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authorPaul Mackerras <paulus@samba.org>2007-10-11 20:37:10 +1000
committerPaul Mackerras <paulus@samba.org>2007-10-12 14:05:17 +1000
commit1189be6508d45183013ddb82b18f4934193de274 (patch)
tree58924481b4de56699e4a884dce8dc601e71cf7d1 /arch/powerpc/mm/hash_low_64.S
parent287e5d6fcccfa38b953cebe307e1ddfd32363355 (diff)
downloadlinux-bcache-1189be6508d45183013ddb82b18f4934193de274.tar.zst
[POWERPC] Use 1TB segments
This makes the kernel use 1TB segments for all kernel mappings and for user addresses of 1TB and above, on machines which support them (currently POWER5+, POWER6 and PA6T). We detect that the machine supports 1TB segments by looking at the ibm,processor-segment-sizes property in the device tree. We don't currently use 1TB segments for user addresses < 1T, since that would effectively prevent 32-bit processes from using huge pages unless we also had a way to revert to using 256MB segments. That would be possible but would involve extra complications (such as keeping track of which segment size was used when HPTEs were inserted) and is not addressed here. Parts of this patch were originally written by Ben Herrenschmidt. Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/mm/hash_low_64.S')
-rw-r--r--arch/powerpc/mm/hash_low_64.S73
1 files changed, 65 insertions, 8 deletions
diff --git a/arch/powerpc/mm/hash_low_64.S b/arch/powerpc/mm/hash_low_64.S
index 35eabfb50723..ad253b959030 100644
--- a/arch/powerpc/mm/hash_low_64.S
+++ b/arch/powerpc/mm/hash_low_64.S
@@ -54,7 +54,7 @@
/*
* _hash_page_4K(unsigned long ea, unsigned long access, unsigned long vsid,
- * pte_t *ptep, unsigned long trap, int local)
+ * pte_t *ptep, unsigned long trap, int local, int ssize)
*
* Adds a 4K page to the hash table in a segment of 4K pages only
*/
@@ -66,6 +66,7 @@ _GLOBAL(__hash_page_4K)
/* Save all params that we need after a function call */
std r6,STK_PARM(r6)(r1)
std r8,STK_PARM(r8)(r1)
+ std r9,STK_PARM(r9)(r1)
/* Add _PAGE_PRESENT to access */
ori r4,r4,_PAGE_PRESENT
@@ -117,6 +118,10 @@ _GLOBAL(__hash_page_4K)
* r4 (access) is re-useable, we use it for the new HPTE flags
*/
+BEGIN_FTR_SECTION
+ cmpdi r9,0 /* check segment size */
+ bne 3f
+END_FTR_SECTION_IFSET(CPU_FTR_1T_SEGMENT)
/* Calc va and put it in r29 */
rldicr r29,r5,28,63-28
rldicl r3,r3,0,36
@@ -126,9 +131,20 @@ _GLOBAL(__hash_page_4K)
rldicl r5,r5,0,25 /* vsid & 0x0000007fffffffff */
rldicl r0,r3,64-12,48 /* (ea >> 12) & 0xffff */
xor r28,r5,r0
+ b 4f
+
+3: /* Calc VA and hash in r29 and r28 for 1T segment */
+ sldi r29,r5,40 /* vsid << 40 */
+ clrldi r3,r3,24 /* ea & 0xffffffffff */
+ rldic r28,r5,25,25 /* (vsid << 25) & 0x7fffffffff */
+ clrldi r5,r5,40 /* vsid & 0xffffff */
+ rldicl r0,r3,64-12,36 /* (ea >> 12) & 0xfffffff */
+ xor r28,r28,r5
+ or r29,r3,r29 /* VA */
+ xor r28,r28,r0 /* hash */
/* Convert linux PTE bits into HW equivalents */
- andi. r3,r30,0x1fe /* Get basic set of flags */
+4: andi. r3,r30,0x1fe /* Get basic set of flags */
xori r3,r3,HPTE_R_N /* _PAGE_EXEC -> NOEXEC */
rlwinm r0,r30,32-9+1,30,30 /* _PAGE_RW -> _PAGE_USER (r0) */
rlwinm r4,r30,32-7+1,30,30 /* _PAGE_DIRTY -> _PAGE_USER (r4) */
@@ -183,6 +199,7 @@ htab_insert_pte:
mr r4,r29 /* Retreive va */
li r7,0 /* !bolted, !secondary */
li r8,MMU_PAGE_4K /* page size */
+ ld r9,STK_PARM(r9)(r1) /* segment size */
_GLOBAL(htab_call_hpte_insert1)
bl . /* Patched by htab_finish_init() */
cmpdi 0,r3,0
@@ -205,6 +222,7 @@ _GLOBAL(htab_call_hpte_insert1)
mr r4,r29 /* Retreive va */
li r7,HPTE_V_SECONDARY /* !bolted, secondary */
li r8,MMU_PAGE_4K /* page size */
+ ld r9,STK_PARM(r9)(r1) /* segment size */
_GLOBAL(htab_call_hpte_insert2)
bl . /* Patched by htab_finish_init() */
cmpdi 0,r3,0
@@ -273,7 +291,8 @@ htab_modify_pte:
/* Call ppc_md.hpte_updatepp */
mr r5,r29 /* va */
li r6,MMU_PAGE_4K /* page size */
- ld r7,STK_PARM(r8)(r1) /* get "local" param */
+ ld r7,STK_PARM(r9)(r1) /* segment size */
+ ld r8,STK_PARM(r8)(r1) /* get "local" param */
_GLOBAL(htab_call_hpte_updatepp)
bl . /* Patched by htab_finish_init() */
@@ -325,6 +344,7 @@ _GLOBAL(__hash_page_4K)
/* Save all params that we need after a function call */
std r6,STK_PARM(r6)(r1)
std r8,STK_PARM(r8)(r1)
+ std r9,STK_PARM(r9)(r1)
/* Add _PAGE_PRESENT to access */
ori r4,r4,_PAGE_PRESENT
@@ -383,18 +403,33 @@ _GLOBAL(__hash_page_4K)
/* Load the hidx index */
rldicl r25,r3,64-12,60
+BEGIN_FTR_SECTION
+ cmpdi r9,0 /* check segment size */
+ bne 3f
+END_FTR_SECTION_IFSET(CPU_FTR_1T_SEGMENT)
/* Calc va and put it in r29 */
rldicr r29,r5,28,63-28 /* r29 = (vsid << 28) */
rldicl r3,r3,0,36 /* r3 = (ea & 0x0fffffff) */
- or r29,r3,r29 /* r29 = va
+ or r29,r3,r29 /* r29 = va */
/* Calculate hash value for primary slot and store it in r28 */
rldicl r5,r5,0,25 /* vsid & 0x0000007fffffffff */
rldicl r0,r3,64-12,48 /* (ea >> 12) & 0xffff */
xor r28,r5,r0
+ b 4f
+
+3: /* Calc VA and hash in r29 and r28 for 1T segment */
+ sldi r29,r5,40 /* vsid << 40 */
+ clrldi r3,r3,24 /* ea & 0xffffffffff */
+ rldic r28,r5,25,25 /* (vsid << 25) & 0x7fffffffff */
+ clrldi r5,r5,40 /* vsid & 0xffffff */
+ rldicl r0,r3,64-12,36 /* (ea >> 12) & 0xfffffff */
+ xor r28,r28,r5
+ or r29,r3,r29 /* VA */
+ xor r28,r28,r0 /* hash */
/* Convert linux PTE bits into HW equivalents */
- andi. r3,r30,0x1fe /* Get basic set of flags */
+4: andi. r3,r30,0x1fe /* Get basic set of flags */
xori r3,r3,HPTE_R_N /* _PAGE_EXEC -> NOEXEC */
rlwinm r0,r30,32-9+1,30,30 /* _PAGE_RW -> _PAGE_USER (r0) */
rlwinm r4,r30,32-7+1,30,30 /* _PAGE_DIRTY -> _PAGE_USER (r4) */
@@ -462,6 +497,7 @@ htab_special_pfn:
mr r4,r29 /* Retreive va */
li r7,0 /* !bolted, !secondary */
li r8,MMU_PAGE_4K /* page size */
+ ld r9,STK_PARM(r9)(r1) /* segment size */
_GLOBAL(htab_call_hpte_insert1)
bl . /* patched by htab_finish_init() */
cmpdi 0,r3,0
@@ -488,6 +524,7 @@ _GLOBAL(htab_call_hpte_insert1)
mr r4,r29 /* Retreive va */
li r7,HPTE_V_SECONDARY /* !bolted, secondary */
li r8,MMU_PAGE_4K /* page size */
+ ld r9,STK_PARM(r9)(r1) /* segment size */
_GLOBAL(htab_call_hpte_insert2)
bl . /* patched by htab_finish_init() */
cmpdi 0,r3,0
@@ -586,7 +623,8 @@ htab_modify_pte:
/* Call ppc_md.hpte_updatepp */
mr r5,r29 /* va */
li r6,MMU_PAGE_4K /* page size */
- ld r7,STK_PARM(r8)(r1) /* get "local" param */
+ ld r7,STK_PARM(r9)(r1) /* segment size */
+ ld r8,STK_PARM(r8)(r1) /* get "local" param */
_GLOBAL(htab_call_hpte_updatepp)
bl . /* patched by htab_finish_init() */
@@ -634,6 +672,7 @@ _GLOBAL(__hash_page_64K)
/* Save all params that we need after a function call */
std r6,STK_PARM(r6)(r1)
std r8,STK_PARM(r8)(r1)
+ std r9,STK_PARM(r9)(r1)
/* Add _PAGE_PRESENT to access */
ori r4,r4,_PAGE_PRESENT
@@ -690,6 +729,10 @@ END_FTR_SECTION_IFCLR(CPU_FTR_CI_LARGE_PAGE)
* r4 (access) is re-useable, we use it for the new HPTE flags
*/
+BEGIN_FTR_SECTION
+ cmpdi r9,0 /* check segment size */
+ bne 3f
+END_FTR_SECTION_IFSET(CPU_FTR_1T_SEGMENT)
/* Calc va and put it in r29 */
rldicr r29,r5,28,63-28
rldicl r3,r3,0,36
@@ -699,9 +742,20 @@ END_FTR_SECTION_IFCLR(CPU_FTR_CI_LARGE_PAGE)
rldicl r5,r5,0,25 /* vsid & 0x0000007fffffffff */
rldicl r0,r3,64-16,52 /* (ea >> 16) & 0xfff */
xor r28,r5,r0
+ b 4f
+
+3: /* Calc VA and hash in r29 and r28 for 1T segment */
+ sldi r29,r5,40 /* vsid << 40 */
+ clrldi r3,r3,24 /* ea & 0xffffffffff */
+ rldic r28,r5,25,25 /* (vsid << 25) & 0x7fffffffff */
+ clrldi r5,r5,40 /* vsid & 0xffffff */
+ rldicl r0,r3,64-16,40 /* (ea >> 16) & 0xffffff */
+ xor r28,r28,r5
+ or r29,r3,r29 /* VA */
+ xor r28,r28,r0 /* hash */
/* Convert linux PTE bits into HW equivalents */
- andi. r3,r30,0x1fe /* Get basic set of flags */
+4: andi. r3,r30,0x1fe /* Get basic set of flags */
xori r3,r3,HPTE_R_N /* _PAGE_EXEC -> NOEXEC */
rlwinm r0,r30,32-9+1,30,30 /* _PAGE_RW -> _PAGE_USER (r0) */
rlwinm r4,r30,32-7+1,30,30 /* _PAGE_DIRTY -> _PAGE_USER (r4) */
@@ -756,6 +810,7 @@ ht64_insert_pte:
mr r4,r29 /* Retreive va */
li r7,0 /* !bolted, !secondary */
li r8,MMU_PAGE_64K
+ ld r9,STK_PARM(r9)(r1) /* segment size */
_GLOBAL(ht64_call_hpte_insert1)
bl . /* patched by htab_finish_init() */
cmpdi 0,r3,0
@@ -778,6 +833,7 @@ _GLOBAL(ht64_call_hpte_insert1)
mr r4,r29 /* Retreive va */
li r7,HPTE_V_SECONDARY /* !bolted, secondary */
li r8,MMU_PAGE_64K
+ ld r9,STK_PARM(r9)(r1) /* segment size */
_GLOBAL(ht64_call_hpte_insert2)
bl . /* patched by htab_finish_init() */
cmpdi 0,r3,0
@@ -846,7 +902,8 @@ ht64_modify_pte:
/* Call ppc_md.hpte_updatepp */
mr r5,r29 /* va */
li r6,MMU_PAGE_64K
- ld r7,STK_PARM(r8)(r1) /* get "local" param */
+ ld r7,STK_PARM(r9)(r1) /* segment size */
+ ld r8,STK_PARM(r8)(r1) /* get "local" param */
_GLOBAL(ht64_call_hpte_updatepp)
bl . /* patched by htab_finish_init() */