sh: More tidying for large base pages.

There were a few more things that needed fixing up, namely THREAD_SIZE
and the TLB miss handler where certain PTRS_PER_PGD == PTRS_PER_PTE
assumptions were being made.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/Kconfig

@@ -596,6 +596,8 @@ menu "Boot options"
 config ZERO_PAGE_OFFSET
 	hex "Zero page offset"
 	default "0x00004000" if SH_MPC1211 || SH_SH03
+	default "0x00010000" if PAGE_SIZE_64KB
+	default "0x00002000" if PAGE_SIZE_8KB
 	default "0x00001000"
 	help
 	  This sets the default offset of zero page.

arch/sh/kernel/cpu/sh3/entry.S

@@ -332,12 +332,6 @@ general_exception:
 !
 !
 
-/* This code makes some assumptions to improve performance.
- * Make sure they are stil true. */
-#if PTRS_PER_PGD != PTRS_PER_PTE
-#error PGD and PTE sizes don't match
-#endif
-
 /* gas doesn't flag impossible values for mov #immediate as an error */
 #if (_PAGE_PRESENT >> 2) > 0x7f
 #error cannot load PAGE_PRESENT as an immediate
@@ -399,6 +393,7 @@ tlb_miss:
 
 	bt	20f			! 110 BR
 
+	mov.w	3f, k3			!  8 LS (latency=2)	(PTRS_PER_PTE-1) << 2
 	and	k3, k0			!  78 EX
 	mov.w	5f, k4			!   8 LS (latency=2)	_PAGE_PRESENT
 
@@ -491,8 +486,9 @@ tlb_miss:
 	.align 5
 	! Once cache line if possible...
 1:	.long	swapper_pg_dir
+3:	.short	(PTRS_PER_PTE-1) << 2
 4:	.short	(PTRS_PER_PGD-1) << 2
-5:	.short	_PAGE_PRESENT
+5:	.long	_PAGE_PRESENT
 7:	.long	_PAGE_FLAGS_HARDWARE_MASK
 8:	.long	MMU_PTEH
 #ifdef COUNT_EXCEPTIONS

include/asm-sh/pgtable.h

@@ -47,13 +47,13 @@ extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
 #define PGDIR_MASK	(~(PGDIR_SIZE-1))
 
 /* Entries per level */
-#define PTRS_PER_PTE	(PAGE_SIZE / 4)
+#define PTRS_PER_PTE	(PAGE_SIZE / (1 << PTE_MAGNITUDE))
 #define PTRS_PER_PGD	(PAGE_SIZE / 4)
 
 #define USER_PTRS_PER_PGD	(TASK_SIZE/PGDIR_SIZE)
 #define FIRST_USER_ADDRESS	0
 
-#define PTE_PHYS_MASK	0x1ffff000
+#define PTE_PHYS_MASK		(0x20000000 - PAGE_SIZE)
 
 /*
  * First 1MB map is used by fixed purpose.

include/asm-sh/thread_info.h

@@ -32,12 +32,20 @@ struct thread_info {
 
 #define PREEMPT_ACTIVE		0x10000000
 
-#ifdef CONFIG_4KSTACKS
-#define THREAD_SIZE		(PAGE_SIZE)
+#if defined(CONFIG_4KSTACKS)
+#define THREAD_SIZE_ORDER	(0)
+#elif defined(CONFIG_PAGE_SIZE_4KB)
+#define THREAD_SIZE_ORDER	(1)
+#elif defined(CONFIG_PAGE_SIZE_8KB)
+#define THREAD_SIZE_ORDER	(1)
+#elif defined(CONFIG_PAGE_SIZE_64KB)
+#define THREAD_SIZE_ORDER	(0)
 #else
-#define THREAD_SIZE		(PAGE_SIZE * 2)
+#error "Unknown thread size"
 #endif
-#define STACK_WARN		(THREAD_SIZE / 8)
+
+#define THREAD_SIZE	(PAGE_SIZE << THREAD_SIZE_ORDER)
+#define STACK_WARN	(THREAD_SIZE >> 3)
 
 /*
  * macros/functions for gaining access to the thread information structure