_SYMBOL(of_get_next_child);
-EXPORT_SYMBOL(of_node_get);
-EXPORT_SYMBOL(of_node_put);
-#endif /* CONFIG_PPC_OF */
-#if defined(CONFIG_BOOTX_TEXT)
-EXPORT_SYMBOL(btext_update_display);
-#endif
-#if defined(CONFIG_SCSI) && defined(CONFIG_PPC_PMAC)
-EXPORT_SYMBOL(note_scsi_host);
-#endif
 #ifdef CONFIG_VT
 EXPORT_SYMBOL(kd_mksound);
 #endif

arch/powerpc/kernel/prom.c

@@ -0,0 +1,2141 @@
+/*
+ * Procedures for creating, accessing and interpreting the device tree.
+ *
+ * Paul Mackerras	August 1996.
+ * Copyright (C) 1996-2005 Paul Mackerras.
+ * 
+ *  Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
+ *    {engebret|bergner}@us.ibm.com 
+ *
+ *      This program is free software; you can redistribute it and/or
+ *      modify it under the terms of the GNU General Public License
+ *      as published by the Free Software Foundation; either version
+ *      2 of the License, or (at your option) any later version.
+ */
+
+#undef DEBUG
+
+#include <stdarg.h>
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/init.h>
+#include <linux/threads.h>
+#include <linux/spinlock.h>
+#include <linux/types.h>
+#include <linux/pci.h>
+#include <linux/stringify.h>
+#include <linux/delay.h>
+#include <linux/initrd.h>
+#include <linux/bitops.h>
+#include <linux/module.h>
+
+#include <asm/prom.h>
+#include <asm/rtas.h>
+#include <asm/lmb.h>
+#include <asm/page.h>
+#include <asm/processor.h>
+#include <asm/irq.h>
+#include <asm/io.h>
+#include <asm/smp.h>
+#include <asm/system.h>
+#include <asm/mmu.h>
+#include <asm/pgtable.h>
+#include <asm/pci.h>
+#include <asm/iommu.h>
+#include <asm/btext.h>
+#include <asm/sections.h>
+#include <asm/machdep.h>
+#include <asm/pSeries_reconfig.h>
+
+#ifdef DEBUG
+#define DBG(fmt...) printk(KERN_ERR fmt)
+#else
+#define DBG(fmt...)
+#endif
+
+struct pci_reg_property {
+	struct pci_address addr;
+	u32 size_hi;
+	u32 size_lo;
+};
+
+struct isa_reg_property {
+	u32 space;
+	u32 address;
+	u32 size;
+};
+
+
+typedef int interpret_func(struct device_node *, unsigned long *,
+			   int, int, int);
+
+extern struct rtas_t rtas;
+extern struct lmb lmb;
+extern unsigned long klimit;
+
+static unsigned long memory_limit;
+
+static int __initdata dt_root_addr_cells;
+static int __initdata dt_root_size_cells;
+
+#ifdef CONFIG_PPC64
+static int __initdata iommu_is_off;
+int __initdata iommu_force_on;
+extern unsigned long tce_alloc_start, tce_alloc_end;
+#endif
+
+typedef u32 cell_t;
+
+#if 0
+static struct boot_param_header *initial_boot_params __initdata;
+#else
+struct boot_param_header *initial_boot_params;
+#endif
+
+static struct device_node *allnodes = NULL;
+
+/* use when traversing tree through the allnext, child, sibling,
+ * or parent members of struct device_node.
+ */
+static DEFINE_RWLOCK(devtree_lock);
+
+/* export that to outside world */
+struct device_node *of_chosen;
+
+struct device_node *dflt_interrupt_controller;
+int num_interrupt_controllers;
+
+u32 rtas_data;
+u32 rtas_entry;
+
+/*
+ * Wrapper for allocating memory for various data that needs to be
+ * attached to device nodes as they are processed at boot or when
+ * added to the device tree later (e.g. DLPAR).  At boot there is
+ * already a region reserved so we just increment *mem_start by size;
+ * otherwise we call kmalloc.
+ */
+static void * prom_alloc(unsigned long size, unsigned long *mem_start)
+{
+	unsigned long tmp;
+
+	if (!mem_start)
+		return kmalloc(size, GFP_KERNEL);
+
+	tmp = *mem_start;
+	*mem_start += size;
+	return (void *)tmp;
+}
+
+/*
+ * Find the device_node with a given phandle.
+ */
+static struct device_node * find_phandle(phandle ph)
+{
+	struct device_node *np;
+
+	for (np = allnodes; np != 0; np = np->allnext)
+		if (np->linux_phandle == ph)
+			return np;
+	return NULL;
+}
+
+/*
+ * Find the interrupt parent of a node.
+ */
+static struct device_node * __devinit intr_parent(struct device_node *p)
+{
+	phandle *parp;
+
+	parp = (phandle *) get_property(p, "interrupt-parent", NULL);
+	if (parp == NULL)
+		return p->parent;
+	p = find_phandle(*parp);
+	if (p != NULL)
+		return p;
+	/*
+	 * On a powermac booted with BootX, we don't get to know the
+	 * phandles for any nodes, so find_phandle will return NULL.
+	 * Fortunately these machines only have one interrupt controller
+	 * so there isn't in fact any ambiguity.  -- paulus
+	 */
+	if (num_interrupt_controllers == 1)
+		p = dflt_interrupt_controller;
+	return p;
+}
+
+/*
+ * Find out the size of each entry of the interrupts property
+ * for a node.
+ */
+int __devinit prom_n_intr_cells(struct device_node *np)
+{
+	struct device_node *p;
+	unsigned int *icp;
+
+	for (p = np; (p = intr_parent(p)) != NULL; ) {
+		icp = (unsigned int *)
+			get_property(p, "#interrupt-cells", NULL);
+		if (icp != NULL)
+			return *icp;
+		if (get_property(p, "interrupt-controller", NULL) != NULL
+		    || get_property(p, "interrupt-map", NULL) != NULL) {
+			printk("oops, node %s doesn't have #interrupt-cells\n",
+			       p->full_name);
+			return 1;
+		}
+	}
+#ifdef DEBUG_IRQ
+	printk("prom_n_intr_cells failed for %s\n", np->full_name);
+#endif
+	return 1;
+}
+
+/*
+ * Map an interrupt from a device up to the platform interrupt
+ * descriptor.
+ */
+static int __devinit map_interrupt(unsigned int **irq, struct device_node **ictrler,
+				   struct device_node *np, unsigned int *ints,
+				   int nintrc)
+{
+	struct device_node *p, *ipar;
+	unsigned int *imap, *imask, *ip;
+	int i, imaplen, match;
+	int newintrc = 0, newaddrc = 0;
+	unsigned int *reg;
+	int naddrc;
+
+	reg = (unsigned int *) get_property(np, "reg", NULL);
+	naddrc = prom_n_addr_cells(np);
+	p = intr_parent(np);
+	while (p != NULL) {
+		if (get_property(p, "interrupt-controller", NULL) != NULL)
+			/* this node is an interrupt controller, stop here */
+			break;
+		imap = (unsigned int *)
+			get_property(p, "interrupt-map", &imaplen);
+		if (imap == NULL) {
+			p = intr_parent(p);
+			continue;
+		}
+		imask = (unsigned int *)
+			get_property(p, "interrupt-map-mask", NULL);
+		if (imask == NULL) {
+			printk("oops, %s has interrupt-map but no mask\n",
+			       p->full_name);
+			return 0;
+		}
+		imaplen /= sizeof(unsigned int);
+		match = 0;
+		ipar = NULL;
+		while (imaplen > 0 && !match) {
+			/* check the child-interrupt field */
+			match = 1;
+			for (i = 0; i < naddrc && match; ++i)
+				match = ((reg[i] ^ imap[i]) & imask[i]) == 0;
+			for (; i < naddrc + nintrc && match; ++i)
+				match = ((ints[i-naddrc] ^ imap[i]) & imask[i]) == 0;
+			imap += naddrc + nintrc;
+			imaplen -= naddrc + nintrc;
+			/* grab the interrupt parent */
+			ipar = find_phandle((phandle) *imap++);
+			--imaplen;
+			if (ipar == NULL && num_interrupt_controllers == 1)
+				/* cope with BootX not giving us phandles */
+				ipar = dflt_interrupt_controller;
+			if (ipar == NULL) {
+				printk("oops, no int parent %x in map of %s\n",
+				       imap[-1], p->full_name);
+				return 0;
+			}
+			/* find the parent's # addr and intr cells */
+			ip = (unsigned int *)
+				get_property(ipar, "#interrupt-cells", NULL);
+			if (ip == NULL) {
+				printk("oops, no #interrupt-cells on %s\n",
+				       ipar->full_name);
+				return 0;
+			}
+			newintrc = *ip;
+			ip = (unsigned int *)
+				get_property(ipar, "#address-cells", NULL);
+			newaddrc = (ip == NULL)? 0: *ip;
+			imap += newaddrc + newintrc;
+			imaplen -= newaddrc + newintrc;
+		}
+		if (imaplen < 0) {
+			printk("oops, error decoding int-map on %s, len=%d\n",
+			       p->full_name, imaplen);
+			return 0;
+		}
+		if (!match) {
+#ifdef DEBUG_IRQ
+			printk("oops, no match in %s int-map for %s\n",
+			       p->full_name, np->full_name);
+#endif
+			return 0;
+		}
+		p = ipar;
+		naddrc = newaddrc;
+		nintrc = newintrc;
+		ints = imap - nintrc;
+		reg = ints - naddrc;
+	}
+	if (p == NULL) {
+#ifdef DEBUG_IRQ
+		printk("hmmm, int tree for %s doesn't have ctrler\n",
+		       np->full_name);
+#endif
+		return 0;
+	}
+	*irq = ints;
+	*ictrler = p;
+	return nintrc;
+}
+
+static int __devinit finish_node_interrupts(struct device_node *np,
+					    unsigned long *mem_start,
+					    int measure_only)
+{
+	unsigned int *ints;
+	int intlen, intrcells, intrcount;
+	int i, j, n;
+	unsigned int *irq, virq;
+	struct device_node *ic;
+
+	ints = (unsigned int *) get_property(np, "interrupts", &intlen);
+	if (ints == NULL)
+		return 0;
+	intrcells = prom_n_intr_cells(np);
+	intlen /= intrcells * sizeof(unsigned int);
+
+	np->intrs = prom_alloc(intlen * sizeof(*(np->intrs)), mem_start);
+	if (!np->intrs)
+		return -ENOMEM;
+
+	if (measure_only)
+		return 0;
+
+	intrcount = 0;
+	for (i = 0; i < intlen; ++i, ints += intrcells) {
+		n = map_interrupt(&irq, &ic, np, ints, intrcells);
+		if (n <= 0)
+			continue;
+
+		/* don't map IRQ numbers under a cascaded 8259 controller */
+		if (ic && device_is_compatible(ic, "chrp,iic")) {
+			np->intrs[intrcount].line = irq[0];
+		} else {
+#ifdef CONFIG_PPC64
+			virq = virt_irq_create_mapping(irq[0]);
+			if (virq == NO_IRQ) {
+				printk(KERN_CRIT "Could not allocate interrupt"
+				       " number for %s\n", np->full_name);
+				continue;
+			}
+			virq = irq_offset_up(virq);
+#else
+			virq = irq[0];
+#endif
+			np->intrs[intrcount].line = virq;
+		}
+
+#ifdef CONFIG_PPC64
+		/* We offset irq numbers for the u3 MPIC by 128 in PowerMac */
+		if (systemcfg->platform == PLATFORM_POWERMAC && ic && ic->parent) {
+			char *name = get_property(ic->parent, "name", NULL);
+			if (name && !strcmp(name, "u3"))
+				np->intrs[intrcount].line += 128;
+			else if (!(name && !strcmp(name, "mac-io")))
+				/* ignore other cascaded controllers, such as
+				   the k2-sata-root */
+				break;
+		}
+#endif
+		np->intrs[intrcount].sense = 1;
+		if (n > 1)
+			np->intrs[intrcount].sense = irq[1];
+		if (n > 2) {
+			printk("hmmm, got %d intr cells for %s:", n,
+			       np->full_name);
+			for (j = 0; j < n; ++j)
+				printk(" %d", irq[j]);
+			printk("\n");
+		}
+		++intrcount;
+	}
+	np->n_intrs = intrcount;
+
+	return 0;
+}
+
+static int __devinit interpret_pci_props(struct device_node *np,
+					 unsigned long *mem_start,
+					 int naddrc, int nsizec,
+					 int measure_only)
+{
+	struct address_range *adr;
+	struct pci_reg_property *pci_addrs;
+	int i, l, n_addrs;
+
+	pci_addrs = (struct pci_reg_property *)
+		get_property(np, "assigned-addresses", &l);
+	if (!pci_addrs)
+		return 0;
+
+	n_addrs = l / sizeof(*pci_addrs);
+
+	adr = prom_alloc(n_addrs * sizeof(*adr), mem_start);
+	if (!adr)
+		return -ENOMEM;
+
+ 	if (measure_only)
+ 		return 0;
+
+ 	np->addrs = adr;
+ 	np->n_addrs = n_addrs;
+
+ 	for (i = 0; i < n_addrs; i++) {
+ 		adr[i].space = pci_addrs[i].addr.a_hi;
+ 		adr[i].address = pci_addrs[i].addr.a_lo |
+			((u64)pci_addrs[i].addr.a_mid << 32);
+ 		adr[i].size = pci_addrs[i].size_lo;
+	}
+
+	return 0;
+}
+
+static int __init interpret_dbdma_props(struct device_node *np,
+					unsigned long *mem_start,
+					int naddrc, int nsizec,
+					int measure_only)
+{
+	struct reg_property32 *rp;
+	struct address_range *adr;
+	unsigned long base_address;
+	int i, l;
+	struct device_node *db;
+
+	base_address = 0;
+	if (!measure_only) {
+		for (db = np->parent; db != NULL; db = db->parent) {
+			if (!strcmp(db->type, "dbdma") && db->n_addrs != 0) {
+				base_address = db->addrs[0].address;
+				break;
+			}
+		}
+	}
+
+	rp = (struct reg_property32 *) get_property(np, "reg", &l);
+	if (rp != 0 && l >= sizeof(struct reg_property32)) {
+		i = 0;
+		adr = (struct address_range *) (*mem_start);
+		while ((l -= sizeof(struct reg_property32)) >= 0) {
+			if (!measure_only) {
+				adr[i].space = 2;
+				adr[i].address = rp[i].address + base_address;
+				adr[i].size = rp[i].size;
+			}
+			++i;
+		}
+		np->addrs = adr;
+		np->n_addrs = i;
+		(*mem_start) += i * sizeof(struct address_range);
+	}
+
+	return 0;
+}
+
+static int __init interpret_macio_props(struct device_node *np,
+					unsigned long *mem_start,
+					int naddrc, int nsizec,
+					int measure_only)
+{
+	struct reg_property32 *rp;
+	struct address_range *adr;
+	unsigned long base_address;
+	int i, l;
+	struct device_node *db;
+
+	base_address = 0;
+	if (!measure_only) {
+		for (db = np->parent; db != NULL; db = db->parent) {
+			if (!strcmp(db->type, "mac-io") && db->n_addrs != 0) {
+				base_address = db->addrs[0].address;
+				break;
+			}
+		}
+	}
+
+	rp = (struct reg_property32 *) get_property(np, "reg", &l);
+	if (rp != 0 && l >= sizeof(struct reg_property32)) {
+		i = 0;
+		adr = (struct address_range *) (*mem_start);
+		while ((l -= sizeof(struct reg_property32)) >= 0) {
+			if (!measure_only) {
+				adr[i].space = 2;
+				adr[i].address = rp[i].address + base_address;
+				adr[i].size = rp[i].size;
+			}
+			++i;
+		}
+		np->addrs = adr;
+		np->n_addrs = i;
+		(*mem_start) += i * sizeof(struct address_range);
+	}
+
+	return 0;
+}
+
+static int __init interpret_isa_props(struct device_node *np,
+				      unsigned long *mem_start,
+				      int naddrc, int nsizec,
+				      int measure_only)
+{
+	struct isa_reg_property *rp;
+	struct address_range *adr;
+	int i, l;
+
+	rp = (struct isa_reg_property *) get_property(np, "reg", &l);
+	if (rp != 0 && l >= sizeof(struct isa_reg_property)) {
+		i = 0;
+		adr = (struct address_range *) (*mem_start);
+		while ((l -= sizeof(struct isa_reg_property)) >= 0) {
+			if (!measure_only) {
+				adr[i].space = rp[i].space;
+				adr[i].address = rp[i].address;
+				adr[i].size = rp[i].size;
+			}
+			++i;
+		}
+		np->addrs = adr;
+		np->n_addrs = i;
+		(*mem_start) += i * sizeof(struct address_range);
+	}
+
+	return 0;
+}
+
+static int __init interpret_root_props(struct device_node *np,
+				       unsigned long *mem_start,
+				       int naddrc, int nsizec,
+				       int measure_only)
+{
+	struct address_range *adr;
+	int i, l;
+	unsigned int *rp;
+	int rpsize = (naddrc + nsizec) * sizeof(unsigned int);
+
+	rp = (unsigned int *) get_property(np, "reg", &l);
+	if (rp != 0 && l >= rpsize) {
+		i = 0;
+		adr = (struct address_range *) (*mem_start);
+		while ((l -= rpsize) >= 0) {
+			if (!measure_only) {
+				adr[i].space = 0;
+				adr[i].address = rp[naddrc - 1];
+				adr[i].size = rp[naddrc + nsizec - 1];
+			}
+			++i;
+			rp += naddrc + nsizec;
+		}
+		np->addrs = adr;
+		np->n_addrs = i;
+		(*mem_start) += i * sizeof(struct address_range);
+	}
+
+	return 0;
+}
+
+static int __devinit finish_node(struct device_node *np,
+				 unsigned long *mem_start,
+				 interpret_func *ifunc,
+				 int naddrc, int nsizec,
+				 int measure_only)
+{
+	struct device_node *child;
+	int *ip, rc = 0;
+
+	/* get the device addresses and interrupts */
+	if (ifunc != NULL)
+		rc = ifunc(np, mem_start, naddrc, nsizec, measure_only);
+	if (rc)
+		goto out;
+
+	rc = finish_node_interrupts(np, mem_start, measure_only);
+	if (rc)
+		goto out;
+
+	/* Look for #address-cells and #size-cells properties. */
+	ip = (int *) get_property(np, "#address-cells", NULL);
+	if (ip != NULL)
+		naddrc = *ip;
+	ip = (int *) get_property(np, "#size-cells", NULL);
+	if (ip != NULL)
+		nsizec = *ip;
+
+	if (!strcmp(np->name, "device-tree") || np->parent == NULL)
+		ifunc = interpret_root_props;
+	else if (np->type == 0)
+		ifunc = NULL;
+	else if (!strcmp(np->type, "pci") || !strcmp(np->type, "vci"))
+		ifunc = interpret_pci_props;
+	else if (!strcmp(np->type, "dbdma"))
+		ifunc = interpret_dbdma_props;
+	else if (!strcmp(np->type, "mac-io") || ifunc == interpret_macio_props)
+		ifunc = interpret_macio_props;
+	else if (!strcmp(np->type, "isa"))
+		ifunc = interpret_isa_props;
+	else if (!strcmp(np->name, "uni-n") || !strcmp(np->name, "u3"))
+		ifunc = interpret_root_props;
+	else if (!((ifunc == interpret_dbdma_props
+		    || ifunc == interpret_macio_props)
+		   && (!strcmp(np->type, "escc")
+		       || !strcmp(np->type, "media-bay"))))
+		ifunc = NULL;
+
+	for (child = np->child; child != NULL; child = child->sibling) {
+		rc = finish_node(child, mem_start, ifunc,
+				 naddrc, nsizec, measure_only);
+		if (rc)
+			goto out;
+	}
+out:
+	return rc;
+}
+
+static void __init scan_interrupt_controllers(void)
+{
+	struct device_node *np;
+	int n = 0;
+	char *name, *ic;
+	int iclen;
+
+	for (np = allnodes; np != NULL; np = np->allnext) {
+		ic = get_property(np, "interrupt-controller", &iclen);
+		name = get_property(np, "name", NULL);
+		/* checking iclen makes sure we don't get a false
+		   match on /chosen.interrupt_controller */
+		if ((name != NULL
+		     && strcmp(name, "interrupt-controller") == 0)
+		    || (ic != NULL && iclen == 0
+			&& strcmp(name, "AppleKiwi"))) {
+			if (n == 0)
+				dflt_interrupt_controller = np;
+			++n;
+		}
+	}
+	num_interrupt_controllers = n;
+}
+
+/**
+ * finish_device_tree is called once things are running normally
+ * (i.e. with text and data mapped to the address they were linked at).
+ * It traverses the device tree and fills in some of the additional,
+ * fields in each node like {n_}addrs and {n_}intrs, the virt interrupt
+ * mapping is also initialized at this point.
+ */
+void __init finish_device_tree(void)
+{
+	unsigned long start, end, size = 0;
+
+	DBG(" -> finish_device_tree\n");
+
+#ifdef CONFIG_PPC64
+	/* Initialize virtual IRQ map */
+	virt_irq_init();
+#endif
+	scan_interrupt_controllers();
+
+	/*
+	 * Finish device-tree (pre-parsing some properties etc...)
+	 * We do this in 2 passes. One with "measure_only" set, which
+	 * will only measure the amount of memory needed, then we can
+	 * allocate that memory, and call finish_node again. However,
+	 * we must be careful as most routines will fail nowadays when
+	 * prom_alloc() returns 0, so we must make sure our first pass
+	 * doesn't start at 0. We pre-initialize size to 16 for that
+	 * reason and then remove those additional 16 bytes
+	 */
+	size = 16;
+	finish_node(allnodes, &size, NULL, 0, 0, 1);
+	size -= 16;
+	end = start = (unsigned long) __va(lmb_alloc(size, 128));
+	finish_node(allnodes, &end, NULL, 0, 0, 0);
+	BUG_ON(end != start + size);
+
+	DBG(" <- finish_device_tree\n");
+}
+
+static inline char *find_flat_dt_string(u32 offset)
+{
+	return ((char *)initial_boot_params) +
+		initial_boot_params->off_dt_strings + offset;
+}
+
+/**
+ * This function is used to scan the flattened device-tree, it is
+ * used to extract the memory informations at boot before we can
+ * unflatten the tree
+ */
+static int __init scan_flat_dt(int (*it)(unsigned long node,
+					 const char *uname, int depth,
+					 void *data),
+			       void *data)
+{
+	unsigned long p = ((unsigned long)initial_boot_params) +
+		initial_boot_params->off_dt_struct;
+	int rc = 0;
+	int depth = -1;
+
+	do {
+		u32 tag = *((u32 *)p);
+		char *pathp;
+		
+		p += 4;
+		if (tag == OF_DT_END_NODE) {
+			depth --;
+			continue;
+		}
+		if (tag == OF_DT_NOP)
+			continue;
+		if (tag == OF_DT_END)
+			break;
+		if (tag == OF_DT_PROP) {
+			u32 sz = *((u32 *)p);
+			p += 8;
+			if (initial_boot_params->version < 0x10)
+				p = _ALIGN(p, sz >= 8 ? 8 : 4);
+			p += sz;
+			p = _ALIGN(p, 4);
+			continue;
+		}
+		if (tag != OF_DT_BEGIN_NODE) {
+			printk(KERN_WARNING "Invalid tag %x scanning flattened"
+			       " device tree !\n", tag);
+			return -EINVAL;
+		}
+		depth++;
+		pathp = (char *)p;
+		p = _ALIGN(p + strlen(pathp) + 1, 4);
+		if ((*pathp) == '/') {
+			char *lp, *np;
+			for (lp = NULL, np = pathp; *np; np++)
+				if ((*np) == '/')
+					lp = np+1;
+			if (lp != NULL)
+				pathp = lp;
+		}
+		rc = it(p, pathp, depth, data);
+		if (rc != 0)
+			break;		
+	} while(1);
+
+	return rc;
+}
+
+/**
+ * This  function can be used within scan_flattened_dt callback to get
+ * access to properties
+ */
+static void* __init get_flat_dt_prop(unsigned long node, const char *name,
+				     unsigned long *size)
+{
+	unsigned long p = node;
+
+	do {
+		u32 tag = *((u32 *)p);
+		u32 sz, noff;
+		const char *nstr;
+
+		p += 4;
+		if (tag == OF_DT_NOP)
+			continue;
+		if (tag != OF_DT_PROP)
+			return NULL;
+
+		sz = *((u32 *)p);
+		noff = *((u32 *)(p + 4));
+		p += 8;
+		if (initial_boot_params->version < 0x10)
+			p = _ALIGN(p, sz >= 8 ? 8 : 4);
+
+		nstr = find_flat_dt_string(noff);
+		if (nstr == NULL) {
+			printk(KERN_WARNING "Can't find property index"
+			       " name !\n");
+			return NULL;
+		}
+		if (strcmp(name, nstr) == 0) {
+			if (size)
+				*size = sz;
+			return (void *)p;
+		}
+		p += sz;
+		p = _ALIGN(p, 4);
+	} while(1);
+}
+
+static void *__init unflatten_dt_alloc(unsigned long *mem, unsigned long size,
+				       unsigned long align)
+{
+	void *res;
+
+	*mem = _ALIGN(*mem, align);
+	res = (void *)*mem;
+	*mem += size;
+
+	return res;
+}
+
+static unsigned long __init unflatten_dt_node(unsigned long mem,
+					      unsigned long *p,
+					      struct device_node *dad,
+					      struct device_node ***allnextpp,
+					      unsigned long fpsize)
+{
+	struct device_node *np;
+	struct property *pp, **prev_pp = NULL;
+	char *pathp;
+	u32 tag;
+	unsigned int l, allocl;
+	int has_name = 0;
+	int new_format = 0;
+
+	tag = *((u32 *)(*p));
+	if (tag != OF_DT_BEGIN_NODE) {
+		printk("Weird tag at start of node: %x\n", tag);
+		return mem;
+	}
+	*p += 4;
+	pathp = (char *)*p;
+	l = allocl = strlen(pathp) + 1;
+	*p = _ALIGN(*p + l, 4);
+
+	/* version 0x10 has a more compact unit name here instead of the full
+	 * path. we accumulate the full path size using "fpsize", we'll rebuild
+	 * it later. We detect this because the first character of the name is
+	 * not '/'.
+	 */
+	if ((*pathp) != '/') {
+		new_format = 1;
+		if (fpsize == 0) {
+			/* root node: special case. fpsize accounts for path
+			 * plus terminating zero. root node only has '/', so
+			 * fpsize should be 2, but we want to avoid the first
+			 * level nodes to have two '/' so we use fpsize 1 here
+			 */
+			fpsize = 1;
+			allocl = 2;
+		} else {
+			/* account for '/' and path size minus terminal 0
+			 * already in 'l'
+			 */
+			fpsize += l;
+			allocl = fpsize;
+		}
+	}
+
+
+	np = unflatten_dt_alloc(&mem, sizeof(struct device_node) + allocl,
+				__alignof__(struct device_node));
+	if (allnextpp) {
+		memset(np, 0, sizeof(*np));
+		np->full_name = ((char*)np) + sizeof(struct device_node);
+		if (new_format) {
+			char *p = np->full_name;
+			/* rebuild full path for new format */
+			if (dad && dad->parent) {
+				strcpy(p, dad->full_name);
+#ifdef DEBUG
+				if ((strlen(p) + l + 1) != allocl) {
+					DBG("%s: p: %d, l: %d, a: %d\n",
+					    pathp, strlen(p), l, allocl);
+				}
+#endif
+				p += strlen(p);
+			}
+			*(p++) = '/';
+			memcpy(p, pathp, l);
+		} else
+			memcpy(np->full_name, pathp, l);
+		prev_pp = &np->properties;
+		**allnextpp = np;
+		*allnextpp = &np->allnext;
+		if (dad != NULL) {
+			np->parent = dad;
+			/* we temporarily use the next field as `last_child'*/
+			if (dad->next == 0)
+				dad->child = np;
+			else
+				dad->next->sibling = np;
+			dad->next = np;
+		}
+		kref_init(&np->kref);
+	}
+	while(1) {
+		u32 sz, noff;
+		char *pname;
+
+		tag = *((u32 *)(*p));
+		if (tag == OF_DT_NOP) {
+			*p += 4;
+			continue;
+		}
+		if (tag != OF_DT_PROP)
+			break;
+		*p += 4;
+		sz = *((u32 *)(*p));
+		noff = *((u32 *)((*p) + 4));
+		*p += 8;
+		if (initial_boot_params->version < 0x10)
+			*p = _ALIGN(*p, sz >= 8 ? 8 : 4);
+
+		pname = find_flat_dt_string(noff);
+		if (pname == NULL) {
+			printk("Can't find property name in list !\n");
+			break;
+		}
+		if (strcmp(pname, "name") == 0)
+			has_name = 1;
+		l = strlen(pname) + 1;
+		pp = unflatten_dt_alloc(&mem, sizeof(struct property),
+					__alignof__(struct property));
+		if (allnextpp) {
+			if (strcmp(pname, "linux,phandle") == 0) {
+				np->node = *((u32 *)*p);
+				if (np->linux_phandle == 0)
+					np->linux_phandle = np->node;
+			}
+			if (strcmp(pname, "ibm,phandle") == 0)
+				np->linux_phandle = *((u32 *)*p);
+			pp->name = pname;
+			pp->length = sz;
+			pp->value = (void *)*p;
+			*prev_pp = pp;
+			prev_pp = &pp->next;
+		}
+		*p = _ALIGN((*p) + sz, 4);
+	}
+	/* with version 0x10 we may not have the name property, recreate
+	 * it here from the unit name if absent
+	 */
+	if (!has_name) {
+		char *p = pathp, *ps = pathp, *pa = NULL;
+		int sz;
+
+		while (*p) {
+			if ((*p) == '@')
+				pa = p;
+			if ((*p) == '/')
+				ps = p + 1;
+			p++;
+		}
+		if (pa < ps)
+			pa = p;
+		sz = (pa - ps) + 1;
+		pp = unflatten_dt_alloc(&mem, sizeof(struct property) + sz,
+					__alignof__(struct property));
+		if (allnextpp) {
+			pp->name = "name";
+			pp->length = sz;
+			pp->value = (unsigned char *)(pp + 1);
+			*prev_pp = pp;
+			prev_pp = &pp->next;
+			memcpy(pp->value, ps, sz - 1);
+			((char *)pp->value)[sz - 1] = 0;
+			DBG("fixed up name for %s -> %s\n", pathp, pp->value);
+		}
+	}
+	if (allnextpp) {
+		*prev_pp = NULL;
+		np->name = get_property(np, "name", NULL);
+		np->type = get_property(np, "device_type", NULL);
+
+		if (!np->name)
+			np->name = "<NULL>";
+		if (!np->type)
+			np->type = "<NULL>";
+	}
+	while (tag == OF_DT_BEGIN_NODE) {
+		mem = unflatten_dt_node(mem, p, np, allnextpp, fpsize);
+		tag = *((u32 *)(*p));
+	}
+	if (tag != OF_DT_END_NODE) {
+		printk("Weird tag at end of node: %x\n", tag);
+		return mem;
+	}
+	*p += 4;
+	return mem;
+}
+
+
+/**
+ * unflattens the device-tree passed by the firmware, creating the
+ * tree of struct device_node. It also fills the "name" and "type"
+ * pointers of the nodes so the normal device-tree walking functions
+ * can be used (this used to be done by finish_device_tree)
+ */
+void __init unflatten_device_tree(void)
+{
+	unsigned long start, mem, size;
+	struct device_node **allnextp = &allnodes;
+	char *p = NULL;
+	int l = 0;
+
+	DBG(" -> unflatten_device_tree()\n");
+
+	/* First pass, scan for size */
+	start = ((unsigned long)initial_boot_params) +
+		initial_boot_params->off_dt_struct;
+	size = unflatten_dt_node(0, &start, NULL, NULL, 0);
+	size = (size | 3) + 1;
+
+	DBG("  size is %lx, allocating...\n", size);
+
+	/* Allocate memory for the expanded device tree */
+	mem = lmb_alloc(size + 4, __alignof__(struct device_node));
+	if (!mem) {
+		DBG("Couldn't allocate memory with lmb_alloc()!\n");
+		panic("Couldn't allocate memory with lmb_alloc()!\n");
+	}
+	mem = (unsigned long) __va(mem);
+
+	((u32 *)mem)[size / 4] = 0xdeadbeef;
+
+	DBG("  unflattening %lx...\n", mem);
+
+	/* Second pass, do actual unflattening */
+	start = ((unsigned long)initial_boot_params) +
+		initial_boot_params->off_dt_struct;
+	unflatten_dt_node(mem, &start, NULL, &allnextp, 0);
+	if (*((u32 *)start) != OF_DT_END)
+		printk(KERN_WARNING "Weird tag at end of tree: %08x\n", *((u32 *)start));
+	if (((u32 *)mem)[size / 4] != 0xdeadbeef)
+		printk(KERN_WARNING "End of tree marker overwritten: %08x\n",
+		       ((u32 *)mem)[size / 4] );
+	*allnextp = NULL;
+
+	/* Get pointer to OF "/chosen" node for use everywhere */
+	of_chosen = of_find_node_by_path("/chosen");
+
+	/* Retreive command line */
+	if (of_chosen != NULL) {
+		p = (char *)get_property(of_chosen, "bootargs", &l);
+		if (p != NULL && l > 0)
+			strlcpy(cmd_line, p, min(l, COMMAND_LINE_SIZE));
+	}
+#ifdef CONFIG_CMDLINE
+	if (l == 0 || (l == 1 && (*p) == 0))
+		strlcpy(cmd_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
+#endif /* CONFIG_CMDLINE */
+
+	DBG("Command line is: %s\n", cmd_line);
+
+	DBG(" <- unflatten_device_tree()\n");
+}
+
+
+static int __init early_init_dt_scan_cpus(unsigned long node,
+					  const char *uname, int depth, void *data)
+{
+	char *type = get_flat_dt_prop(node, "device_type", NULL);
+	u32 *prop;
+	unsigned long size = 0;
+
+	/* We are scanning "cpu" nodes only */
+	if (type == NULL || strcmp(type, "cpu") != 0)
+		return 0;
+
+#ifdef CONFIG_PPC_PSERIES
+	/* On LPAR, look for the first ibm,pft-size property for the  hash table size
+	 */
+	if (systemcfg->platform == PLATFORM_PSERIES_LPAR && ppc64_pft_size == 0) {
+		u32 *pft_size;
+		pft_size = get_flat_dt_prop(node, "ibm,pft-size", NULL);
+		if (pft_size != NULL) {
+			/* pft_size[0] is the NUMA CEC cookie */
+			ppc64_pft_size = pft_size[1];
+		}
+	}
+#endif
+
+#ifdef CONFIG_PPC64
+	if (initial_boot_params && initial_boot_params->version >= 2) {
+		/* version 2 of the kexec param format adds the phys cpuid
+		 * of booted proc.
+		 */
+		boot_cpuid_phys = initial_boot_params->boot_cpuid_phys;
+		boot_cpuid = 0;
+	} else {
+		/* Check if it's the boot-cpu, set it's hw index in paca now */
+		if (get_flat_dt_prop(node, "linux,boot-cpu", NULL) != NULL) {
+			u32 *prop = get_flat_dt_prop(node, "reg", NULL);
+			set_hard_smp_processor_id(0, prop == NULL ? 0 : *prop);
+			boot_cpuid_phys = get_hard_smp_processor_id(0);
+		}
+	}
+#endif
+
+#ifdef CONFIG_ALTIVEC
+	/* Check if we have a VMX and eventually update CPU features */
+	prop = (u32 *)get_flat_dt_prop(node, "ibm,vmx", &size);
+	if (prop && (*prop) > 0) {
+		cur_cpu_spec->cpu_features |= CPU_FTR_ALTIVEC;
+		cur_cpu_spec->cpu_user_features |= PPC_FEATURE_HAS_ALTIVEC;
+	}
+
+	/* Same goes for Apple's "altivec" property */
+	prop = (u32 *)get_flat_dt_prop(node, "altivec", NULL);
+	if (prop) {
+		cur_cpu_spec->cpu_features |= CPU_FTR_ALTIVEC;
+		cur_cpu_spec->cpu_user_features |= PPC_FEATURE_HAS_ALTIVEC;
+	}
+#endif /* CONFIG_ALTIVEC */
+
+#ifdef CONFIG_PPC_PSERIES
+	/*
+	 * Check for an SMT capable CPU and set the CPU feature. We do
+	 * this by looking at the size of the ibm,ppc-interrupt-server#s
+	 * property
+	 */
+	prop = (u32 *)get_flat_dt_prop(node, "ibm,ppc-interrupt-server#s",
+				       &size);
+	cur_cpu_spec->cpu_features &= ~CPU_FTR_SMT;
+	if (prop && ((size / sizeof(u32)) > 1))
+		cur_cpu_spec->cpu_features |= CPU_FTR_SMT;
+#endif
+
+	return 0;
+}
+
+static int __init early_init_dt_scan_chosen(unsigned long node,
+					    const char *uname, int depth, void *data)
+{
+	u32 *prop;
+	unsigned long *lprop;
+
+	DBG("search \"chosen\", depth: %d, uname: %s\n", depth, uname);
+
+	if (depth != 1 || strcmp(uname, "chosen") != 0)
+		return 0;
+
+	/* get platform type */
+	prop = (u32 *)get_flat_dt_prop(node, "linux,platform", NULL);
+	if (prop == NULL)
+		return 0;
+#ifdef CONFIG_PPC64
+	systemcfg->platform = *prop;
+#else
+	_machine = *prop;
+#endif
+
+#ifdef CONFIG_PPC64
+	/* check if iommu is forced on or off */
+	if (get_flat_dt_prop(node, "linux,iommu-off", NULL) != NULL)
+		iommu_is_off = 1;
+	if (get_flat_dt_prop(node, "linux,iommu-force-on", NULL) != NULL)
+		iommu_force_on = 1;
+#endif
+
+ 	lprop = get_flat_dt_prop(node, "linux,memory-limit", NULL);
+ 	if (lprop)
+ 		memory_limit = *lprop;
+
+#ifdef CONFIG_PPC64
+ 	lprop = get_flat_dt_prop(node, "linux,tce-alloc-start", NULL);
+ 	if (lprop)
+ 		tce_alloc_start = *lprop;
+ 	lprop = get_flat_dt_prop(node, "linux,tce-alloc-end", NULL);
+ 	if (lprop)
+ 		tce_alloc_end = *lprop;
+#endif
+
+#ifdef CONFIG_PPC_RTAS
+	/* To help early debugging via the front panel, we retreive a minimal
+	 * set of RTAS infos now if available
+	 */
+	{
+		u64 *basep, *entryp;
+
+		basep = get_flat_dt_prop(node, "linux,rtas-base", NULL);
+		entryp = get_flat_dt_prop(node, "linux,rtas-entry", NULL);
+		prop = get_flat_dt_prop(node, "linux,rtas-size", NULL);
+		if (basep && entryp && prop) {
+			rtas.base = *basep;
+			rtas.entry = *entryp;
+			rtas.size = *prop;
+		}
+	}
+#endif /* CONFIG_PPC_RTAS */
+
+	/* break now */
+	return 1;
+}
+
+static int __init early_init_dt_scan_root(unsigned long node,
+					  const char *uname, int depth, void *data)
+{
+	u32 *prop;
+
+	if (depth != 0)
+		return 0;
+
+	prop = get_flat_dt_prop(node, "#size-cells", NULL);
+	dt_root_size_cells = (prop == NULL) ? 1 : *prop;
+	DBG("dt_root_size_cells = %x\n", dt_root_size_cells);
+
+	prop = get_flat_dt_prop(node, "#address-cells", NULL);
+	dt_root_addr_cells = (prop == NULL) ? 2 : *prop;
+	DBG("dt_root_addr_cells = %x\n", dt_root_addr_cells);
+	
+	/* break now */
+	return 1;
+}
+
+static unsigned long __init dt_mem_next_cell(int s, cell_t **cellp)
+{
+	cell_t *p = *cellp;
+	unsigned long r;
+
+	/* Ignore more than 2 cells */
+	while (s > sizeof(unsigned long) / 4) {
+		p++;
+		s--;
+	}
+	r = *p++;
+#ifdef CONFIG_PPC64
+	if (s > 1) {
+		r <<= 32;
+		r |= *(p++);
+		s--;
+	}
+#endif
+
+	*cellp = p;
+	return r;
+}
+
+
+static int __init early_init_dt_scan_memory(unsigned long node,
+					    const char *uname, int depth, void *data)
+{
+	char *type = get_flat_dt_prop(node, "device_type", NULL);
+	cell_t *reg, *endp;
+	unsigned long l;
+
+	/* We are scanning "memory" nodes only */
+	if (type == NULL || strcmp(type, "memory") != 0)
+		return 0;
+
+	reg = (cell_t *)get_flat_dt_prop(node, "reg", &l);
+	if (reg == NULL)
+		return 0;
+
+	endp = reg + (l / sizeof(cell_t));
+
+	DBG("memory scan node %s ..., reg size %ld, data: %x %x %x %x, ...\n",
+	    uname, l, reg[0], reg[1], reg[2], reg[3]);
+
+	while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) {
+		unsigned long base, size;
+
+		base = dt_mem_next_cell(dt_root_addr_cells, &reg);
+		size = dt_mem_next_cell(dt_root_size_cells, &reg);
+
+		if (size == 0)
+			continue;
+		DBG(" - %lx ,  %lx\n", base, size);
+#ifdef CONFIG_PPC64
+		if (iommu_is_off) {
+			if (base >= 0x80000000ul)
+				continue;
+			if ((base + size) > 0x80000000ul)
+				size = 0x80000000ul - base;
+		}
+#endif
+		lmb_add(base, size);
+	}
+	return 0;
+}
+
+static void __init early_reserve_mem(void)
+{
+	unsigned long base, size;
+	unsigned long *reserve_map;
+
+	reserve_map = (unsigned long *)(((unsigned long)initial_boot_params) +
+					initial_boot_params->off_mem_rsvmap);
+	while (1) {
+		base = *(reserve_map++);
+		size = *(reserve_map++);
+		if (size == 0)
+			break;
+		DBG("reserving: %lx -> %lx\n", base, size);
+		lmb_reserve(base, size);
+	}
+
+#if 0
+	DBG("memory reserved, lmbs :\n");
+      	lmb_dump_all();
+#endif
+}
+
+void __init early_init_devtree(void *params)
+{
+	DBG(" -> early_init_devtree()\n");
+
+	/* Setup flat device-tree pointer */
+	initial_boot_params = params;
+
+	/* Retrieve various informations from the /chosen node of the
+	 * device-tree, including the platform type, initrd location and
+	 * size, TCE reserve, and more ...
+	 */
+	scan_flat_dt(early_init_dt_scan_chosen, NULL);
+
+	/* Scan memory nodes and rebuild LMBs */
+	lmb_init();
+	scan_flat_dt(early_init_dt_scan_root, NULL);
+	scan_flat_dt(early_init_dt_scan_memory, NULL);
+	lmb_enforce_memory_limit(memory_limit);
+	lmb_analyze();
+#ifdef CONFIG_PPC64
+	systemcfg->physicalMemorySize = lmb_phys_mem_size();
+#endif
+	lmb_reserve(0, __pa(klimit));
+
+	DBG("Phys. mem: %lx\n", lmb_phys_mem_size());
+
+	/* Reserve LMB regions used by kernel, initrd, dt, etc... */
+	early_reserve_mem();
+
+	DBG("Scanning CPUs ...\n");
+
+	/* Retreive hash table size from flattened tree plus other
+	 * CPU related informations (altivec support, boot CPU ID, ...)
+	 */
+	scan_flat_dt(early_init_dt_scan_cpus, NULL);
+
+#ifdef CONFIG_PPC_PSERIES
+	/* If hash size wasn't obtained above, we calculate it now based on
+	 * the total RAM size
+	 */
+	if (ppc64_pft_size == 0) {
+		unsigned long rnd_mem_size, pteg_count;
+
+		/* round mem_size up to next power of 2 */
+		rnd_mem_size = 1UL << __ilog2(systemcfg->physicalMemorySize);
+		if (rnd_mem_size < systemcfg->physicalMemorySize)
+			rnd_mem_size <<= 1;
+
+		/* # pages / 2 */
+		pteg_count = max(rnd_mem_size >> (12 + 1), 1UL << 11);
+
+		ppc64_pft_size = __ilog2(pteg_count << 7);
+	}
+
+	DBG("Hash pftSize: %x\n", (int)ppc64_pft_size);
+#endif
+	DBG(" <- early_init_devtree()\n");
+}
+
+#undef printk
+
+int
+prom_n_addr_cells(struct device_node* np)
+{
+	int* ip;
+	do {
+		if (np->parent)
+			np = np->parent;
+		ip = (int *) get_property(np, "#address-cells", NULL);
+		if (ip != NULL)
+			return *ip;
+	} while (np->parent);
+	/* No #address-cells property for the root node, default to 1 */
+	return 1;
+}
+
+int
+prom_n_size_cells(struct device_node* np)
+{
+	int* ip;
+	do {
+		if (np->parent)
+			np = np->parent;
+		ip = (int *) get_property(np, "#size-cells", NULL);
+		if (ip != NULL)
+			return *ip;
+	} while (np->parent);
+	/* No #size-cells property for the root node, default to 1 */
+	return 1;
+}
+
+/**
+ * Work out the sense (active-low level / active-high edge)
+ * of each interrupt from the device tree.
+ */
+void __init prom_get_irq_senses(unsigned char *senses, int off, int max)
+{
+	struct device_node *np;
+	int i, j;
+
+	/* default to level-triggered */
+	memset(senses, 1, max - off);
+
+	for (np = allnodes; np != 0; np = np->allnext) {
+		for (j = 0; j < np->n_intrs; j++) {
+			i = np->intrs[j].line;
+			if (i >= off && i < max)
+				senses[i-off] = np->intrs[j].sense ?
+					IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE :
+					IRQ_SENSE_EDGE | IRQ_POLARITY_POSITIVE;
+		}
+	}
+}
+
+/**
+ * Construct and return a list of the device_nodes with a given name.
+ */
+struct device_node *find_devices(const char *name)
+{
+	struct device_node *head, **prevp, *np;
+
+	prevp = &head;
+	for (np = allnodes; np != 0; np = np->allnext) {
+		if (np->name != 0 && strcasecmp(np->name, name) == 0) {
+			*prevp = np;
+			prevp = &np->next;
+		}
+	}
+	*prevp = NULL;
+	return head;
+}
+EXPORT_SYMBOL(find_devices);
+
+/**
+ * Construct and return a list of the device_nodes with a given type.
+ */
+struct device_node *find_type_devices(const char *type)
+{
+	struct device_node *head, **prevp, *np;
+
+	prevp = &head;
+	for (np = allnodes; np != 0; np = np->allnext) {
+		if (np->type != 0 && strcasecmp(np->type, type) == 0) {
+			*prevp = np;
+			prevp = &np->next;
+		}
+	}
+	*prevp = NULL;
+	return head;
+}
+EXPORT_SYMBOL(find_type_devices);
+
+/**
+ * Returns all nodes linked together
+ */
+struct device_node *find_all_nodes(void)
+{
+	struct device_node *head, **prevp, *np;
+
+	prevp = &head;
+	for (np = allnodes; np != 0; np = np->allnext) {
+		*prevp = np;
+		prevp = &np->next;
+	}
+	*prevp = NULL;
+	return head;
+}
+EXPORT_SYMBOL(find_all_nodes);
+
+/** Checks if the given "compat" string matches one of the strings in
+ * the device's "compatible" property
+ */
+int device_is_compatible(struct device_node *device, const char *compat)
+{
+	const char* cp;
+	int cplen, l;
+
+	cp = (char *) get_property(device, "compatible", &cplen);
+	if (cp == NULL)
+		return 0;
+	while (cplen > 0) {
+		if (strncasecmp(cp, compat, strlen(compat)) == 0)
+			return 1;
+		l = strlen(cp) + 1;
+		cp += l;
+		cplen -= l;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(device_is_compatible);
+
+
+/**
+ * Indicates whether the root node has a given value in its
+ * compatible property.
+ */
+int machine_is_compatible(const char *compat)
+{
+	struct device_node *root;
+	int rc = 0;
+
+	root = of_find_node_by_path("/");
+	if (root) {
+		rc = device_is_compatible(root, compat);
+		of_node_put(root);
+	}
+	return rc;
+}
+EXPORT_SYMBOL(machine_is_compatible);
+
+/**
+ * Construct and return a list of the device_nodes with a given type
+ * and compatible property.
+ */
+struct device_node *find_compatible_devices(const char *type,
+					    const char *compat)
+{
+	struct device_node *head, **prevp, *np;
+
+	prevp = &head;
+	for (np = allnodes; np != 0; np = np->allnext) {
+		if (type != NULL
+		    && !(np->type != 0 && strcasecmp(np->type, type) == 0))
+			continue;
+		if (device_is_compatible(np, compat)) {
+			*prevp = np;
+			prevp = &np->next;
+		}
+	}
+	*prevp = NULL;
+	return head;
+}
+EXPORT_SYMBOL(find_compatible_devices);
+
+/**
+ * Find the device_node with a given full_name.
+ */
+struct device_node *find_path_device(const char *path)
+{
+	struct device_node *np;
+
+	for (np = allnodes; np != 0; np = np->allnext)
+		if (np->full_name != 0 && strcasecmp(np->full_name, path) == 0)
+			return np;
+	return NULL;
+}
+EXPORT_SYMBOL(find_path_device);
+
+/*******
+ *
+ * New implementation of the OF "find" APIs, return a refcounted
+ * object, call of_node_put() when done.  The device tree and list
+ * are protected by a rw_lock.
+ *
+ * Note that property management will need some locking as well,
+ * this isn't dealt with yet.
+ *
+ *******/
+
+/**
+ *	of_find_node_by_name - Find a node by its "name" property
+ *	@from:	The node to start searching from or NULL, the node
+ *		you pass will not be searched, only the next one
+ *		will; typically, you pass what the previous call
+ *		returned. of_node_put() will be called on it
+ *	@name:	The name string to match against
+ *
+ *	Returns a node pointer with refcount incremented, use
+ *	of_node_put() on it when done.
+ */
+struct device_node *of_find_node_by_name(struct device_node *from,
+	const char *name)
+{
+	struct device_node *np;
+
+	read_lock(&devtree_lock);
+	np = from ? from->allnext : allnodes;
+	for (; np != 0; np = np->allnext)
+		if (np->name != 0 && strcasecmp(np->name, name) == 0
+		    && of_node_get(np))
+			break;
+	if (from)
+		of_node_put(from);
+	read_unlock(&devtree_lock);
+	return np;
+}
+EXPORT_SYMBOL(of_find_node_by_name);
+
+/**
+ *	of_find_node_by_type - Find a node by its "device_type" property
+ *	@from:	The node to start searching from or NULL, the node
+ *		you pass will not be searched, only the next one
+ *		will; typically, you pass what the previous call
+ *		returned. of_node_put() will be called on it
+ *	@name:	The type string to match against
+ *
+ *	Returns a node pointer with refcount incremented, use
+ *	of_node_put() on it when done.
+ */
+struct device_node *of_find_node_by_type(struct device_node *from,
+	const char *type)
+{
+	struct device_node *np;
+
+	read_lock(&devtree_lock);
+	np = from ? from->allnext : allnodes;
+	for (; np != 0; np = np->allnext)
+		if (np->type != 0 && strcasecmp(np->type, type) == 0
+		    && of_node_get(np))
+			break;
+	if (from)
+		of_node_put(from);
+	read_unlock(&devtree_lock);
+	return np;
+}
+EXPORT_SYMBOL(of_find_node_by_type);
+
+/**
+ *	of_find_compatible_node - Find a node based on type and one of the
+ *                                tokens in its "compatible" property
+ *	@from:		The node to start searching from or NULL, the node
+ *			you pass will not be searched, only the next one
+ *			will; typically, you pass what the previous call
+ *			returned. of_node_put() will be called on it
+ *	@type:		The type string to match "device_type" or NULL to ignore
+ *	@compatible:	The string to match to one of the tokens in the device
+ *			"compatible" list.
+ *
+ *	Returns a node pointer with refcount incremented, use
+ *	of_node_put() on it when done.
+ */
+struct device_node *of_find_compatible_node(struct device_node *from,
+	const char *type, const char *compatible)
+{
+	struct device_node *np;
+
+	read_lock(&devtree_lock);
+	np = from ? from->allnext : allnodes;
+	for (; np != 0; np = np->allnext) {
+		if (type != NULL
+		    && !(np->type != 0 && strcasecmp(np->type, type) == 0))
+			continue;
+		if (device_is_compatible(np, compatible) && of_node_get(np))
+			break;
+	}
+	if (from)
+		of_node_put(from);
+	read_unlock(&devtree_lock);
+	return np;
+}
+EXPORT_SYMBOL(of_find_compatible_node);
+
+/**
+ *	of_find_node_by_path - Find a node matching a full OF path
+ *	@path:	The full path to match
+ *
+ *	Returns a node pointer with refcount incremented, use
+ *	of_node_put() on it when done.
+ */
+struct device_node *of_find_node_by_path(const char *path)
+{
+	struct device_node *np = allnodes;
+
+	read_lock(&devtree_lock);
+	for (; np != 0; np = np->allnext) {
+		if (np->full_name != 0 && strcasecmp(np->full_name, path) == 0
+		    && of_node_get(np))
+			break;
+	}
+	read_unlock(&devtree_lock);
+	return np;
+}
+EXPORT_SYMBOL(of_find_node_by_path);
+
+/**
+ *	of_find_node_by_phandle - Find a node given a phandle
+ *	@handle:	phandle of the node to find
+ *
+ *	Returns a node pointer with refcount incremented, use
+ *	of_node_put() on it when done.
+ */
+struct device_node *of_find_node_by_phandle(phandle handle)
+{
+	struct device_node *np;
+
+	read_lock(&devtree_lock);
+	for (np = allnodes; np != 0; np = np->allnext)
+		if (np->linux_phandle == handle)
+			break;
+	if (np)
+		of_node_get(np);
+	read_unlock(&devtree_lock);
+	return np;
+}
+EXPORT_SYMBOL(of_find_node_by_phandle);
+
+/**
+ *	of_find_all_nodes - Get next node in global list
+ *	@prev:	Previous node or NULL to start iteration
+ *		of_node_put() will be called on it
+ *
+ *	Returns a node pointer with refcount incremented, use
+ *	of_node_put() on it when done.
+ */
+struct device_node *of_find_all_nodes(struct device_node *prev)
+{
+	struct device_node *np;
+
+	read_lock(&devtree_lock);
+	np = prev ? prev->allnext : allnodes;
+	for (; np != 0; np = np->allnext)
+		if (of_node_get(np))
+			break;
+	if (prev)
+		of_node_put(prev);
+	read_unlock(&devtree_lock);
+	return np;
+}
+EXPORT_SYMBOL(of_find_all_nodes);
+
+/**
+ *	of_get_parent - Get a node's parent if any
+ *	@node:	Node to get parent
+ *
+ *	Returns a node pointer with refcount incremented, use
+ *	of_node_put() on it when done.
+ */
+struct device_node *of_get_parent(const struct device_node *node)
+{
+	struct device_node *np;
+
+	if (!node)
+		return NULL;
+
+	read_lock(&devtree_lock);
+	np = of_node_get(node->parent);
+	read_unlock(&devtree_lock);
+	return np;
+}
+EXPORT_SYMBOL(of_get_parent);
+
+/**
+ *	of_get_next_child - Iterate a node childs
+ *	@node:	parent node
+ *	@prev:	previous child of the parent node, or NULL to get first
+ *
+ *	Returns a node pointer with refcount incremented, use
+ *	of_node_put() on it when done.
+ */
+struct device_node *of_get_next_child(const struct device_node *node,
+	struct device_node *prev)
+{
+	struct device_node *next;
+
+	read_lock(&devtree_lock);
+	next = prev ? prev->sibling : node->child;
+	for (; next != 0; next = next->sibling)
+		if (of_node_get(next))
+			break;
+	if (prev)
+		of_node_put(prev);
+	read_unlock(&devtree_lock);
+	return next;
+}
+EXPORT_SYMBOL(of_get_next_child);
+
+/**
+ *	of_node_get - Increment refcount of a node
+ *	@node:	Node to inc refcount, NULL is supported to
+ *		simplify writing of callers
+ *
+ *	Returns node.
+ */
+struct device_node *of_node_get(struct device_node *node)
+{
+	if (node)
+		kref_get(&node->kref);
+	return node;
+}
+EXPORT_SYMBOL(of_node_get);
+
+static inline struct device_node * kref_to_device_node(struct kref *kref)
+{
+	return container_of(kref, struct device_node, kref);
+}
+
+/**
+ *	of_node_release - release a dynamically allocated node
+ *	@kref:  kref element of the node to be released
+ *
+ *	In of_node_put() this function is passed to kref_put()
+ *	as the destructor.
+ */
+static void of_node_release(struct kref *kref)
+{
+	struct device_node *node = kref_to_device_node(kref);
+	struct property *prop = node->properties;
+
+	if (!OF_IS_DYNAMIC(node))
+		return;
+	while (prop) {
+		struct property *next = prop->next;
+		kfree(prop->name);
+		kfree(prop->value);
+		kfree(prop);
+		prop = next;
+	}
+	kfree(node->intrs);
+	kfree(node->addrs);
+	kfree(node->full_name);
+	kfree(node->data);
+	kfree(node);
+}
+
+/**
+ *	of_node_put - Decrement refcount of a node
+ *	@node:	Node to dec refcount, NULL is supported to
+ *		simplify writing of callers
+ *
+ */
+void of_node_put(struct device_node *node)
+{
+	if (node)
+		kref_put(&node->kref, of_node_release);
+}
+EXPORT_SYMBOL(of_node_put);
+
+/*
+ * Plug a device node into the tree and global list.
+ */
+void of_attach_node(struct device_node *np)
+{
+	write_lock(&devtree_lock);
+	np->sibling = np->parent->child;
+	np->allnext = allnodes;
+	np->parent->child = np;
+	allnodes = np;
+	write_unlock(&devtree_lock);
+}
+
+/*
+ * "Unplug" a node from the device tree.  The caller must hold
+ * a reference to the node.  The memory associated with the node
+ * is not freed until its refcount goes to zero.
+ */
+void of_detach_node(const struct device_node *np)
+{
+	struct device_node *parent;
+
+	write_lock(&devtree_lock);
+
+	parent = np->parent;
+
+	if (allnodes == np)
+		allnodes = np->allnext;
+	else {
+		struct device_node *prev;
+		for (prev = allnodes;
+		     prev->allnext != np;
+		     prev = prev->allnext)
+			;
+		prev->allnext = np->allnext;
+	}
+
+	if (parent->child == np)
+		parent->child = np->sibling;
+	else {
+		struct device_node *prevsib;
+		for (prevsib = np->parent->child;
+		     prevsib->sibling != np;
+		     prevsib = prevsib->sibling)
+			;
+		prevsib->sibling = np->sibling;
+	}
+
+	write_unlock(&devtree_lock);
+}
+
+#ifdef CONFIG_PPC_PSERIES
+/*
+ * Fix up the uninitialized fields in a new device node:
+ * name, type, n_addrs, addrs, n_intrs, intrs, and pci-specific fields
+ *
+ * A lot of boot-time code is duplicated here, because functions such
+ * as finish_node_interrupts, interpret_pci_props, etc. cannot use the
+ * slab allocator.
+ *
+ * This should probably be split up into smaller chunks.
+ */
+
+static int of_finish_dynamic_node(struct device_node *node,
+				  unsigned long *unused1, int unused2,
+				  int unused3, int unused4)
+{
+	struct device_node *parent = of_get_parent(node);
+	int err = 0;
+	phandle *ibm_phandle;
+
+	node->name = get_property(node, "name", NULL);
+	node->type = get_property(node, "device_type", NULL);
+
+	if (!parent) {
+		err = -ENODEV;
+		goto out;
+	}
+
+	/* We don't support that function on PowerMac, at least
+	 * not yet
+	 */
+	if (systemcfg->platform == PLATFORM_POWERMAC)
+		return -ENODEV;
+
+	/* fix up new node's linux_phandle field */
+	if ((ibm_phandle = (unsigned int *)get_property(node, "ibm,phandle", NULL)))
+		node->linux_phandle = *ibm_phandle;
+
+out:
+	of_node_put(parent);
+	return err;
+}
+
+static int prom_reconfig_notifier(struct notifier_block *nb,
+				  unsigned long action, void *node)
+{
+	int err;
+
+	switch (action) {
+	case PSERIES_RECONFIG_ADD:
+		err = finish_node(node, NULL, of_finish_dynamic_node, 0, 0, 0);
+		if (err < 0) {
+			printk(KERN_ERR "finish_node returned %d\n", err);
+			err = NOTIFY_BAD;
+		}
+		break;
+	default:
+		err = NOTIFY_DONE;
+		break;
+	}
+	return err;
+}
+
+static struct notifier_block prom_reconfig_nb = {
+	.notifier_call = prom_reconfig_notifier,
+	.priority = 10, /* This one needs to run first */
+};
+
+static int __init prom_reconfig_setup(void)
+{
+	return pSeries_reconfig_notifier_register(&prom_reconfig_nb);
+}
+__initcall(prom_reconfig_setup);
+#endif
+
+/*
+ * Find a property with a given name for a given node
+ * and return the value.
+ */
+unsigned char *get_property(struct device_node *np, const char *name,
+			    int *lenp)
+{
+	struct property *pp;
+
+	for (pp = np->properties; pp != 0; pp = pp->next)
+		if (strcmp(pp->name, name) == 0) {
+			if (lenp != 0)
+				*lenp = pp->length;
+			return pp->value;
+		}
+	return NULL;
+}
+EXPORT_SYMBOL(get_property);
+
+/*
+ * Add a property to a node
+ */
+void prom_add_property(struct device_node* np, struct property* prop)
+{
+	struct property **next = &np->properties;
+
+	prop->next = NULL;	
+	while (*next)
+		next = &(*next)->next;
+	*next = prop;
+}
+
+/* I quickly hacked that one, check against spec ! */
+static inline unsigned long
+bus_space_to_resource_flags(unsigned int bus_space)
+{
+	u8 space = (bus_space >> 24) & 0xf;
+	if (space == 0)
+		space = 0x02;
+	if (space == 0x02)
+		return IORESOURCE_MEM;
+	else if (space == 0x01)
+		return IORESOURCE_IO;
+	else {
+		printk(KERN_WARNING "prom.c: bus_space_to_resource_flags(), space: %x\n",
+		    	bus_space);
+		return 0;
+	}
+}
+
+static struct resource *find_parent_pci_resource(struct pci_dev* pdev,
+						 struct address_range *range)
+{
+	unsigned long mask;
+	int i;
+
+	/* Check this one */
+	mask = bus_space_to_resource_flags(range->space);
+	for (i=0; i<DEVICE_COUNT_RESOURCE; i++) {
+		if ((pdev->resource[i].flags & mask) == mask &&
+			pdev->resource[i].start <= range->address &&
+			pdev->resource[i].end > range->address) {
+				if ((range->address + range->size - 1) > pdev->resource[i].end) {
+					/* Add better message */
+					printk(KERN_WARNING "PCI/OF resource overlap !\n");
+					return NULL;
+				}
+				break;
+			}
+	}
+	if (i == DEVICE_COUNT_RESOURCE)
+		return NULL;
+	return &pdev->resource[i];
+}
+
+/*
+ * Request an OF device resource. Currently handles child of PCI devices,
+ * or other nodes attached to the root node. Ultimately, put some
+ * link to resources in the OF node.
+ */
+struct resource *request_OF_resource(struct device_node* node, int index,
+				     const char* name_postfix)
+{
+	struct pci_dev* pcidev;
+	u8 pci_bus, pci_devfn;
+	unsigned long iomask;
+	struct device_node* nd;
+	struct resource* parent;
+	struct resource *res = NULL;
+	int nlen, plen;
+
+	if (index >= node->n_addrs)
+		goto fail;
+
+	/* Sanity check on bus space */
+	iomask = bus_space_to_resource_flags(node->addrs[index].space);
+	if (iomask & IORESOURCE_MEM)
+		parent = &iomem_resource;
+	else if (iomask & IORESOURCE_IO)
+		parent = &ioport_resource;
+	else
+		goto fail;
+
+	/* Find a PCI parent if any */
+	nd = node;
+	pcidev = NULL;
+	while (nd) {
+		if (!pci_device_from_OF_node(nd, &pci_bus, &pci_devfn))
+			pcidev = pci_find_slot(pci_bus, pci_devfn);
+		if (pcidev) break;
+		nd = nd->parent;
+	}
+	if (pcidev)
+		parent = find_parent_pci_resource(pcidev, &node->addrs[index]);
+	if (!parent) {
+		printk(KERN_WARNING "request_OF_resource(%s), parent not found\n",
+			node->name);
+		goto fail;
+	}
+
+	res = __request_region(parent, node->addrs[index].address,
+			       node->addrs[index].size, NULL);
+	if (!res)
+		goto fail;
+	nlen = strlen(node->name);
+	plen = name_postfix ? strlen(name_postfix) : 0;
+	res->name = (const char *)kmalloc(nlen+plen+1, GFP_KERNEL);
+	if (res->name) {
+		strcpy((char *)res->name, node->name);
+		if (plen)
+			strcpy((char *)res->name+nlen, name_postfix);
+	}
+	return res;
+fail:
+	return NULL;
+}
+EXPORT_SYMBOL(request_OF_resource);
+
+int release_OF_resource(struct device_node *node, int index)
+{
+	struct pci_dev* pcidev;
+	u8 pci_bus, pci_devfn;
+	unsigned long iomask, start, end;
+	struct device_node* nd;
+	struct resource* parent;
+	struct resource *res = NULL;
+
+	if (index >= node->n_addrs)
+		return -EINVAL;
+
+	/* Sanity check on bus space */
+	iomask = bus_space_to_resource_flags(node->addrs[index].space);
+	if (iomask & IORESOURCE_MEM)
+		parent = &iomem_resource;
+	else if (iomask & IORESOURCE_IO)
+		parent = &ioport_resource;
+	else
+		return -EINVAL;
+
+	/* Find a PCI parent if any */
+	nd = node;
+	pcidev = NULL;
+	while(nd) {
+		if (!pci_device_from_OF_node(nd, &pci_bus, &pci_devfn))
+			pcidev = pci_find_slot(pci_bus, pci_devfn);
+		if (pcidev) break;
+		nd = nd->parent;
+	}
+	if (pcidev)
+		parent = find_parent_pci_resource(pcidev, &node->addrs[index]);
+	if (!parent) {
+		printk(KERN_WARNING "release_OF_resource(%s), parent not found\n",
+			node->name);
+		return -ENODEV;
+	}
+
+	/* Find us in the parent and its childs */
+	res = parent->child;
+	start = node->addrs[index].address;
+	end = start + node->addrs[index].size - 1;
+	while (res) {
+		if (res->start == start && res->end == end &&
+		    (res->flags & IORESOURCE_BUSY))
+		    	break;
+		if (res->start <= start && res->end >= end)
+			res = res->child;
+		else
+			res = res->sibling;
+	}
+	if (!res)
+		return -ENODEV;
+
+	if (res->name) {
+		kfree(res->name);
+		res->name = NULL;
+	}
+	release_resource(res);
+	kfree(res);
+
+	return 0;
+}
+EXPORT_SYMBOL(release_OF_resource);

arch/powerpc/kernel/prom_init.c

@@ -0,0 +1,2126 @@
+/*
+ * Procedures for interfacing to Open Firmware.
+ *
+ * Paul Mackerras	August 1996.
+ * Copyright (C) 1996-2005 Paul Mackerras.
+ * 
+ *  Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
+ *    {engebret|bergner}@us.ibm.com 
+ *
+ *      This program is free software; you can redistribute it and/or
+ *      modify it under the terms of the GNU General Public License
+ *      as published by the Free Software Foundation; either version
+ *      2 of the License, or (at your option) any later version.
+ */
+
+#undef DEBUG_PROM
+
+#include <stdarg.h>
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/init.h>
+#include <linux/threads.h>
+#include <linux/spinlock.h>
+#include <linux/types.h>
+#include <linux/pci.h>
+#include <linux/proc_fs.h>
+#include <linux/stringify.h>
+#include <linux/delay.h>
+#include <linux/initrd.h>
+#include <linux/bitops.h>
+#include <asm/prom.h>
+#include <asm/rtas.h>
+#include <asm/page.h>
+#include <asm/processor.h>
+#include <asm/irq.h>
+#include <asm/io.h>
+#include <asm/smp.h>
+#include <asm/system.h>
+#include <asm/mmu.h>
+#include <asm/pgtable.h>
+#include <asm/pci.h>
+#include <asm/iommu.h>
+#include <asm/bootinfo.h>
+#include <asm/btext.h>
+#include <asm/sections.h>
+#include <asm/machdep.h>
+
+#ifdef CONFIG_LOGO_LINUX_CLUT224
+#include <linux/linux_logo.h>
+extern const struct linux_logo logo_linux_clut224;
+#endif
+
+/*
+ * Properties whose value is longer than this get excluded from our
+ * copy of the device tree. This value does need to be big enough to
+ * ensure that we don't lose things like the interrupt-map property
+ * on a PCI-PCI bridge.
+ */
+#define MAX_PROPERTY_LENGTH	(1UL * 1024 * 1024)
+
+/*
+ * Eventually bump that one up
+ */
+#define DEVTREE_CHUNK_SIZE	0x100000
+
+/*
+ * This is the size of the local memory reserve map that gets copied
+ * into the boot params passed to the kernel. That size is totally
+ * flexible as the kernel just reads the list until it encounters an
+ * entry with size 0, so it can be changed without breaking binary
+ * compatibility
+ */
+#define MEM_RESERVE_MAP_SIZE	8
+
+/*
+ * prom_init() is called very early on, before the kernel text
+ * and data have been mapped to KERNELBASE.  At this point the code
+ * is running at whatever address it has been loaded at.
+ * On ppc32 we compile with -mrelocatable, which means that references
+ * to extern and static variables get relocated automatically.
+ * On ppc64 we have to relocate the references explicitly with
+ * RELOC.  (Note that strings count as static variables.)
+ *
+ * Because OF may have mapped I/O devices into the area starting at
+ * KERNELBASE, particularly on CHRP machines, we can't safely call
+ * OF once the kernel has been mapped to KERNELBASE.  Therefore all
+ * OF calls must be done within prom_init().
+ *
+ * ADDR is used in calls to call_prom.  The 4th and following
+ * arguments to call_prom should be 32-bit values.
+ * On ppc64, 64 bit values are truncated to 32 bits (and
+ * fortunately don't get interpreted as two arguments).
+ */
+#ifdef CONFIG_PPC64
+#define RELOC(x)        (*PTRRELOC(&(x)))
+#define ADDR(x)		(u32) add_reloc_offset((unsigned long)(x))
+#else
+#define RELOC(x)	(x)
+#define ADDR(x)		(u32) (x)
+#endif
+
+#define PROM_BUG() do {						\
+        prom_printf("kernel BUG at %s line 0x%x!\n",		\
+		    RELOC(__FILE__), __LINE__);			\
+        __asm__ __volatile__(".long " BUG_ILLEGAL_INSTR);	\
+} while (0)
+
+#ifdef DEBUG_PROM
+#define prom_debug(x...)	prom_printf(x)
+#else
+#define prom_debug(x...)
+#endif
+
+#ifdef CONFIG_PPC32
+#define PLATFORM_POWERMAC	_MACH_Pmac
+#define PLATFORM_CHRP		_MACH_chrp
+#endif
+
+
+typedef u32 prom_arg_t;
+
+struct prom_args {
+        u32 service;
+        u32 nargs;
+        u32 nret;
+        prom_arg_t args[10];
+};
+
+struct prom_t {
+	ihandle root;
+	ihandle chosen;
+	int cpu;
+	ihandle stdout;
+};
+
+struct mem_map_entry {
+	unsigned long	base;
+	unsigned long	size;
+};
+
+typedef u32 cell_t;
+
+extern void __start(unsigned long r3, unsigned long r4, unsigned long r5);
+
+#ifdef CONFIG_PPC64
+extern void enter_prom(struct prom_args *args, unsigned long entry);
+#else
+static inline void enter_prom(struct prom_args *args, unsigned long entry)
+{
+	((void (*)(struct prom_args *))entry)(args);
+}
+#endif
+
+extern void copy_and_flush(unsigned long dest, unsigned long src,
+			   unsigned long size, unsigned long offset);
+
+/* prom structure */
+static struct prom_t __initdata prom;
+
+static unsigned long prom_entry __initdata;
+
+#define PROM_SCRATCH_SIZE 256
+
+static char __initdata of_stdout_device[256];
+static char __initdata prom_scratch[PROM_SCRATCH_SIZE];
+
+static unsigned long __initdata dt_header_start;
+static unsigned long __initdata dt_struct_start, dt_struct_end;
+static unsigned long __initdata dt_string_start, dt_string_end;
+
+static unsigned long __initdata prom_initrd_start, prom_initrd_end;
+
+#ifdef CONFIG_PPC64
+static int __initdata iommu_force_on;
+static int __initdata ppc64_iommu_off;
+static unsigned long __initdata prom_tce_alloc_start;
+static unsigned long __initdata prom_tce_alloc_end;
+#endif
+
+static int __initdata of_platform;
+
+static char __initdata prom_cmd_line[COMMAND_LINE_SIZE];
+
+static unsigned long __initdata prom_memory_limit;
+
+static unsigned long __initdata alloc_top;
+static unsigned long __initdata alloc_top_high;
+static unsigned long __initdata alloc_bottom;
+static unsigned long __initdata rmo_top;
+static unsigned long __initdata ram_top;
+
+static struct mem_map_entry __initdata mem_reserve_map[MEM_RESERVE_MAP_SIZE];
+static int __initdata mem_reserve_cnt;
+
+static cell_t __initdata regbuf[1024];
+
+
+#define MAX_CPU_THREADS 2
+
+/* TO GO */
+#ifdef CONFIG_HMT
+struct {
+	unsigned int pir;
+	unsigned int threadid;
+} hmt_thread_data[NR_CPUS];
+#endif /* CONFIG_HMT */
+
+/*
+ * Error results ... some OF calls will return "-1" on error, some
+ * will return 0, some will return either. To simplify, here are
+ * macros to use with any ihandle or phandle return value to check if
+ * it is valid
+ */
+
+#define PROM_ERROR		(-1u)
+#define PHANDLE_VALID(p)	((p) != 0 && (p) != PROM_ERROR)
+#define IHANDLE_VALID(i)	((i) != 0 && (i) != PROM_ERROR)
+
+
+/* This is the one and *ONLY* place where we actually call open
+ * firmware.
+ */
+
+static int __init call_prom(const char *service, int nargs, int nret, ...)
+{
+	int i;
+	struct prom_args args;
+	va_list list;
+
+	args.service = ADDR(service);
+	args.nargs = nargs;
+	args.nret = nret;
+
+	va_start(list, nret);
+	for (i = 0; i < nargs; i++)
+		args.args[i] = va_arg(list, prom_arg_t);
+	va_end(list);
+
+	for (i = 0; i < nret; i++)
+		args.args[nargs+i] = 0;
+
+	enter_prom(&args, RELOC(prom_entry));
+
+	return (nret > 0) ? args.args[nargs] : 0;
+}
+
+static int __init call_prom_ret(const char *service, int nargs, int nret,
+				prom_arg_t *rets, ...)
+{
+	int i;
+	struct prom_args args;
+	va_list list;
+
+	args.service = ADDR(service);
+	args.nargs = nargs;
+	args.nret = nret;
+
+	va_start(list, rets);
+	for (i = 0; i < nargs; i++)
+		args.args[i] = va_arg(list, prom_arg_t);
+	va_end(list);
+
+	for (i = 0; i < nret; i++)
+		rets[nargs+i] = 0;
+
+	enter_prom(&args, RELOC(prom_entry));
+
+	if (rets != NULL)
+		for (i = 1; i < nret; ++i)
+			rets[i] = args.args[nargs+i];
+
+	return (nret > 0) ? args.args[nargs] : 0;
+}
+
+
+static unsigned int __init prom_claim(unsigned long virt, unsigned long size,
+				unsigned long align)
+{
+	return (unsigned int)call_prom("claim", 3, 1,
+				       (prom_arg_t)virt, (prom_arg_t)size,
+				       (prom_arg_t)align);
+}
+
+static void __init prom_print(const char *msg)
+{
+	const char *p, *q;
+	struct prom_t *_prom = &RELOC(prom);
+
+	if (_prom->stdout == 0)
+		return;
+
+	for (p = msg; *p != 0; p = q) {
+		for (q = p; *q != 0 && *q != '\n'; ++q)
+			;
+		if (q > p)
+			call_prom("write", 3, 1, _prom->stdout, p, q - p);
+		if (*q == 0)
+			break;
+		++q;
+		call_prom("write", 3, 1, _prom->stdout, ADDR("\r\n"), 2);
+	}
+}
+
+
+static void __init prom_print_hex(unsigned long val)
+{
+	int i, nibbles = sizeof(val)*2;
+	char buf[sizeof(val)*2+1];
+	struct prom_t *_prom = &RELOC(prom);
+
+	for (i = nibbles-1;  i >= 0;  i--) {
+		buf[i] = (val & 0xf) + '0';
+		if (buf[i] > '9')
+			buf[i] += ('a'-'0'-10);
+		val >>= 4;
+	}
+	buf[nibbles] = '\0';
+	call_prom("write", 3, 1, _prom->stdout, buf, nibbles);
+}
+
+
+static void __init prom_printf(const char *format, ...)
+{
+	const char *p, *q, *s;
+	va_list args;
+	unsigned long v;
+	struct prom_t *_prom = &RELOC(prom);
+
+	va_start(args, format);
+#ifdef CONFIG_PPC64
+	format = PTRRELOC(format);
+#endif
+	for (p = format; *p != 0; p = q) {
+		for (q = p; *q != 0 && *q != '\n' && *q != '%'; ++q)
+			;
+		if (q > p)
+			call_prom("write", 3, 1, _prom->stdout, p, q - p);
+		if (*q == 0)
+			break;
+		if (*q == '\n') {
+			++q;
+			call_prom("write", 3, 1, _prom->stdout,
+				  ADDR("\r\n"), 2);
+			continue;
+		}
+		++q;
+		if (*q == 0)
+			break;
+		switch (*q) {
+		case 's':
+			++q;
+			s = va_arg(args, const char *);
+			prom_print(s);
+			break;
+		case 'x':
+			++q;
+			v = va_arg(args, unsigned long);
+			prom_print_hex(v);
+			break;
+		}
+	}
+}
+
+
+static void __init __attribute__((noreturn)) prom_panic(const char *reason)
+{
+#ifdef CONFIG_PPC64
+	reason = PTRRELOC(reason);
+#endif
+	prom_print(reason);
+	/* ToDo: should put up an SRC here on p/iSeries */
+	call_prom("exit", 0, 0);
+
+	for (;;)			/* should never get here */
+		;
+}
+
+
+static int __init prom_next_node(phandle *nodep)
+{
+	phandle node;
+
+	if ((node = *nodep) != 0
+	    && (*nodep = call_prom("child", 1, 1, node)) != 0)
+		return 1;
+	if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
+		return 1;
+	for (;;) {
+		if ((node = call_prom("parent", 1, 1, node)) == 0)
+			return 0;
+		if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
+			return 1;
+	}
+}
+
+static int __init prom_getprop(phandle node, const char *pname,
+			       void *value, size_t valuelen)
+{
+	return call_prom("getprop", 4, 1, node, ADDR(pname),
+			 (u32)(unsigned long) value, (u32) valuelen);
+}
+
+static int __init prom_getproplen(phandle node, const char *pname)
+{
+	return call_prom("getproplen", 2, 1, node, ADDR(pname));
+}
+
+static int __init prom_setprop(phandle node, const char *pname,
+			       void *value, size_t valuelen)
+{
+	return call_prom("setprop", 4, 1, node, ADDR(pname),
+			 (u32)(unsigned long) value, (u32) valuelen);
+}
+
+/* We can't use the standard versions because of RELOC headaches. */
+#define isxdigit(c)	(('0' <= (c) && (c) <= '9') \
+			 || ('a' <= (c) && (c) <= 'f') \
+			 || ('A' <= (c) && (c) <= 'F'))
+
+#define isdigit(c)	('0' <= (c) && (c) <= '9')
+#define islower(c)	('a' <= (c) && (c) <= 'z')
+#define toupper(c)	(islower(c) ? ((c) - 'a' + 'A') : (c))
+
+unsigned long prom_strtoul(const char *cp, const char **endp)
+{
+	unsigned long result = 0, base = 10, value;
+
+	if (*cp == '0') {
+		base = 8;
+		cp++;
+		if (toupper(*cp) == 'X') {
+			cp++;
+			base = 16;
+		}
+	}
+
+	while (isxdigit(*cp) &&
+	       (value = isdigit(*cp) ? *cp - '0' : toupper(*cp) - 'A' + 10) < base) {
+		result = result * base + value;
+		cp++;
+	}
+
+	if (endp)
+		*endp = cp;
+
+	return result;
+}
+
+unsigned long prom_memparse(const char *ptr, const char **retptr)
+{
+	unsigned long ret = prom_strtoul(ptr, retptr);
+	int shift = 0;
+
+	/*
+	 * We can't use a switch here because GCC *may* generate a
+	 * jump table which won't work, because we're not running at
+	 * the address we're linked at.
+	 */
+	if ('G' == **retptr || 'g' == **retptr)
+		shift = 30;
+
+	if ('M' == **retptr || 'm' == **retptr)
+		shift = 20;
+
+	if ('K' == **retptr || 'k' == **retptr)
+		shift = 10;
+
+	if (shift) {
+		ret <<= shift;
+		(*retptr)++;
+	}
+
+	return ret;
+}
+
+/*
+ * Early parsing of the command line passed to the kernel, used for
+ * "mem=x" and the options that affect the iommu
+ */
+static void __init early_cmdline_parse(void)
+{
+	struct prom_t *_prom = &RELOC(prom);
+	char *opt, *p;
+	int l = 0;
+
+	RELOC(prom_cmd_line[0]) = 0;
+	p = RELOC(prom_cmd_line);
+	if ((long)_prom->chosen > 0)
+		l = prom_getprop(_prom->chosen, "bootargs", p, COMMAND_LINE_SIZE-1);
+#ifdef CONFIG_CMDLINE
+	if (l == 0) /* dbl check */
+		strlcpy(RELOC(prom_cmd_line),
+			RELOC(CONFIG_CMDLINE), sizeof(prom_cmd_line));
+#endif /* CONFIG_CMDLINE */
+	prom_printf("command line: %s\n", RELOC(prom_cmd_line));
+
+#ifdef CONFIG_PPC64
+	opt = strstr(RELOC(prom_cmd_line), RELOC("iommu="));
+	if (opt) {
+		prom_printf("iommu opt is: %s\n", opt);
+		opt += 6;
+		while (*opt && *opt == ' ')
+			opt++;
+		if (!strncmp(opt, RELOC("off"), 3))
+			RELOC(ppc64_iommu_off) = 1;
+		else if (!strncmp(opt, RELOC("force"), 5))
+			RELOC(iommu_force_on) = 1;
+	}
+#endif
+
+	opt = strstr(RELOC(prom_cmd_line), RELOC("mem="));
+	if (opt) {
+		opt += 4;
+		RELOC(prom_memory_limit) = prom_memparse(opt, (const char **)&opt);
+#ifdef CONFIG_PPC64
+		/* Align to 16 MB == size of ppc64 large page */
+		RELOC(prom_memory_limit) = ALIGN(RELOC(prom_memory_limit), 0x1000000);
+#endif
+	}
+}
+
+#ifdef CONFIG_PPC_PSERIES
+/*
+ * To tell the firmware what our capabilities are, we have to pass
+ * it a fake 32-bit ELF header containing a couple of PT_NOTE sections
+ * that contain structures that contain the actual values.
+ */
+static struct fake_elf {
+	Elf32_Ehdr	elfhdr;
+	Elf32_Phdr	phdr[2];
+	struct chrpnote {
+		u32	namesz;
+		u32	descsz;
+		u32	type;
+		char	name[8];	/* "PowerPC" */
+		struct chrpdesc {
+			u32	real_mode;
+			u32	real_base;
+			u32	real_size;
+			u32	virt_base;
+			u32	virt_size;
+			u32	load_base;
+		} chrpdesc;
+	} chrpnote;
+	struct rpanote {
+		u32	namesz;
+		u32	descsz;
+		u32	type;
+		char	name[24];	/* "IBM,RPA-Client-Config" */
+		struct rpadesc {
+			u32	lpar_affinity;
+			u32	min_rmo_size;
+			u32	min_rmo_percent;
+			u32	max_pft_size;
+			u32	splpar;
+			u32	min_load;
+			u32	new_mem_def;
+			u32	ignore_me;
+		} rpadesc;
+	} rpanote;
+} fake_elf = {
+	.elfhdr = {
+		.e_ident = { 0x7f, 'E', 'L', 'F',
+			     ELFCLASS32, ELFDATA2MSB, EV_CURRENT },
+		.e_type = ET_EXEC,	/* yeah right */
+		.e_machine = EM_PPC,
+		.e_version = EV_CURRENT,
+		.e_phoff = offsetof(struct fake_elf, phdr),
+		.e_phentsize = sizeof(Elf32_Phdr),
+		.e_phnum = 2
+	},
+	.phdr = {
+		[0] = {
+			.p_type = PT_NOTE,
+			.p_offset = offsetof(struct fake_elf, chrpnote),
+			.p_filesz = sizeof(struct chrpnote)
+		}, [1] = {
+			.p_type = PT_NOTE,
+			.p_offset = offsetof(struct fake_elf, rpanote),
+			.p_filesz = sizeof(struct rpanote)
+		}
+	},
+	.chrpnote = {
+		.namesz = sizeof("PowerPC"),
+		.descsz = sizeof(struct chrpdesc),
+		.type = 0x1275,
+		.name = "PowerPC",
+		.chrpdesc = {
+			.real_mode = ~0U,	/* ~0 means "don't care" */
+			.real_base = ~0U,
+			.real_size = ~0U,
+			.virt_base = ~0U,
+			.virt_size = ~0U,
+			.load_base = ~0U
+		},
+	},
+	.rpanote = {
+		.namesz = sizeof("IBM,RPA-Client-Config"),
+		.descsz = sizeof(struct rpadesc),
+		.type = 0x12759999,
+		.name = "IBM,RPA-Client-Config",
+		.rpadesc = {
+			.lpar_affinity = 0,
+			.min_rmo_size = 64,	/* in megabytes */
+			.min_rmo_percent = 0,
+			.max_pft_size = 48,	/* 2^48 bytes max PFT size */
+			.splpar = 1,
+			.min_load = ~0U,
+			.new_mem_def = 0
+		}
+	}
+};
+
+static void __init prom_send_capabilities(void)
+{
+	ihandle elfloader;
+
+	elfloader = call_prom("open", 1, 1, ADDR("/packages/elf-loader"));
+	if (elfloader == 0) {
+		prom_printf("couldn't open /packages/elf-loader\n");
+		return;
+	}
+	call_prom("call-method", 3, 1, ADDR("process-elf-header"),
+			elfloader, ADDR(&fake_elf));
+	call_prom("close", 1, 0, elfloader);
+}
+#endif
+
+/*
+ * Memory allocation strategy... our layout is normally:
+ *
+ *  at 14Mb or more we have vmlinux, then a gap and initrd.  In some
+ *  rare cases, initrd might end up being before the kernel though.
+ *  We assume this won't override the final kernel at 0, we have no
+ *  provision to handle that in this version, but it should hopefully
+ *  never happen.
+ *
+ *  alloc_top is set to the top of RMO, eventually shrink down if the
+ *  TCEs overlap
+ *
+ *  alloc_bottom is set to the top of kernel/initrd
+ *
+ *  from there, allocations are done this way : rtas is allocated
+ *  topmost, and the device-tree is allocated from the bottom. We try
+ *  to grow the device-tree allocation as we progress. If we can't,
+ *  then we fail, we don't currently have a facility to restart
+ *  elsewhere, but that shouldn't be necessary.
+ *
+ *  Note that calls to reserve_mem have to be done explicitly, memory
+ *  allocated with either alloc_up or alloc_down isn't automatically
+ *  reserved.
+ */
+
+
+/*
+ * Allocates memory in the RMO upward from the kernel/initrd
+ *
+ * When align is 0, this is a special case, it means to allocate in place
+ * at the current location of alloc_bottom or fail (that is basically
+ * extending the previous allocation). Used for the device-tree flattening
+ */
+static unsigned long __init alloc_up(unsigned long size, unsigned long align)
+{
+	unsigned long base = _ALIGN_UP(RELOC(alloc_bottom), align);
+	unsigned long addr = 0;
+
+	prom_debug("alloc_up(%x, %x)\n", size, align);
+	if (RELOC(ram_top) == 0)
+		prom_panic("alloc_up() called with mem not initialized\n");
+
+	if (align)
+		base = _ALIGN_UP(RELOC(alloc_bottom), align);
+	else
+		base = RELOC(alloc_bottom);
+
+	for(; (base + size) <= RELOC(alloc_top); 
+	    base = _ALIGN_UP(base + 0x100000, align)) {
+		prom_debug("    trying: 0x%x\n\r", base);
+		addr = (unsigned long)prom_claim(base, size, 0);
+		if (addr != PROM_ERROR)
+			break;
+		addr = 0;
+		if (align == 0)
+			break;
+	}
+	if (addr == 0)
+		return 0;
+	RELOC(alloc_bottom) = addr;
+
+	prom_debug(" -> %x\n", addr);
+	prom_debug("  alloc_bottom : %x\n", RELOC(alloc_bottom));
+	prom_debug("  alloc_top    : %x\n", RELOC(alloc_top));
+	prom_debug("  alloc_top_hi : %x\n", RELOC(alloc_top_high));
+	prom_debug("  rmo_top      : %x\n", RELOC(rmo_top));
+	prom_debug("  ram_top      : %x\n", RELOC(ram_top));
+
+	return addr;
+}
+
+/*
+ * Allocates memory downward, either from top of RMO, or if highmem
+ * is set, from the top of RAM.  Note that this one doesn't handle
+ * failures.  It does claim memory if highmem is not set.
+ */
+static unsigned long __init alloc_down(unsigned long size, unsigned long align,
+				       int highmem)
+{
+	unsigned long base, addr = 0;
+
+	prom_debug("alloc_down(%x, %x, %s)\n", size, align,
+		   highmem ? RELOC("(high)") : RELOC("(low)"));
+	if (RELOC(ram_top) == 0)
+		prom_panic("alloc_down() called with mem not initialized\n");
+
+	if (highmem) {
+		/* Carve out storage for the TCE table. */
+		addr = _ALIGN_DOWN(RELOC(alloc_top_high) - size, align);
+		if (addr <= RELOC(alloc_bottom))
+			return 0;
+		/* Will we bump into the RMO ? If yes, check out that we
+		 * didn't overlap existing allocations there, if we did,
+		 * we are dead, we must be the first in town !
+		 */
+		if (addr < RELOC(rmo_top)) {
+			/* Good, we are first */
+			if (RELOC(alloc_top) == RELOC(rmo_top))
+				RELOC(alloc_top) = RELOC(rmo_top) = addr;
+			else
+				return 0;
+		}
+		RELOC(alloc_top_high) = addr;
+		goto bail;
+	}
+
+	base = _ALIGN_DOWN(RELOC(alloc_top) - size, align);
+	for (; base > RELOC(alloc_bottom);
+	     base = _ALIGN_DOWN(base - 0x100000, align))  {
+		prom_debug("    trying: 0x%x\n\r", base);
+		addr = (unsigned long)prom_claim(base, size, 0);
+		if (addr != PROM_ERROR)
+			break;
+		addr = 0;
+	}
+	if (addr == 0)
+		return 0;
+	RELOC(alloc_top) = addr;
+
+ bail:
+	prom_debug(" -> %x\n", addr);
+	prom_debug("  alloc_bottom : %x\n", RELOC(alloc_bottom));
+	prom_debug("  alloc_top    : %x\n", RELOC(alloc_top));
+	prom_debug("  alloc_top_hi : %x\n", RELOC(alloc_top_high));
+	prom_debug("  rmo_top      : %x\n", RELOC(rmo_top));
+	prom_debug("  ram_top      : %x\n", RELOC(ram_top));
+
+	return addr;
+}
+
+/*
+ * Parse a "reg" cell
+ */
+static unsigned long __init prom_next_cell(int s, cell_t **cellp)
+{
+	cell_t *p = *cellp;
+	unsigned long r = 0;
+
+	/* Ignore more than 2 cells */
+	while (s > sizeof(unsigned long) / 4) {
+		p++;
+		s--;
+	}
+	r = *p++;
+#ifdef CONFIG_PPC64
+	if (s) {
+		r <<= 32;
+		r |= *(p++);
+	}
+#endif
+	*cellp = p;
+	return r;
+}
+
+/*
+ * Very dumb function for adding to the memory reserve list, but
+ * we don't need anything smarter at this point
+ *
+ * XXX Eventually check for collisions.  They should NEVER happen.
+ * If problems seem to show up, it would be a good start to track
+ * them down.
+ */
+static void reserve_mem(unsigned long base, unsigned long size)
+{
+	unsigned long top = base + size;
+	unsigned long cnt = RELOC(mem_reserve_cnt);
+
+	if (size == 0)
+		return;
+
+	/* We need to always keep one empty entry so that we
+	 * have our terminator with "size" set to 0 since we are
+	 * dumb and just copy this entire array to the boot params
+	 */
+	base = _ALIGN_DOWN(base, PAGE_SIZE);
+	top = _ALIGN_UP(top, PAGE_SIZE);
+	size = top - base;
+
+	if (cnt >= (MEM_RESERVE_MAP_SIZE - 1))
+		prom_panic("Memory reserve map exhausted !\n");
+	RELOC(mem_reserve_map)[cnt].base = base;
+	RELOC(mem_reserve_map)[cnt].size = size;
+	RELOC(mem_reserve_cnt) = cnt + 1;
+}
+
+/*
+ * Initialize memory allocation mecanism, parse "memory" nodes and
+ * obtain that way the top of memory and RMO to setup out local allocator
+ */
+static void __init prom_init_mem(void)
+{
+	phandle node;
+	char *path, type[64];
+	unsigned int plen;
+	cell_t *p, *endp;
+	struct prom_t *_prom = &RELOC(prom);
+	u32 rac, rsc;
+
+	/*
+	 * We iterate the memory nodes to find
+	 * 1) top of RMO (first node)
+	 * 2) top of memory
+	 */
+	rac = 2;
+	prom_getprop(_prom->root, "#address-cells", &rac, sizeof(rac));
+	rsc = 1;
+	prom_getprop(_prom->root, "#size-cells", &rsc, sizeof(rsc));
+	prom_debug("root_addr_cells: %x\n", (unsigned long) rac);
+	prom_debug("root_size_cells: %x\n", (unsigned long) rsc);
+
+	prom_debug("scanning memory:\n");
+	path = RELOC(prom_scratch);
+
+	for (node = 0; prom_next_node(&node); ) {
+		type[0] = 0;
+		prom_getprop(node, "device_type", type, sizeof(type));
+
+		if (strcmp(type, RELOC("memory")))
+			continue;
+	
+		plen = prom_getprop(node, "reg", RELOC(regbuf), sizeof(regbuf));
+		if (plen > sizeof(regbuf)) {
+			prom_printf("memory node too large for buffer !\n");
+			plen = sizeof(regbuf);
+		}
+		p = RELOC(regbuf);
+		endp = p + (plen / sizeof(cell_t));
+
+#ifdef DEBUG_PROM
+		memset(path, 0, PROM_SCRATCH_SIZE);
+		call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1);
+		prom_debug("  node %s :\n", path);
+#endif /* DEBUG_PROM */
+
+		while ((endp - p) >= (rac + rsc)) {
+			unsigned long base, size;
+
+			base = prom_next_cell(rac, &p);
+			size = prom_next_cell(rsc, &p);
+
+			if (size == 0)
+				continue;
+			prom_debug("    %x %x\n", base, size);
+			if (base == 0)
+				RELOC(rmo_top) = size;
+			if ((base + size) > RELOC(ram_top))
+				RELOC(ram_top) = base + size;
+		}
+	}
+
+	RELOC(alloc_bottom) = PAGE_ALIGN((unsigned long)&RELOC(_end) + 0x4000);
+
+	/* Check if we have an initrd after the kernel, if we do move our bottom
+	 * point to after it
+	 */
+	if (RELOC(prom_initrd_start)) {
+		if (RELOC(prom_initrd_end) > RELOC(alloc_bottom))
+			RELOC(alloc_bottom) = PAGE_ALIGN(RELOC(prom_initrd_end));
+	}
+
+	/*
+	 * If prom_memory_limit is set we reduce the upper limits *except* for
+	 * alloc_top_high. This must be the real top of RAM so we can put
+	 * TCE's up there.
+	 */
+
+	RELOC(alloc_top_high) = RELOC(ram_top);
+
+	if (RELOC(prom_memory_limit)) {
+		if (RELOC(prom_memory_limit) <= RELOC(alloc_bottom)) {
+			prom_printf("Ignoring mem=%x <= alloc_bottom.\n",
+				RELOC(prom_memory_limit));
+			RELOC(prom_memory_limit) = 0;
+		} else if (RELOC(prom_memory_limit) >= RELOC(ram_top)) {
+			prom_printf("Ignoring mem=%x >= ram_top.\n",
+				RELOC(prom_memory_limit));
+			RELOC(prom_memory_limit) = 0;
+		} else {
+			RELOC(ram_top) = RELOC(prom_memory_limit);
+			RELOC(rmo_top) = min(RELOC(rmo_top), RELOC(prom_memory_limit));
+		}
+	}
+
+	/*
+	 * Setup our top alloc point, that is top of RMO or top of
+	 * segment 0 when running non-LPAR.
+	 * Some RS64 machines have buggy firmware where claims up at
+	 * 1GB fail.  Cap at 768MB as a workaround.
+	 * Since 768MB is plenty of room, and we need to cap to something
+	 * reasonable on 32-bit, cap at 768MB on all machines.
+	 */
+	if (!RELOC(rmo_top))
+		RELOC(rmo_top) = RELOC(ram_top);
+	RELOC(rmo_top) = min(0x30000000ul, RELOC(rmo_top));
+	RELOC(alloc_top) = RELOC(rmo_top);
+
+	prom_printf("memory layout at init:\n");
+	prom_printf("  memory_limit : %x (16 MB aligned)\n", RELOC(prom_memory_limit));
+	prom_printf("  alloc_bottom : %x\n", RELOC(alloc_bottom));
+	prom_printf("  alloc_top    : %x\n", RELOC(alloc_top));
+	prom_printf("  alloc_top_hi : %x\n", RELOC(alloc_top_high));
+	prom_printf("  rmo_top      : %x\n", RELOC(rmo_top));
+	prom_printf("  ram_top      : %x\n", RELOC(ram_top));
+}
+
+
+/*
+ * Allocate room for and instantiate RTAS
+ */
+static void __init prom_instantiate_rtas(void)
+{
+	phandle rtas_node;
+	ihandle rtas_inst;
+	u32 base, entry = 0;
+	u32 size = 0;
+
+	prom_debug("prom_instantiate_rtas: start...\n");
+
+	rtas_node = call_prom("finddevice", 1, 1, ADDR("/rtas"));
+	prom_debug("rtas_node: %x\n", rtas_node);
+	if (!PHANDLE_VALID(rtas_node))
+		return;
+
+	prom_getprop(rtas_node, "rtas-size", &size, sizeof(size));
+	if (size == 0)
+		return;
+
+	base = alloc_down(size, PAGE_SIZE, 0);
+	if (base == 0) {
+		prom_printf("RTAS allocation failed !\n");
+		return;
+	}
+
+	rtas_inst = call_prom("open", 1, 1, ADDR("/rtas"));
+	if (!IHANDLE_VALID(rtas_inst)) {
+		prom_printf("opening rtas package failed");
+		return;
+	}
+
+	prom_printf("instantiating rtas at 0x%x ...", base);
+
+	if (call_prom_ret("call-method", 3, 2, &entry,
+			  ADDR("instantiate-rtas"),
+			  rtas_inst, base) == PROM_ERROR
+	    || entry == 0) {
+		prom_printf(" failed\n");
+		return;
+	}
+	prom_printf(" done\n");
+
+	reserve_mem(base, size);
+
+	prom_setprop(rtas_node, "linux,rtas-base", &base, sizeof(base));
+	prom_setprop(rtas_node, "linux,rtas-entry", &entry, sizeof(entry));
+
+	prom_debug("rtas base     = 0x%x\n", base);
+	prom_debug("rtas entry    = 0x%x\n", entry);
+	prom_debug("rtas size     = 0x%x\n", (long)size);
+
+	prom_debug("prom_instantiate_rtas: end...\n");
+}
+
+#ifdef CONFIG_PPC64
+/*
+ * Allocate room for and initialize TCE tables
+ */
+static void __init prom_initialize_tce_table(void)
+{
+	phandle node;
+	ihandle phb_node;
+	char compatible[64], type[64], model[64];
+	char *path = RELOC(prom_scratch);
+	u64 base, align;
+	u32 minalign, minsize;
+	u64 tce_entry, *tce_entryp;
+	u64 local_alloc_top, local_alloc_bottom;
+	u64 i;
+
+	if (RELOC(ppc64_iommu_off))
+		return;
+
+	prom_debug("starting prom_initialize_tce_table\n");
+
+	/* Cache current top of allocs so we reserve a single block */
+	local_alloc_top = RELOC(alloc_top_high);
+	local_alloc_bottom = local_alloc_top;
+
+	/* Search all nodes looking for PHBs. */
+	for (node = 0; prom_next_node(&node); ) {
+		compatible[0] = 0;
+		type[0] = 0;
+		model[0] = 0;
+		prom_getprop(node, "compatible",
+			     compatible, sizeof(compatible));
+		prom_getprop(node, "device_type", type, sizeof(type));
+		prom_getprop(node, "model", model, sizeof(model));
+
+		if ((type[0] == 0) || (strstr(type, RELOC("pci")) == NULL))
+			continue;
+
+		/* Keep the old logic in tack to avoid regression. */
+		if (compatible[0] != 0) {
+			if ((strstr(compatible, RELOC("python")) == NULL) &&
+			    (strstr(compatible, RELOC("Speedwagon")) == NULL) &&
+			    (strstr(compatible, RELOC("Winnipeg")) == NULL))
+				continue;
+		} else if (model[0] != 0) {
+			if ((strstr(model, RELOC("ython")) == NULL) &&
+			    (strstr(model, RELOC("peedwagon")) == NULL) &&
+			    (strstr(model, RELOC("innipeg")) == NULL))
+				continue;
+		}
+
+		if (prom_getprop(node, "tce-table-minalign", &minalign,
+				 sizeof(minalign)) == PROM_ERROR)
+			minalign = 0;
+		if (prom_getprop(node, "tce-table-minsize", &minsize,
+				 sizeof(minsize)) == PROM_ERROR)
+			minsize = 4UL << 20;
+
+		/*
+		 * Even though we read what OF wants, we just set the table
+		 * size to 4 MB.  This is enough to map 2GB of PCI DMA space.
+		 * By doing this, we avoid the pitfalls of trying to DMA to
+		 * MMIO space and the DMA alias hole.
+		 *
+		 * On POWER4, firmware sets the TCE region by assuming
+		 * each TCE table is 8MB. Using this memory for anything
+		 * else will impact performance, so we always allocate 8MB.
+		 * Anton
+		 */
+		if (__is_processor(PV_POWER4) || __is_processor(PV_POWER4p))
+			minsize = 8UL << 20;
+		else
+			minsize = 4UL << 20;
+
+		/* Align to the greater of the align or size */
+		align = max(minalign, minsize);
+		base = alloc_down(minsize, align, 1);
+		if (base == 0)
+			prom_panic("ERROR, cannot find space for TCE table.\n");
+		if (base < local_alloc_bottom)
+			local_alloc_bottom = base;
+
+		/* Save away the TCE table attributes for later use. */
+		prom_setprop(node, "linux,tce-base", &base, sizeof(base));
+		prom_setprop(node, "linux,tce-size", &minsize, sizeof(minsize));
+
+		/* It seems OF doesn't null-terminate the path :-( */
+		memset(path, 0, sizeof(path));
+		/* Call OF to setup the TCE hardware */
+		if (call_prom("package-to-path", 3, 1, node,
+			      path, PROM_SCRATCH_SIZE-1) == PROM_ERROR) {
+			prom_printf("package-to-path failed\n");
+		}
+
+		prom_debug("TCE table: %s\n", path);
+		prom_debug("\tnode = 0x%x\n", node);
+		prom_debug("\tbase = 0x%x\n", base);
+		prom_debug("\tsize = 0x%x\n", minsize);
+
+		/* Initialize the table to have a one-to-one mapping
+		 * over the allocated size.
+		 */
+		tce_entryp = (unsigned long *)base;
+		for (i = 0; i < (minsize >> 3) ;tce_entryp++, i++) {
+			tce_entry = (i << PAGE_SHIFT);
+			tce_entry |= 0x3;
+			*tce_entryp = tce_entry;
+		}
+
+		prom_printf("opening PHB %s", path);
+		phb_node = call_prom("open", 1, 1, path);
+		if (phb_node == 0)
+			prom_printf("... failed\n");
+		else
+			prom_printf("... done\n");
+
+		call_prom("call-method", 6, 0, ADDR("set-64-bit-addressing"),
+			  phb_node, -1, minsize,
+			  (u32) base, (u32) (base >> 32));
+		call_prom("close", 1, 0, phb_node);
+	}
+
+	reserve_mem(local_alloc_bottom, local_alloc_top - local_alloc_bottom);
+
+	if (RELOC(prom_memory_limit)) {
+		/*
+		 * We align the start to a 16MB boundary so we can map
+		 * the TCE area using large pages if possible.
+		 * The end should be the top of RAM so no need to align it.
+		 */
+		RELOC(prom_tce_alloc_start) = _ALIGN_DOWN(local_alloc_bottom,
+							  0x1000000);
+		RELOC(prom_tce_alloc_end) = local_alloc_top;
+	}
+
+	/* Flag the first invalid entry */
+	prom_debug("ending prom_initialize_tce_table\n");
+}
+#endif
+
+/*
+ * With CHRP SMP we need to use the OF to start the other processors.
+ * We can't wait until smp_boot_cpus (the OF is trashed by then)
+ * so we have to put the processors into a holding pattern controlled
+ * by the kernel (not OF) before we destroy the OF.
+ *
+ * This uses a chunk of low memory, puts some holding pattern
+ * code there and sends the other processors off to there until
+ * smp_boot_cpus tells them to do something.  The holding pattern
+ * checks that address until its cpu # is there, when it is that
+ * cpu jumps to __secondary_start().  smp_boot_cpus() takes care
+ * of setting those values.
+ *
+ * We also use physical address 0x4 here to tell when a cpu
+ * is in its holding pattern code.
+ *
+ * -- Cort
+ */
+static void __init prom_hold_cpus(void)
+{
+#ifdef CONFIG_PPC64
+	unsigned long i;
+	unsigned int reg;
+	phandle node;
+	char type[64];
+	int cpuid = 0;
+	unsigned int interrupt_server[MAX_CPU_THREADS];
+	unsigned int cpu_threads, hw_cpu_num;
+	int propsize;
+	extern void __secondary_hold(void);
+	extern unsigned long __secondary_hold_spinloop;
+	extern unsigned long __secondary_hold_acknowledge;
+	unsigned long *spinloop
+		= (void *) __pa(&__secondary_hold_spinloop);
+	unsigned long *acknowledge
+		= (void *) __pa(&__secondary_hold_acknowledge);
+#ifdef CONFIG_PPC64
+	unsigned long secondary_hold
+		= __pa(*PTRRELOC((unsigned long *)__secondary_hold));
+#else
+	unsigned long secondary_hold = __pa(&__secondary_hold);
+#endif
+	struct prom_t *_prom = &RELOC(prom);
+
+	prom_debug("prom_hold_cpus: start...\n");
+	prom_debug("    1) spinloop       = 0x%x\n", (unsigned long)spinloop);
+	prom_debug("    1) *spinloop      = 0x%x\n", *spinloop);
+	prom_debug("    1) acknowledge    = 0x%x\n",
+		   (unsigned long)acknowledge);
+	prom_debug("    1) *acknowledge   = 0x%x\n", *acknowledge);
+	prom_debug("    1) secondary_hold = 0x%x\n", secondary_hold);
+
+	/* Set the common spinloop variable, so all of the secondary cpus
+	 * will block when they are awakened from their OF spinloop.
+	 * This must occur for both SMP and non SMP kernels, since OF will
+	 * be trashed when we move the kernel.
+	 */
+	*spinloop = 0;
+
+#ifdef CONFIG_HMT
+	for (i = 0; i < NR_CPUS; i++) {
+		RELOC(hmt_thread_data)[i].pir = 0xdeadbeef;
+	}
+#endif
+	/* look for cpus */
+	for (node = 0; prom_next_node(&node); ) {
+		type[0] = 0;
+		prom_getprop(node, "device_type", type, sizeof(type));
+		if (strcmp(type, RELOC("cpu")) != 0)
+			continue;
+
+		/* Skip non-configured cpus. */
+		if (prom_getprop(node, "status", type, sizeof(type)) > 0)
+			if (strcmp(type, RELOC("okay")) != 0)
+				continue;
+
+		reg = -1;
+		prom_getprop(node, "reg", &reg, sizeof(reg));
+
+		prom_debug("\ncpuid        = 0x%x\n", cpuid);
+		prom_debug("cpu hw idx   = 0x%x\n", reg);
+
+		/* Init the acknowledge var which will be reset by
+		 * the secondary cpu when it awakens from its OF
+		 * spinloop.
+		 */
+		*acknowledge = (unsigned long)-1;
+
+		propsize = prom_getprop(node, "ibm,ppc-interrupt-server#s",
+					&interrupt_server,
+					sizeof(interrupt_server));
+		if (propsize < 0) {
+			/* no property.  old hardware has no SMT */
+			cpu_threads = 1;
+			interrupt_server[0] = reg; /* fake it with phys id */
+		} else {
+			/* We have a threaded processor */
+			cpu_threads = propsize / sizeof(u32);
+			if (cpu_threads > MAX_CPU_THREADS) {
+				prom_printf("SMT: too many threads!\n"
+					    "SMT: found %x, max is %x\n",
+					    cpu_threads, MAX_CPU_THREADS);
+				cpu_threads = 1; /* ToDo: panic? */
+			}
+		}
+
+		hw_cpu_num = interrupt_server[0];
+		if (hw_cpu_num != _prom->cpu) {
+			/* Primary Thread of non-boot cpu */
+			prom_printf("%x : starting cpu hw idx %x... ", cpuid, reg);
+			call_prom("start-cpu", 3, 0, node,
+				  secondary_hold, reg);
+
+			for ( i = 0 ; (i < 100000000) && 
+			      (*acknowledge == ((unsigned long)-1)); i++ )
+				mb();
+
+			if (*acknowledge == reg) {
+				prom_printf("done\n");
+				/* We have to get every CPU out of OF,
+				 * even if we never start it. */
+				if (cpuid >= NR_CPUS)
+					goto next;
+			} else {
+				prom_printf("failed: %x\n", *acknowledge);
+			}
+		}
+#ifdef CONFIG_SMP
+		else
+			prom_printf("%x : boot cpu     %x\n", cpuid, reg);
+#endif
+next:
+#ifdef CONFIG_SMP
+		/* Init paca for secondary threads.   They start later. */
+		for (i=1; i < cpu_threads; i++) {
+			cpuid++;
+			if (cpuid >= NR_CPUS)
+				continue;
+		}
+#endif /* CONFIG_SMP */
+		cpuid++;
+	}
+#ifdef CONFIG_HMT
+	/* Only enable HMT on processors that provide support. */
+	if (__is_processor(PV_PULSAR) || 
+	    __is_processor(PV_ICESTAR) ||
+	    __is_processor(PV_SSTAR)) {
+		prom_printf("    starting secondary threads\n");
+
+		for (i = 0; i < NR_CPUS; i += 2) {
+			if (!cpu_online(i))
+				continue;
+
+			if (i == 0) {
+				unsigned long pir = mfspr(SPRN_PIR);
+				if (__is_processor(PV_PULSAR)) {
+					RELOC(hmt_thread_data)[i].pir = 
+						pir & 0x1f;
+				} else {
+					RELOC(hmt_thread_data)[i].pir = 
+						pir & 0x3ff;
+				}
+			}
+		}
+	} else {
+		prom_printf("Processor is not HMT capable\n");
+	}
+#endif
+
+	if (cpuid > NR_CPUS)
+		prom_printf("WARNING: maximum CPUs (" __stringify(NR_CPUS)
+			    ") exceeded: ignoring extras\n");
+
+	prom_debug("prom_hold_cpus: end...\n");
+#endif
+}
+
+
+static void __init prom_init_client_services(unsigned long pp)
+{
+	struct prom_t *_prom = &RELOC(prom);
+
+	/* Get a handle to the prom entry point before anything else */
+	RELOC(prom_entry) = pp;
+
+	/* get a handle for the stdout device */
+	_prom->chosen = call_prom("finddevice", 1, 1, ADDR("/chosen"));
+	if (!PHANDLE_VALID(_prom->chosen))
+		prom_panic("cannot find chosen"); /* msg won't be printed :( */
+
+	/* get device tree root */
+	_prom->root = call_prom("finddevice", 1, 1, ADDR("/"));
+	if (!PHANDLE_VALID(_prom->root))
+		prom_panic("cannot find device tree root"); /* msg won't be printed :( */
+}
+
+static void __init prom_init_stdout(void)
+{
+	struct prom_t *_prom = &RELOC(prom);
+	char *path = RELOC(of_stdout_device);
+	char type[16];
+	u32 val;
+
+	if (prom_getprop(_prom->chosen, "stdout", &val, sizeof(val)) <= 0)
+		prom_panic("cannot find stdout");
+
+	_prom->stdout = val;
+
+	/* Get the full OF pathname of the stdout device */
+	memset(path, 0, 256);
+	call_prom("instance-to-path", 3, 1, _prom->stdout, path, 255);
+	val = call_prom("instance-to-package", 1, 1, _prom->stdout);
+	prom_setprop(_prom->chosen, "linux,stdout-package", &val, sizeof(val));
+	prom_printf("OF stdout device is: %s\n", RELOC(of_stdout_device));
+	prom_setprop(_prom->chosen, "linux,stdout-path",
+		     RELOC(of_stdout_device), strlen(RELOC(of_stdout_device))+1);
+
+	/* If it's a display, note it */
+	memset(type, 0, sizeof(type));
+	prom_getprop(val, "device_type", type, sizeof(type));
+	if (strcmp(type, RELOC("display")) == 0)
+		prom_setprop(val, "linux,boot-display", NULL, 0);
+}
+
+static void __init prom_close_stdin(void)
+{
+	struct prom_t *_prom = &RELOC(prom);
+	ihandle val;
+
+	if (prom_getprop(_prom->chosen, "stdin", &val, sizeof(val)) > 0)
+		call_prom("close", 1, 0, val);
+}
+
+static int __init prom_find_machine_type(void)
+{
+	struct prom_t *_prom = &RELOC(prom);
+	char compat[256];
+	int len, i = 0;
+	phandle rtas;
+
+	len = prom_getprop(_prom->root, "compatible",
+			   compat, sizeof(compat)-1);
+	if (len > 0) {
+		compat[len] = 0;
+		while (i < len) {
+			char *p = &compat[i];
+			int sl = strlen(p);
+			if (sl == 0)
+				break;
+			if (strstr(p, RELOC("Power Macintosh")) ||
+			    strstr(p, RELOC("MacRISC4")))
+				return PLATFORM_POWERMAC;
+#ifdef CONFIG_PPC64
+			if (strstr(p, RELOC("Momentum,Maple")))
+				return PLATFORM_MAPLE;
+#endif
+			i += sl + 1;
+		}
+	}
+#ifdef CONFIG_PPC64
+	/* Default to pSeries. We need to know if we are running LPAR */
+	rtas = call_prom("finddevice", 1, 1, ADDR("/rtas"));
+	if (PHANDLE_VALID(rtas)) {
+		int x = prom_getproplen(rtas, "ibm,hypertas-functions");
+		if (x != PROM_ERROR) {
+			prom_printf("Hypertas detected, assuming LPAR !\n");
+			return PLATFORM_PSERIES_LPAR;
+		}
+	}
+	return PLATFORM_PSERIES;
+#else
+	return PLATFORM_CHRP;
+#endif
+}
+
+static int __init setup_disp(phandle dp)
+{
+#if defined(CONFIG_BOOTX_TEXT) && defined(CONFIG_PPC32)
+	int width = 640, height = 480, depth = 8, pitch;
+	unsigned address;
+	u32 addrs[8][5];
+	int i, naddrs;
+	char name[32];
+	char *getprop = "getprop";
+
+	prom_printf("Initializing screen: ");
+
+	memset(name, 0, sizeof(name));
+	call_prom(getprop, 4, 1, dp, "name", name, sizeof(name));
+	name[sizeof(name)-1] = 0;
+	prom_print(name);
+	prom_print("\n");
+	call_prom(getprop, 4, 1, dp, "width", &width, sizeof(width));
+	call_prom(getprop, 4, 1, dp, "height", &height, sizeof(height));
+	call_prom(getprop, 4, 1, dp, "depth", &depth, sizeof(depth));
+	pitch = width * ((depth + 7) / 8);
+	call_prom(getprop, 4, 1, dp, "linebytes",
+		  &pitch, sizeof(pitch));
+	if (pitch == 1)
+		pitch = 0x1000;		/* for strange IBM display */
+	address = 0;
+	call_prom(getprop, 4, 1, dp, "address", &address, sizeof(address));
+	if (address == 0) {
+		/* look for an assigned address with a size of >= 1MB */
+		naddrs = call_prom(getprop, 4, 1, dp, "assigned-addresses",
+				   addrs, sizeof(addrs));
+		naddrs /= 20;
+		for (i = 0; i < naddrs; ++i) {
+			if (addrs[i][4] >= (1 << 20)) {
+				address = addrs[i][2];
+				/* use the BE aperture if possible */
+				if (addrs[i][4] >= (16 << 20))
+					address += (8 << 20);
+				break;
+			}
+		}
+		if (address == 0) {
+			prom_print("Failed to get address\n");
+			return 0;
+		}
+	}
+	/* kludge for valkyrie */
+	if (strcmp(name, "valkyrie") == 0)
+		address += 0x1000;
+
+	prom_printf("\n\n\n\naddress = %x\n", address);
+	btext_setup_display(width, height, depth, pitch, address);
+#endif /* CONFIG_BOOTX_TEXT && CONFIG_PPC32 */
+	return 1;
+}
+
+static int __init prom_set_color(ihandle ih, int i, int r, int g, int b)
+{
+	return call_prom("call-method", 6, 1, ADDR("color!"), ih, i, b, g, r);
+}
+
+/*
+ * If we have a display that we don't know how to drive,
+ * we will want to try to execute OF's open method for it
+ * later.  However, OF will probably fall over if we do that
+ * we've taken over the MMU.
+ * So we check whether we will need to open the display,
+ * and if so, open it now.
+ */
+static void __init prom_check_displays(void)
+{
+	char type[16], *path;
+	phandle node;
+	ihandle ih;
+	int i;
+	int got_display = 0;
+
+	static unsigned char default_colors[] = {
+		0x00, 0x00, 0x00,
+		0x00, 0x00, 0xaa,
+		0x00, 0xaa, 0x00,
+		0x00, 0xaa, 0xaa,
+		0xaa, 0x00, 0x00,
+		0xaa, 0x00, 0xaa,
+		0xaa, 0xaa, 0x00,
+		0xaa, 0xaa, 0xaa,
+		0x55, 0x55, 0x55,
+		0x55, 0x55, 0xff,
+		0x55, 0xff, 0x55,
+		0x55, 0xff, 0xff,
+		0xff, 0x55, 0x55,
+		0xff, 0x55, 0xff,
+		0xff, 0xff, 0x55,
+		0xff, 0xff, 0xff
+	};
+	const unsigned char *clut;
+
+	prom_printf("Looking for displays\n");
+	for (node = 0; prom_next_node(&node); ) {
+		memset(type, 0, sizeof(type));
+		prom_getprop(node, "device_type", type, sizeof(type));
+		if (strcmp(type, RELOC("display")) != 0)
+			continue;
+
+		/* It seems OF doesn't null-terminate the path :-( */
+		path = RELOC(prom_scratch);
+		memset(path, 0, PROM_SCRATCH_SIZE);
+
+		/*
+		 * leave some room at the end of the path for appending extra
+		 * arguments
+		 */
+		if (call_prom("package-to-path", 3, 1, node, path,
+			      PROM_SCRATCH_SIZE-10) == PROM_ERROR)
+			continue;
+		prom_printf("found display   : %s, opening ... ", path);
+		
+		ih = call_prom("open", 1, 1, path);
+		if (ih == 0) {
+			prom_printf("failed\n");
+			continue;
+		}
+
+		/* Success */
+		prom_printf("done\n");
+		prom_setprop(node, "linux,opened", NULL, 0);
+
+		/* Setup a usable color table when the appropriate
+		 * method is available. Should update this to set-colors */
+		clut = RELOC(default_colors);
+		for (i = 0; i < 32; i++, clut += 3)
+			if (prom_set_color(ih, i, clut[0], clut[1],
+					   clut[2]) != 0)
+				break;
+
+#ifdef CONFIG_LOGO_LINUX_CLUT224
+		clut = PTRRELOC(RELOC(logo_linux_clut224.clut));
+		for (i = 0; i < RELOC(logo_linux_clut224.clutsize); i++, clut += 3)
+			if (prom_set_color(ih, i + 32, clut[0], clut[1],
+					   clut[2]) != 0)
+				break;
+#endif /* CONFIG_LOGO_LINUX_CLUT224 */
+		if (!got_display)
+			got_display = setup_disp(node);
+	}
+}
+
+
+/* Return (relocated) pointer to this much memory: moves initrd if reqd. */
+static void __init *make_room(unsigned long *mem_start, unsigned long *mem_end,
+			      unsigned long needed, unsigned long align)
+{
+	void *ret;
+
+	*mem_start = _ALIGN(*mem_start, align);
+	while ((*mem_start + needed) > *mem_end) {
+		unsigned long room, chunk;
+
+		prom_debug("Chunk exhausted, claiming more at %x...\n",
+			   RELOC(alloc_bottom));
+		room = RELOC(alloc_top) - RELOC(alloc_bottom);
+		if (room > DEVTREE_CHUNK_SIZE)
+			room = DEVTREE_CHUNK_SIZE;
+		if (room < PAGE_SIZE)
+			prom_panic("No memory for flatten_device_tree (no room)");
+		chunk = alloc_up(room, 0);
+		if (chunk == 0)
+			prom_panic("No memory for flatten_device_tree (claim failed)");
+		*mem_end = RELOC(alloc_top);
+	}
+
+	ret = (void *)*mem_start;
+	*mem_start += needed;
+
+	return ret;
+}
+
+#define dt_push_token(token, mem_start, mem_end) \
+	do { *((u32 *)make_room(mem_start, mem_end, 4, 4)) = token; } while(0)
+
+static unsigned long __init dt_find_string(char *str)
+{
+	char *s, *os;
+
+	s = os = (char *)RELOC(dt_string_start);
+	s += 4;
+	while (s <  (char *)RELOC(dt_string_end)) {
+		if (strcmp(s, str) == 0)
+			return s - os;
+		s += strlen(s) + 1;
+	}
+	return 0;
+}
+
+/*
+ * The Open Firmware 1275 specification states properties must be 31 bytes or
+ * less, however not all firmwares obey this. Make it 64 bytes to be safe.
+ */
+#define MAX_PROPERTY_NAME 64
+
+static void __init scan_dt_build_strings(phandle node,
+					 unsigned long *mem_start,
+					 unsigned long *mem_end)
+{
+	char *prev_name, *namep, *sstart;
+	unsigned long soff;
+	phandle child;
+
+	sstart =  (char *)RELOC(dt_string_start);
+
+	/* get and store all property names */
+	prev_name = RELOC("");
+	for (;;) {
+		/* 64 is max len of name including nul. */
+		namep = make_room(mem_start, mem_end, MAX_PROPERTY_NAME, 1);
+		if (call_prom("nextprop", 3, 1, node, prev_name, namep) != 1) {
+			/* No more nodes: unwind alloc */
+			*mem_start = (unsigned long)namep;
+			break;
+		}
+
+ 		/* skip "name" */
+ 		if (strcmp(namep, RELOC("name")) == 0) {
+ 			*mem_start = (unsigned long)namep;
+ 			prev_name = RELOC("name");
+ 			continue;
+ 		}
+		/* get/create string entry */
+		soff = dt_find_string(namep);
+		if (soff != 0) {
+			*mem_start = (unsigned long)namep;
+			namep = sstart + soff;
+		} else {
+			/* Trim off some if we can */
+			*mem_start = (unsigned long)namep + strlen(namep) + 1;
+			RELOC(dt_string_end) = *mem_start;
+		}
+		prev_name = namep;
+	}
+
+	/* do all our children */
+	child = call_prom("child", 1, 1, node);
+	while (child != 0) {
+		scan_dt_build_strings(child, mem_start, mem_end);
+		child = call_prom("peer", 1, 1, child);
+	}
+}
+
+static void __init scan_dt_build_struct(phandle node, unsigned long *mem_start,
+					unsigned long *mem_end)
+{
+	phandle child;
+	char *namep, *prev_name, *sstart, *p, *ep, *lp, *path;
+	unsigned long soff;
+	unsigned char *valp;
+	static char pname[MAX_PROPERTY_NAME];
+	int l;
+
+	dt_push_token(OF_DT_BEGIN_NODE, mem_start, mem_end);
+
+	/* get the node's full name */
+	namep = (char *)*mem_start;
+	l = call_prom("package-to-path", 3, 1, node,
+		      namep, *mem_end - *mem_start);
+	if (l >= 0) {
+		/* Didn't fit?  Get more room. */
+		if ((l+1) > (*mem_end - *mem_start)) {
+			namep = make_room(mem_start, mem_end, l+1, 1);
+			call_prom("package-to-path", 3, 1, node, namep, l);
+		}
+		namep[l] = '\0';
+
+		/* Fixup an Apple bug where they have bogus \0 chars in the
+		 * middle of the path in some properties
+		 */
+		for (p = namep, ep = namep + l; p < ep; p++)
+			if (*p == '\0') {
+				memmove(p, p+1, ep - p);
+				ep--; l--; p--;
+			}
+
+		/* now try to extract the unit name in that mess */
+		for (p = namep, lp = NULL; *p; p++)
+			if (*p == '/')
+				lp = p + 1;
+		if (lp != NULL)
+			memmove(namep, lp, strlen(lp) + 1);
+		*mem_start = _ALIGN(((unsigned long) namep) +
+				    strlen(namep) + 1, 4);
+	}
+
+	/* get it again for debugging */
+	path = RELOC(prom_scratch);
+	memset(path, 0, PROM_SCRATCH_SIZE);
+	call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1);
+
+	/* get and store all properties */
+	prev_name = RELOC("");
+	sstart = (char *)RELOC(dt_string_start);
+	for (;;) {
+		if (call_prom("nextprop", 3, 1, node, prev_name,
+			      RELOC(pname)) != 1)
+			break;
+
+ 		/* skip "name" */
+ 		if (strcmp(RELOC(pname), RELOC("name")) == 0) {
+ 			prev_name = RELOC("name");
+ 			continue;
+ 		}
+
+		/* find string offset */
+		soff = dt_find_string(RELOC(pname));
+		if (soff == 0) {
+			prom_printf("WARNING: Can't find string index for"
+				    " <%s>, node %s\n", RELOC(pname), path);
+			break;
+		}
+		prev_name = sstart + soff;
+
+		/* get length */
+		l = call_prom("getproplen", 2, 1, node, RELOC(pname));
+
+		/* sanity checks */
+		if (l == PROM_ERROR)
+			continue;
+		if (l > MAX_PROPERTY_LENGTH) {
+			prom_printf("WARNING: ignoring large property ");
+			/* It seems OF doesn't null-terminate the path :-( */
+			prom_printf("[%s] ", path);
+			prom_printf("%s length 0x%x\n", RELOC(pname), l);
+			continue;
+		}
+
+		/* push property head */
+		dt_push_token(OF_DT_PROP, mem_start, mem_end);
+		dt_push_token(l, mem_start, mem_end);
+		dt_push_token(soff, mem_start, mem_end);
+
+		/* push property content */
+		valp = make_room(mem_start, mem_end, l, 4);
+		call_prom("getprop", 4, 1, node, RELOC(pname), valp, l);
+		*mem_start = _ALIGN(*mem_start, 4);
+	}
+
+	/* Add a "linux,phandle" property. */
+	soff = dt_find_string(RELOC("linux,phandle"));
+	if (soff == 0)
+		prom_printf("WARNING: Can't find string index for"
+			    " <linux-phandle> node %s\n", path);
+	else {
+		dt_push_token(OF_DT_PROP, mem_start, mem_end);
+		dt_push_token(4, mem_start, mem_end);
+		dt_push_token(soff, mem_start, mem_end);
+		valp = make_room(mem_start, mem_end, 4, 4);
+		*(u32 *)valp = node;
+	}
+
+	/* do all our children */
+	child = call_prom("child", 1, 1, node);
+	while (child != 0) {
+		scan_dt_build_struct(child, mem_start, mem_end);
+		child = call_prom("peer", 1, 1, child);
+	}
+
+	dt_push_token(OF_DT_END_NODE, mem_start, mem_end);
+}
+
+static void __init flatten_device_tree(void)
+{
+	phandle root;
+	unsigned long mem_start, mem_end, room;
+	struct boot_param_header *hdr;
+	struct prom_t *_prom = &RELOC(prom);
+	char *namep;
+	u64 *rsvmap;
+
+	/*
+	 * Check how much room we have between alloc top & bottom (+/- a
+	 * few pages), crop to 4Mb, as this is our "chuck" size
+	 */
+	room = RELOC(alloc_top) - RELOC(alloc_bottom) - 0x4000;
+	if (room > DEVTREE_CHUNK_SIZE)
+		room = DEVTREE_CHUNK_SIZE;
+	prom_debug("starting device tree allocs at %x\n", RELOC(alloc_bottom));
+
+	/* Now try to claim that */
+	mem_start = (unsigned long)alloc_up(room, PAGE_SIZE);
+	if (mem_start == 0)
+		prom_panic("Can't allocate initial device-tree chunk\n");
+	mem_end = RELOC(alloc_top);
+
+	/* Get root of tree */
+	root = call_prom("peer", 1, 1, (phandle)0);
+	if (root == (phandle)0)
+		prom_panic ("couldn't get device tree root\n");
+
+	/* Build header and make room for mem rsv map */ 
+	mem_start = _ALIGN(mem_start, 4);
+	hdr = make_room(&mem_start, &mem_end,
+			sizeof(struct boot_param_header), 4);
+	RELOC(dt_header_start) = (unsigned long)hdr;
+	rsvmap = make_room(&mem_start, &mem_end, sizeof(mem_reserve_map), 8);
+
+	/* Start of strings */
+	mem_start = PAGE_ALIGN(mem_start);
+	RELOC(dt_string_start) = mem_start;
+	mem_start += 4; /* hole */
+
+	/* Add "linux,phandle" in there, we'll need it */
+	namep = make_room(&mem_start, &mem_end, 16, 1);
+	strcpy(namep, RELOC("linux,phandle"));
+	mem_start = (unsigned long)namep + strlen(namep) + 1;
+
+	/* Build string array */
+	prom_printf("Building dt strings...\n"); 
+	scan_dt_build_strings(root, &mem_start, &mem_end);
+	RELOC(dt_string_end) = mem_start;
+
+	/* Build structure */
+	mem_start = PAGE_ALIGN(mem_start);
+	RELOC(dt_struct_start) = mem_start;
+	prom_printf("Building dt structure...\n"); 
+	scan_dt_build_struct(root, &mem_start, &mem_end);
+	dt_push_token(OF_DT_END, &mem_start, &mem_end);
+	RELOC(dt_struct_end) = PAGE_ALIGN(mem_start);
+
+	/* Finish header */
+	hdr->boot_cpuid_phys = _prom->cpu;
+	hdr->magic = OF_DT_HEADER;
+	hdr->totalsize = RELOC(dt_struct_end) - RELOC(dt_header_start);
+	hdr->off_dt_struct = RELOC(dt_struct_start) - RELOC(dt_header_start);
+	hdr->off_dt_strings = RELOC(dt_string_start) - RELOC(dt_header_start);
+	hdr->dt_strings_size = RELOC(dt_string_end) - RELOC(dt_string_start);
+	hdr->off_mem_rsvmap = ((unsigned long)rsvmap) - RELOC(dt_header_start);
+	hdr->version = OF_DT_VERSION;
+	/* Version 16 is not backward compatible */
+	hdr->last_comp_version = 0x10;
+
+	/* Reserve the whole thing and copy the reserve map in, we
+	 * also bump mem_reserve_cnt to cause further reservations to
+	 * fail since it's too late.
+	 */
+	reserve_mem(RELOC(dt_header_start), hdr->totalsize);
+	memcpy(rsvmap, RELOC(mem_reserve_map), sizeof(mem_reserve_map));
+
+#ifdef DEBUG_PROM
+	{
+		int i;
+		prom_printf("reserved memory map:\n");
+		for (i = 0; i < RELOC(mem_reserve_cnt); i++)
+			prom_printf("  %x - %x\n",
+				    RELOC(mem_reserve_map)[i].base,
+				    RELOC(mem_reserve_map)[i].size);
+	}
+#endif
+	RELOC(mem_reserve_cnt) = MEM_RESERVE_MAP_SIZE;
+
+	prom_printf("Device tree strings 0x%x -> 0x%x\n",
+		    RELOC(dt_string_start), RELOC(dt_string_end)); 
+	prom_printf("Device tree struct  0x%x -> 0x%x\n",
+		    RELOC(dt_struct_start), RELOC(dt_struct_end));
+
+}
+
+
+static void __init fixup_device_tree(void)
+{
+#if defined(CONFIG_PPC64) && defined(CONFIG_PPC_PMAC)
+	phandle u3, i2c, mpic;
+	u32 u3_rev;
+	u32 interrupts[2];
+	u32 parent;
+
+	/* Some G5s have a missing interrupt definition, fix it up here */
+	u3 = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000"));
+	if (!PHANDLE_VALID(u3))
+		return;
+	i2c = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/i2c@f8001000"));
+	if (!PHANDLE_VALID(i2c))
+		return;
+	mpic = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/mpic@f8040000"));
+	if (!PHANDLE_VALID(mpic))
+		return;
+
+	/* check if proper rev of u3 */
+	if (prom_getprop(u3, "device-rev", &u3_rev, sizeof(u3_rev))
+	    == PROM_ERROR)
+		return;
+	if (u3_rev != 0x35 && u3_rev != 0x37)
+		return;
+	/* does it need fixup ? */
+	if (prom_getproplen(i2c, "interrupts") > 0)
+		return;
+
+	prom_printf("fixing up bogus interrupts for u3 i2c...\n");
+
+	/* interrupt on this revision of u3 is number 0 and level */
+	interrupts[0] = 0;
+	interrupts[1] = 1;
+	prom_setprop(i2c, "interrupts", &interrupts, sizeof(interrupts));
+	parent = (u32)mpic;
+	prom_setprop(i2c, "interrupt-parent", &parent, sizeof(parent));
+#endif
+}
+
+
+static void __init prom_find_boot_cpu(void)
+{
+       	struct prom_t *_prom = &RELOC(prom);
+	u32 getprop_rval;
+	ihandle prom_cpu;
+	phandle cpu_pkg;
+
+	if (prom_getprop(_prom->chosen, "cpu", &prom_cpu, sizeof(prom_cpu)) <= 0)
+		prom_panic("cannot find boot cpu");
+
+	cpu_pkg = call_prom("instance-to-package", 1, 1, prom_cpu);
+
+	prom_getprop(cpu_pkg, "reg", &getprop_rval, sizeof(getprop_rval));
+	_prom->cpu = getprop_rval;
+
+	prom_debug("Booting CPU hw index = 0x%x\n", _prom->cpu);
+}
+
+static void __init prom_check_initrd(unsigned long r3, unsigned long r4)
+{
+#ifdef CONFIG_BLK_DEV_INITRD
+       	struct prom_t *_prom = &RELOC(prom);
+
+	if (r3 && r4 && r4 != 0xdeadbeef) {
+		unsigned long val;
+
+		RELOC(prom_initrd_start) = (r3 >= KERNELBASE) ? __pa(r3) : r3;
+		RELOC(prom_initrd_end) = RELOC(prom_initrd_start) + r4;
+
+		val = RELOC(prom_initrd_start);
+		prom_setprop(_prom->chosen, "linux,initrd-start", &val,
+			     sizeof(val));
+		val = RELOC(prom_initrd_end);
+		prom_setprop(_prom->chosen, "linux,initrd-end", &val,
+			     sizeof(val));
+
+		reserve_mem(RELOC(prom_initrd_start),
+			    RELOC(prom_initrd_end) - RELOC(prom_initrd_start));
+
+		prom_debug("initrd_start=0x%x\n", RELOC(prom_initrd_start));
+		prom_debug("initrd_end=0x%x\n", RELOC(prom_initrd_end));
+	}
+#endif /* CONFIG_BLK_DEV_INITRD */
+}
+
+/*
+ * We enter here early on, when the Open Firmware prom is still
+ * handling exceptions and the MMU hash table for us.
+ */
+
+unsigned long __init prom_init(unsigned long r3, unsigned long r4,
+			       unsigned long pp,
+			       unsigned long r6, unsigned long r7)
+{	
+       	struct prom_t *_prom;
+	extern char _stext[];
+	unsigned long hdr;
+	u32 getprop_rval;
+
+#ifdef CONFIG_PPC32
+	unsigned long offset = reloc_offset();
+	reloc_got2(offset);
+#endif
+
+	_prom = &RELOC(prom);
+
+	/*
+	 * First zero the BSS
+	 */
+	memset(&RELOC(__bss_start), 0, __bss_stop - __bss_start);
+
+	/*
+	 * Init interface to Open Firmware, get some node references,
+	 * like /chosen
+	 */
+	prom_init_client_services(pp);
+
+	/*
+	 * Init prom stdout device
+	 */
+	prom_init_stdout();
+
+	/*
+	 * Check for an initrd
+	 */
+	prom_check_initrd(r3, r4);
+
+	/*
+	 * Get default machine type. At this point, we do not differentiate
+	 * between pSeries SMP and pSeries LPAR
+	 */
+	RELOC(of_platform) = prom_find_machine_type();
+	getprop_rval = RELOC(of_platform);
+	prom_setprop(_prom->chosen, "linux,platform",
+		     &getprop_rval, sizeof(getprop_rval));
+
+#ifdef CONFIG_PPC_PSERIES
+	/*
+	 * On pSeries, inform the firmware about our capabilities
+	 */
+	if (RELOC(of_platform) & PLATFORM_PSERIES)
+		prom_send_capabilities();
+#endif
+
+#if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_BPA)
+	/*
+	 * On pSeries and BPA, copy the CPU hold code
+	 */
+       	if (RELOC(of_platform) & (PLATFORM_PSERIES | PLATFORM_BPA))
+       		copy_and_flush(0, KERNELBASE - offset, 0x100, 0);
+#endif
+
+	/*
+	 * Do early parsing of command line
+	 */
+	early_cmdline_parse();
+
+	/*
+	 * Initialize memory management within prom_init
+	 */
+	prom_init_mem();
+
+	/*
+	 * Determine which cpu is actually running right _now_
+	 */
+	prom_find_boot_cpu();
+
+	/* 
+	 * Initialize display devices
+	 */
+	prom_check_displays();
+
+#ifdef CONFIG_PPC64
+	/*
+	 * Initialize IOMMU (TCE tables) on pSeries. Do that before anything else
+	 * that uses the allocator, we need to make sure we get the top of memory
+	 * available for us here...
+	 */
+	if (RELOC(of_platform) == PLATFORM_PSERIES)
+		prom_initialize_tce_table();
+#endif
+
+	/*
+	 * On non-powermacs, try to instantiate RTAS and puts all CPUs
+	 * in spin-loops. PowerMacs don't have a working RTAS and use
+	 * a different way to spin CPUs
+	 */
+	if (RELOC(of_platform) != PLATFORM_POWERMAC) {
+		prom_instantiate_rtas();
+		prom_hold_cpus();
+	}
+
+	/*
+	 * Fill in some infos for use by the kernel later on
+	 */
+	if (RELOC(prom_memory_limit))
+		prom_setprop(_prom->chosen, "linux,memory-limit",
+			     &RELOC(prom_memory_limit),
+			     sizeof(prom_memory_limit));
+#ifdef CONFIG_PPC64
+	if (RELOC(ppc64_iommu_off))
+		prom_setprop(_prom->chosen, "linux,iommu-off", NULL, 0);
+
+	if (RELOC(iommu_force_on))
+		prom_setprop(_prom->chosen, "linux,iommu-force-on", NULL, 0);
+
+	if (RELOC(prom_tce_alloc_start)) {
+		prom_setprop(_prom->chosen, "linux,tce-alloc-start",
+			     &RELOC(prom_tce_alloc_start),
+			     sizeof(prom_tce_alloc_start));
+		prom_setprop(_prom->chosen, "linux,tce-alloc-end",
+			     &RELOC(prom_tce_alloc_end),
+			     sizeof(prom_tce_alloc_end));
+	}
+#endif
+
+	/*
+	 * Fixup any known bugs in the device-tree
+	 */
+	fixup_device_tree();
+
+	/*
+	 * Now finally create the flattened device-tree
+	 */
+	prom_printf("copying OF device tree ...\n");
+	flatten_device_tree();
+
+	/* in case stdin is USB and still active on IBM machines... */
+	prom_close_stdin();
+
+	/*
+	 * Call OF "quiesce" method to shut down pending DMA's from
+	 * devices etc...
+	 */
+	prom_printf("Calling quiesce ...\n");
+	call_prom("quiesce", 0, 0);
+
+	/*
+	 * And finally, call the kernel passing it the flattened device
+	 * tree and NULL as r5, thus triggering the new entry point which
+	 * is common to us and kexec
+	 */
+	hdr = RELOC(dt_header_start);
+	prom_printf("returning from prom_init\n");
+	prom_debug("->dt_header_start=0x%x\n", hdr);
+
+#ifdef CONFIG_PPC32
+	reloc_got2(-offset);
+#endif
+
+	__start(hdr, 0, 0);
+
+	return 0;
+}

arch/powerpc/kernel/setup.c

@@ -0,0 +1,678 @@
+/*
+ * Common prep/pmac/chrp boot and setup code.
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/sched.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/reboot.h>
+#include <linux/delay.h>
+#include <linux/initrd.h>
+#include <linux/ide.h>
+#include <linux/tty.h>
+#include <linux/bootmem.h>
+#include <linux/seq_file.h>
+#include <linux/root_dev.h>
+#include <linux/cpu.h>
+#include <linux/console.h>
+
+#include <asm/residual.h>
+#include <asm/io.h>
+#include <asm/prom.h>
+#include <asm/processor.h>
+#include <asm/pgtable.h>
+#include <asm/bootinfo.h>
+#include <asm/setup.h>
+#include <asm/amigappc.h>
+#include <asm/smp.h>
+#include <asm/elf.h>
+#include <asm/cputable.h>
+#include <asm/bootx.h>
+#include <asm/btext.h>
+#include <asm/machdep.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <asm/pmac_feature.h>
+#include <asm/sections.h>
+#include <asm/nvram.h>
+#include <asm/xmon.h>
+#include <asm/ocp.h>
+
+#define USES_PPC_SYS (defined(CONFIG_85xx) || defined(CONFIG_83xx) || \
+		      defined(CONFIG_MPC10X_BRIDGE) || defined(CONFIG_8260) || \
+		      defined(CONFIG_PPC_MPC52xx))
+
+#if USES_PPC_SYS
+#include <asm/ppc_sys.h>
+#endif
+
+#if defined CONFIG_KGDB
+#include <asm/kgdb.h>
+#endif
+
+extern void platform_init(void);
+extern void bootx_init(unsigned long r4, unsigned long phys);
+
+extern void ppc6xx_idle(void);
+extern void power4_idle(void);
+
+boot_infos_t *boot_infos;
+struct ide_machdep_calls ppc_ide_md;
+
+/* Used with the BI_MEMSIZE bootinfo parameter to store the memory
+   size value reported by the boot loader. */
+unsigned long boot_mem_size;
+
+unsigned long ISA_DMA_THRESHOLD;
+unsigned int DMA_MODE_READ;
+unsigned int DMA_MODE_WRITE;
+
+#ifdef CONFIG_PPC_MULTIPLATFORM
+int _machine = 0;
+
+extern void prep_init(void);
+extern void pmac_init(void);
+extern void chrp_init(void);
+
+dev_t boot_dev;
+#endif /* CONFIG_PPC_MULTIPLATFORM */
+
+#ifdef CONFIG_MAGIC_SYSRQ
+unsigned long SYSRQ_KEY = 0x54;
+#endif /* CONFIG_MAGIC_SYSRQ */
+
+#ifdef CONFIG_VGA_CONSOLE
+unsigned long vgacon_remap_base;
+#endif
+
+struct machdep_calls ppc_md;
+
+/*
+ * These are used in binfmt_elf.c to put aux entries on the stack
+ * for each elf executable being started.
+ */
+int dcache_bsize;
+int icache_bsize;
+int ucache_bsize;
+
+#if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_FB_VGA16) || \
+    defined(CONFIG_FB_VGA16_MODULE) || defined(CONFIG_FB_VESA)
+struct screen_info screen_info = {
+	0, 25,			/* orig-x, orig-y */
+	0,			/* unused */
+	0,			/* orig-video-page */
+	0,			/* orig-video-mode */
+	80,			/* orig-video-cols */
+	0,0,0,			/* ega_ax, ega_bx, ega_cx */
+	25,			/* orig-video-lines */
+	1,			/* orig-video-isVGA */
+	16			/* orig-video-points */
+};
+#endif /* CONFIG_VGA_CONSOLE || CONFIG_FB_VGA16 || CONFIG_FB_VESA */
+
+void machine_restart(char *cmd)
+{
+#ifdef CONFIG_NVRAM
+	nvram_sync();
+#endif
+	ppc_md.restart(cmd);
+}
+
+void machine_power_off(void)
+{
+#ifdef CONFIG_NVRAM
+	nvram_sync();
+#endif
+	ppc_md.power_off();
+}
+
+void machine_halt(void)
+{
+#ifdef CONFIG_NVRAM
+	nvram_sync();
+#endif
+	ppc_md.halt();
+}
+
+void (*pm_power_off)(void) = machine_power_off;
+
+#ifdef CONFIG_TAU
+extern u32 cpu_temp(unsigned long cpu);
+extern u32 cpu_temp_both(unsigned long cpu);
+#endif /* CONFIG_TAU */
+
+int show_cpuinfo(struct seq_file *m, void *v)
+{
+	int i = (int) v - 1;
+	int err = 0;
+	unsigned int pvr;
+	unsigned short maj, min;
+	unsigned long lpj;
+
+	if (i >= NR_CPUS) {
+		/* Show summary information */
+#ifdef CONFIG_SMP
+		unsigned long bogosum = 0;
+		for (i = 0; i < NR_CPUS; ++i)
+			if (cpu_online(i))
+				bogosum += cpu_data[i].loops_per_jiffy;
+		seq_printf(m, "total bogomips\t: %lu.%02lu\n",
+			   bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
+#endif /* CONFIG_SMP */
+
+		if (ppc_md.show_cpuinfo != NULL)
+			err = ppc_md.show_cpuinfo(m);
+		return err;
+	}
+
+#ifdef CONFIG_SMP
+	if (!cpu_online(i))
+		return 0;
+	pvr = cpu_data[i].pvr;
+	lpj = cpu_data[i].loops_per_jiffy;
+#else
+	pvr = mfspr(SPRN_PVR);
+	lpj = loops_per_jiffy;
+#endif
+
+	seq_printf(m, "processor\t: %d\n", i);
+	seq_printf(m, "cpu\t\t: ");
+
+	if (cur_cpu_spec->pvr_mask)
+		seq_printf(m, "%s", cur_cpu_spec->cpu_name);
+	else
+		seq_printf(m, "unknown (%08x)", pvr);
+#ifdef CONFIG_ALTIVEC
+	if (cur_cpu_spec->cpu_features & CPU_FTR_ALTIVEC)
+		seq_printf(m, ", altivec supported");
+#endif
+	seq_printf(m, "\n");
+
+#ifdef CONFIG_TAU
+	if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
+#ifdef CONFIG_TAU_AVERAGE
+		/* more straightforward, but potentially misleading */
+		seq_printf(m,  "temperature \t: %u C (uncalibrated)\n",
+			   cpu_temp(i));
+#else
+		/* show the actual temp sensor range */
+		u32 temp;
+		temp = cpu_temp_both(i);
+		seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
+			   temp & 0xff, temp >> 16);
+#endif
+	}
+#endif /* CONFIG_TAU */
+
+	if (ppc_md.show_percpuinfo != NULL) {
+		err = ppc_md.show_percpuinfo(m, i);
+		if (err)
+			return err;
+	}
+
+	/* If we are a Freescale core do a simple check so
+	 * we dont have to keep adding cases in the future */
+	if ((PVR_VER(pvr) & 0x8000) == 0x8000) {
+		maj = PVR_MAJ(pvr);
+		min = PVR_MIN(pvr);
+	} else {
+		switch (PVR_VER(pvr)) {
+			case 0x0020:	/* 403 family */
+				maj = PVR_MAJ(pvr) + 1;
+				min = PVR_MIN(pvr);
+				break;
+			case 0x1008:	/* 740P/750P ?? */
+				maj = ((pvr >> 8) & 0xFF) - 1;
+				min = pvr & 0xFF;
+				break;
+			default:
+				maj = (pvr >> 8) & 0xFF;
+				min = pvr & 0xFF;
+				break;
+		}
+	}
+
+	seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
+		   maj, min, PVR_VER(pvr), PVR_REV(pvr));
+
+	seq_printf(m, "bogomips\t: %lu.%02lu\n",
+		   lpj / (500000/HZ), (lpj / (5000/HZ)) % 100);
+
+#if USES_PPC_SYS
+	if (cur_ppc_sys_spec->ppc_sys_name)
+		seq_printf(m, "chipset\t\t: %s\n",
+			cur_ppc_sys_spec->ppc_sys_name);
+#endif
+
+#ifdef CONFIG_SMP
+	seq_printf(m, "\n");
+#endif
+
+	return 0;
+}
+
+static void *c_start(struct seq_file *m, loff_t *pos)
+{
+	int i = *pos;
+
+	return i <= NR_CPUS? (void *) (i + 1): NULL;
+}
+
+static void *c_next(struct seq_file *m, void *v, loff_t *pos)
+{
+	++*pos;
+	return c_start(m, pos);
+}
+
+static void c_stop(struct seq_file *m, void *v)
+{
+}
+
+struct seq_operations cpuinfo_op = {
+	.start =c_start,
+	.next =	c_next,
+	.stop =	c_stop,
+	.show =	show_cpuinfo,
+};
+
+/*
+ * We're called here very early in the boot.  We determine the machine
+ * type and call the appropriate low-level setup functions.
+ *  -- Cort <cort@fsmlabs.com>
+ *
+ * Note that the kernel may be running at an address which is different
+ * from the address that it was linked at, so we must use RELOC/PTRRELOC
+ * to access static data (including strings).  -- paulus
+ */
+unsigned long __init early_init(unsigned long dt_ptr)
+{
+	unsigned long offset = reloc_offset();
+
+	reloc_got2(offset);
+
+	/*
+	 * Identify the CPU type and fix up code sections
+	 * that depend on which cpu we have.
+	 */
+	identify_cpu(offset, 0);
+	do_cpu_ftr_fixups(offset);
+
+#ifdef CONFIG_BOOTX_TEXT
+	btext_prepare_BAT();
+#endif
+
+	reloc_got2(-offset);
+
+	return KERNELBASE + offset;
+}
+
+#ifdef CONFIG_PPC_OF
+/*
+ * Assume here that all clock rates are the same in a
+ * smp system.  -- Cort
+ */
+int
+of_show_percpuinfo(struct seq_file *m, int i)
+{
+	struct device_node *cpu_node;
+	u32 *fp;
+	int s;
+	
+	cpu_node = find_type_devices("cpu");
+	if (!cpu_node)
+		return 0;
+	for (s = 0; s < i && cpu_node->next; s++)
+		cpu_node = cpu_node->next;
+	fp = (u32 *)get_property(cpu_node, "clock-frequency", NULL);
+	if (fp)
+		seq_printf(m, "clock\t\t: %dMHz\n", *fp / 1000000);
+	return 0;
+}
+
+void __init
+intuit_machine_type(void)
+{
+	char *model;
+	struct device_node *root;
+	
+	/* ask the OF info if we're a chrp or pmac */
+	root = find_path_device("/");
+	if (root != 0) {
+		/* assume pmac unless proven to be chrp -- Cort */
+		_machine = _MACH_Pmac;
+		model = get_property(root, "device_type", NULL);
+		if (model && !strncmp("chrp", model, 4))
+			_machine = _MACH_chrp;
+		else {
+			model = get_property(root, "model", NULL);
+			if (model && !strncmp(model, "IBM", 3))
+				_machine = _MACH_chrp;
+		}
+	}
+}
+#endif
+
+#ifdef CONFIG_PPC_MULTIPLATFORM
+/*
+ * The PPC_MULTIPLATFORM version of platform_init...
+ */
+void __init platform_init(void)
+{
+	/* if we didn't get any bootinfo telling us what we are... */
+	if (_machine == 0) {
+		/* prep boot loader tells us if we're prep or not */
+		if ( *(unsigned long *)(KERNELBASE) == (0xdeadc0de) )
+			_machine = _MACH_prep;
+	}
+
+#ifdef CONFIG_PPC_PREP
+	/* not much more to do here, if prep */
+	if (_machine == _MACH_prep) {
+		prep_init();
+		return;
+	}
+#endif
+
+#ifdef CONFIG_ADB
+	if (strstr(cmd_line, "adb_sync")) {
+		extern int __adb_probe_sync;
+		__adb_probe_sync = 1;
+	}
+#endif /* CONFIG_ADB */
+
+	switch (_machine) {
+#ifdef CONFIG_PPC_PMAC
+	case _MACH_Pmac:
+		pmac_init();
+		break;
+#endif
+#ifdef CONFIG_PPC_CHRP
+	case _MACH_chrp:
+		chrp_init();
+		break;
+#endif
+	}
+}
+
+#ifdef CONFIG_SERIAL_CORE_CONSOLE
+extern char *of_stdout_device;
+
+static int __init set_preferred_console(void)
+{
+	struct device_node *prom_stdout;
+	char *name;
+	int offset = 0;
+
+	if (of_stdout_device == NULL)
+		return -ENODEV;
+
+	/* The user has requested a console so this is already set up. */
+	if (strstr(saved_command_line, "console="))
+		return -EBUSY;
+
+	prom_stdout = find_path_device(of_stdout_device);
+	if (!prom_stdout)
+		return -ENODEV;
+
+	name = (char *)get_property(prom_stdout, "name", NULL);
+	if (!name)
+		return -ENODEV;
+
+	if (strcmp(name, "serial") == 0) {
+		int i;
+		u32 *reg = (u32 *)get_property(prom_stdout, "reg", &i);
+		if (i > 8) {
+			switch (reg[1]) {
+				case 0x3f8:
+					offset = 0;
+					break;
+				case 0x2f8:
+					offset = 1;
+					break;
+				case 0x898:
+					offset = 2;
+					break;
+				case 0x890:
+					offset = 3;
+					break;
+				default:
+					/* We dont recognise the serial port */
+					return -ENODEV;
+			}
+		}
+	} else if (strcmp(name, "ch-a") == 0)
+		offset = 0;
+	else if (strcmp(name, "ch-b") == 0)
+		offset = 1;
+	else
+		return -ENODEV;
+	return add_preferred_console("ttyS", offset, NULL);
+}
+console_initcall(set_preferred_console);
+#endif /* CONFIG_SERIAL_CORE_CONSOLE */
+#endif /* CONFIG_PPC_MULTIPLATFORM */
+
+struct bi_record *find_bootinfo(void)
+{
+	struct bi_record *rec;
+
+	rec = (struct bi_record *)_ALIGN((ulong)__bss_start+(1<<20)-1,(1<<20));
+	if ( rec->tag != BI_FIRST ) {
+		/*
+		 * This 0x10000 offset is a terrible hack but it will go away when
+		 * we have the bootloader handle all the relocation and
+		 * prom calls -- Cort
+		 */
+		rec = (struct bi_record *)_ALIGN((ulong)__bss_start+0x10000+(1<<20)-1,(1<<20));
+		if ( rec->tag != BI_FIRST )
+			return NULL;
+	}
+	return rec;
+}
+
+/*
+ * Find out what kind of machine we're on and save any data we need
+ * from the early boot process (devtree is copied on pmac by prom_init()).
+ * This is called very early on the boot process, after a minimal
+ * MMU environment has been set up but before MMU_init is called.
+ */
+void __init machine_init(unsigned long dt_ptr, unsigned long phys)
+{
+	early_init_devtree(__va(dt_ptr));
+
+#ifdef CONFIG_CMDLINE
+	strlcpy(cmd_line, CONFIG_CMDLINE, sizeof(cmd_line));
+#endif /* CONFIG_CMDLINE */
+
+#ifdef CONFIG_6xx
+	ppc_md.power_save = ppc6xx_idle;
+#endif
+#ifdef CONFIG_POWER4
+	ppc_md.power_save = power4_idle;
+#endif
+
+	platform_init();
+
+	if (ppc_md.progress)
+		ppc_md.progress("id mach(): done", 0x200);
+}
+
+#ifdef CONFIG_BOOKE_WDT
+/* Checks wdt=x and wdt_period=xx command-line option */
+int __init early_parse_wdt(char *p)
+{
+	if (p && strncmp(p, "0", 1) != 0)
+	       booke_wdt_enabled = 1;
+
+	return 0;
+}
+early_param("wdt", early_parse_wdt);
+
+int __init early_parse_wdt_period (char *p)
+{
+	if (p)
+		booke_wdt_period = simple_strtoul(p, NULL, 0);
+
+	return 0;
+}
+early_param("wdt_period", early_parse_wdt_period);
+#endif	/* CONFIG_BOOKE_WDT */
+
+/* Checks "l2cr=xxxx" command-line option */
+int __init ppc_setup_l2cr(char *str)
+{
+	if (cpu_has_feature(CPU_FTR_L2CR)) {
+		unsigned long val = simple_strtoul(str, NULL, 0);
+		printk(KERN_INFO "l2cr set to %lx\n", val);
+		_set_L2CR(0);		/* force invalidate by disable cache */
+		_set_L2CR(val);		/* and enable it */
+	}
+	return 1;
+}
+__setup("l2cr=", ppc_setup_l2cr);
+
+#ifdef CONFIG_GENERIC_NVRAM
+
+/* Generic nvram hooks used by drivers/char/gen_nvram.c */
+unsigned char nvram_read_byte(int addr)
+{
+	if (ppc_md.nvram_read_val)
+		return ppc_md.nvram_read_val(addr);
+	return 0xff;
+}
+EXPORT_SYMBOL(nvram_read_byte);
+
+void nvram_write_byte(unsigned char val, int addr)
+{
+	if (ppc_md.nvram_write_val)
+		ppc_md.nvram_write_val(addr, val);
+}
+EXPORT_SYMBOL(nvram_write_byte);
+
+void nvram_sync(void)
+{
+	if (ppc_md.nvram_sync)
+		ppc_md.nvram_sync();
+}
+EXPORT_SYMBOL(nvram_sync);
+
+#endif /* CONFIG_NVRAM */
+
+static struct cpu cpu_devices[NR_CPUS];
+
+int __init ppc_init(void)
+{
+	int i;
+
+	/* clear the progress line */
+	if ( ppc_md.progress ) ppc_md.progress("             ", 0xffff);
+
+	/* register CPU devices */
+	for (i = 0; i < NR_CPUS; i++)
+		if (cpu_possible(i))
+			register_cpu(&cpu_devices[i], i, NULL);
+
+	/* call platform init */
+	if (ppc_md.init != NULL) {
+		ppc_md.init();
+	}
+	return 0;
+}
+
+arch_initcall(ppc_init);
+
+/* Warning, IO base is not yet inited */
+void __init setup_arch(char **cmdline_p)
+{
+	extern char *klimit;
+	extern void do_init_bootmem(void);
+
+	/* so udelay does something sensible, assume <= 1000 bogomips */
+	loops_per_jiffy = 500000000 / HZ;
+
+#ifdef CONFIG_BOOTX_TEXT
+	map_boot_text();
+#endif
+
+	unflatten_device_tree();
+	finish_device_tree();
+
+#ifdef CONFIG_PPC_MULTIPLATFORM
+	/* This could be called "early setup arch", it must be done
+	 * now because xmon need it
+	 */
+	if (_machine == _MACH_Pmac)
+		pmac_feature_init();	/* New cool way */
+#endif
+
+#ifdef CONFIG_XMON
+	xmon_map_scc();
+	if (strstr(cmd_line, "xmon"))
+		xmon(NULL);
+#endif /* CONFIG_XMON */
+	if ( ppc_md.progress ) ppc_md.progress("setup_arch: enter", 0x3eab);
+
+#if defined(CONFIG_KGDB)
+	if (ppc_md.kgdb_map_scc)
+		ppc_md.kgdb_map_scc();
+	set_debug_traps();
+	if (strstr(cmd_line, "gdb")) {
+		if (ppc_md.progress)
+			ppc_md.progress("setup_arch: kgdb breakpoint", 0x4000);
+		printk("kgdb breakpoint activated\n");
+		breakpoint();
+	}
+#endif
+
+	/*
+	 * Set cache line size based on type of cpu as a default.
+	 * Systems with OF can look in the properties on the cpu node(s)
+	 * for a possibly more accurate value.
+	 */
+	if (cpu_has_feature(CPU_FTR_SPLIT_ID_CACHE)) {
+		dcache_bsize = cur_cpu_spec->dcache_bsize;
+		icache_bsize = cur_cpu_spec->icache_bsize;
+		ucache_bsize = 0;
+	} else
+		ucache_bsize = dcache_bsize = icache_bsize
+			= cur_cpu_spec->dcache_bsize;
+
+	/* reboot on panic */
+	panic_timeout = 180;
+
+	init_mm.start_code = PAGE_OFFSET;
+	init_mm.end_code = (unsigned long) _etext;
+	init_mm.end_data = (unsigned long) _edata;
+	init_mm.brk = (unsigned long) klimit;
+
+	/* Save unparsed command line copy for /proc/cmdline */
+	strlcpy(saved_command_line, cmd_line, COMMAND_LINE_SIZE);
+	*cmdline_p = cmd_line;
+
+	parse_early_param();
+
+	/* set up the bootmem stuff with available memory */
+	do_init_bootmem();
+	if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab);
+
+#ifdef CONFIG_PPC_OCP
+	/* Initialize OCP device list */
+	ocp_early_init();
+	if ( ppc_md.progress ) ppc_md.progress("ocp: exit", 0x3eab);
+#endif
+
+#ifdef CONFIG_DUMMY_CONSOLE
+	conswitchp = &dummy_con;
+#endif
+
+	ppc_md.setup_arch();
+	if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab);
+
+	paging_init();
+
+	/* this is for modules since _machine can be a define -- Cort */
+	ppc_md.ppc_machine = _machine;
+}

arch/powerpc/platforms/powermac/pmac_setup.c

@@ -101,6 +101,8 @@ int ppc_override_l2cr = 0;
 int ppc_override_l2cr_value;
 int has_l2cache = 0;
 
+int pmac_newworld = 1;
+
 static int current_root_goodness = -1;
 
 extern int pmac_newworld;
@@ -355,8 +357,8 @@ static void __init ohare_init(void)
 	}
 }
 
-extern char *bootpath;
-extern char *bootdevice;
+char *bootpath;
+char *bootdevice;
 void *boot_host;
 int boot_target;
 int boot_part;
@@ -391,6 +393,7 @@ note_scsi_host(struct device_node *node, void *host)
 		}
 	}
 }
+EXPORT_SYMBOL(note_scsi_host);
 #endif
 
 #if defined(CONFIG_BLK_DEV_IDE) && defined(CONFIG_BLK_DEV_IDE_PMAC)
@@ -565,9 +568,7 @@ pmac_halt(void)
 	pmac_power_off();
 }
 
-void __init
-pmac_init(unsigned long r3, unsigned long r4, unsigned long r5,
-	  unsigned long r6, unsigned long r7)
+void __init pmac_init(void)
 {
 	/* isa_io_base gets set in pmac_find_bridges */
 	isa_mem_base = PMAC_ISA_MEM_BASE;

include/asm-powerpc/cputable.h

@@ -57,6 +57,9 @@ struct cpu_spec {
 
 extern struct cpu_spec		*cur_cpu_spec;
 
+extern void identify_cpu(unsigned long offset, unsigned long cpu);
+extern void do_cpu_ftr_fixups(unsigned long offset);
+
 #endif /* __ASSEMBLY__ */
 
 /* CPU kernel features */

include/asm-powerpc/iommu.h

@@ -0,0 +1,112 @@
+/*
+ * Copyright (C) 2001 Mike Corrigan & Dave Engebretsen, IBM Corporation
+ * Rewrite, cleanup:
+ * Copyright (C) 2004 Olof Johansson <olof@austin.ibm.com>, IBM Corporation
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ */
+
+#ifndef _ASM_IOMMU_H
+#define _ASM_IOMMU_H
+
+#include <asm/types.h>
+#include <linux/spinlock.h>
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+
+/*
+ * IOMAP_MAX_ORDER defines the largest contiguous block
+ * of dma space we can get.  IOMAP_MAX_ORDER = 13
+ * allows up to 2**12 pages (4096 * 4096) = 16 MB
+ */
+#define IOMAP_MAX_ORDER 13
+
+struct iommu_table {
+	unsigned long  it_busno;     /* Bus number this table belongs to */
+	unsigned long  it_size;      /* Size of iommu table in entries */
+	unsigned long  it_offset;    /* Offset into global table */
+	unsigned long  it_base;      /* mapped address of tce table */
+	unsigned long  it_index;     /* which iommu table this is */
+	unsigned long  it_type;      /* type: PCI or Virtual Bus */
+	unsigned long  it_blocksize; /* Entries in each block (cacheline) */
+	unsigned long  it_hint;      /* Hint for next alloc */
+	unsigned long  it_largehint; /* Hint for large allocs */
+	unsigned long  it_halfpoint; /* Breaking point for small/large allocs */
+	spinlock_t     it_lock;      /* Protects it_map */
+	unsigned long *it_map;       /* A simple allocation bitmap for now */
+};
+
+struct scatterlist;
+struct device_node;
+
+#ifdef CONFIG_PPC_MULTIPLATFORM
+
+/* Walks all buses and creates iommu tables */
+extern void iommu_setup_pSeries(void);
+extern void iommu_setup_u3(void);
+
+/* Frees table for an individual device node */
+extern void iommu_free_table(struct device_node *dn);
+
+#endif /* CONFIG_PPC_MULTIPLATFORM */
+
+#ifdef CONFIG_PPC_PSERIES
+
+/* Creates table for an individual device node */
+extern void iommu_devnode_init_pSeries(struct device_node *dn);
+
+#endif /* CONFIG_PPC_PSERIES */
+
+#ifdef CONFIG_PPC_ISERIES
+
+/* Creates table for an individual device node */
+extern void iommu_devnode_init_iSeries(struct device_node *dn);
+
+#endif /* CONFIG_PPC_ISERIES */
+
+/* Initializes an iommu_table based in values set in the passed-in
+ * structure
+ */
+extern struct iommu_table *iommu_init_table(struct iommu_table * tbl);
+
+extern int iommu_map_sg(struct device *dev, struct iommu_table *tbl,
+		struct scatterlist *sglist, int nelems,
+		enum dma_data_direction direction);
+extern void iommu_unmap_sg(struct iommu_table *tbl, struct scatterlist *sglist,
+		int nelems, enum dma_data_direction direction);
+
+extern void *iommu_alloc_coherent(struct iommu_table *tbl, size_t size,
+		dma_addr_t *dma_handle, unsigned int __nocast flag);
+extern void iommu_free_coherent(struct iommu_table *tbl, size_t size,
+		void *vaddr, dma_addr_t dma_handle);
+extern dma_addr_t iommu_map_single(struct iommu_table *tbl, void *vaddr,
+		size_t size, enum dma_data_direction direction);
+extern void iommu_unmap_single(struct iommu_table *tbl, dma_addr_t dma_handle,
+		size_t size, enum dma_data_direction direction);
+
+extern void iommu_init_early_pSeries(void);
+extern void iommu_init_early_iSeries(void);
+extern void iommu_init_early_u3(void);
+
+#ifdef CONFIG_PCI
+extern void pci_iommu_init(void);
+extern void pci_direct_iommu_init(void);
+#else
+static inline void pci_iommu_init(void) { }
+#endif
+
+extern void alloc_u3_dart_table(void);
+
+#endif /* _ASM_IOMMU_H */

include/asm-powerpc/lmb.h

@@ -0,0 +1,81 @@
+#ifndef _PPC64_LMB_H
+#define _PPC64_LMB_H
+
+/*
+ * Definitions for talking to the Open Firmware PROM on
+ * Power Macintosh computers.
+ *
+ * Copyright (C) 2001 Peter Bergner, IBM Corp.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/init.h>
+#include <asm/prom.h>
+
+#define MAX_LMB_REGIONS 128
+
+#define LMB_ALLOC_ANYWHERE	0
+
+struct lmb_property {
+	unsigned long base;
+	unsigned long size;
+};
+
+struct lmb_region {
+	unsigned long cnt;
+	unsigned long size;
+	struct lmb_property region[MAX_LMB_REGIONS+1];
+};
+
+struct lmb {
+	unsigned long debug;
+	unsigned long rmo_size;
+	struct lmb_region memory;
+	struct lmb_region reserved;
+};
+
+extern struct lmb lmb;
+
+extern void __init lmb_init(void);
+extern void __init lmb_analyze(void);
+extern long __init lmb_add(unsigned long, unsigned long);
+extern long __init lmb_reserve(unsigned long, unsigned long);
+extern unsigned long __init lmb_alloc(unsigned long, unsigned long);
+extern unsigned long __init lmb_alloc_base(unsigned long, unsigned long,
+					   unsigned long);
+extern unsigned long __init lmb_phys_mem_size(void);
+extern unsigned long __init lmb_end_of_DRAM(void);
+extern unsigned long __init lmb_abs_to_phys(unsigned long);
+extern void __init lmb_enforce_memory_limit(unsigned long);
+
+extern void lmb_dump_all(void);
+
+extern unsigned long io_hole_start;
+
+static inline unsigned long
+lmb_size_bytes(struct lmb_region *type, unsigned long region_nr)
+{
+	return type->region[region_nr].size;
+}
+static inline unsigned long
+lmb_size_pages(struct lmb_region *type, unsigned long region_nr)
+{
+	return lmb_size_bytes(type, region_nr) >> PAGE_SHIFT;
+}
+static inline unsigned long
+lmb_start_pfn(struct lmb_region *type, unsigned long region_nr)
+{
+	return type->region[region_nr].base >> PAGE_SHIFT;
+}
+static inline unsigned long
+lmb_end_pfn(struct lmb_region *type, unsigned long region_nr)
+{
+	return lmb_start_pfn(type, region_nr) +
+	       lmb_size_pages(type, region_nr);
+}
+
+#endif /* _PPC64_LMB_H */

include/asm-powerpc/pSeries_reconfig.h

@@ -0,0 +1,25 @@
+#ifndef _PPC64_PSERIES_RECONFIG_H
+#define _PPC64_PSERIES_RECONFIG_H
+
+#include <linux/notifier.h>
+
+/*
+ * Use this API if your code needs to know about OF device nodes being
+ * added or removed on pSeries systems.
+ */
+
+#define PSERIES_RECONFIG_ADD    0x0001
+#define PSERIES_RECONFIG_REMOVE 0x0002
+
+#ifdef CONFIG_PPC_PSERIES
+extern int pSeries_reconfig_notifier_register(struct notifier_block *);
+extern void pSeries_reconfig_notifier_unregister(struct notifier_block *);
+#else /* !CONFIG_PPC_PSERIES */
+static inline int pSeries_reconfig_notifier_register(struct notifier_block *nb)
+{
+	return 0;
+}
+static inline void pSeries_reconfig_notifier_unregister(struct notifier_block *nb) { }
+#endif /* CONFIG_PPC_PSERIES */
+
+#endif /* _PPC64_PSERIES_RECONFIG_H */

include/asm-powerpc/prom.h

@@ -0,0 +1,215 @@
+#ifndef _POWERPC_PROM_H
+#define _POWERPC_PROM_H
+#ifdef __KERNEL__
+
+/*
+ * Definitions for talking to the Open Firmware PROM on
+ * Power Macintosh computers.
+ *
+ * Copyright (C) 1996-2005 Paul Mackerras.
+ *
+ * Updates for PPC64 by Peter Bergner & David Engebretsen, IBM Corp.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+#include <linux/types.h>
+#include <linux/proc_fs.h>
+#include <asm/atomic.h>
+
+/* Definitions used by the flattened device tree */
+#define OF_DT_HEADER		0xd00dfeed	/* marker */
+#define OF_DT_BEGIN_NODE	0x1		/* Start of node, full name */
+#define OF_DT_END_NODE		0x2		/* End node */
+#define OF_DT_PROP		0x3		/* Property: name off, size,
+						 * content */
+#define OF_DT_NOP		0x4		/* nop */
+#define OF_DT_END		0x9
+
+#define OF_DT_VERSION		0x10
+
+/*
+ * This is what gets passed to the kernel by prom_init or kexec
+ *
+ * The dt struct contains the device tree structure, full pathes and
+ * property contents. The dt strings contain a separate block with just
+ * the strings for the property names, and is fully page aligned and
+ * self contained in a page, so that it can be kept around by the kernel,
+ * each property name appears only once in this page (cheap compression)
+ *
+ * the mem_rsvmap contains a map of reserved ranges of physical memory,
+ * passing it here instead of in the device-tree itself greatly simplifies
+ * the job of everybody. It's just a list of u64 pairs (base/size) that
+ * ends when size is 0
+ */
+struct boot_param_header
+{
+	u32	magic;			/* magic word OF_DT_HEADER */
+	u32	totalsize;		/* total size of DT block */
+	u32	off_dt_struct;		/* offset to structure */
+	u32	off_dt_strings;		/* offset to strings */
+	u32	off_mem_rsvmap;		/* offset to memory reserve map */
+	u32	version;		/* format version */
+	u32	last_comp_version;	/* last compatible version */
+	/* version 2 fields below */
+	u32	boot_cpuid_phys;	/* Physical CPU id we're booting on */
+	/* version 3 fields below */
+	u32	dt_strings_size;	/* size of the DT strings block */
+};
+
+
+
+typedef u32 phandle;
+typedef u32 ihandle;
+
+struct address_range {
+	unsigned long space;
+	unsigned long address;
+	unsigned long size;
+};
+
+struct interrupt_info {
+	int	line;
+	int	sense;		/* +ve/-ve logic, edge or level, etc. */
+};
+
+struct pci_address {
+	u32 a_hi;
+	u32 a_mid;
+	u32 a_lo;
+};
+
+struct isa_address {
+	u32 a_hi;
+	u32 a_lo;
+};
+
+struct isa_range {
+	struct isa_address isa_addr;
+	struct pci_address pci_addr;
+	unsigned int size;
+};
+
+struct reg_property {
+	unsigned long address;
+	unsigned long size;
+};
+
+struct reg_property32 {
+	unsigned int address;
+	unsigned int size;
+};
+
+struct reg_property64 {
+	unsigned long address;
+	unsigned long size;
+};
+
+struct property {
+	char	*name;
+	int	length;
+	unsigned char *value;
+	struct property *next;
+};
+
+struct device_node {
+	char	*name;
+	char	*type;
+	phandle	node;
+	phandle linux_phandle;
+	int	n_addrs;
+	struct	address_range *addrs;
+	int	n_intrs;
+	struct	interrupt_info *intrs;
+	char	*full_name;
+
+	struct	property *properties;
+	struct	device_node *parent;
+	struct	device_node *child;
+	struct	device_node *sibling;
+	struct	device_node *next;	/* next device of same type */
+	struct	device_node *allnext;	/* next in list of all nodes */
+	struct  proc_dir_entry *pde;	/* this node's proc directory */
+	struct  kref kref;
+	unsigned long _flags;
+	void	*data;
+};
+
+extern struct device_node *of_chosen;
+
+/* flag descriptions */
+#define OF_DYNAMIC 1 /* node and properties were allocated via kmalloc */
+
+#define OF_IS_DYNAMIC(x) test_bit(OF_DYNAMIC, &x->_flags)
+#define OF_MARK_DYNAMIC(x) set_bit(OF_DYNAMIC, &x->_flags)
+
+#define HAVE_ARCH_DEVTREE_FIXUPS
+
+static inline void set_node_proc_entry(struct device_node *dn, struct proc_dir_entry *de)
+{
+	dn->pde = de;
+}
+
+
+/* OBSOLETE: Old style node lookup */
+extern struct device_node *find_devices(const char *name);
+extern struct device_node *find_type_devices(const char *type);
+extern struct device_node *find_path_device(const char *path);
+extern struct device_node *find_compatible_devices(const char *type,
+						   const char *compat);
+extern struct device_node *find_all_nodes(void);
+
+/* New style node lookup */
+extern struct device_node *of_find_node_by_name(struct device_node *from,
+	const char *name);
+extern struct device_node *of_find_node_by_type(struct device_node *from,
+	const char *type);
+extern struct device_node *of_find_compatible_node(struct device_node *from,
+	const char *type, const char *compat);
+extern struct device_node *of_find_node_by_path(const char *path);
+extern struct device_node *of_find_node_by_phandle(phandle handle);
+extern struct device_node *of_find_all_nodes(struct device_node *prev);
+extern struct device_node *of_get_parent(const struct device_node *node);
+extern struct device_node *of_get_next_child(const struct device_node *node,
+					     struct device_node *prev);
+extern struct device_node *of_node_get(struct device_node *node);
+extern void of_node_put(struct device_node *node);
+
+/* For updating the device tree at runtime */
+extern void of_attach_node(struct device_node *);
+extern void of_detach_node(const struct device_node *);
+
+/* Other Prototypes */
+extern void finish_device_tree(void);
+extern void unflatten_device_tree(void);
+extern void early_init_devtree(void *);
+extern int device_is_compatible(struct device_node *device, const char *);
+extern int machine_is_compatible(const char *compat);
+extern unsigned char *get_property(struct device_node *node, const char *name,
+				   int *lenp);
+extern void print_properties(struct device_node *node);
+extern int prom_n_addr_cells(struct device_node* np);
+extern int prom_n_size_cells(struct device_node* np);
+extern int prom_n_intr_cells(struct device_node* np);
+extern void prom_get_irq_senses(unsigned char *senses, int off, int max);
+extern void prom_add_property(struct device_node* np, struct property* prop);
+
+/*
+ * PCI <-> OF matching functions
+ * (XXX should these be here?)
+ */
+struct pci_bus;
+struct pci_dev;
+extern int pci_device_from_OF_node(struct device_node *node,
+				   u8* bus, u8* devfn);
+extern struct device_node* pci_busdev_to_OF_node(struct pci_bus *, int);
+extern struct device_node* pci_device_to_OF_node(struct pci_dev *);
+extern void pci_create_OF_bus_map(void);
+extern struct resource *request_OF_resource(struct device_node* node,
+				int index, const char* name_postfix);
+extern int release_OF_resource(struct device_node* node, int index);
+
+#endif /* __KERNEL__ */
+#endif /* _POWERPC_PROM_H */

include/asm-powerpc/rtas.h

@@ -0,0 +1,249 @@
+#ifndef _POWERPC_RTAS_H
+#define _POWERPC_RTAS_H
+
+#include <linux/spinlock.h>
+#include <asm/page.h>
+
+/*
+ * Definitions for talking to the RTAS on CHRP machines.
+ *
+ * Copyright (C) 2001 Peter Bergner
+ * Copyright (C) 2001 PPC 64 Team, IBM Corp
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#define RTAS_UNKNOWN_SERVICE (-1)
+#define RTAS_INSTANTIATE_MAX (1UL<<30) /* Don't instantiate rtas at/above this value */
+
+/* Buffer size for ppc_rtas system call. */
+#define RTAS_RMOBUF_MAX (64 * 1024)
+
+/* RTAS return status codes */
+#define RTAS_BUSY		-2    /* RTAS Busy */
+#define RTAS_EXTENDED_DELAY_MIN	9900
+#define RTAS_EXTENDED_DELAY_MAX	9905
+
+/*
+ * In general to call RTAS use rtas_token("string") to lookup
+ * an RTAS token for the given string (e.g. "event-scan").
+ * To actually perform the call use
+ *    ret = rtas_call(token, n_in, n_out, ...)
+ * Where n_in is the number of input parameters and
+ *       n_out is the number of output parameters
+ *
+ * If the "string" is invalid on this system, RTAS_UNKNOWN_SERVICE
+ * will be returned as a token.  rtas_call() does look for this
+ * token and error out gracefully so rtas_call(rtas_token("str"), ...)
+ * may be safely used for one-shot calls to RTAS.
+ *
+ */
+
+typedef u32 rtas_arg_t;
+
+struct rtas_args {
+	u32 token;
+	u32 nargs;
+	u32 nret; 
+	rtas_arg_t args[16];
+	rtas_arg_t *rets;     /* Pointer to return values in args[]. */
+};  
+
+extern struct rtas_args rtas_stop_self_args;
+
+struct rtas_t {
+	unsigned long entry;		/* physical address pointer */
+	unsigned long base;		/* physical address pointer */
+	unsigned long size;
+	spinlock_t lock;
+	struct rtas_args args;
+	struct device_node *dev;	/* virtual address pointer */
+};
+
+/* RTAS event classes */
+#define RTAS_INTERNAL_ERROR		0x80000000 /* set bit 0 */
+#define RTAS_EPOW_WARNING		0x40000000 /* set bit 1 */
+#define RTAS_POWERMGM_EVENTS		0x20000000 /* set bit 2 */
+#define RTAS_HOTPLUG_EVENTS		0x10000000 /* set bit 3 */
+#define RTAS_EVENT_SCAN_ALL_EVENTS	0xf0000000
+
+/* RTAS event severity */
+#define RTAS_SEVERITY_FATAL		0x5
+#define RTAS_SEVERITY_ERROR		0x4
+#define RTAS_SEVERITY_ERROR_SYNC	0x3
+#define RTAS_SEVERITY_WARNING		0x2
+#define RTAS_SEVERITY_EVENT		0x1
+#define RTAS_SEVERITY_NO_ERROR		0x0
+
+/* RTAS event disposition */
+#define RTAS_DISP_FULLY_RECOVERED	0x0
+#define RTAS_DISP_LIMITED_RECOVERY	0x1
+#define RTAS_DISP_NOT_RECOVERED		0x2
+
+/* RTAS event initiator */
+#define RTAS_INITIATOR_UNKNOWN		0x0
+#define RTAS_INITIATOR_CPU		0x1
+#define RTAS_INITIATOR_PCI		0x2
+#define RTAS_INITIATOR_ISA		0x3
+#define RTAS_INITIATOR_MEMORY		0x4
+#define RTAS_INITIATOR_POWERMGM		0x5
+
+/* RTAS event target */
+#define RTAS_TARGET_UNKNOWN		0x0
+#define RTAS_TARGET_CPU			0x1
+#define RTAS_TARGET_PCI			0x2
+#define RTAS_TARGET_ISA			0x3
+#define RTAS_TARGET_MEMORY		0x4
+#define RTAS_TARGET_POWERMGM		0x5
+
+/* RTAS event type */
+#define RTAS_TYPE_RETRY			0x01
+#define RTAS_TYPE_TCE_ERR		0x02
+#define RTAS_TYPE_INTERN_DEV_FAIL	0x03
+#define RTAS_TYPE_TIMEOUT		0x04
+#define RTAS_TYPE_DATA_PARITY		0x05
+#define RTAS_TYPE_ADDR_PARITY		0x06
+#define RTAS_TYPE_CACHE_PARITY		0x07
+#define RTAS_TYPE_ADDR_INVALID		0x08
+#define RTAS_TYPE_ECC_UNCORR		0x09
+#define RTAS_TYPE_ECC_CORR		0x0a
+#define RTAS_TYPE_EPOW			0x40
+#define RTAS_TYPE_PLATFORM		0xE0
+#define RTAS_TYPE_IO			0xE1
+#define RTAS_TYPE_INFO			0xE2
+#define RTAS_TYPE_DEALLOC		0xE3
+#define RTAS_TYPE_DUMP			0xE4
+/* I don't add PowerMGM events right now, this is a different topic */ 
+#define RTAS_TYPE_PMGM_POWER_SW_ON	0x60
+#define RTAS_TYPE_PMGM_POWER_SW_OFF	0x61
+#define RTAS_TYPE_PMGM_LID_OPEN		0x62
+#define RTAS_TYPE_PMGM_LID_CLOSE	0x63
+#define RTAS_TYPE_PMGM_SLEEP_BTN	0x64
+#define RTAS_TYPE_PMGM_WAKE_BTN		0x65
+#define RTAS_TYPE_PMGM_BATTERY_WARN	0x66
+#define RTAS_TYPE_PMGM_BATTERY_CRIT	0x67
+#define RTAS_TYPE_PMGM_SWITCH_TO_BAT	0x68
+#define RTAS_TYPE_PMGM_SWITCH_TO_AC	0x69
+#define RTAS_TYPE_PMGM_KBD_OR_MOUSE	0x6a
+#define RTAS_TYPE_PMGM_ENCLOS_OPEN	0x6b
+#define RTAS_TYPE_PMGM_ENCLOS_CLOSED	0x6c
+#define RTAS_TYPE_PMGM_RING_INDICATE	0x6d
+#define RTAS_TYPE_PMGM_LAN_ATTENTION	0x6e
+#define RTAS_TYPE_PMGM_TIME_ALARM	0x6f
+#define RTAS_TYPE_PMGM_CONFIG_CHANGE	0x70
+#define RTAS_TYPE_PMGM_SERVICE_PROC	0x71
+
+struct rtas_error_log {
+	unsigned long version:8;		/* Architectural version */
+	unsigned long severity:3;		/* Severity level of error */
+	unsigned long disposition:2;		/* Degree of recovery */
+	unsigned long extended:1;		/* extended log present? */
+	unsigned long /* reserved */ :2;	/* Reserved for future use */
+	unsigned long initiator:4;		/* Initiator of event */
+	unsigned long target:4;			/* Target of failed operation */
+	unsigned long type:8;			/* General event or error*/
+	unsigned long extended_log_length:32;	/* length in bytes */
+	unsigned char buffer[1];
+};
+
+struct flash_block {
+	char *data;
+	unsigned long length;
+};
+
+/* This struct is very similar but not identical to
+ * that needed by the rtas flash update.
+ * All we need to do for rtas is rewrite num_blocks
+ * into a version/length and translate the pointers
+ * to absolute.
+ */
+#define FLASH_BLOCKS_PER_NODE ((PAGE_SIZE - 16) / sizeof(struct flash_block))
+struct flash_block_list {
+	unsigned long num_blocks;
+	struct flash_block_list *next;
+	struct flash_block blocks[FLASH_BLOCKS_PER_NODE];
+};
+struct flash_block_list_header { /* just the header of flash_block_list */
+	unsigned long num_blocks;
+	struct flash_block_list *next;
+};
+extern struct flash_block_list_header rtas_firmware_flash_list;
+
+extern struct rtas_t rtas;
+
+extern void enter_rtas(unsigned long);
+extern int rtas_token(const char *service);
+extern int rtas_call(int token, int, int, int *, ...);
+extern void call_rtas_display_status(unsigned char);
+extern void rtas_restart(char *cmd);
+extern void rtas_power_off(void);
+extern void rtas_halt(void);
+extern void rtas_os_term(char *str);
+extern int rtas_get_sensor(int sensor, int index, int *state);
+extern int rtas_get_power_level(int powerdomain, int *level);
+extern int rtas_set_power_level(int powerdomain, int level, int *setlevel);
+extern int rtas_set_indicator(int indicator, int index, int new_value);
+extern void rtas_progress(char *s, unsigned short hex);
+extern void rtas_initialize(void);
+
+struct rtc_time;
+extern void rtas_get_boot_time(struct rtc_time *rtc_time);
+extern void rtas_get_rtc_time(struct rtc_time *rtc_time);
+extern int rtas_set_rtc_time(struct rtc_time *rtc_time);
+
+/* Given an RTAS status code of 9900..9905 compute the hinted delay */
+unsigned int rtas_extended_busy_delay_time(int status);
+static inline int rtas_is_extended_busy(int status)
+{
+	return status >= 9900 && status <= 9909;
+}
+
+extern void pSeries_log_error(char *buf, unsigned int err_type, int fatal);
+
+/* Error types logged.  */
+#define ERR_FLAG_ALREADY_LOGGED	0x0
+#define ERR_FLAG_BOOT		0x1 	/* log was pulled from NVRAM on boot */
+#define ERR_TYPE_RTAS_LOG	0x2	/* from rtas event-scan */
+#define ERR_TYPE_KERNEL_PANIC	0x4	/* from panic() */
+
+/* All the types and not flags */
+#define ERR_TYPE_MASK	(ERR_TYPE_RTAS_LOG | ERR_TYPE_KERNEL_PANIC)
+
+#define RTAS_DEBUG KERN_DEBUG "RTAS: "
+ 
+#define RTAS_ERROR_LOG_MAX 2048
+
+/*
+ * Return the firmware-specified size of the error log buffer
+ *  for all rtas calls that require an error buffer argument.
+ *  This includes 'check-exception' and 'rtas-last-error'.
+ */
+extern int rtas_get_error_log_max(void);
+
+/* Event Scan Parameters */
+#define EVENT_SCAN_ALL_EVENTS	0xf0000000
+#define SURVEILLANCE_TOKEN	9000
+#define LOG_NUMBER		64		/* must be a power of two */
+#define LOG_NUMBER_MASK		(LOG_NUMBER-1)
+
+/* Some RTAS ops require a data buffer and that buffer must be < 4G.
+ * Rather than having a memory allocator, just use this buffer
+ * (get the lock first), make the RTAS call.  Copy the data instead
+ * of holding the buffer for long.
+ */
+
+#define RTAS_DATA_BUF_SIZE 4096
+extern spinlock_t rtas_data_buf_lock;
+extern char rtas_data_buf[RTAS_DATA_BUF_SIZE];
+
+extern void rtas_stop_self(void);
+
+/* RMO buffer reserved for user-space RTAS use */
+extern unsigned long rtas_rmo_buf;
+
+#define GLOBAL_INTERRUPT_QUEUE 9005
+
+#endif /* _POWERPC_RTAS_H */

include/asm-powerpc/system.h

@@ -346,7 +346,12 @@ __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new,
 
 #define arch_align_stack(x) (x)
 
+/* Used in very early kernel initialization. */
 extern unsigned long reloc_offset(void);
+extern unsigned long add_reloc_offset(unsigned long);
+extern void reloc_got2(unsigned long);
+
+#define PTRRELOC(x)	((typeof(x)) add_reloc_offset((unsigned long)(x)))
 
 #endif /* __KERNEL__ */
 #endif /* _ASM_POWERPC_SYSTEM_H */