Merge ../linux-2.6

1 files changed, 442 insertions, 0 deletions

diff --git a/arch/sparc64/kernel/tsb.S b/arch/sparc64/kernel/tsb.S
new file mode 100644
index 000000000000..118baea44f69
--- /dev/null
+++ b/arch/sparc64/kernel/tsb.S
@@ -0,0 +1,442 @@
+/* tsb.S: Sparc64 TSB table handling.
+ *
+ * Copyright (C) 2006 David S. Miller <davem@davemloft.net>
+ */
+
+#include <asm/tsb.h>
+#include <asm/hypervisor.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:	available temporary, will be loaded by us with
+	 *      the physical address base of the linux page
+	 *      tables for the current address space
+	 */
+tsb_miss_dtlb:
+	mov		TLB_TAG_ACCESS, %g4
+	ba,pt		%xcc, tsb_miss_page_table_walk
+	 ldxa		[%g4] ASI_DMMU, %g4
+
+tsb_miss_itlb:
+	mov		TLB_TAG_ACCESS, %g4
+	ba,pt		%xcc, tsb_miss_page_table_walk
+	 ldxa		[%g4] ASI_IMMU, %g4
+
+	/* At this point we have:
+	 * %g1 --	TSB entry address
+	 * %g3 --	FAULT_CODE_{D,I}TLB
+	 * %g4 --	missing virtual address
+	 * %g6 --	TAG TARGET (vaddr >> 22)
+	 */
+tsb_miss_page_table_walk:
+	TRAP_LOAD_PGD_PHYS(%g7, %g5)
+
+	/* And now we have the PGD base physical address in %g7.  */
+tsb_miss_page_table_walk_sun4v_fastpath:
+	USER_PGTABLE_WALK_TL1(%g4, %g7, %g5, %g2, tsb_do_fault)
+
+	/* At this point we have:
+	 * %g1 --	TSB entry address
+	 * %g3 --	FAULT_CODE_{D,I}TLB
+	 * %g5 --	physical address of PTE in Linux page tables
+	 * %g6 --	TAG TARGET (vaddr >> 22)
+	 */
+tsb_reload:
+	TSB_LOCK_TAG(%g1, %g2, %g7)
+
+	/* Load and check PTE.  */
+	ldxa		[%g5] ASI_PHYS_USE_EC, %g5
+	mov		1, %g7
+	sllx		%g7, TSB_TAG_INVALID_BIT, %g7
+	brgez,a,pn	%g5, tsb_do_fault
+	 TSB_STORE(%g1, %g7)
+
+	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:
+
+661:	stxa		%g5, [%g0] ASI_DTLB_DATA_IN
+	retry
+	.section	.sun4v_2insn_patch, "ax"
+	.word		661b
+	nop
+	nop
+	.previous
+
+	/* For sun4v the ASI_DTLB_DATA_IN store and the retry
+	 * instruction get nop'd out and we get here to branch
+	 * to the sun4v tlb load code.  The registers are setup
+	 * as follows:
+	 *
+	 * %g4: vaddr
+	 * %g5: PTE
+	 * %g6:	TAG
+	 *
+	 * The sun4v TLB load wants the PTE in %g3 so we fix that
+	 * up here.
+	 */
+	ba,pt		%xcc, sun4v_dtlb_load
+	 mov		%g5, %g3
+
+tsb_itlb_load:
+	/* Executable bit must be set.  */
+661:	andcc		%g5, _PAGE_EXEC_4U, %g0
+	.section	.sun4v_1insn_patch, "ax"
+	.word		661b
+	andcc		%g5, _PAGE_EXEC_4V, %g0
+	.previous
+
+	be,pn		%xcc, tsb_do_fault
+	 nop
+
+661:	stxa		%g5, [%g0] ASI_ITLB_DATA_IN
+	retry
+	.section	.sun4v_2insn_patch, "ax"
+	.word		661b
+	nop
+	nop
+	.previous
+
+	/* For sun4v the ASI_ITLB_DATA_IN store and the retry
+	 * instruction get nop'd out and we get here to branch
+	 * to the sun4v tlb load code.  The registers are setup
+	 * as follows:
+	 *
+	 * %g4: vaddr
+	 * %g5: PTE
+	 * %g6:	TAG
+	 *
+	 * The sun4v TLB load wants the PTE in %g3 so we fix that
+	 * up here.
+	 */
+	ba,pt		%xcc, sun4v_itlb_load
+	 mov		%g5, %g3
+
+	/* No valid entry in the page tables, do full fault
+	 * processing.
+	 */
+
+	.globl		tsb_do_fault
+tsb_do_fault:
+	cmp		%g3, FAULT_CODE_DTLB
+
+661:	rdpr		%pstate, %g5
+	wrpr		%g5, PSTATE_AG | PSTATE_MG, %pstate
+	.section	.sun4v_2insn_patch, "ax"
+	.word		661b
+	SET_GL(1)
+	ldxa		[%g0] ASI_SCRATCHPAD, %g4
+	.previous
+
+	bne,pn		%xcc, tsb_do_itlb_fault
+	 nop
+
+tsb_do_dtlb_fault:
+	rdpr	%tl, %g3
+	cmp	%g3, 1
+
+661:	mov	TLB_TAG_ACCESS, %g4
+	ldxa	[%g4] ASI_DMMU, %g5
+	.section .sun4v_2insn_patch, "ax"
+	.word	661b
+	ldx	[%g4 + HV_FAULT_D_ADDR_OFFSET], %g5
+	nop
+	.previous
+
+	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:
+	/* fault code in %g4, fault address in %g5, etrap will
+	 * preserve these two values in %l4 and %l5 respectively
+	 */
+	ba,pt	%xcc, etrap			! Save trap state
+1:	 rd	%pc, %g7			! ...
+	stb	%l4, [%g6 + TI_FAULT_CODE]	! Save fault code
+	stx	%l5, [%g6 + TI_FAULT_ADDR]	! Save fault address
+	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)
+
+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
+
+	/* Insert an entry into the TSB.
+	 *
+	 * %o0: TSB entry pointer (virt or phys address)
+	 * %o1: tag
+	 * %o2:	pte
+	 */
+	.align	32
+	.globl	__tsb_insert
+__tsb_insert:
+	rdpr	%pstate, %o5
+	wrpr	%o5, PSTATE_IE, %pstate
+	TSB_LOCK_TAG(%o0, %g2, %g3)
+	TSB_WRITE(%o0, %o2, %o1)
+	wrpr	%o5, %pstate
+	retl
+	 nop
+	.size	__tsb_insert, .-__tsb_insert
+
+	/* Flush the given TSB entry if it has the matching
+	 * tag.
+	 *
+	 * %o0: TSB entry pointer (virt or phys address)
+	 * %o1:	tag
+	 */
+	.align	32
+	.globl	tsb_flush
+	.type	tsb_flush,#function
+tsb_flush:
+	sethi	%hi(TSB_TAG_LOCK_HIGH), %g2
+1:	TSB_LOAD_TAG(%o0, %g1)
+	srlx	%g1, 32, %o3
+	andcc	%o3, %g2, %g0
+	bne,pn	%icc, 1b
+	 membar	#LoadLoad
+	cmp	%g1, %o1
+	mov	1, %o3
+	bne,pt	%xcc, 2f
+	 sllx	%o3, TSB_TAG_INVALID_BIT, %o3
+	TSB_CAS_TAG(%o0, %g1, %o3)
+	cmp	%g1, %o3
+	bne,pn	%xcc, 1b
+	 nop
+2:	retl
+	 TSB_MEMBAR
+	.size	tsb_flush, .-tsb_flush
+
+	/* Reload MMU related context switch state at
+	 * schedule() time.
+	 *
+	 * %o0: page table physical address
+	 * %o1:	TSB register value
+	 * %o2:	TSB virtual address
+	 * %o3:	TSB mapping locked PTE
+	 * %o4:	Hypervisor TSB descriptor physical address
+	 *
+	 * We have to run this whole thing with interrupts
+	 * disabled so that the current cpu doesn't change
+	 * due to preemption.
+	 */
+	.align	32
+	.globl	__tsb_context_switch
+	.type	__tsb_context_switch,#function
+__tsb_context_switch:
+	rdpr	%pstate, %o5
+	wrpr	%o5, PSTATE_IE, %pstate
+
+	ldub	[%g6 + TI_CPU], %g1
+	sethi	%hi(trap_block), %g2
+	sllx	%g1, TRAP_BLOCK_SZ_SHIFT, %g1
+	or	%g2, %lo(trap_block), %g2
+	add	%g2, %g1, %g2
+	stx	%o0, [%g2 + TRAP_PER_CPU_PGD_PADDR]
+
+	sethi	%hi(tlb_type), %g1
+	lduw	[%g1 + %lo(tlb_type)], %g1
+	cmp	%g1, 3
+	bne,pt	%icc, 1f
+	 nop
+
+	/* Hypervisor TSB switch. */
+	mov	SCRATCHPAD_UTSBREG1, %g1
+	stxa	%o1, [%g1] ASI_SCRATCHPAD
+	mov	-1, %g2
+	mov	SCRATCHPAD_UTSBREG2, %g1
+	stxa	%g2, [%g1] ASI_SCRATCHPAD
+
+	/* Save away %o5's %pstate, we have to use %o5 for
+	 * the hypervisor call.
+	 */
+	mov	%o5, %g1
+
+	mov	HV_FAST_MMU_TSB_CTXNON0, %o5
+	mov	1, %o0
+	mov	%o4, %o1
+	ta	HV_FAST_TRAP
+
+	/* Finish up and restore %o5.  */
+	ba,pt	%xcc, 9f
+	 mov	%g1, %o5
+
+	/* SUN4U TSB switch.  */
+1:	mov	TSB_REG, %g1
+	stxa	%o1, [%g1] ASI_DMMU
+	membar	#Sync
+	stxa	%o1, [%g1] ASI_IMMU
+	membar	#Sync
+
+2:	brz	%o2, 9f
+	 nop
+
+	sethi	%hi(sparc64_highest_unlocked_tlb_ent), %g2
+	mov	TLB_TAG_ACCESS, %g1
+	lduw	[%g2 + %lo(sparc64_highest_unlocked_tlb_ent)], %g2
+	stxa	%o2, [%g1] ASI_DMMU
+	membar	#Sync
+	sllx	%g2, 3, %g2
+	stxa	%o3, [%g2] ASI_DTLB_DATA_ACCESS
+	membar	#Sync
+9:
+	wrpr	%o5, %pstate
+
+	retl
+	 nop
+	.size	__tsb_context_switch, .-__tsb_context_switch
+
+#define TSB_PASS_BITS	((1 << TSB_TAG_LOCK_BIT) | \
+			 (1 << TSB_TAG_INVALID_BIT))
+
+	.align	32
+	.globl	copy_tsb
+	.type	copy_tsb,#function
+copy_tsb:		/* %o0=old_tsb_base, %o1=old_tsb_size
+			 * %o2=new_tsb_base, %o3=new_tsb_size
+			 */
+	sethi		%uhi(TSB_PASS_BITS), %g7
+	srlx		%o3, 4, %o3
+	add		%o0, %o1, %g1	/* end of old tsb */
+	sllx		%g7, 32, %g7
+	sub		%o3, 1, %o3	/* %o3 == new tsb hash mask */
+
+661:	prefetcha	[%o0] ASI_N, #one_read
+	.section	.tsb_phys_patch, "ax"
+	.word		661b
+	prefetcha	[%o0] ASI_PHYS_USE_EC, #one_read
+	.previous
+
+90:	andcc		%o0, (64 - 1), %g0
+	bne		1f
+	 add		%o0, 64, %o5
+
+661:	prefetcha	[%o5] ASI_N, #one_read
+	.section	.tsb_phys_patch, "ax"
+	.word		661b
+	prefetcha	[%o5] ASI_PHYS_USE_EC, #one_read
+	.previous
+
+1:	TSB_LOAD_QUAD(%o0, %g2)		/* %g2/%g3 == TSB entry */
+	andcc		%g2, %g7, %g0	/* LOCK or INVALID set? */
+	bne,pn		%xcc, 80f	/* Skip it */
+	 sllx		%g2, 22, %o4	/* TAG --> VADDR */
+
+	/* This can definitely be computed faster... */
+	srlx		%o0, 4, %o5	/* Build index */
+	and		%o5, 511, %o5	/* Mask index */
+	sllx		%o5, PAGE_SHIFT, %o5 /* Put into vaddr position */
+	or		%o4, %o5, %o4	/* Full VADDR. */
+	srlx		%o4, PAGE_SHIFT, %o4 /* Shift down to create index */
+	and		%o4, %o3, %o4	/* Mask with new_tsb_nents-1 */
+	sllx		%o4, 4, %o4	/* Shift back up into tsb ent offset */
+	TSB_STORE(%o2 + %o4, %g2)	/* Store TAG */
+	add		%o4, 0x8, %o4	/* Advance to TTE */
+	TSB_STORE(%o2 + %o4, %g3)	/* Store TTE */
+
+80:	add		%o0, 16, %o0
+	cmp		%o0, %g1
+	bne,pt		%xcc, 90b
+	 nop
+
+	retl
+	 TSB_MEMBAR
+	.size		copy_tsb, .-copy_tsb
+
+	/* Set the invalid bit in all TSB entries.  */
+	.align		32
+	.globl		tsb_init
+	.type		tsb_init,#function
+tsb_init:		/* %o0 = TSB vaddr, %o1 = size in bytes */
+	prefetch	[%o0 + 0x000], #n_writes
+	mov		1, %g1
+	prefetch	[%o0 + 0x040], #n_writes
+	sllx		%g1, TSB_TAG_INVALID_BIT, %g1
+	prefetch	[%o0 + 0x080], #n_writes
+1:	prefetch	[%o0 + 0x0c0], #n_writes
+	stx		%g1, [%o0 + 0x00]
+	stx		%g1, [%o0 + 0x10]
+	stx		%g1, [%o0 + 0x20]
+	stx		%g1, [%o0 + 0x30]
+	prefetch	[%o0 + 0x100], #n_writes
+	stx		%g1, [%o0 + 0x40]
+	stx		%g1, [%o0 + 0x50]
+	stx		%g1, [%o0 + 0x60]
+	stx		%g1, [%o0 + 0x70]
+	prefetch	[%o0 + 0x140], #n_writes
+	stx		%g1, [%o0 + 0x80]
+	stx		%g1, [%o0 + 0x90]
+	stx		%g1, [%o0 + 0xa0]
+	stx		%g1, [%o0 + 0xb0]
+	prefetch	[%o0 + 0x180], #n_writes
+	stx		%g1, [%o0 + 0xc0]
+	stx		%g1, [%o0 + 0xd0]
+	stx		%g1, [%o0 + 0xe0]
+	stx		%g1, [%o0 + 0xf0]
+	subcc		%o1, 0x100, %o1
+	bne,pt		%xcc, 1b
+	 add		%o0, 0x100, %o0
+	retl
+	 nop
+	nop
+	nop
+	.size		tsb_init, .-tsb_init
+
+	.globl		NGtsb_init
+	.type		NGtsb_init,#function
+NGtsb_init:
+	rd		%asi, %g2
+	mov		1, %g1
+	wr		%g0, ASI_BLK_INIT_QUAD_LDD_P, %asi
+	sllx		%g1, TSB_TAG_INVALID_BIT, %g1
+1:	stxa		%g1, [%o0 + 0x00] %asi
+	stxa		%g1, [%o0 + 0x10] %asi
+	stxa		%g1, [%o0 + 0x20] %asi
+	stxa		%g1, [%o0 + 0x30] %asi
+	stxa		%g1, [%o0 + 0x40] %asi
+	stxa		%g1, [%o0 + 0x50] %asi
+	stxa		%g1, [%o0 + 0x60] %asi
+	stxa		%g1, [%o0 + 0x70] %asi
+	stxa		%g1, [%o0 + 0x80] %asi
+	stxa		%g1, [%o0 + 0x90] %asi
+	stxa		%g1, [%o0 + 0xa0] %asi
+	stxa		%g1, [%o0 + 0xb0] %asi
+	stxa		%g1, [%o0 + 0xc0] %asi
+	stxa		%g1, [%o0 + 0xd0] %asi
+	stxa		%g1, [%o0 + 0xe0] %asi
+	stxa		%g1, [%o0 + 0xf0] %asi
+	subcc		%o1, 0x100, %o1
+	bne,pt		%xcc, 1b
+	 add		%o0, 0x100, %o0
+	retl
+	 wr		%g2, 0x0, %asi
+	.size		NGtsb_init, .-NGtsb_init