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Diffstat (limited to 'arch/powerpc/mm/hash_low_32.S')
-rw-r--r--arch/powerpc/mm/hash_low_32.S122
1 files changed, 88 insertions, 34 deletions
diff --git a/arch/powerpc/mm/hash_low_32.S b/arch/powerpc/mm/hash_low_32.S
index b9ba7d93080..7bffb70b9fe 100644
--- a/arch/powerpc/mm/hash_low_32.S
+++ b/arch/powerpc/mm/hash_low_32.S
@@ -75,7 +75,7 @@ _GLOBAL(hash_page_sync)
* Returns to the caller if the access is illegal or there is no
* mapping for the address. Otherwise it places an appropriate PTE
* in the hash table and returns from the exception.
- * Uses r0, r3 - r8, ctr, lr.
+ * Uses r0, r3 - r8, r10, ctr, lr.
*/
.text
_GLOBAL(hash_page)
@@ -106,9 +106,15 @@ _GLOBAL(hash_page)
addi r5,r5,swapper_pg_dir@l /* kernel page table */
rlwimi r3,r9,32-12,29,29 /* MSR_PR -> _PAGE_USER */
112: add r5,r5,r7 /* convert to phys addr */
+#ifndef CONFIG_PTE_64BIT
rlwimi r5,r4,12,20,29 /* insert top 10 bits of address */
lwz r8,0(r5) /* get pmd entry */
rlwinm. r8,r8,0,0,19 /* extract address of pte page */
+#else
+ rlwinm r8,r4,13,19,29 /* Compute pgdir/pmd offset */
+ lwzx r8,r8,r5 /* Get L1 entry */
+ rlwinm. r8,r8,0,0,20 /* extract pt base address */
+#endif
#ifdef CONFIG_SMP
beq- hash_page_out /* return if no mapping */
#else
@@ -118,7 +124,11 @@ _GLOBAL(hash_page)
to the address following the rfi. */
beqlr-
#endif
+#ifndef CONFIG_PTE_64BIT
rlwimi r8,r4,22,20,29 /* insert next 10 bits of address */
+#else
+ rlwimi r8,r4,23,20,28 /* compute pte address */
+#endif
rlwinm r0,r3,32-3,24,24 /* _PAGE_RW access -> _PAGE_DIRTY */
ori r0,r0,_PAGE_ACCESSED|_PAGE_HASHPTE
@@ -127,9 +137,15 @@ _GLOBAL(hash_page)
* because almost always, there won't be a permission violation
* and there won't already be an HPTE, and thus we will have
* to update the PTE to set _PAGE_HASHPTE. -- paulus.
+ *
+ * If PTE_64BIT is set, the low word is the flags word; use that
+ * word for locking since it contains all the interesting bits.
*/
+#if (PTE_FLAGS_OFFSET != 0)
+ addi r8,r8,PTE_FLAGS_OFFSET
+#endif
retry:
- lwarx r6,0,r8 /* get linux-style pte */
+ lwarx r6,0,r8 /* get linux-style pte, flag word */
andc. r5,r3,r6 /* check access & ~permission */
#ifdef CONFIG_SMP
bne- hash_page_out /* return if access not permitted */
@@ -137,6 +153,15 @@ retry:
bnelr-
#endif
or r5,r0,r6 /* set accessed/dirty bits */
+#ifdef CONFIG_PTE_64BIT
+#ifdef CONFIG_SMP
+ subf r10,r6,r8 /* create false data dependency */
+ subi r10,r10,PTE_FLAGS_OFFSET
+ lwzx r10,r6,r10 /* Get upper PTE word */
+#else
+ lwz r10,-PTE_FLAGS_OFFSET(r8)
+#endif /* CONFIG_SMP */
+#endif /* CONFIG_PTE_64BIT */
stwcx. r5,0,r8 /* attempt to update PTE */
bne- retry /* retry if someone got there first */
@@ -203,9 +228,9 @@ _GLOBAL(add_hash_page)
* we can't take a hash table miss (assuming the code is
* covered by a BAT). -- paulus
*/
- mfmsr r10
+ mfmsr r9
SYNC
- rlwinm r0,r10,0,17,15 /* clear bit 16 (MSR_EE) */
+ rlwinm r0,r9,0,17,15 /* clear bit 16 (MSR_EE) */
rlwinm r0,r0,0,28,26 /* clear MSR_DR */
mtmsr r0
SYNC_601
@@ -214,14 +239,14 @@ _GLOBAL(add_hash_page)
tophys(r7,0)
#ifdef CONFIG_SMP
- addis r9,r7,mmu_hash_lock@ha
- addi r9,r9,mmu_hash_lock@l
-10: lwarx r0,0,r9 /* take the mmu_hash_lock */
+ addis r6,r7,mmu_hash_lock@ha
+ addi r6,r6,mmu_hash_lock@l
+10: lwarx r0,0,r6 /* take the mmu_hash_lock */
cmpi 0,r0,0
bne- 11f
- stwcx. r8,0,r9
+ stwcx. r8,0,r6
beq+ 12f
-11: lwz r0,0(r9)
+11: lwz r0,0(r6)
cmpi 0,r0,0
beq 10b
b 11b
@@ -234,10 +259,24 @@ _GLOBAL(add_hash_page)
* HPTE, so we just unlock and return.
*/
mr r8,r5
+#ifndef CONFIG_PTE_64BIT
rlwimi r8,r4,22,20,29
+#else
+ rlwimi r8,r4,23,20,28
+ addi r8,r8,PTE_FLAGS_OFFSET
+#endif
1: lwarx r6,0,r8
andi. r0,r6,_PAGE_HASHPTE
bne 9f /* if HASHPTE already set, done */
+#ifdef CONFIG_PTE_64BIT
+#ifdef CONFIG_SMP
+ subf r10,r6,r8 /* create false data dependency */
+ subi r10,r10,PTE_FLAGS_OFFSET
+ lwzx r10,r6,r10 /* Get upper PTE word */
+#else
+ lwz r10,-PTE_FLAGS_OFFSET(r8)
+#endif /* CONFIG_SMP */
+#endif /* CONFIG_PTE_64BIT */
ori r5,r6,_PAGE_HASHPTE
stwcx. r5,0,r8
bne- 1b
@@ -246,13 +285,15 @@ _GLOBAL(add_hash_page)
9:
#ifdef CONFIG_SMP
+ addis r6,r7,mmu_hash_lock@ha
+ addi r6,r6,mmu_hash_lock@l
eieio
li r0,0
- stw r0,0(r9) /* clear mmu_hash_lock */
+ stw r0,0(r6) /* clear mmu_hash_lock */
#endif
/* reenable interrupts and DR */
- mtmsr r10
+ mtmsr r9
SYNC_601
isync
@@ -267,7 +308,8 @@ _GLOBAL(add_hash_page)
* r5 contains the linux PTE, r6 contains the old value of the
* linux PTE (before setting _PAGE_HASHPTE) and r7 contains the
* offset to be added to addresses (0 if the MMU is on,
- * -KERNELBASE if it is off).
+ * -KERNELBASE if it is off). r10 contains the upper half of
+ * the PTE if CONFIG_PTE_64BIT.
* On SMP, the caller should have the mmu_hash_lock held.
* We assume that the caller has (or will) set the _PAGE_HASHPTE
* bit in the linux PTE in memory. The value passed in r6 should
@@ -285,7 +327,7 @@ Hash_bits = 12 /* e.g. 256kB hash table */
Hash_msk = (((1 << Hash_bits) - 1) * 64)
/* defines for the PTE format for 32-bit PPCs */
-#define PTE_SIZE 8
+#define HPTE_SIZE 8
#define PTEG_SIZE 64
#define LG_PTEG_SIZE 6
#define LDPTEu lwzu
@@ -313,6 +355,11 @@ _GLOBAL(create_hpte)
BEGIN_FTR_SECTION
ori r8,r8,_PAGE_COHERENT /* set M (coherence required) */
END_FTR_SECTION_IFSET(CPU_FTR_NEED_COHERENT)
+#ifdef CONFIG_PTE_64BIT
+ /* Put the XPN bits into the PTE */
+ rlwimi r8,r10,8,20,22
+ rlwimi r8,r10,2,29,29
+#endif
/* Construct the high word of the PPC-style PTE (r5) */
rlwinm r5,r3,7,1,24 /* put VSID in 0x7fffff80 bits */
@@ -342,8 +389,8 @@ _GLOBAL(hash_page_patch_A)
/* Search the primary PTEG for a PTE whose 1st (d)word matches r5 */
mtctr r0
- addi r4,r3,-PTE_SIZE
-1: LDPTEu r6,PTE_SIZE(r4) /* get next PTE */
+ addi r4,r3,-HPTE_SIZE
+1: LDPTEu r6,HPTE_SIZE(r4) /* get next PTE */
CMPPTE 0,r6,r5
bdnzf 2,1b /* loop while ctr != 0 && !cr0.eq */
beq+ found_slot
@@ -353,9 +400,9 @@ _GLOBAL(hash_page_patch_A)
_GLOBAL(hash_page_patch_B)
xoris r4,r3,Hash_msk>>16 /* compute secondary hash */
xori r4,r4,(-PTEG_SIZE & 0xffff)
- addi r4,r4,-PTE_SIZE
+ addi r4,r4,-HPTE_SIZE
mtctr r0
-2: LDPTEu r6,PTE_SIZE(r4)
+2: LDPTEu r6,HPTE_SIZE(r4)
CMPPTE 0,r6,r5
bdnzf 2,2b
beq+ found_slot
@@ -363,8 +410,8 @@ _GLOBAL(hash_page_patch_B)
/* Search the primary PTEG for an empty slot */
10: mtctr r0
- addi r4,r3,-PTE_SIZE /* search primary PTEG */
-1: LDPTEu r6,PTE_SIZE(r4) /* get next PTE */
+ addi r4,r3,-HPTE_SIZE /* search primary PTEG */
+1: LDPTEu r6,HPTE_SIZE(r4) /* get next PTE */
TST_V(r6) /* test valid bit */
bdnzf 2,1b /* loop while ctr != 0 && !cr0.eq */
beq+ found_empty
@@ -380,9 +427,9 @@ _GLOBAL(hash_page_patch_B)
_GLOBAL(hash_page_patch_C)
xoris r4,r3,Hash_msk>>16 /* compute secondary hash */
xori r4,r4,(-PTEG_SIZE & 0xffff)
- addi r4,r4,-PTE_SIZE
+ addi r4,r4,-HPTE_SIZE
mtctr r0
-2: LDPTEu r6,PTE_SIZE(r4)
+2: LDPTEu r6,HPTE_SIZE(r4)
TST_V(r6)
bdnzf 2,2b
beq+ found_empty
@@ -409,11 +456,11 @@ _GLOBAL(hash_page_patch_C)
1: addis r4,r7,next_slot@ha /* get next evict slot */
lwz r6,next_slot@l(r4)
- addi r6,r6,PTE_SIZE /* search for candidate */
- andi. r6,r6,7*PTE_SIZE
+ addi r6,r6,HPTE_SIZE /* search for candidate */
+ andi. r6,r6,7*HPTE_SIZE
stw r6,next_slot@l(r4)
add r4,r3,r6
- LDPTE r0,PTE_SIZE/2(r4) /* get PTE second word */
+ LDPTE r0,HPTE_SIZE/2(r4) /* get PTE second word */
clrrwi r0,r0,12
lis r6,etext@h
ori r6,r6,etext@l /* get etext */
@@ -426,7 +473,7 @@ _GLOBAL(hash_page_patch_C)
found_empty:
STPTE r5,0(r4)
found_slot:
- STPTE r8,PTE_SIZE/2(r4)
+ STPTE r8,HPTE_SIZE/2(r4)
#else /* CONFIG_SMP */
/*
@@ -452,7 +499,7 @@ found_slot:
STPTE r5,0(r4)
sync
TLBSYNC
- STPTE r8,PTE_SIZE/2(r4) /* put in correct RPN, WIMG, PP bits */
+ STPTE r8,HPTE_SIZE/2(r4) /* put in correct RPN, WIMG, PP bits */
sync
SET_V(r5)
STPTE r5,0(r4) /* finally set V bit in PTE */
@@ -499,14 +546,18 @@ _GLOBAL(flush_hash_pages)
isync
/* First find a PTE in the range that has _PAGE_HASHPTE set */
+#ifndef CONFIG_PTE_64BIT
rlwimi r5,r4,22,20,29
-1: lwz r0,0(r5)
+#else
+ rlwimi r5,r4,23,20,28
+#endif
+1: lwz r0,PTE_FLAGS_OFFSET(r5)
cmpwi cr1,r6,1
andi. r0,r0,_PAGE_HASHPTE
bne 2f
ble cr1,19f
addi r4,r4,0x1000
- addi r5,r5,4
+ addi r5,r5,PTE_SIZE
addi r6,r6,-1
b 1b
@@ -545,7 +596,10 @@ _GLOBAL(flush_hash_pages)
* already clear, we're done (for this pte). If not,
* clear it (atomically) and proceed. -- paulus.
*/
-33: lwarx r8,0,r5 /* fetch the pte */
+#if (PTE_FLAGS_OFFSET != 0)
+ addi r5,r5,PTE_FLAGS_OFFSET
+#endif
+33: lwarx r8,0,r5 /* fetch the pte flags word */
andi. r0,r8,_PAGE_HASHPTE
beq 8f /* done if HASHPTE is already clear */
rlwinm r8,r8,0,31,29 /* clear HASHPTE bit */
@@ -562,8 +616,8 @@ _GLOBAL(flush_hash_patch_A)
/* Search the primary PTEG for a PTE whose 1st (d)word matches r5 */
li r0,8 /* PTEs/group */
mtctr r0
- addi r12,r8,-PTE_SIZE
-1: LDPTEu r0,PTE_SIZE(r12) /* get next PTE */
+ addi r12,r8,-HPTE_SIZE
+1: LDPTEu r0,HPTE_SIZE(r12) /* get next PTE */
CMPPTE 0,r0,r11
bdnzf 2,1b /* loop while ctr != 0 && !cr0.eq */
beq+ 3f
@@ -574,9 +628,9 @@ _GLOBAL(flush_hash_patch_A)
_GLOBAL(flush_hash_patch_B)
xoris r12,r8,Hash_msk>>16 /* compute secondary hash */
xori r12,r12,(-PTEG_SIZE & 0xffff)
- addi r12,r12,-PTE_SIZE
+ addi r12,r12,-HPTE_SIZE
mtctr r0
-2: LDPTEu r0,PTE_SIZE(r12)
+2: LDPTEu r0,HPTE_SIZE(r12)
CMPPTE 0,r0,r11
bdnzf 2,2b
xori r11,r11,PTE_H /* clear H again */
@@ -590,7 +644,7 @@ _GLOBAL(flush_hash_patch_B)
8: ble cr1,9f /* if all ptes checked */
81: addi r6,r6,-1
- addi r5,r5,4 /* advance to next pte */
+ addi r5,r5,PTE_SIZE
addi r4,r4,0x1000
lwz r0,0(r5) /* check next pte */
cmpwi cr1,r6,1
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-02 17:56:56 +0000