sparc,sparc64: unify kernel/

o Move all files from sparc64/kernel/ to sparc/kernel
  - rename as appropriate
o Update sparc/Makefile to the changes
o Update sparc/kernel/Makefile to include the sparc64 files

NOTE: This commit changes link order on sparc64!

Link order had to change for either of sparc32 and sparc64.
And assuming sparc64 see more testing than sparc32 change link
order on sparc64 where issues will be caught faster.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 304 insertions, 0 deletions

diff --git a/arch/sparc/kernel/ktlb.S b/arch/sparc/kernel/ktlb.S
new file mode 100644
index 00000000000..cef8defcd7a
--- /dev/null
+++ b/arch/sparc/kernel/ktlb.S
@@ -0,0 +1,304 @@
+/* arch/sparc64/kernel/ktlb.S: Kernel mapping TLB miss handling.
+ *
+ * Copyright (C) 1995, 1997, 2005, 2008 David S. Miller <davem@davemloft.net>
+ * 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 <asm/head.h>
+#include <asm/asi.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/tsb.h>
+
+	.text
+	.align		32
+
+kvmap_itlb:
+	/* g6: TAG TARGET */
+	mov		TLB_TAG_ACCESS, %g4
+	ldxa		[%g4] ASI_IMMU, %g4
+
+	/* sun4v_itlb_miss branches here with the missing virtual
+	 * address already loaded into %g4
+	 */
+kvmap_itlb_4v:
+
+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, kvmap_itlb_vmalloc_addr
+	 mov		0x1, %g5
+	sllx		%g5, 32, %g5
+	cmp		%g4, %g5
+	blu,pn		%xcc, kvmap_itlb_obp
+	 nop
+
+kvmap_itlb_vmalloc_addr:
+	KERN_PGTABLE_WALK(%g4, %g5, %g2, kvmap_itlb_longpath)
+
+	KTSB_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, kvmap_itlb_longpath
+	 KTSB_STORE(%g1, %g7)
+
+	KTSB_WRITE(%g1, %g5, %g6)
+
+	/* fallthrough to TLB load */
+
+kvmap_itlb_load:
+
+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
+
+kvmap_itlb_longpath:
+
+661:	rdpr	%pstate, %g5
+	wrpr	%g5, PSTATE_AG | PSTATE_MG, %pstate
+	.section .sun4v_2insn_patch, "ax"
+	.word	661b
+	SET_GL(1)
+	nop
+	.previous
+
+	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)
+
+	KTSB_LOCK_TAG(%g1, %g2, %g7)
+
+	KTSB_WRITE(%g1, %g5, %g6)
+
+	ba,pt		%xcc, kvmap_itlb_load
+	 nop
+
+kvmap_dtlb_obp:
+	OBP_TRANS_LOOKUP(%g4, %g5, %g2, %g3, kvmap_dtlb_longpath)
+
+	KTSB_LOCK_TAG(%g1, %g2, %g7)
+
+	KTSB_WRITE(%g1, %g5, %g6)
+
+	ba,pt		%xcc, kvmap_dtlb_load
+	 nop
+
+	.align		32
+kvmap_dtlb_tsb4m_load:
+	KTSB_LOCK_TAG(%g1, %g2, %g7)
+	KTSB_WRITE(%g1, %g5, %g6)
+	ba,pt		%xcc, kvmap_dtlb_load
+	 nop
+
+kvmap_dtlb:
+	/* %g6: TAG TARGET */
+	mov		TLB_TAG_ACCESS, %g4
+	ldxa		[%g4] ASI_DMMU, %g4
+
+	/* sun4v_dtlb_miss branches here with the missing virtual
+	 * address already loaded into %g4
+	 */
+kvmap_dtlb_4v:
+	brgez,pn	%g4, kvmap_dtlb_nonlinear
+	 nop
+
+#ifdef CONFIG_DEBUG_PAGEALLOC
+	/* Index through the base page size TSB even for linear
+	 * mappings when using page allocation debugging.
+	 */
+	KERN_TSB_LOOKUP_TL1(%g4, %g6, %g5, %g1, %g2, %g3, kvmap_dtlb_load)
+#else
+	/* Correct TAG_TARGET is already in %g6, check 4mb TSB.  */
+	KERN_TSB4M_LOOKUP_TL1(%g6, %g5, %g1, %g2, %g3, kvmap_dtlb_load)
+#endif
+	/* TSB entry address left in %g1, lookup linear PTE.
+	 * Must preserve %g1 and %g6 (TAG).
+	 */
+kvmap_dtlb_tsb4m_miss:
+	sethi		%hi(kpte_linear_bitmap), %g2
+	or		%g2, %lo(kpte_linear_bitmap), %g2
+
+	/* Clear the PAGE_OFFSET top virtual bits, then shift
+	 * down to get a 256MB physical address index.
+	 */
+	sllx		%g4, 21, %g5
+	mov		1, %g7
+	srlx		%g5, 21 + 28, %g5
+
+	/* Don't try this at home kids... this depends upon srlx
+	 * only taking the low 6 bits of the shift count in %g5.
+	 */
+	sllx		%g7, %g5, %g7
+
+	/* Divide by 64 to get the offset into the bitmask.  */
+	srlx		%g5, 6, %g5
+	sllx		%g5, 3, %g5
+
+	/* kern_linear_pte_xor[((mask & bit) ? 1 : 0)] */
+	ldx		[%g2 + %g5], %g2
+	andcc		%g2, %g7, %g0
+	sethi		%hi(kern_linear_pte_xor), %g5
+	or		%g5, %lo(kern_linear_pte_xor), %g5
+	bne,a,pt	%xcc, 1f
+	 add		%g5, 8, %g5
+
+1:	ldx		[%g5], %g2
+
+	.globl		kvmap_linear_patch
+kvmap_linear_patch:
+	ba,pt		%xcc, kvmap_dtlb_tsb4m_load
+	 xor		%g2, %g4, %g5
+
+kvmap_dtlb_vmalloc_addr:
+	KERN_PGTABLE_WALK(%g4, %g5, %g2, kvmap_dtlb_longpath)
+
+	KTSB_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, kvmap_dtlb_longpath
+	 KTSB_STORE(%g1, %g7)
+
+	KTSB_WRITE(%g1, %g5, %g6)
+
+	/* fallthrough to TLB load */
+
+kvmap_dtlb_load:
+
+661:	stxa		%g5, [%g0] ASI_DTLB_DATA_IN	! Reload TLB
+	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
+
+#ifdef CONFIG_SPARSEMEM_VMEMMAP
+kvmap_vmemmap:
+	sub		%g4, %g5, %g5
+	srlx		%g5, 22, %g5
+	sethi		%hi(vmemmap_table), %g1
+	sllx		%g5, 3, %g5
+	or		%g1, %lo(vmemmap_table), %g1
+	ba,pt		%xcc, kvmap_dtlb_load
+	 ldx		[%g1 + %g5], %g5
+#endif
+
+kvmap_dtlb_nonlinear:
+	/* Catch kernel NULL pointer derefs.  */
+	sethi		%hi(PAGE_SIZE), %g5
+	cmp		%g4, %g5
+	bleu,pn		%xcc, kvmap_dtlb_longpath
+	 nop
+
+#ifdef CONFIG_SPARSEMEM_VMEMMAP
+	/* Do not use the TSB for vmemmap.  */
+	mov		(VMEMMAP_BASE >> 24), %g5
+	sllx		%g5, 24, %g5
+	cmp		%g4,%g5
+	bgeu,pn		%xcc, kvmap_vmemmap
+	 nop
+#endif
+
+	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, kvmap_dtlb_longpath
+	 mov		(VMALLOC_END >> 24), %g5
+	sllx		%g5, 24, %g5
+	cmp		%g4, %g5
+	bgeu,pn		%xcc, kvmap_dtlb_longpath
+	 nop
+
+kvmap_check_obp:
+	sethi		%hi(LOW_OBP_ADDRESS), %g5
+	cmp		%g4, %g5
+	blu,pn		%xcc, kvmap_dtlb_vmalloc_addr
+	 mov		0x1, %g5
+	sllx		%g5, 32, %g5
+	cmp		%g4, %g5
+	blu,pn		%xcc, kvmap_dtlb_obp
+	 nop
+	ba,pt		%xcc, kvmap_dtlb_vmalloc_addr
+	 nop
+
+kvmap_dtlb_longpath:
+
+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, %g5
+	.previous
+
+	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	[%g5 + 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