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-rw-r--r--arch/powerpc/kernel/head_8xx.S123
1 files changed, 43 insertions, 80 deletions
diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S
index d99aac0d69f1..9b53fe139bf6 100644
--- a/arch/powerpc/kernel/head_8xx.S
+++ b/arch/powerpc/kernel/head_8xx.S
@@ -319,36 +319,29 @@ InstructionTLBMiss:
* pin the first 8MB of kernel memory */
andis. r11, r10, 0x8000 /* Address >= 0x80000000 */
#endif
- mfspr r11, SPRN_M_TW /* Get level 1 table base address */
+ mfspr r11, SPRN_M_TW /* Get level 1 table */
#ifdef CONFIG_MODULES
beq 3f
- lis r11, (swapper_pg_dir-PAGE_OFFSET)@h
- ori r11, r11, (swapper_pg_dir-PAGE_OFFSET)@l
+ lis r11, (swapper_pg_dir-PAGE_OFFSET)@ha
3:
#endif
- /* Extract level 1 index */
- rlwinm r10, r10, 32 - ((PAGE_SHIFT - 2) << 1), (PAGE_SHIFT - 2) << 1, 29
- lwzx r11, r10, r11 /* Get the level 1 entry */
- rlwinm. r10, r11,0,0,19 /* Extract page descriptor page address */
- beq 2f /* If zero, don't try to find a pte */
-
- /* We have a pte table, so load the MI_TWC with the attributes
- * for this "segment."
- */
+ /* Insert level 1 index */
+ rlwimi r11, r10, 32 - ((PAGE_SHIFT - 2) << 1), (PAGE_SHIFT - 2) << 1, 29
+ lwz r11, (swapper_pg_dir-PAGE_OFFSET)@l(r11) /* Get the level 1 entry */
+
+ /* Load the MI_TWC with the attributes for this "segment." */
MTSPR_CPU6(SPRN_MI_TWC, r11, r3) /* Set segment attributes */
- mfspr r11, SPRN_SRR0 /* Get effective address of fault */
+ rlwinm r11, r11,0,0,19 /* Extract page descriptor page address */
/* Extract level 2 index */
- rlwinm r11, r11, 32 - (PAGE_SHIFT - 2), 32 - PAGE_SHIFT, 29
+ rlwinm r10, r10, 32 - (PAGE_SHIFT - 2), 32 - PAGE_SHIFT, 29
lwzx r10, r10, r11 /* Get the pte */
#ifdef CONFIG_SWAP
- andi. r11, r10, _PAGE_ACCESSED | _PAGE_PRESENT
- cmpwi cr0, r11, _PAGE_ACCESSED | _PAGE_PRESENT
- li r11, RPN_PATTERN
- bne- cr0, 2f
-#else
- li r11, RPN_PATTERN
+ rlwinm r11, r10, 32-5, _PAGE_PRESENT
+ and r11, r11, r10
+ rlwimi r10, r11, 0, _PAGE_PRESENT
#endif
+ li r11, RPN_PATTERN
/* The Linux PTE won't go exactly into the MMU TLB.
* Software indicator bits 21 and 28 must be clear.
* Software indicator bits 24, 25, 26, and 27 must be
@@ -366,21 +359,6 @@ InstructionTLBMiss:
mfspr r10, SPRN_SPRG_SCRATCH2
EXCEPTION_EPILOG_0
rfi
-2:
- mfspr r10, SPRN_SRR1
- /* clear all error bits as TLB Miss
- * sets a few unconditionally
- */
- rlwinm r10, r10, 0, 0xffff
- mtspr SPRN_SRR1, r10
-
- /* Restore registers */
-#ifdef CONFIG_8xx_CPU6
- mfspr r3, SPRN_DAR
- mtspr SPRN_DAR, r11 /* Tag DAR */
-#endif
- mfspr r10, SPRN_SPRG_SCRATCH2
- b InstructionTLBError1
. = 0x1200
DataStoreTLBMiss:
@@ -395,20 +373,16 @@ DataStoreTLBMiss:
* kernel page tables.
*/
andis. r11, r10, 0x8000
- mfspr r11, SPRN_M_TW /* Get level 1 table base address */
+ mfspr r11, SPRN_M_TW /* Get level 1 table */
beq 3f
- lis r11, (swapper_pg_dir-PAGE_OFFSET)@h
- ori r11, r11, (swapper_pg_dir-PAGE_OFFSET)@l
+ lis r11, (swapper_pg_dir-PAGE_OFFSET)@ha
3:
- /* Extract level 1 index */
- rlwinm r10, r10, 32 - ((PAGE_SHIFT - 2) << 1), (PAGE_SHIFT - 2) << 1, 29
- lwzx r11, r10, r11 /* Get the level 1 entry */
- rlwinm. r10, r11,0,0,19 /* Extract page descriptor page address */
- beq 2f /* If zero, don't try to find a pte */
+ /* Insert level 1 index */
+ rlwimi r11, r10, 32 - ((PAGE_SHIFT - 2) << 1), (PAGE_SHIFT - 2) << 1, 29
+ lwz r11, (swapper_pg_dir-PAGE_OFFSET)@l(r11) /* Get the level 1 entry */
/* We have a pte table, so load fetch the pte from the table.
*/
- mfspr r10, SPRN_MD_EPN /* Get address of fault */
/* Extract level 2 index */
rlwinm r10, r10, 32 - (PAGE_SHIFT - 2), 32 - PAGE_SHIFT, 29
rlwimi r10, r11, 0, 0, 32 - PAGE_SHIFT - 1 /* Add level 2 base */
@@ -441,16 +415,13 @@ DataStoreTLBMiss:
and r11, r11, r10
rlwimi r10, r11, 0, _PAGE_PRESENT
#endif
- /* invert RW */
- xori r10, r10, _PAGE_RW
-
/* The Linux PTE won't go exactly into the MMU TLB.
* Software indicator bits 22 and 28 must be clear.
* Software indicator bits 24, 25, 26, and 27 must be
* set. All other Linux PTE bits control the behavior
* of the MMU.
*/
-2: li r11, RPN_PATTERN
+ li r11, RPN_PATTERN
rlwimi r10, r11, 0, 24, 28 /* Set 24-27, clear 28 */
MTSPR_CPU6(SPRN_MD_RPN, r10, r3) /* Update TLB entry */
@@ -469,10 +440,7 @@ DataStoreTLBMiss:
*/
. = 0x1300
InstructionTLBError:
- EXCEPTION_PROLOG_0
-InstructionTLBError1:
- EXCEPTION_PROLOG_1
- EXCEPTION_PROLOG_2
+ EXCEPTION_PROLOG
mr r4,r12
mr r5,r9
andis. r10,r5,0x4000
@@ -532,30 +500,21 @@ DARFixed:/* Return from dcbx instruction bug workaround */
/* define if you don't want to use self modifying code */
#define NO_SELF_MODIFYING_CODE
FixupDAR:/* Entry point for dcbx workaround. */
-#ifdef CONFIG_8xx_CPU6
- mtspr SPRN_DAR, r3
-#endif
mtspr SPRN_SPRG_SCRATCH2, r10
/* fetch instruction from memory. */
mfspr r10, SPRN_SRR0
andis. r11, r10, 0x8000 /* Address >= 0x80000000 */
- mfspr r11, SPRN_M_TW /* Get level 1 table base address */
- beq- 3f /* Branch if user space */
- lis r11, (swapper_pg_dir-PAGE_OFFSET)@h
- ori r11, r11, (swapper_pg_dir-PAGE_OFFSET)@l
- /* Extract level 1 index */
-3: rlwinm r10, r10, 32 - ((PAGE_SHIFT - 2) << 1), (PAGE_SHIFT - 2) << 1, 29
- lwzx r11, r10, r11 /* Get the level 1 entry */
- rlwinm r10, r11,0,0,19 /* Extract page descriptor page address */
- mfspr r11, SPRN_SRR0 /* Get effective address of fault */
- /* Extract level 2 index */
- rlwinm r11, r11, 32 - (PAGE_SHIFT - 2), 32 - PAGE_SHIFT, 29
- lwzx r11, r10, r11 /* Get the pte */
-#ifdef CONFIG_8xx_CPU6
- mfspr r3, SPRN_DAR
-#endif
+ mfspr r11, SPRN_M_TW /* Get level 1 table */
+ beq 3f
+ lis r11, (swapper_pg_dir-PAGE_OFFSET)@ha
+ /* Insert level 1 index */
+3: rlwimi r11, r10, 32 - ((PAGE_SHIFT - 2) << 1), (PAGE_SHIFT - 2) << 1, 29
+ lwz r11, (swapper_pg_dir-PAGE_OFFSET)@l(r11) /* Get the level 1 entry */
+ rlwinm r11, r11,0,0,19 /* Extract page descriptor page address */
+ /* Insert level 2 index */
+ rlwimi r11, r10, 32 - (PAGE_SHIFT - 2), 32 - PAGE_SHIFT, 29
+ lwz r11, 0(r11) /* Get the pte */
/* concat physical page address(r11) and page offset(r10) */
- mfspr r10, SPRN_SRR0
rlwimi r11, r10, 0, 32 - PAGE_SHIFT, 31
lwz r11,0(r11)
/* Check if it really is a dcbx instruction. */
@@ -705,8 +664,7 @@ start_here:
* init's THREAD like the context switch code does, but this is
* easier......until someone changes init's static structures.
*/
- lis r6, swapper_pg_dir@h
- ori r6, r6, swapper_pg_dir@l
+ lis r6, swapper_pg_dir@ha
tophys(r6,r6)
#ifdef CONFIG_8xx_CPU6
lis r4, cpu6_errata_word@h
@@ -885,23 +843,28 @@ _GLOBAL(set_context)
stw r4, 0x4(r5)
#endif
+ /* Register M_TW will contain base address of level 1 table minus the
+ * lower part of the kernel PGDIR base address, so that all accesses to
+ * level 1 table are done relative to lower part of kernel PGDIR base
+ * address.
+ */
+ li r5, (swapper_pg_dir-PAGE_OFFSET)@l
+ sub r4, r4, r5
+ tophys (r4, r4)
#ifdef CONFIG_8xx_CPU6
lis r6, cpu6_errata_word@h
ori r6, r6, cpu6_errata_word@l
- tophys (r4, r4)
li r7, 0x3f80
stw r7, 12(r6)
lwz r7, 12(r6)
- mtspr SPRN_M_TW, r4 /* Update MMU base address */
+#endif
+ mtspr SPRN_M_TW, r4 /* Update pointeur to level 1 table */
+#ifdef CONFIG_8xx_CPU6
li r7, 0x3380
stw r7, 12(r6)
lwz r7, 12(r6)
- mtspr SPRN_M_CASID, r3 /* Update context */
-#else
- mtspr SPRN_M_CASID,r3 /* Update context */
- tophys (r4, r4)
- mtspr SPRN_M_TW, r4 /* and pgd */
#endif
+ mtspr SPRN_M_CASID, r3 /* Update context */
SYNC
blr