[SPARC64]: Move away from virtual page tables, part 1.

We now use the TSB hardware assist features of the UltraSPARC
MMUs.

SMP is currently knowingly broken, we need to find another place
to store the per-cpu base pointers.  We hid them away in the TSB
base register, and that obviously will not work any more :-)

Another known broken case is non-8KB base page size.

Also noticed that flush_tlb_all() is not referenced anywhere, only
the internal __flush_tlb_all() (local cpu only) is used by the
sparc64 port, so we can get rid of flush_tlb_all().

The kernel gets it's own 8KB TSB (swapper_tsb) and each address space
gets it's own private 8K TSB.  Later we can add code to dynamically
increase the size of per-process TSB as the RSS grows.  An 8KB TSB is
good enough for up to about a 4MB RSS, after which the TSB starts to
incur many capacity and conflict misses.

We even accumulate OBP translations into the kernel TSB.

Another area for refinement is large page size support.  We could use
a secondary address space TSB to handle those.

Signed-off-by: David S. Miller <davem@davemloft.net>

arch/sparc64/kernel/Makefile

@@ -38,5 +38,5 @@ else
   CMODEL_CFLAG := -m64 -mcmodel=medlow
 endif
 
-head.o: head.S ttable.S itlb_base.S dtlb_base.S dtlb_backend.S dtlb_prot.S \
+head.o: head.S ttable.S itlb_miss.S dtlb_miss.S ktlb.S tsb.S \
 	etrap.S rtrap.S winfixup.S entry.S

arch/sparc64/kernel/binfmt_aout32.c

@@ -31,6 +31,7 @@
 #include <asm/system.h>
 #include <asm/uaccess.h>
 #include <asm/pgalloc.h>
+#include <asm/mmu_context.h>
 
 static int load_aout32_binary(struct linux_binprm *, struct pt_regs * regs);
 static int load_aout32_library(struct file*);
@@ -329,15 +330,9 @@ beyond_if:
 
 	current->mm->start_stack =
 		(unsigned long) create_aout32_tables((char __user *)bprm->p, bprm);
-	if (!(orig_thr_flags & _TIF_32BIT)) {
-		unsigned long pgd_cache = get_pgd_cache(current->mm->pgd);
-
-		__asm__ __volatile__("stxa\t%0, [%1] %2\n\t"
-				     "membar #Sync"
-				     : /* no outputs */
-				     : "r" (pgd_cache),
-				       "r" (TSB_REG), "i" (ASI_DMMU));
-	}
+	tsb_context_switch(__pa(current->mm->pgd),
+	                   current->mm->context.sparc64_tsb);
+
 	start_thread32(regs, ex.a_entry, current->mm->start_stack);
 	if (current->ptrace & PT_PTRACED)
 		send_sig(SIGTRAP, current, 0);

arch/sparc64/kernel/dtlb_backend.S

@@ -1,170 +0,0 @@
-/* $Id: dtlb_backend.S,v 1.16 2001/10/09 04:02:11 davem Exp $
- * dtlb_backend.S: Back end to DTLB miss replacement strategy.
- *                 This is included directly into the trap table.
- *
- * Copyright (C) 1996,1998 David S. Miller (davem@redhat.com)
- * Copyright (C) 1997,1998 Jakub Jelinek   (jj@ultra.linux.cz)
- */
-
-#include <asm/pgtable.h>
-#include <asm/mmu.h>
-
-#define VALID_SZ_BITS	(_PAGE_VALID | _PAGE_SZBITS)
-
-#define VPTE_BITS		(_PAGE_CP | _PAGE_CV | _PAGE_P )
-#define VPTE_SHIFT		(PAGE_SHIFT - 3)
-
-/* Ways we can get here:
- *
- * 1) Nucleus loads and stores to/from PA-->VA direct mappings at tl>1.
- * 2) Nucleus loads and stores to/from user/kernel window save areas.
- * 3) VPTE misses from dtlb_base and itlb_base.
- *
- * We need to extract out the PMD and PGDIR indexes from the
- * linear virtual page table access address.  The PTE index
- * is at the bottom, but we are not concerned with it.  Bits
- * 0 to 2 are clear since each PTE is 8 bytes in size.  Each
- * PMD and PGDIR entry are 4 bytes in size.   Thus, this
- * address looks something like:
- *
- * |---------------------------------------------------------------|
- * |  ...   |    PGDIR index    |    PMD index    | PTE index  |   |
- * |---------------------------------------------------------------|
- *   63   F   E               D   C             B   A         3 2 0  <- bit nr
- *
- *  The variable bits above are defined as:
- *  A --> 3 + (PAGE_SHIFT - log2(8))
- *    --> 3 + (PAGE_SHIFT - 3) - 1
- *        (ie. this is "bit 3" + PAGE_SIZE - size of PTE entry in bits - 1)
- *  B --> A + 1
- *  C --> B + (PAGE_SHIFT - log2(4))
- *    -->  B + (PAGE_SHIFT - 2) - 1
- *        (ie. this is "bit B" + PAGE_SIZE - size of PMD entry in bits - 1)
- *  D --> C + 1
- *  E --> D + (PAGE_SHIFT - log2(4))
- *    --> D + (PAGE_SHIFT - 2) - 1
- *        (ie. this is "bit D" + PAGE_SIZE - size of PGDIR entry in bits - 1)
- *  F --> E + 1
- *
- * (Note how "B" always evalutes to PAGE_SHIFT, all the other constants
- *  cancel out.)
- *
- * For 8K PAGE_SIZE (thus, PAGE_SHIFT of 13) the bit numbers are:
- * A --> 12
- * B --> 13
- * C --> 23
- * D --> 24
- * E --> 34
- * F --> 35
- *
- * For 64K PAGE_SIZE (thus, PAGE_SHIFT of 16) the bit numbers are:
- * A --> 15
- * B --> 16
- * C --> 29
- * D --> 30
- * E --> 43
- * F --> 44
- *
- * Because bits both above and below each PGDIR and PMD index need to
- * be masked out, and the index can be as long as 14 bits (when using a
- * 64K PAGE_SIZE, and thus a PAGE_SHIFT of 16), we need 3 instructions
- * to extract each index out.
- *
- * Shifts do not pair very well on UltraSPARC-I, II, IIi, and IIe, so
- * we try to avoid using them for the entire operation.  We could setup
- * a mask anywhere from bit 31 down to bit 10 using the sethi instruction.
- *
- * We need a mask covering bits B --> C and one covering D --> E.
- * For 8K PAGE_SIZE these masks are 0x00ffe000 and 0x7ff000000.
- * For 64K PAGE_SIZE these masks are 0x3fff0000 and 0xfffc0000000.
- * The second in each set cannot be loaded with a single sethi
- * instruction, because the upper bits are past bit 32.  We would
- * need to use a sethi + a shift.
- *
- * For the time being, we use 2 shifts and a simple "and" mask.
- * We shift left to clear the bits above the index, we shift down
- * to clear the bits below the index (sans the log2(4 or 8) bits)
- * and a mask to clear the log2(4 or 8) bits.  We need therefore
- * define 4 shift counts, all of which are relative to PAGE_SHIFT.
- *
- * Although unsupportable for other reasons, this does mean that
- * 512K and 4MB page sizes would be generaally supported by the
- * kernel.  (ELF binaries would break with > 64K PAGE_SIZE since
- * the sections are only aligned that strongly).
- *
- * The operations performed for extraction are thus:
- *
- *      ((X << FOO_SHIFT_LEFT) >> FOO_SHIFT_RIGHT) & ~0x3
- *
- */
-
-#define A (3 + (PAGE_SHIFT - 3) - 1)
-#define B (A + 1)
-#define C (B + (PAGE_SHIFT - 2) - 1)
-#define D (C + 1)
-#define E (D + (PAGE_SHIFT - 2) - 1)
-#define F (E + 1)
-
-#define PMD_SHIFT_LEFT		(64 - D)
-#define PMD_SHIFT_RIGHT		(64 - (D - B) - 2)
-#define PGDIR_SHIFT_LEFT 	(64 - F)
-#define PGDIR_SHIFT_RIGHT	(64 - (F - D) - 2)
-#define LOW_MASK_BITS		0x3
-
-/* TLB1 ** ICACHE line 1: tl1 DTLB and quick VPTE miss	*/
-	ldxa		[%g1 + %g1] ASI_DMMU, %g4	! Get TAG_ACCESS
-	add		%g3, %g3, %g5			! Compute VPTE base
-	cmp		%g4, %g5			! VPTE miss?
-	bgeu,pt		%xcc, 1f			! Continue here
-	 andcc		%g4, TAG_CONTEXT_BITS, %g5	! tl0 miss Nucleus test
-	ba,a,pt		%xcc, from_tl1_trap		! Fall to tl0 miss
-1:	sllx		%g6, VPTE_SHIFT, %g4		! Position TAG_ACCESS
-	or		%g4, %g5, %g4			! Prepare TAG_ACCESS
-
-/* TLB1 ** ICACHE line 2: Quick VPTE miss	  	*/
-	mov		TSB_REG, %g1			! Grab TSB reg
-	ldxa		[%g1] ASI_DMMU, %g5		! Doing PGD caching?
-	sllx		%g6, PMD_SHIFT_LEFT, %g1	! Position PMD offset
-	be,pn		%xcc, sparc64_vpte_nucleus	! Is it from Nucleus?
-	 srlx		%g1, PMD_SHIFT_RIGHT, %g1	! Mask PMD offset bits
-	brnz,pt		%g5, sparc64_vpte_continue	! Yep, go like smoke
-	 andn		%g1, LOW_MASK_BITS, %g1		! Final PMD mask
-	sllx		%g6, PGDIR_SHIFT_LEFT, %g5	! Position PGD offset
-
-/* TLB1 ** ICACHE line 3: Quick VPTE miss	  	*/
-	srlx		%g5, PGDIR_SHIFT_RIGHT, %g5	! Mask PGD offset bits
-	andn		%g5, LOW_MASK_BITS, %g5		! Final PGD mask
-	lduwa		[%g7 + %g5] ASI_PHYS_USE_EC, %g5! Load PGD
-	brz,pn		%g5, vpte_noent			! Valid?
-sparc64_kpte_continue:
-	 sllx		%g5, 11, %g5			! Shift into place
-sparc64_vpte_continue:
-	lduwa		[%g5 + %g1] ASI_PHYS_USE_EC, %g5! Load PMD
-	sllx		%g5, 11, %g5			! Shift into place
-	brz,pn		%g5, vpte_noent			! Valid?
-
-/* TLB1 ** ICACHE line 4: Quick VPTE miss	  	*/
-	 mov		(VALID_SZ_BITS >> 61), %g1	! upper vpte into %g1
-	sllx		%g1, 61, %g1			! finish calc
-	or		%g5, VPTE_BITS, %g5		! Prepare VPTE data
-	or		%g5, %g1, %g5			! ...
-	mov		TLB_SFSR, %g1			! Restore %g1 value
-	stxa		%g5, [%g0] ASI_DTLB_DATA_IN	! Load VPTE into TLB
-	stxa		%g4, [%g1 + %g1] ASI_DMMU	! Restore previous TAG_ACCESS
-	retry						! Load PTE once again
-
-#undef VALID_SZ_BITS
-#undef VPTE_SHIFT
-#undef VPTE_BITS
-#undef A
-#undef B
-#undef C
-#undef D
-#undef E
-#undef F
-#undef PMD_SHIFT_LEFT
-#undef PMD_SHIFT_RIGHT
-#undef PGDIR_SHIFT_LEFT
-#undef PGDIR_SHIFT_RIGHT
-#undef LOW_MASK_BITS
-

arch/sparc64/kernel/dtlb_base.S

@@ -1,109 +0,0 @@
-/* $Id: dtlb_base.S,v 1.17 2001/10/11 22:33:52 davem Exp $
- * dtlb_base.S:	Front end to DTLB miss replacement strategy.
- *              This is included directly into the trap table.
- *
- * Copyright (C) 1996,1998 David S. Miller (davem@redhat.com)
- * Copyright (C) 1997,1998 Jakub Jelinek   (jj@ultra.linux.cz)
- */
-
-#include <asm/pgtable.h>
-#include <asm/mmu.h>
-
-/* %g1	TLB_SFSR	(%g1 + %g1 == TLB_TAG_ACCESS)
- * %g2	(KERN_HIGHBITS | KERN_LOWBITS)
- * %g3  VPTE base	(0xfffffffe00000000)	Spitfire/Blackbird (44-bit VA space)
- *			(0xffe0000000000000)	Cheetah		   (64-bit VA space)
- * %g7	__pa(current->mm->pgd)
- *
- * The VPTE base value is completely magic, but note that
- * few places in the kernel other than these TLB miss
- * handlers know anything about the VPTE mechanism or
- * how it works (see VPTE_SIZE, TASK_SIZE and PTRS_PER_PGD).
- * Consider the 44-bit VADDR Ultra-I/II case as an example:
- *
- * VA[0 :  (1<<43)] produce VPTE index [%g3                        :   0]
- * VA[0 : -(1<<43)] produce VPTE index [%g3-(1<<(43-PAGE_SHIFT+3)) : %g3]
- *
- * For Cheetah's 64-bit VADDR space this is:
- *
- * VA[0 :  (1<<63)] produce VPTE index [%g3                        :   0]
- * VA[0 : -(1<<63)] produce VPTE index [%g3-(1<<(63-PAGE_SHIFT+3)) : %g3]
- *
- * If you're paying attention you'll notice that this means half of
- * the VPTE table is above %g3 and half is below, low VA addresses
- * map progressively upwards from %g3, and high VA addresses map
- * progressively upwards towards %g3.  This trick was needed to make
- * the same 8 instruction handler work both for Spitfire/Blackbird's
- * peculiar VA space hole configuration and the full 64-bit VA space
- * one of Cheetah at the same time.
- */
-
-/* Ways we can get here:
- *
- * 1) Nucleus loads and stores to/from PA-->VA direct mappings.
- * 2) Nucleus loads and stores to/from vmalloc() areas.
- * 3) User loads and stores.
- * 4) User space accesses by nucleus at tl0
- */
-
-#if PAGE_SHIFT == 13
-/*
- * To compute vpte offset, we need to do ((addr >> 13) << 3),
- * which can be optimized to (addr >> 10) if bits 10/11/12 can
- * be guaranteed to be 0 ... mmu_context.h does guarantee this
- * by only using 10 bits in the hwcontext value.
- */
-#define CREATE_VPTE_OFFSET1(r1, r2) nop
-#define CREATE_VPTE_OFFSET2(r1, r2) \
-				srax	r1, 10, r2
-#else
-#define CREATE_VPTE_OFFSET1(r1, r2) \
-				srax	r1, PAGE_SHIFT, r2
-#define CREATE_VPTE_OFFSET2(r1, r2) \
-				sllx	r2, 3, r2
-#endif
-
-/* DTLB ** ICACHE line 1: Quick user TLB misses		*/
-	mov		TLB_SFSR, %g1
-	ldxa		[%g1 + %g1] ASI_DMMU, %g4	! Get TAG_ACCESS
-	andcc		%g4, TAG_CONTEXT_BITS, %g0	! From Nucleus?
-from_tl1_trap:
-	rdpr		%tl, %g5			! For TL==3 test
-	CREATE_VPTE_OFFSET1(%g4, %g6)			! Create VPTE offset
-	be,pn		%xcc, kvmap			! Yep, special processing
-	 CREATE_VPTE_OFFSET2(%g4, %g6)			! Create VPTE offset
-	cmp		%g5, 4				! Last trap level?
-
-/* DTLB ** ICACHE line 2: User finish + quick kernel TLB misses	*/
-	be,pn		%xcc, longpath			! Yep, cannot risk VPTE miss
-	 nop						! delay slot
-	ldxa		[%g3 + %g6] ASI_S, %g5		! Load VPTE
-1:	brgez,pn	%g5, longpath			! Invalid, branch out
-	 nop						! Delay-slot
-9:	stxa		%g5, [%g0] ASI_DTLB_DATA_IN	! Reload TLB
-	retry						! Trap return
-	nop
-
-/* DTLB ** ICACHE line 3: winfixups+real_faults		*/
-longpath:
-	rdpr		%pstate, %g5			! Move into alternate globals
-	wrpr		%g5, PSTATE_AG|PSTATE_MG, %pstate
-	rdpr		%tl, %g4			! See where we came from.
-	cmp		%g4, 1				! Is etrap/rtrap window fault?
-	mov		TLB_TAG_ACCESS, %g4		! Prepare for fault processing
-	ldxa		[%g4] ASI_DMMU, %g5		! Load faulting VA page
-	be,pt		%xcc, sparc64_realfault_common	! Jump to normal fault handling
-	 mov		FAULT_CODE_DTLB, %g4		! It was read from DTLB
-
-/* DTLB ** ICACHE line 4: Unused...	*/
-	ba,a,pt		%xcc, winfix_trampoline		! Call window fixup code
-	nop
-	nop
-	nop
-	nop
-	nop
-	nop
-	nop
-
-#undef CREATE_VPTE_OFFSET1
-#undef CREATE_VPTE_OFFSET2

arch/sparc64/kernel/dtlb_miss.S

@@ -0,0 +1,39 @@
+/* DTLB ** ICACHE line 1: Context 0 check and TSB load	*/
+	ldxa	[%g0] ASI_DMMU_TSB_8KB_PTR, %g1	! Get TSB 8K pointer
+	ldxa	[%g0] ASI_DMMU, %g6		! Get TAG TARGET
+	srlx	%g6, 48, %g5			! Get context
+	brz,pn	%g5, kvmap_dtlb			! Context 0 processing
+	 nop					! Delay slot (fill me)
+	ldda	[%g1] ASI_NUCLEUS_QUAD_LDD, %g4	! Load TSB entry
+	nop					! Push branch to next I$ line
+	cmp	%g4, %g6			! Compare TAG
+
+/* DTLB ** ICACHE line 2: TSB compare and TLB load	*/
+	bne,pn	%xcc, tsb_miss_dtlb		! Miss
+	 mov	FAULT_CODE_DTLB, %g3
+	stxa	%g5, [%g0] ASI_DTLB_DATA_IN	! Load TLB
+	retry					! Trap done
+	nop
+	nop
+	nop
+	nop
+
+/* DTLB ** ICACHE line 3:				*/
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+
+/* DTLB ** ICACHE line 4: 				*/
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop

arch/sparc64/kernel/etrap.S

@@ -99,6 +99,7 @@ etrap_irq:
 		wrpr	%g0, ETRAP_PSTATE2, %pstate
 		mov	%l6, %g6
 #ifdef CONFIG_SMP
+#error IMMU TSB usage must be fixed
 		mov	TSB_REG, %g3
 		ldxa	[%g3] ASI_IMMU, %g5
 #endif
@@ -248,6 +249,7 @@ scetrap:	rdpr	%pil, %g2
 		mov	%l6, %g6
 		stx	%i7, [%sp + PTREGS_OFF + PT_V9_I7]
 #ifdef CONFIG_SMP
+#error IMMU TSB usage must be fixed
 		mov	TSB_REG, %g3
 		ldxa	[%g3] ASI_IMMU, %g5
 #endif

arch/sparc64/kernel/head.S

@@ -429,17 +429,6 @@ setup_trap_table:
 	 *
 	 * %g6			--> current_thread_info()
 	 *
-	 * MMU Globals (PSTATE_MG):
-	 *
-	 * %g1			--> TLB_SFSR
-	 * %g2			--> ((_PAGE_VALID | _PAGE_SZ4MB |
-	 *			      _PAGE_CP | _PAGE_CV | _PAGE_P | _PAGE_W)
-	 *			     ^ 0xfffff80000000000)
-	 * (this %g2 value is used for computing the PAGE_OFFSET kernel
-	 *  TLB entries quickly, the virtual address of the fault XOR'd
-	 *  with this %g2 value is the PTE to load into the TLB)
-	 * %g3			--> VPTE_BASE_CHEETAH or VPTE_BASE_SPITFIRE
-	 *
 	 * Interrupt Globals (PSTATE_IG, setup by init_irqwork_curcpu()):
 	 *
 	 * %g6			--> __irq_work[smp_processor_id()]
@@ -450,40 +439,6 @@ setup_trap_table:
 	wrpr	%o1, PSTATE_AG, %pstate
 	mov	%o2, %g6
 
-#define KERN_HIGHBITS		((_PAGE_VALID|_PAGE_SZ4MB)^0xfffff80000000000)
-#define KERN_LOWBITS		(_PAGE_CP | _PAGE_CV | _PAGE_P | _PAGE_W)
-	wrpr	%o1, PSTATE_MG, %pstate
-	mov	TSB_REG, %g1
-	stxa	%g0, [%g1] ASI_DMMU
-	membar	#Sync
-	stxa	%g0, [%g1] ASI_IMMU
-	membar	#Sync
-	mov	TLB_SFSR, %g1
-	sethi	%uhi(KERN_HIGHBITS), %g2
-	or	%g2, %ulo(KERN_HIGHBITS), %g2
-	sllx	%g2, 32, %g2
-	or	%g2, KERN_LOWBITS, %g2
-
-	BRANCH_IF_ANY_CHEETAH(g3,g7,8f)
-	ba,pt	%xcc, 9f
-	 nop
-
-8:
-	sethi		%uhi(VPTE_BASE_CHEETAH), %g3
-	or		%g3, %ulo(VPTE_BASE_CHEETAH), %g3
-	ba,pt		%xcc, 2f
-	 sllx		%g3, 32, %g3
-
-9:
-	sethi		%uhi(VPTE_BASE_SPITFIRE), %g3
-	or		%g3, %ulo(VPTE_BASE_SPITFIRE), %g3
-	sllx		%g3, 32, %g3
-
-2:
-	clr	%g7
-#undef KERN_HIGHBITS
-#undef KERN_LOWBITS
-
 	/* Kill PROM timer */
 	sethi	%hi(0x80000000), %o2
 	sllx	%o2, 32, %o2
@@ -538,6 +493,7 @@ sparc64_boot_end:
 
 #include "systbls.S"
 #include "ktlb.S"
+#include "tsb.S"
 #include "etrap.S"
 #include "rtrap.S"
 #include "winfixup.S"

arch/sparc64/kernel/itlb_base.S

@@ -1,79 +0,0 @@
-/* $Id: itlb_base.S,v 1.12 2002/02/09 19:49:30 davem Exp $
- * itlb_base.S:	Front end to ITLB miss replacement strategy.
- *              This is included directly into the trap table.
- *
- * Copyright (C) 1996,1998 David S. Miller (davem@redhat.com)
- * Copyright (C) 1997,1998 Jakub Jelinek   (jj@ultra.linux.cz)
- */
-
-#if PAGE_SHIFT == 13
-/*
- * To compute vpte offset, we need to do ((addr >> 13) << 3),
- * which can be optimized to (addr >> 10) if bits 10/11/12 can
- * be guaranteed to be 0 ... mmu_context.h does guarantee this
- * by only using 10 bits in the hwcontext value.
- */
-#define CREATE_VPTE_OFFSET1(r1, r2) \
-				srax	r1, 10, r2
-#define CREATE_VPTE_OFFSET2(r1, r2) nop
-#else /* PAGE_SHIFT */
-#define CREATE_VPTE_OFFSET1(r1, r2) \
-				srax	r1, PAGE_SHIFT, r2
-#define CREATE_VPTE_OFFSET2(r1, r2) \
-				sllx	r2, 3, r2
-#endif /* PAGE_SHIFT */
-
-
-/* Ways we can get here:
- *
- * 1) Nucleus instruction misses from module code.
- * 2) All user instruction misses.
- *
- * All real page faults merge their code paths to the
- * sparc64_realfault_common label below.
- */
-
-/* ITLB ** ICACHE line 1: Quick user TLB misses		*/
-	mov		TLB_SFSR, %g1
-	ldxa		[%g1 + %g1] ASI_IMMU, %g4	! Get TAG_ACCESS
-	CREATE_VPTE_OFFSET1(%g4, %g6)			! Create VPTE offset
-	CREATE_VPTE_OFFSET2(%g4, %g6)			! Create VPTE offset
-	ldxa		[%g3 + %g6] ASI_P, %g5		! Load VPTE
-1:	brgez,pn	%g5, 3f				! Not valid, branch out
-	 sethi		%hi(_PAGE_EXEC), %g4		! Delay-slot
-	andcc		%g5, %g4, %g0			! Executable?
-
-/* ITLB ** ICACHE line 2: Real faults			*/
-	be,pn		%xcc, 3f			! Nope, branch.
-	 nop						! Delay-slot
-2:	stxa		%g5, [%g0] ASI_ITLB_DATA_IN	! Load PTE into TLB
-	retry						! Trap return
-3:	rdpr		%pstate, %g4			! Move into alt-globals
-	wrpr		%g4, PSTATE_AG|PSTATE_MG, %pstate
-	rdpr		%tpc, %g5			! And load faulting VA
-	mov		FAULT_CODE_ITLB, %g4		! It was read from ITLB
-
-/* ITLB ** ICACHE line 3: Finish faults	*/
-sparc64_realfault_common:				! Called by dtlb_miss
-	stb		%g4, [%g6 + TI_FAULT_CODE]
-	stx		%g5, [%g6 + TI_FAULT_ADDR]
-	ba,pt		%xcc, etrap			! Save state
-1:	 rd		%pc, %g7			! ...
-	call		do_sparc64_fault		! Call fault handler
-	 add		%sp, PTREGS_OFF, %o0! Compute pt_regs arg
-	ba,pt		%xcc, rtrap_clr_l6		! Restore cpu state
-	 nop
-
-/* ITLB ** ICACHE line 4: Window fixups */
-winfix_trampoline:
-	rdpr		%tpc, %g3			! Prepare winfixup TNPC
-	or		%g3, 0x7c, %g3			! Compute branch offset
-	wrpr		%g3, %tnpc			! Write it into TNPC
-	done						! Do it to it
-	nop
-	nop
-	nop
-	nop
-
-#undef CREATE_VPTE_OFFSET1
-#undef CREATE_VPTE_OFFSET2

arch/sparc64/kernel/itlb_miss.S

@@ -0,0 +1,39 @@
+/* ITLB ** ICACHE line 1: Context 0 check and TSB load	*/
+	ldxa	[%g0] ASI_IMMU_TSB_8KB_PTR, %g1	! Get TSB 8K pointer
+	ldxa	[%g0] ASI_IMMU, %g6		! Get TAG TARGET
+	srlx	%g6, 48, %g5			! Get context
+	brz,pn	%g5, kvmap_itlb			! Context 0 processing
+	 nop					! Delay slot (fill me)
+	ldda	[%g1] ASI_NUCLEUS_QUAD_LDD, %g4	! Load TSB entry
+	cmp	%g4, %g6			! Compare TAG
+	sethi	%hi(_PAGE_EXEC), %g4		! Setup exec check
+
+/* ITLB ** ICACHE line 2: TSB compare and TLB load	*/
+	bne,pn	%xcc, tsb_miss_itlb		! Miss
+	 mov	FAULT_CODE_ITLB, %g3
+	andcc	%g5, %g4, %g0			! Executable?
+	be,pn	%xcc, tsb_do_fault
+	 nop					! Delay slot, fill me
+	stxa	%g5, [%g0] ASI_ITLB_DATA_IN	! Load TLB
+	retry					! Trap done
+	nop
+
+/* ITLB ** ICACHE line 3: 				*/
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+
+/* ITLB ** ICACHE line 4: 				*/
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop

arch/sparc64/kernel/ktlb.S

@@ -4,191 +4,170 @@
  * Copyright (C) 1996 Eddie C. Dost        (ecd@brainaid.de)
  * Copyright (C) 1996 Miguel de Icaza      (miguel@nuclecu.unam.mx)
  * Copyright (C) 1996,98,99 Jakub Jelinek  (jj@sunsite.mff.cuni.cz)
-*/
+ */
 
 #include <linux/config.h>
 #include <asm/head.h>
 #include <asm/asi.h>
 #include <asm/page.h>
 #include <asm/pgtable.h>
+#include <asm/tsb.h>
 
 	.text
 	.align		32
 
-/*
- * On a second level vpte miss, check whether the original fault is to the OBP 
- * range (note that this is only possible for instruction miss, data misses to
- * obp range do not use vpte). If so, go back directly to the faulting address.
- * This is because we want to read the tpc, otherwise we have no way of knowing
- * the 8k aligned faulting address if we are using >8k kernel pagesize. This
- * also ensures no vpte range addresses are dropped into tlb while obp is
- * executing (see inherit_locked_prom_mappings() rant).
- */
-sparc64_vpte_nucleus:
-	/* Note that kvmap below has verified that the address is
-	 * in the range MODULES_VADDR --> VMALLOC_END already.  So
-	 * here we need only check if it is an OBP address or not.
-	 */
+	.globl		kvmap_itlb
+kvmap_itlb:
+	/* g6: TAG TARGET */
+	mov		TLB_TAG_ACCESS, %g4
+	ldxa		[%g4] ASI_IMMU, %g4
+
+kvmap_itlb_nonlinear:
+	/* Catch kernel NULL pointer calls.  */
+	sethi		%hi(PAGE_SIZE), %g5
+	cmp		%g4, %g5
+	bleu,pn		%xcc, kvmap_dtlb_longpath
+	 nop
+
+	KERN_TSB_LOOKUP_TL1(%g4, %g6, %g5, %g1, %g2, %g3, kvmap_itlb_load)
+
+kvmap_itlb_tsb_miss:
 	sethi		%hi(LOW_OBP_ADDRESS), %g5
 	cmp		%g4, %g5
-	blu,pn		%xcc, kern_vpte
+	blu,pn		%xcc, kvmap_itlb_vmalloc_addr
 	 mov		0x1, %g5
 	sllx		%g5, 32, %g5
 	cmp		%g4, %g5
-	blu,pn		%xcc, vpte_insn_obp
+	blu,pn		%xcc, kvmap_itlb_obp
 	 nop
 
-	/* These two instructions are patched by paginig_init().  */
-kern_vpte:
-	sethi		%hi(swapper_pgd_zero), %g5
-	lduw		[%g5 + %lo(swapper_pgd_zero)], %g5
-
-	/* With kernel PGD in %g5, branch back into dtlb_backend.  */
-	ba,pt		%xcc, sparc64_kpte_continue
-	 andn		%g1, 0x3, %g1	/* Finish PMD offset adjustment.  */
-
-vpte_noent:
-	/* Restore previous TAG_ACCESS, %g5 is zero, and we will
-	 * skip over the trap instruction so that the top level
-	 * TLB miss handler will thing this %g5 value is just an
-	 * invalid PTE, thus branching to full fault processing.
-	 */
-	mov		TLB_SFSR, %g1
-	stxa		%g4, [%g1 + %g1] ASI_DMMU
-	done
-
-vpte_insn_obp:
-	/* Behave as if we are at TL0.  */
-	wrpr		%g0, 1, %tl
-	rdpr		%tpc, %g4	/* Find original faulting iaddr */
-	srlx		%g4, 13, %g4	/* Throw out context bits */
-	sllx		%g4, 13, %g4	/* g4 has vpn + ctx0 now */
-
-	/* Restore previous TAG_ACCESS.  */
-	mov		TLB_SFSR, %g1
-	stxa		%g4, [%g1 + %g1] ASI_IMMU
-
-	sethi		%hi(prom_trans), %g5
-	or		%g5, %lo(prom_trans), %g5
-
-1:	ldx		[%g5 + 0x00], %g6	! base
-	brz,a,pn	%g6, longpath		! no more entries, fail
-	 mov		TLB_SFSR, %g1		! and restore %g1
-	ldx		[%g5 + 0x08], %g1	! len
-	add		%g6, %g1, %g1		! end
-	cmp		%g6, %g4
-	bgu,pt		%xcc, 2f
-	 cmp		%g4, %g1
-	bgeu,pt		%xcc, 2f
-	 ldx		[%g5 + 0x10], %g1	! PTE
-
-	/* TLB load, restore %g1, and return from trap.  */
-	sub		%g4, %g6, %g6
-	add		%g1, %g6, %g5
-	mov		TLB_SFSR, %g1
-	stxa		%g5, [%g0] ASI_ITLB_DATA_IN
-	retry
+kvmap_itlb_vmalloc_addr:
+	KERN_PGTABLE_WALK(%g4, %g5, %g2, kvmap_itlb_longpath)
+
+	TSB_LOCK_TAG(%g1, %g2, %g4)
+
+	/* Load and check PTE.  */
+	ldxa		[%g5] ASI_PHYS_USE_EC, %g5
+	brgez,a,pn	%g5, kvmap_itlb_longpath
+	 stx		%g0, [%g1]
 
-2:	ba,pt		%xcc, 1b
-	 add		%g5, (3 * 8), %g5	! next entry
-
-kvmap_do_obp:
-	sethi		%hi(prom_trans), %g5
-	or		%g5, %lo(prom_trans), %g5
-	srlx		%g4, 13, %g4
-	sllx		%g4, 13, %g4
-
-1:	ldx		[%g5 + 0x00], %g6	! base
-	brz,a,pn	%g6, longpath		! no more entries, fail
-	 mov		TLB_SFSR, %g1		! and restore %g1
-	ldx		[%g5 + 0x08], %g1	! len
-	add		%g6, %g1, %g1		! end
-	cmp		%g6, %g4
-	bgu,pt		%xcc, 2f
-	 cmp		%g4, %g1
-	bgeu,pt		%xcc, 2f
-	 ldx		[%g5 + 0x10], %g1	! PTE
-
-	/* TLB load, restore %g1, and return from trap.  */
-	sub		%g4, %g6, %g6
-	add		%g1, %g6, %g5
-	mov		TLB_SFSR, %g1
-	stxa		%g5, [%g0] ASI_DTLB_DATA_IN
+	TSB_WRITE(%g1, %g5, %g6)
+
+	/* fallthrough to TLB load */
+
+kvmap_itlb_load:
+	stxa		%g5, [%g0] ASI_ITLB_DATA_IN	! Reload TLB
 	retry
 
-2:	ba,pt		%xcc, 1b
-	 add		%g5, (3 * 8), %g5	! next entry
+kvmap_itlb_longpath:
+	rdpr	%pstate, %g5
+	wrpr	%g5, PSTATE_AG | PSTATE_MG, %pstate
+	rdpr	%tpc, %g5
+	ba,pt	%xcc, sparc64_realfault_common
+	 mov	FAULT_CODE_ITLB, %g4
+
+kvmap_itlb_obp:
+	OBP_TRANS_LOOKUP(%g4, %g5, %g2, %g3, kvmap_itlb_longpath)
+
+	TSB_LOCK_TAG(%g1, %g2, %g4)
+
+	TSB_WRITE(%g1, %g5, %g6)
+
+	ba,pt		%xcc, kvmap_itlb_load
+	 nop
+
+kvmap_dtlb_obp:
+	OBP_TRANS_LOOKUP(%g4, %g5, %g2, %g3, kvmap_dtlb_longpath)
+
+	TSB_LOCK_TAG(%g1, %g2, %g4)
+
+	TSB_WRITE(%g1, %g5, %g6)
+
+	ba,pt		%xcc, kvmap_dtlb_load
+	 nop
 
-/*
- * On a first level data miss, check whether this is to the OBP range (note
- * that such accesses can be made by prom, as well as by kernel using
- * prom_getproperty on "address"), and if so, do not use vpte access ...
- * rather, use information saved during inherit_prom_mappings() using 8k
- * pagesize.
- */
 	.align		32
-kvmap:
-	brgez,pn	%g4, kvmap_nonlinear
+	.globl		kvmap_dtlb
+kvmap_dtlb:
+	/* %g6: TAG TARGET */
+	mov		TLB_TAG_ACCESS, %g4
+	ldxa		[%g4] ASI_DMMU, %g4
+	brgez,pn	%g4, kvmap_dtlb_nonlinear
 	 nop
 
-#ifdef CONFIG_DEBUG_PAGEALLOC
+#define KERN_HIGHBITS	((_PAGE_VALID|_PAGE_SZ4MB)^0xfffff80000000000)
+#define KERN_LOWBITS	(_PAGE_CP | _PAGE_CV | _PAGE_P | _PAGE_W)
+
+	sethi		%uhi(KERN_HIGHBITS), %g2
+	or		%g2, %ulo(KERN_HIGHBITS), %g2
+	sllx		%g2, 32, %g2
+	or		%g2, KERN_LOWBITS, %g2
+
+#undef KERN_HIGHBITS
+#undef KERN_LOWBITS
+
 	.globl		kvmap_linear_patch
 kvmap_linear_patch:
-#endif
-	ba,pt		%xcc, kvmap_load
+	ba,pt		%xcc, kvmap_dtlb_load
 	 xor		%g2, %g4, %g5
 
-#ifdef CONFIG_DEBUG_PAGEALLOC
-	sethi		%hi(swapper_pg_dir), %g5
-	or		%g5, %lo(swapper_pg_dir), %g5
-	sllx		%g4, 64 - (PGDIR_SHIFT + PGDIR_BITS), %g6
-	srlx		%g6, 64 - PAGE_SHIFT, %g6
-	andn		%g6, 0x3, %g6
-	lduw		[%g5 + %g6], %g5
-	brz,pn		%g5, longpath
-	 sllx		%g4, 64 - (PMD_SHIFT + PMD_BITS), %g6
-	srlx		%g6, 64 - PAGE_SHIFT, %g6
-	sllx		%g5, 11, %g5
-	andn		%g6, 0x3, %g6
-	lduwa		[%g5 + %g6] ASI_PHYS_USE_EC, %g5
-	brz,pn		%g5, longpath
-	 sllx		%g4, 64 - PMD_SHIFT, %g6
-	srlx		%g6, 64 - PAGE_SHIFT, %g6
-	sllx		%g5, 11, %g5
-	andn		%g6, 0x7, %g6
-	ldxa		[%g5 + %g6] ASI_PHYS_USE_EC, %g5
-	brz,pn		%g5, longpath
+kvmap_dtlb_vmalloc_addr:
+	KERN_PGTABLE_WALK(%g4, %g5, %g2, kvmap_dtlb_longpath)
+
+	TSB_LOCK_TAG(%g1, %g2, %g4)
+
+	/* Load and check PTE.  */
+	ldxa		[%g5] ASI_PHYS_USE_EC, %g5
+	brgez,a,pn	%g5, kvmap_dtlb_longpath
+	 stx		%g0, [%g1]
+
+	TSB_WRITE(%g1, %g5, %g6)
+
+	/* fallthrough to TLB load */
+
+kvmap_dtlb_load:
+	stxa		%g5, [%g0] ASI_DTLB_DATA_IN	! Reload TLB
+	retry
+
+kvmap_dtlb_nonlinear:
+	/* Catch kernel NULL pointer derefs.  */
+	sethi		%hi(PAGE_SIZE), %g5
+	cmp		%g4, %g5
+	bleu,pn		%xcc, kvmap_dtlb_longpath
 	 nop
-	ba,a,pt		%xcc, kvmap_load
-#endif
 
-kvmap_nonlinear:
+	KERN_TSB_LOOKUP_TL1(%g4, %g6, %g5, %g1, %g2, %g3, kvmap_dtlb_load)
+
+kvmap_dtlb_tsbmiss:
 	sethi		%hi(MODULES_VADDR), %g5
 	cmp		%g4, %g5
-	blu,pn		%xcc, longpath
+	blu,pn		%xcc, kvmap_dtlb_longpath
 	 mov		(VMALLOC_END >> 24), %g5
 	sllx		%g5, 24, %g5
 	cmp		%g4, %g5
-	bgeu,pn		%xcc, longpath
+	bgeu,pn		%xcc, kvmap_dtlb_longpath
 	 nop
 
 kvmap_check_obp:
 	sethi		%hi(LOW_OBP_ADDRESS), %g5
 	cmp		%g4, %g5
-	blu,pn		%xcc, kvmap_vmalloc_addr
+	blu,pn		%xcc, kvmap_dtlb_vmalloc_addr
 	 mov		0x1, %g5
 	sllx		%g5, 32, %g5
 	cmp		%g4, %g5
-	blu,pn		%xcc, kvmap_do_obp
+	blu,pn		%xcc, kvmap_dtlb_obp
 	 nop
-
-kvmap_vmalloc_addr:
-	/* If we get here, a vmalloc addr was accessed, load kernel VPTE.  */
-	ldxa		[%g3 + %g6] ASI_N, %g5
-	brgez,pn	%g5, longpath
+	ba,pt		%xcc, kvmap_dtlb_vmalloc_addr
 	 nop
 
-kvmap_load:
-	/* PTE is valid, load into TLB and return from trap.  */
-	stxa		%g5, [%g0] ASI_DTLB_DATA_IN	! Reload TLB
-	retry
+kvmap_dtlb_longpath:
+	rdpr	%pstate, %g5
+	wrpr	%g5, PSTATE_AG | PSTATE_MG, %pstate
+	rdpr	%tl, %g4
+	cmp	%g4, 1
+	mov	TLB_TAG_ACCESS, %g4
+	ldxa	[%g4] ASI_DMMU, %g5
+	be,pt	%xcc, sparc64_realfault_common
+	 mov	FAULT_CODE_DTLB, %g4
+	ba,pt	%xcc, winfix_trampoline
+	 nop

arch/sparc64/kernel/process.c

@@ -44,6 +44,7 @@
 #include <asm/fpumacro.h>
 #include <asm/head.h>
 #include <asm/cpudata.h>
+#include <asm/mmu_context.h>
 #include <asm/unistd.h>
 
 /* #define VERBOSE_SHOWREGS */
@@ -433,30 +434,16 @@ void exit_thread(void)
 void flush_thread(void)
 {
 	struct thread_info *t = current_thread_info();
+	struct mm_struct *mm;
 
 	if (t->flags & _TIF_ABI_PENDING)
 		t->flags ^= (_TIF_ABI_PENDING | _TIF_32BIT);
 
-	if (t->task->mm) {
-		unsigned long pgd_cache = 0UL;
-		if (test_thread_flag(TIF_32BIT)) {
-			struct mm_struct *mm = t->task->mm;
-			pgd_t *pgd0 = &mm->pgd[0];
-			pud_t *pud0 = pud_offset(pgd0, 0);
+	mm = t->task->mm;
+	if (mm)
+		tsb_context_switch(__pa(mm->pgd),
+				   mm->context.sparc64_tsb);
 
-			if (pud_none(*pud0)) {
-				pmd_t *page = pmd_alloc_one(mm, 0);
-				pud_set(pud0, page);
-			}
-			pgd_cache = get_pgd_cache(pgd0);
-		}
-		__asm__ __volatile__("stxa %0, [%1] %2\n\t"
-				     "membar #Sync"
-				     : /* no outputs */
-				     : "r" (pgd_cache),
-				     "r" (TSB_REG),
-				     "i" (ASI_DMMU));
-	}
 	set_thread_wsaved(0);
 
 	/* Turn off performance counters if on. */

arch/sparc64/kernel/rtrap.S

@@ -223,10 +223,14 @@ rt_continue:	ldx			[%sp + PTREGS_OFF + PT_V9_G1], %g1
 		ldx			[%sp + PTREGS_OFF + PT_V9_G3], %g3
 		ldx			[%sp + PTREGS_OFF + PT_V9_G4], %g4
 		ldx			[%sp + PTREGS_OFF + PT_V9_G5], %g5
+#ifdef CONFIG_SMP
+#error IMMU TSB usage must be fixed
 		mov			TSB_REG, %g6
 		brnz,a,pn		%l3, 1f
 		 ldxa			[%g6] ASI_IMMU, %g5
-1:		ldx			[%sp + PTREGS_OFF + PT_V9_G6], %g6
+#endif
+1:
+		ldx			[%sp + PTREGS_OFF + PT_V9_G6], %g6
 		ldx			[%sp + PTREGS_OFF + PT_V9_G7], %g7
 		wrpr			%g0, RTRAP_PSTATE_AG_IRQOFF, %pstate
 		ldx			[%sp + PTREGS_OFF + PT_V9_I0], %i0

arch/sparc64/kernel/smp.c

@@ -123,6 +123,7 @@ extern void inherit_locked_prom_mappings(int save_p);
 
 static inline void cpu_setup_percpu_base(unsigned long cpu_id)
 {
+#error IMMU TSB usage must be fixed
 	__asm__ __volatile__("mov	%0, %%g5\n\t"
 			     "stxa	%0, [%1] %2\n\t"
 			     "membar	#Sync"
@@ -662,8 +663,6 @@ void smp_call_function_client(int irq, struct pt_regs *regs)
 extern unsigned long xcall_flush_tlb_mm;
 extern unsigned long xcall_flush_tlb_pending;
 extern unsigned long xcall_flush_tlb_kernel_range;
-extern unsigned long xcall_flush_tlb_all_spitfire;
-extern unsigned long xcall_flush_tlb_all_cheetah;
 extern unsigned long xcall_report_regs;
 extern unsigned long xcall_receive_signal;
 
@@ -794,15 +793,6 @@ void smp_report_regs(void)
 	smp_cross_call(&xcall_report_regs, 0, 0, 0);
 }
 
-void smp_flush_tlb_all(void)
-{
-	if (tlb_type == spitfire)
-		smp_cross_call(&xcall_flush_tlb_all_spitfire, 0, 0, 0);
-	else
-		smp_cross_call(&xcall_flush_tlb_all_cheetah, 0, 0, 0);
-	__flush_tlb_all();
-}
-
 /* We know that the window frames of the user have been flushed
  * to the stack before we get here because all callers of us
  * are flush_tlb_*() routines, and these run after flush_cache_*()

arch/sparc64/kernel/trampoline.S

@@ -295,39 +295,6 @@ do_unlock:
 	wrpr		%g5, %tba
 	mov		%o2, %g6
 
-	wrpr		%o1, PSTATE_MG, %pstate
-#define KERN_HIGHBITS		((_PAGE_VALID|_PAGE_SZ4MB)^0xfffff80000000000)
-#define KERN_LOWBITS		(_PAGE_CP | _PAGE_CV | _PAGE_P | _PAGE_W)
-
-	mov		TSB_REG, %g1
-	stxa		%g0, [%g1] ASI_DMMU
-	membar		#Sync
-	mov		TLB_SFSR, %g1
-	sethi		%uhi(KERN_HIGHBITS), %g2
-	or		%g2, %ulo(KERN_HIGHBITS), %g2
-	sllx		%g2, 32, %g2
-	or		%g2, KERN_LOWBITS, %g2
-
-	BRANCH_IF_ANY_CHEETAH(g3,g7,9f)
-
-	ba,pt		%xcc, 1f
-	 nop
-
-9:
-	sethi		%uhi(VPTE_BASE_CHEETAH), %g3
-	or		%g3, %ulo(VPTE_BASE_CHEETAH), %g3
-	ba,pt		%xcc, 2f
-	 sllx		%g3, 32, %g3
-1:
-	sethi		%uhi(VPTE_BASE_SPITFIRE), %g3
-	or		%g3, %ulo(VPTE_BASE_SPITFIRE), %g3
-	sllx		%g3, 32, %g3
-
-2:
-	clr	%g7
-#undef KERN_HIGHBITS
-#undef KERN_LOWBITS
-
 	wrpr		%o1, 0x0, %pstate
 	ldx		[%g6 + TI_TASK], %g4
 

arch/sparc64/kernel/tsb.S

@@ -0,0 +1,169 @@
+/* tsb.S: Sparc64 TSB table handling.
+ *
+ * Copyright (C) 2006 David S. Miller <davem@davemloft.net>
+ */
+
+#include <asm/tsb.h>
+
+	.text
+	.align	32
+
+	/* Invoked from TLB miss handler, we are in the
+	 * MMU global registers and they are setup like
+	 * this:
+	 *
+	 * %g1: TSB entry pointer
+	 * %g2:	available temporary
+	 * %g3:	FAULT_CODE_{D,I}TLB
+	 * %g4:	available temporary
+	 * %g5:	available temporary
+	 * %g6: TAG TARGET
+	 * %g7:	physical address base of the linux page
+	 *      tables for the current address space
+	 */
+	.globl		tsb_miss_dtlb
+tsb_miss_dtlb:
+	mov		TLB_TAG_ACCESS, %g4
+	ldxa		[%g4] ASI_DMMU, %g4
+	ba,pt		%xcc, tsb_miss_page_table_walk
+	 nop
+
+	.globl		tsb_miss_itlb
+tsb_miss_itlb:
+	mov		TLB_TAG_ACCESS, %g4
+	ldxa		[%g4] ASI_IMMU, %g4
+	ba,pt		%xcc, tsb_miss_page_table_walk
+	 nop
+
+tsb_miss_page_table_walk:
+	USER_PGTABLE_WALK_TL1(%g4, %g7, %g5, %g2, tsb_do_fault)
+
+tsb_reload:
+	TSB_LOCK_TAG(%g1, %g2, %g4)
+
+	/* Load and check PTE.  */
+	ldxa		[%g5] ASI_PHYS_USE_EC, %g5
+	brgez,a,pn	%g5, tsb_do_fault
+	 stx		%g0, [%g1]
+
+	TSB_WRITE(%g1, %g5, %g6)
+
+	/* Finally, load TLB and return from trap.  */
+tsb_tlb_reload:
+	cmp		%g3, FAULT_CODE_DTLB
+	bne,pn		%xcc, tsb_itlb_load
+	 nop
+
+tsb_dtlb_load:
+	stxa		%g5, [%g0] ASI_DTLB_DATA_IN
+	retry
+
+tsb_itlb_load:
+	stxa		%g5, [%g0] ASI_ITLB_DATA_IN
+	retry
+
+	/* No valid entry in the page tables, do full fault
+	 * processing.
+	 */
+
+	.globl		tsb_do_fault
+tsb_do_fault:
+	cmp		%g3, FAULT_CODE_DTLB
+	rdpr		%pstate, %g5
+	bne,pn		%xcc, tsb_do_itlb_fault
+	 wrpr		%g5, PSTATE_AG | PSTATE_MG, %pstate
+
+tsb_do_dtlb_fault:
+	rdpr	%tl, %g4
+	cmp	%g4, 1
+	mov	TLB_TAG_ACCESS, %g4
+	ldxa	[%g4] ASI_DMMU, %g5
+	be,pt	%xcc, sparc64_realfault_common
+	 mov	FAULT_CODE_DTLB, %g4
+	ba,pt	%xcc, winfix_trampoline
+	 nop
+
+tsb_do_itlb_fault:
+	rdpr	%tpc, %g5
+	ba,pt	%xcc, sparc64_realfault_common
+	 mov	FAULT_CODE_ITLB, %g4
+
+	.globl	sparc64_realfault_common
+sparc64_realfault_common:
+	stb	%g4, [%g6 + TI_FAULT_CODE]	! Save fault code
+	stx	%g5, [%g6 + TI_FAULT_ADDR]	! Save fault address
+	ba,pt	%xcc, etrap			! Save trap state
+1:	 rd	%pc, %g7			! ...
+	call	do_sparc64_fault		! Call fault handler
+	 add	%sp, PTREGS_OFF, %o0		! Compute pt_regs arg
+	ba,pt	%xcc, rtrap_clr_l6		! Restore cpu state
+	 nop					! Delay slot (fill me)
+
+	.globl	winfix_trampoline
+winfix_trampoline:
+	rdpr	%tpc, %g3			! Prepare winfixup TNPC
+	or	%g3, 0x7c, %g3			! Compute branch offset
+	wrpr	%g3, %tnpc			! Write it into TNPC
+	done					! Trap return
+
+	/* Reload MMU related context switch state at
+	 * schedule() time.
+	 *
+	 * %o0: page table physical address
+	 * %o1:	TSB address
+	 */
+	.globl	tsb_context_switch
+tsb_context_switch:
+	wrpr	%g0, PSTATE_MG | PSTATE_RMO | PSTATE_PEF | PSTATE_PRIV, %pstate
+
+	/* Set page table base alternate global.  */
+	mov	%o0, %g7
+
+	/* XXX can this happen?  */
+	brz,pn	%o1, 9f
+	 nop
+
+	/* Lock TSB into D-TLB.  */
+	sethi		%hi(PAGE_SIZE), %o3
+	and		%o3, %o1, %o3
+	sethi		%hi(TSBMAP_BASE), %o2
+	add		%o2, %o3, %o2
+
+	/* XXX handle PAGE_SIZE != 8K correctly...  */
+	mov	TSB_REG, %g1
+	stxa	%o2, [%g1] ASI_DMMU
+	membar	#Sync
+
+	stxa	%o2, [%g1] ASI_IMMU
+	membar	#Sync
+
+#define KERN_HIGHBITS	((_PAGE_VALID|_PAGE_SZBITS)^0xfffff80000000000)
+#define KERN_LOWBITS	(_PAGE_CP | _PAGE_CV | _PAGE_P | _PAGE_W | _PAGE_L)
+	sethi		%uhi(KERN_HIGHBITS), %g2
+	or		%g2, %ulo(KERN_HIGHBITS), %g2
+	sllx		%g2, 32, %g2
+	or		%g2, KERN_LOWBITS, %g2
+#undef KERN_HIGHBITS
+#undef KERN_LOWBITS
+
+	xor		%o1, %g2, %o1	
+
+	/* We use entry 61 for this locked entry.  This is the spitfire
+	 * TLB entry number, and luckily cheetah masks the value with
+	 * 15 ending us up with entry 13 which is what we want in that
+	 * case too.
+	 *
+	 * XXX Interactions with prom_world()...
+	 */
+	mov		TLB_TAG_ACCESS, %g1
+	stxa		%o2, [%g1] ASI_DMMU
+	membar		#Sync
+	mov		(61 << 3), %g1
+	stxa		%o1, [%g1] ASI_DTLB_DATA_ACCESS
+	membar		#Sync
+
+9:
+	wrpr	%g0, PSTATE_RMO | PSTATE_PEF | PSTATE_PRIV | PSTATE_IE, %pstate
+
+	retl
+	 mov	%o2, %o0

arch/sparc64/kernel/ttable.S

@@ -78,9 +78,9 @@ tl0_vaw:	TRAP(do_vaw)
 tl0_cee:	membar #Sync
 		TRAP_NOSAVE_7INSNS(__spitfire_cee_trap)
 tl0_iamiss:
-#include	"itlb_base.S"
+#include	"itlb_miss.S"
 tl0_damiss:
-#include	"dtlb_base.S"
+#include	"dtlb_miss.S"
 tl0_daprot:
 #include	"dtlb_prot.S"
 tl0_fecc:	BTRAP(0x70)	/* Fast-ECC on Cheetah */
@@ -241,7 +241,7 @@ tl1_cee:	membar	#Sync
 
 tl1_iamiss:	BTRAPTL1(0x64) BTRAPTL1(0x65) BTRAPTL1(0x66) BTRAPTL1(0x67)
 tl1_damiss:
-#include	"dtlb_backend.S"
+#include	"dtlb_miss.S"
 tl1_daprot:
 #include	"dtlb_prot.S"
 tl1_fecc:	BTRAPTL1(0x70)	/* Fast-ECC on Cheetah */

arch/sparc64/kernel/vmlinux.lds.S

@@ -43,6 +43,9 @@ SECTIONS
   __ex_table : { *(__ex_table) }
   __stop___ex_table = .;
 
+  . = ALIGN(8192);
+  swapper_tsb = .;
+  . += 8192;
   . = ALIGN(8192);
   __init_begin = .;
   .init.text : { 

arch/sparc64/kernel/winfixup.S

@@ -85,6 +85,7 @@ fill_fixup:
 	mov		%o7, %g6
 	ldx		[%g6 + TI_TASK], %g4
 #ifdef CONFIG_SMP
+#error IMMU TSB usage must be fixed
 	mov		TSB_REG, %g1
 	ldxa		[%g1] ASI_IMMU, %g5
 #endif
@@ -209,6 +210,7 @@ fill_fixup_mna:
 	mov		%o7, %g6			! Get current back.
 	ldx		[%g6 + TI_TASK], %g4		! Finish it.
 #ifdef CONFIG_SMP
+#error IMMU TSB usage must be fixed
 	mov		TSB_REG, %g1
 	ldxa		[%g1] ASI_IMMU, %g5
 #endif
@@ -278,11 +280,6 @@ window_mna_from_user_common:
 	ba,pt		%xcc, rtrap
 	 clr		%l6
 	
-	/* These are only needed for 64-bit mode processes which
-	 * put their stack pointer into the VPTE area and there
-	 * happens to be a VPTE tlb entry mapped there during
-	 * a spill/fill trap to that stack frame.
-	 */
 	.globl		winfix_dax, fill_fixup_dax, spill_fixup_dax
 winfix_dax:
 	andn		%g3, 0x7f, %g3
@@ -318,6 +315,7 @@ fill_fixup_dax:
 	mov		%o7, %g6			! Get current back.
 	ldx		[%g6 + TI_TASK], %g4		! Finish it.
 #ifdef CONFIG_SMP
+#error IMMU TSB usage must be fixed
 	mov		TSB_REG, %g1
 	ldxa		[%g1] ASI_IMMU, %g5
 #endif

arch/sparc64/mm/Makefile

@@ -5,6 +5,6 @@
 EXTRA_AFLAGS := -ansi
 EXTRA_CFLAGS := -Werror
 
-obj-y    := ultra.o tlb.o fault.o init.o generic.o
+obj-y    := ultra.o tlb.o tsb.o fault.o init.o generic.o
 
 obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o

arch/sparc64/mm/init.c

@@ -408,8 +408,7 @@ unsigned long prom_virt_to_phys(unsigned long promva, int *error)
 
 /* The obp translations are saved based on 8k pagesize, since obp can
  * use a mixture of pagesizes. Misses to the LOW_OBP_ADDRESS ->
- * HI_OBP_ADDRESS range are handled in ktlb.S and do not use the vpte
- * scheme (also, see rant in inherit_locked_prom_mappings()).
+ * HI_OBP_ADDRESS range are handled in ktlb.S.
  */
 static inline int in_obp_range(unsigned long vaddr)
 {
@@ -539,75 +538,6 @@ static void __init inherit_prom_mappings(void)
 	prom_printf("done.\n");
 }
 
-/* The OBP specifications for sun4u mark 0xfffffffc00000000 and
- * upwards as reserved for use by the firmware (I wonder if this
- * will be the same on Cheetah...).  We use this virtual address
- * range for the VPTE table mappings of the nucleus so we need
- * to zap them when we enter the PROM.  -DaveM
- */
-static void __flush_nucleus_vptes(void)
-{
-	unsigned long prom_reserved_base = 0xfffffffc00000000UL;
-	int i;
-
-	/* Only DTLB must be checked for VPTE entries. */
-	if (tlb_type == spitfire) {
-		for (i = 0; i < 63; i++) {
-			unsigned long tag;
-
-			/* Spitfire Errata #32 workaround */
-			/* NOTE: Always runs on spitfire, so no cheetah+
-			 *       page size encodings.
-			 */
-			__asm__ __volatile__("stxa	%0, [%1] %2\n\t"
-					     "flush	%%g6"
-					     : /* No outputs */
-					     : "r" (0),
-					     "r" (PRIMARY_CONTEXT), "i" (ASI_DMMU));
-
-			tag = spitfire_get_dtlb_tag(i);
-			if (((tag & ~(PAGE_MASK)) == 0) &&
-			    ((tag &  (PAGE_MASK)) >= prom_reserved_base)) {
-				__asm__ __volatile__("stxa %%g0, [%0] %1\n\t"
-						     "membar #Sync"
-						     : /* no outputs */
-						     : "r" (TLB_TAG_ACCESS), "i" (ASI_DMMU));
-				spitfire_put_dtlb_data(i, 0x0UL);
-			}
-		}
-	} else if (tlb_type == cheetah || tlb_type == cheetah_plus) {
-		for (i = 0; i < 512; i++) {
-			unsigned long tag = cheetah_get_dtlb_tag(i, 2);
-
-			if ((tag & ~PAGE_MASK) == 0 &&
-			    (tag & PAGE_MASK) >= prom_reserved_base) {
-				__asm__ __volatile__("stxa %%g0, [%0] %1\n\t"
-						     "membar #Sync"
-						     : /* no outputs */
-						     : "r" (TLB_TAG_ACCESS), "i" (ASI_DMMU));
-				cheetah_put_dtlb_data(i, 0x0UL, 2);
-			}
-
-			if (tlb_type != cheetah_plus)
-				continue;
-
-			tag = cheetah_get_dtlb_tag(i, 3);
-
-			if ((tag & ~PAGE_MASK) == 0 &&
-			    (tag & PAGE_MASK) >= prom_reserved_base) {
-				__asm__ __volatile__("stxa %%g0, [%0] %1\n\t"
-						     "membar #Sync"
-						     : /* no outputs */
-						     : "r" (TLB_TAG_ACCESS), "i" (ASI_DMMU));
-				cheetah_put_dtlb_data(i, 0x0UL, 3);
-			}
-		}
-	} else {
-		/* Implement me :-) */
-		BUG();
-	}
-}
-
 static int prom_ditlb_set;
 struct prom_tlb_entry {
 	int		tlb_ent;
@@ -635,9 +565,6 @@ void prom_world(int enter)
 			     : "i" (PSTATE_IE));
 
 	if (enter) {
-		/* Kick out nucleus VPTEs. */
-		__flush_nucleus_vptes();
-
 		/* Install PROM world. */
 		for (i = 0; i < 16; i++) {
 			if (prom_dtlb[i].tlb_ent != -1) {
@@ -1039,18 +966,7 @@ out:
 struct pgtable_cache_struct pgt_quicklists;
 #endif
 
-/* OK, we have to color these pages. The page tables are accessed
- * by non-Dcache enabled mapping in the VPTE area by the dtlb_backend.S
- * code, as well as by PAGE_OFFSET range direct-mapped addresses by 
- * other parts of the kernel. By coloring, we make sure that the tlbmiss 
- * fast handlers do not get data from old/garbage dcache lines that 
- * correspond to an old/stale virtual address (user/kernel) that 
- * previously mapped the pagetable page while accessing vpte range 
- * addresses. The idea is that if the vpte color and PAGE_OFFSET range 
- * color is the same, then when the kernel initializes the pagetable 
- * using the later address range, accesses with the first address
- * range will see the newly initialized data rather than the garbage.
- */
+/* XXX We don't need to color these things in the D-cache any longer.  */
 #ifdef DCACHE_ALIASING_POSSIBLE
 #define DC_ALIAS_SHIFT	1
 #else
@@ -1419,6 +1335,9 @@ void kernel_map_pages(struct page *page, int numpages, int enable)
 	kernel_map_range(phys_start, phys_end,
 			 (enable ? PAGE_KERNEL : __pgprot(0)));
 
+	flush_tsb_kernel_range(PAGE_OFFSET + phys_start,
+			       PAGE_OFFSET + phys_end);
+
 	/* we should perform an IPI and flush all tlbs,
 	 * but that can deadlock->flush only current cpu.
 	 */

arch/sparc64/mm/tlb.c

@@ -25,6 +25,8 @@ void flush_tlb_pending(void)
 	struct mmu_gather *mp = &__get_cpu_var(mmu_gathers);
 
 	if (mp->tlb_nr) {
+		flush_tsb_user(mp);
+
 		if (CTX_VALID(mp->mm->context)) {
 #ifdef CONFIG_SMP
 			smp_flush_tlb_pending(mp->mm, mp->tlb_nr,
@@ -89,62 +91,3 @@ no_cache_flush:
 	if (nr >= TLB_BATCH_NR)
 		flush_tlb_pending();
 }
-
-void flush_tlb_pgtables(struct mm_struct *mm, unsigned long start, unsigned long end)
-{
-	struct mmu_gather *mp = &__get_cpu_var(mmu_gathers);
-	unsigned long nr = mp->tlb_nr;
-	long s = start, e = end, vpte_base;
-
-	if (mp->fullmm)
-		return;
-
-	/* If start is greater than end, that is a real problem.  */
-	BUG_ON(start > end);
-
-	/* However, straddling the VA space hole is quite normal. */
-	s &= PMD_MASK;
-	e = (e + PMD_SIZE - 1) & PMD_MASK;
-
-	vpte_base = (tlb_type == spitfire ?
-		     VPTE_BASE_SPITFIRE :
-		     VPTE_BASE_CHEETAH);
-
-	if (unlikely(nr != 0 && mm != mp->mm)) {
-		flush_tlb_pending();
-		nr = 0;
-	}
-
-	if (nr == 0)
-		mp->mm = mm;
-
-	start = vpte_base + (s >> (PAGE_SHIFT - 3));
-	end = vpte_base + (e >> (PAGE_SHIFT - 3));
-
-	/* If the request straddles the VA space hole, we
-	 * need to swap start and end.  The reason this
-	 * occurs is that "vpte_base" is the center of
-	 * the linear page table mapping area.  Thus,
-	 * high addresses with the sign bit set map to
-	 * addresses below vpte_base and non-sign bit
-	 * addresses map to addresses above vpte_base.
-	 */
-	if (end < start) {
-		unsigned long tmp = start;
-
-		start = end;
-		end = tmp;
-	}
-
-	while (start < end) {
-		mp->vaddrs[nr] = start;
-		mp->tlb_nr = ++nr;
-		if (nr >= TLB_BATCH_NR) {
-			flush_tlb_pending();
-			nr = 0;
-		}
-		start += PAGE_SIZE;
-	}
-	if (nr)
-		flush_tlb_pending();
-}

arch/sparc64/mm/tsb.c

@@ -0,0 +1,84 @@
+/* arch/sparc64/mm/tsb.c
+ *
+ * Copyright (C) 2006 David S. Miller <davem@davemloft.net>
+ */
+
+#include <linux/kernel.h>
+#include <asm/system.h>
+#include <asm/page.h>
+#include <asm/tlbflush.h>
+#include <asm/tlb.h>
+
+#define TSB_ENTRY_ALIGNMENT	16
+
+struct tsb {
+	unsigned long tag;
+	unsigned long pte;
+} __attribute__((aligned(TSB_ENTRY_ALIGNMENT)));
+
+/* We use an 8K TSB for the whole kernel, this allows to
+ * handle about 4MB of modules and vmalloc mappings without
+ * incurring many hash conflicts.
+ */
+#define KERNEL_TSB_SIZE_BYTES	8192
+#define KERNEL_TSB_NENTRIES \
+	(KERNEL_TSB_SIZE_BYTES / sizeof(struct tsb))
+
+extern struct tsb swapper_tsb[KERNEL_TSB_NENTRIES];
+
+static inline unsigned long tsb_hash(unsigned long vaddr)
+{
+	vaddr >>= PAGE_SHIFT;
+	return vaddr & (KERNEL_TSB_NENTRIES - 1);
+}
+
+static inline int tag_compare(struct tsb *entry, unsigned long vaddr, unsigned long context)
+{
+	if (context == ~0UL)
+		return 1;
+
+	return (entry->tag == ((vaddr >> 22) | (context << 48)));
+}
+
+/* TSB flushes need only occur on the processor initiating the address
+ * space modification, not on each cpu the address space has run on.
+ * Only the TLB flush needs that treatment.
+ */
+
+void flush_tsb_kernel_range(unsigned long start, unsigned long end)
+{
+	unsigned long v;
+
+	for (v = start; v < end; v += PAGE_SIZE) {
+		struct tsb *ent = &swapper_tsb[tsb_hash(v)];
+
+		if (tag_compare(ent, v, 0)) {
+			ent->tag = 0UL;
+			membar_storeload_storestore();
+		}
+	}
+}
+
+void flush_tsb_user(struct mmu_gather *mp)
+{
+	struct mm_struct *mm = mp->mm;
+	struct tsb *tsb = (struct tsb *) mm->context.sparc64_tsb;
+	unsigned long ctx = ~0UL;
+	int i;
+
+	if (CTX_VALID(mm->context))
+		ctx = CTX_HWBITS(mm->context);
+
+	for (i = 0; i < mp->tlb_nr; i++) {
+		unsigned long v = mp->vaddrs[i];
+		struct tsb *ent;
+
+		v &= ~0x1UL;
+
+		ent = &tsb[tsb_hash(v)];
+		if (tag_compare(ent, v, ctx)) {
+			ent->tag = 0UL;
+			membar_storeload_storestore();
+		}
+	}
+}

arch/sparc64/mm/ultra.S

@@ -453,64 +453,6 @@ xcall_flush_dcache_page_spitfire: /* %g1 == physical page address
 	nop
 	nop
 
-	.data
-
-errata32_hwbug:
-	.xword	0
-
-	.text
-
-	/* These two are not performance critical... */
-	.globl		xcall_flush_tlb_all_spitfire
-xcall_flush_tlb_all_spitfire:
-	/* Spitfire Errata #32 workaround. */
-	sethi		%hi(errata32_hwbug), %g4
-	stx		%g0, [%g4 + %lo(errata32_hwbug)]
-
-	clr		%g2
-	clr		%g3
-1:	ldxa		[%g3] ASI_DTLB_DATA_ACCESS, %g4
-	and		%g4, _PAGE_L, %g5
-	brnz,pn		%g5, 2f
-	 mov		TLB_TAG_ACCESS, %g7
-
-	stxa		%g0, [%g7] ASI_DMMU
-	membar		#Sync
-	stxa		%g0, [%g3] ASI_DTLB_DATA_ACCESS
-	membar		#Sync
-
-	/* Spitfire Errata #32 workaround. */
-	sethi		%hi(errata32_hwbug), %g4
-	stx		%g0, [%g4 + %lo(errata32_hwbug)]
-
-2:	ldxa		[%g3] ASI_ITLB_DATA_ACCESS, %g4
-	and		%g4, _PAGE_L, %g5
-	brnz,pn		%g5, 2f
-	 mov		TLB_TAG_ACCESS, %g7
-
-	stxa		%g0, [%g7] ASI_IMMU
-	membar		#Sync
-	stxa		%g0, [%g3] ASI_ITLB_DATA_ACCESS
-	membar		#Sync
-
-	/* Spitfire Errata #32 workaround. */
-	sethi		%hi(errata32_hwbug), %g4
-	stx		%g0, [%g4 + %lo(errata32_hwbug)]
-
-2:	add		%g2, 1, %g2
-	cmp		%g2, SPITFIRE_HIGHEST_LOCKED_TLBENT
-	ble,pt		%icc, 1b
-	 sll		%g2, 3, %g3
-	flush		%g6
-	retry
-
-	.globl		xcall_flush_tlb_all_cheetah
-xcall_flush_tlb_all_cheetah:
-	mov		0x80, %g2
-	stxa		%g0, [%g2] ASI_DMMU_DEMAP
-	stxa		%g0, [%g2] ASI_IMMU_DEMAP
-	retry
-
 	/* These just get rescheduled to PIL vectors. */
 	.globl		xcall_call_function
 xcall_call_function:

include/asm-sparc64/mmu.h

@@ -92,6 +92,7 @@
 
 typedef struct {
 	unsigned long	sparc64_ctx_val;
+	unsigned long	*sparc64_tsb;
 } mm_context_t;
 
 #endif /* !__ASSEMBLY__ */

include/asm-sparc64/mmu_context.h

@@ -25,7 +25,13 @@ extern void get_new_mmu_context(struct mm_struct *mm);
  * This just needs to set mm->context to an invalid context.
  */
 #define init_new_context(__tsk, __mm)	\
-	(((__mm)->context.sparc64_ctx_val = 0UL), 0)
+({	unsigned long __pg = get_zeroed_page(GFP_KERNEL); \
+	(__mm)->context.sparc64_ctx_val = 0UL; \
+	(__mm)->context.sparc64_tsb = \
+	  (unsigned long *) __pg; \
+	(__pg ? 0 : -ENOMEM); \
+})
+
 
 /* Destroy a dead context.  This occurs when mmput drops the
  * mm_users count to zero, the mmaps have been released, and
@@ -35,7 +41,8 @@ extern void get_new_mmu_context(struct mm_struct *mm);
  * this task if valid.
  */
 #define destroy_context(__mm)					\
-do {	spin_lock(&ctx_alloc_lock);				\
+do {	free_page((unsigned long)(__mm)->context.sparc64_tsb);	\
+	spin_lock(&ctx_alloc_lock);				\
 	if (CTX_VALID((__mm)->context)) {			\
 		unsigned long nr = CTX_NRBITS((__mm)->context);	\
 		mmu_context_bmap[nr>>6] &= ~(1UL << (nr & 63));	\
@@ -43,35 +50,7 @@ do {	spin_lock(&ctx_alloc_lock);				\
 	spin_unlock(&ctx_alloc_lock);				\
 } while(0)
 
-/* Reload the two core values used by TLB miss handler
- * processing on sparc64.  They are:
- * 1) The physical address of mm->pgd, when full page
- *    table walks are necessary, this is where the
- *    search begins.
- * 2) A "PGD cache".  For 32-bit tasks only pgd[0] is
- *    ever used since that maps the entire low 4GB
- *    completely.  To speed up TLB miss processing we
- *    make this value available to the handlers.  This
- *    decreases the amount of memory traffic incurred.
- */
-#define reload_tlbmiss_state(__tsk, __mm) \
-do { \
-	register unsigned long paddr asm("o5"); \
-	register unsigned long pgd_cache asm("o4"); \
-	paddr = __pa((__mm)->pgd); \
-	pgd_cache = 0UL; \
-	if (task_thread_info(__tsk)->flags & _TIF_32BIT) \
-		pgd_cache = get_pgd_cache((__mm)->pgd); \
-	__asm__ __volatile__("wrpr	%%g0, 0x494, %%pstate\n\t" \
-			     "mov	%3, %%g4\n\t" \
-			     "mov	%0, %%g7\n\t" \
-			     "stxa	%1, [%%g4] %2\n\t" \
-			     "membar	#Sync\n\t" \
-			     "wrpr	%%g0, 0x096, %%pstate" \
-			     : /* no outputs */ \
-			     : "r" (paddr), "r" (pgd_cache),\
-			       "i" (ASI_DMMU), "i" (TSB_REG)); \
-} while(0)
+extern unsigned long tsb_context_switch(unsigned long pgd_pa, unsigned long *tsb);
 
 /* Set MMU context in the actual hardware. */
 #define load_secondary_context(__mm) \
@@ -101,7 +80,8 @@ static inline void switch_mm(struct mm_struct *old_mm, struct mm_struct *mm, str
 
 	if (!ctx_valid || (old_mm != mm)) {
 		load_secondary_context(mm);
-		reload_tlbmiss_state(tsk, mm);
+		tsb_context_switch(__pa(mm->pgd),
+				   mm->context.sparc64_tsb);
 	}
 
 	/* Even if (mm == old_mm) we _must_ check
@@ -139,7 +119,7 @@ static inline void activate_mm(struct mm_struct *active_mm, struct mm_struct *mm
 
 	load_secondary_context(mm);
 	__flush_tlb_mm(CTX_HWBITS(mm->context), SECONDARY_CONTEXT);
-	reload_tlbmiss_state(current, mm);
+	tsb_context_switch(__pa(mm->pgd), mm->context.sparc64_tsb);
 }
 
 #endif /* !(__ASSEMBLY__) */

include/asm-sparc64/pgalloc.h

@@ -61,6 +61,7 @@ static __inline__ void free_pgd_slow(pgd_t *pgd)
 	free_page((unsigned long)pgd);
 }
 
+/* XXX This crap can die, no longer using virtual page tables... */
 #ifdef DCACHE_ALIASING_POSSIBLE
 #define VPTE_COLOR(address)		(((address) >> (PAGE_SHIFT + 10)) & 1UL)
 #define DCACHE_COLOR(address)		(((address) >> PAGE_SHIFT) & 1UL)

include/asm-sparc64/pgtable.h

@@ -25,7 +25,8 @@
 #include <asm/const.h>
 
 /* The kernel image occupies 0x4000000 to 0x1000000 (4MB --> 32MB).
- * The page copy blockops can use 0x2000000 to 0x10000000.
+ * The page copy blockops can use 0x2000000 to 0x4000000.
+ * The TSB is mapped in the 0x4000000 to 0x6000000 range.
  * The PROM resides in an area spanning 0xf0000000 to 0x100000000.
  * The vmalloc area spans 0x100000000 to 0x200000000.
  * Since modules need to be in the lowest 32-bits of the address space,
@@ -34,6 +35,7 @@
  * 0x400000000.
  */
 #define	TLBTEMP_BASE		_AC(0x0000000002000000,UL)
+#define	TSBMAP_BASE		_AC(0x0000000004000000,UL)
 #define MODULES_VADDR		_AC(0x0000000010000000,UL)
 #define MODULES_LEN		_AC(0x00000000e0000000,UL)
 #define MODULES_END		_AC(0x00000000f0000000,UL)
@@ -296,11 +298,6 @@ static inline pte_t pte_modify(pte_t orig_pte, pgprot_t new_prot)
 /* to find an entry in a kernel page-table-directory */
 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
 
-/* extract the pgd cache used for optimizing the tlb miss
- * slow path when executing 32-bit compat processes
- */
-#define get_pgd_cache(pgd)	((unsigned long) pgd_val(*pgd) << 11)
-
 /* Find an entry in the second-level page table.. */
 #define pmd_offset(pudp, address)	\
 	((pmd_t *) pud_page(*(pudp)) + \

include/asm-sparc64/processor.h

@@ -28,6 +28,8 @@
  * User lives in his very own context, and cannot reference us. Note
  * that TASK_SIZE is a misnomer, it really gives maximum user virtual 
  * address that the kernel will allocate out.
+ *
+ * XXX No longer using virtual page tables, kill this upper limit...
  */
 #define VA_BITS		44
 #ifndef __ASSEMBLY__
@@ -37,18 +39,6 @@
 #endif
 #define TASK_SIZE	((unsigned long)-VPTE_SIZE)
 
-/*
- * The vpte base must be able to hold the entire vpte, half
- * of which lives above, and half below, the base. And it
- * is placed as close to the highest address range as possible.
- */
-#define VPTE_BASE_SPITFIRE	(-(VPTE_SIZE/2))
-#if 1
-#define VPTE_BASE_CHEETAH	VPTE_BASE_SPITFIRE
-#else
-#define VPTE_BASE_CHEETAH	0xffe0000000000000
-#endif
-
 #ifndef __ASSEMBLY__
 
 typedef struct {

include/asm-sparc64/tlbflush.h

@@ -5,6 +5,11 @@
 #include <linux/mm.h>
 #include <asm/mmu_context.h>
 
+/* TSB flush operations. */
+struct mmu_gather;
+extern void flush_tsb_kernel_range(unsigned long start, unsigned long end);
+extern void flush_tsb_user(struct mmu_gather *mp);
+
 /* TLB flush operations. */
 
 extern void flush_tlb_pending(void);
@@ -14,28 +19,36 @@ extern void flush_tlb_pending(void);
 #define flush_tlb_page(vma,addr)	flush_tlb_pending()
 #define flush_tlb_mm(mm)		flush_tlb_pending()
 
+/* Local cpu only.  */
 extern void __flush_tlb_all(void);
+
 extern void __flush_tlb_page(unsigned long context, unsigned long page, unsigned long r);
 
 extern void __flush_tlb_kernel_range(unsigned long start, unsigned long end);
 
 #ifndef CONFIG_SMP
 
-#define flush_tlb_all()		__flush_tlb_all()
 #define flush_tlb_kernel_range(start,end) \
-	__flush_tlb_kernel_range(start,end)
+do {	flush_tsb_kernel_range(start,end); \
+	__flush_tlb_kernel_range(start,end); \
+} while (0)
 
 #else /* CONFIG_SMP */
 
-extern void smp_flush_tlb_all(void);
 extern void smp_flush_tlb_kernel_range(unsigned long start, unsigned long end);
 
-#define flush_tlb_all()		smp_flush_tlb_all()
 #define flush_tlb_kernel_range(start, end) \
-	smp_flush_tlb_kernel_range(start, end)
+do {	flush_tsb_kernel_range(start,end); \
+	smp_flush_tlb_kernel_range(start, end); \
+} while (0)
 
 #endif /* ! CONFIG_SMP */
 
-extern void flush_tlb_pgtables(struct mm_struct *, unsigned long, unsigned long);
+static inline void flush_tlb_pgtables(struct mm_struct *mm, unsigned long start, unsigned long end)
+{
+	/* We don't use virtual page tables for TLB miss processing
+	 * any more.  Nowadays we use the TSB.
+	 */
+}
 
 #endif /* _SPARC64_TLBFLUSH_H */

include/asm-sparc64/tsb.h

@@ -0,0 +1,165 @@
+#ifndef _SPARC64_TSB_H
+#define _SPARC64_TSB_H
+
+/* The sparc64 TSB is similar to the powerpc hashtables.  It's a
+ * power-of-2 sized table of TAG/PTE pairs.  The cpu precomputes
+ * pointers into this table for 8K and 64K page sizes, and also a
+ * comparison TAG based upon the virtual address and context which
+ * faults.
+ *
+ * TLB miss trap handler software does the actual lookup via something
+ * of the form:
+ *
+ * 	ldxa		[%g0] ASI_{D,I}MMU_TSB_8KB_PTR, %g1
+ * 	ldxa		[%g0] ASI_{D,I}MMU, %g6
+ * 	ldda		[%g1] ASI_NUCLEUS_QUAD_LDD, %g4
+ * 	cmp		%g4, %g6
+ * 	bne,pn	%xcc, tsb_miss_{d,i}tlb
+ * 	 mov		FAULT_CODE_{D,I}TLB, %g3
+ * 	stxa		%g5, [%g0] ASI_{D,I}TLB_DATA_IN
+ * 	retry
+ *
+
+ * Each 16-byte slot of the TSB is the 8-byte tag and then the 8-byte
+ * PTE.  The TAG is of the same layout as the TLB TAG TARGET mmu
+ * register which is:
+ *
+ * -------------------------------------------------
+ * |  -  |  CONTEXT |  -  |    VADDR bits 63:22    |
+ * -------------------------------------------------
+ *  63 61 60      48 47 42 41                     0
+ *
+ * Like the powerpc hashtables we need to use locking in order to
+ * synchronize while we update the entries.  PTE updates need locking
+ * as well.
+ *
+ * We need to carefully choose a lock bits for the TSB entry.  We
+ * choose to use bit 47 in the tag.  Also, since we never map anything
+ * at page zero in context zero, we use zero as an invalid tag entry.
+ * When the lock bit is set, this forces a tag comparison failure.
+ *
+ * Currently, we allocate an 8K TSB per-process and we use it for both
+ * I-TLB and D-TLB misses.  Perhaps at some point we'll add code that
+ * monitors the number of active pages in the process as we get
+ * major/minor faults, and grow the TSB in response.  The only trick
+ * in implementing that is synchronizing the freeing of the old TSB
+ * wrt.  parallel TSB updates occuring on other processors.  On
+ * possible solution is to use RCU for the freeing of the TSB.
+ */
+
+#define TSB_TAG_LOCK	(1 << (47 - 32))
+
+#define TSB_MEMBAR	membar	#StoreStore
+
+#define TSB_LOCK_TAG(TSB, REG1, REG2)	\
+99:	lduwa	[TSB] ASI_N, REG1;	\
+	sethi	%hi(TSB_TAG_LOCK), REG2;\
+	andcc	REG1, REG2, %g0;	\
+	bne,pn	%icc, 99b;		\
+	 nop;				\
+	casa	[TSB] ASI_N, REG1, REG2;\
+	cmp	REG1, REG2;		\
+	bne,pn	%icc, 99b;		\
+	 nop;				\
+	TSB_MEMBAR
+
+#define TSB_WRITE(TSB, TTE, TAG)	   \
+	stx		TTE, [TSB + 0x08]; \
+	TSB_MEMBAR;			   \
+	stx		TAG, [TSB + 0x00];
+
+	/* Do a kernel page table walk.  Leaves physical PTE pointer in
+	 * REG1.  Jumps to FAIL_LABEL on early page table walk termination.
+	 * VADDR will not be clobbered, but REG2 will.
+	 */
+#define KERN_PGTABLE_WALK(VADDR, REG1, REG2, FAIL_LABEL)	\
+	sethi		%hi(swapper_pg_dir), REG1; \
+	or		REG1, %lo(swapper_pg_dir), REG1; \
+	sllx		VADDR, 64 - (PGDIR_SHIFT + PGDIR_BITS), REG2; \
+	srlx		REG2, 64 - PAGE_SHIFT, REG2; \
+	andn		REG2, 0x3, REG2; \
+	lduw		[REG1 + REG2], REG1; \
+	brz,pn		REG1, FAIL_LABEL; \
+	 sllx		VADDR, 64 - (PMD_SHIFT + PMD_BITS), REG2; \
+	srlx		REG2, 64 - PAGE_SHIFT, REG2; \
+	sllx		REG1, 11, REG1; \
+	andn		REG2, 0x3, REG2; \
+	lduwa		[REG1 + REG2] ASI_PHYS_USE_EC, REG1; \
+	brz,pn		REG1, FAIL_LABEL; \
+	 sllx		VADDR, 64 - PMD_SHIFT, REG2; \
+	srlx		REG2, 64 - PAGE_SHIFT, REG2; \
+	sllx		REG1, 11, REG1; \
+	andn		REG2, 0x7, REG2; \
+	add		REG1, REG2, REG1;
+
+	/* Do a user page table walk in MMU globals.  Leaves physical PTE
+	 * pointer in REG1.  Jumps to FAIL_LABEL on early page table walk
+	 * termination.  Physical base of page tables is in PHYS_PGD which
+	 * will not be modified.
+	 *
+	 * VADDR will not be clobbered, but REG1 and REG2 will.
+	 */
+#define USER_PGTABLE_WALK_TL1(VADDR, PHYS_PGD, REG1, REG2, FAIL_LABEL)	\
+	sllx		VADDR, 64 - (PGDIR_SHIFT + PGDIR_BITS), REG2; \
+	srlx		REG2, 64 - PAGE_SHIFT, REG2; \
+	andn		REG2, 0x3, REG2; \
+	lduwa		[PHYS_PGD + REG2] ASI_PHYS_USE_EC, REG1; \
+	brz,pn		REG1, FAIL_LABEL; \
+	 sllx		VADDR, 64 - (PMD_SHIFT + PMD_BITS), REG2; \
+	srlx		REG2, 64 - PAGE_SHIFT, REG2; \
+	sllx		REG1, 11, REG1; \
+	andn		REG2, 0x3, REG2; \
+	lduwa		[REG1 + REG2] ASI_PHYS_USE_EC, REG1; \
+	brz,pn		REG1, FAIL_LABEL; \
+	 sllx		VADDR, 64 - PMD_SHIFT, REG2; \
+	srlx		REG2, 64 - PAGE_SHIFT, REG2; \
+	sllx		REG1, 11, REG1; \
+	andn		REG2, 0x7, REG2; \
+	add		REG1, REG2, REG1;
+
+/* Lookup a OBP mapping on VADDR in the prom_trans[] table at TL>0.
+ * If no entry is found, FAIL_LABEL will be branched to.  On success
+ * the resulting PTE value will be left in REG1.  VADDR is preserved
+ * by this routine.
+ */
+#define OBP_TRANS_LOOKUP(VADDR, REG1, REG2, REG3, FAIL_LABEL) \
+	sethi		%hi(prom_trans), REG1; \
+	or		REG1, %lo(prom_trans), REG1; \
+97:	ldx		[REG1 + 0x00], REG2; \
+	brz,pn		REG2, FAIL_LABEL; \
+	 nop; \
+	ldx		[REG1 + 0x08], REG3; \
+	add		REG2, REG3, REG3; \
+	cmp		REG2, VADDR; \
+	bgu,pt		%xcc, 98f; \
+	 cmp		VADDR, REG3; \
+	bgeu,pt		%xcc, 98f; \
+	 ldx		[REG1 + 0x10], REG3; \
+	sub		VADDR, REG2, REG2; \
+	ba,pt		%xcc, 99f; \
+	 add		REG3, REG2, REG1; \
+98:	ba,pt		%xcc, 97b; \
+	 add		REG1, (3 * 8), REG1; \
+99:
+
+	/* Do a kernel TSB lookup at tl>0 on VADDR+TAG, branch to OK_LABEL
+	 * on TSB hit.  REG1, REG2, REG3, and REG4 are used as temporaries
+	 * and the found TTE will be left in REG1.  REG3 and REG4 must
+	 * be an even/odd pair of registers.
+	 *
+	 * VADDR and TAG will be preserved and not clobbered by this macro.
+	 */
+	/* XXX non-8K base page size support... */
+#define KERN_TSB_LOOKUP_TL1(VADDR, TAG, REG1, REG2, REG3, REG4, OK_LABEL) \
+	sethi		%hi(swapper_tsb), REG1; \
+	or		REG1, %lo(swapper_tsb), REG1; \
+	srlx		VADDR, 13, REG2; \
+	and		REG2, (512 - 1), REG2; \
+	sllx		REG2, 4, REG2; \
+	add		REG1, REG2, REG2; \
+	ldda		[REG2] ASI_NUCLEUS_QUAD_LDD, REG3; \
+	cmp		REG3, TAG; \
+	be,a,pt		%xcc, OK_LABEL; \
+	 mov		REG4, REG1;
+
+#endif /* !(_SPARC64_TSB_H) */