When all options are activated, there is not enough space for the
DTLBMiss handlers that handles IMMR area and linear RAM pages in the
exception area. So lets move them after .0x2000
Signed-off-by: Christophe Leroy <christophe.le...@c-s.fr>
---
arch/powerpc/kernel/head_8xx.S | 84 +++++++++++++++++++++---------------------
1 file changed, 42 insertions(+), 42 deletions(-)
diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S
index 708fd43..5f122e6 100644
--- a/arch/powerpc/kernel/head_8xx.S
+++ b/arch/powerpc/kernel/head_8xx.S
@@ -381,26 +381,6 @@ InstructionTLBMiss:
EXCEPTION_EPILOG_0
rfi
-/*
- * Bottom part of DataStoreTLBMiss handler for IMMR area
- * not enough space in the DataStoreTLBMiss area
- */
-DTLBMissIMMR:
- mtcr r10
- /* Set 512k byte guarded page and mark it valid */
- li r10, MD_PS512K | MD_GUARDED | MD_SVALID
- MTSPR_CPU6(SPRN_MD_TWC, r10, r11)
- mfspr r10, SPRN_IMMR /* Get current IMMR */
- rlwinm r10, r10, 0, 0xfff80000 /* Get 512 kbytes boundary */
- ori r10, r10, 0xf0 | MD_SPS16K | _PAGE_SHARED | _PAGE_DIRTY | \
- _PAGE_PRESENT | _PAGE_NO_CACHE
- MTSPR_CPU6(SPRN_MD_RPN, r10, r11) /* Update TLB entry */
-
- li r11, RPN_PATTERN
- mtspr SPRN_DAR, r11 /* Tag DAR */
- EXCEPTION_EPILOG_0
- rfi
-
. = 0x1200
DataStoreTLBMiss:
EXCEPTION_PROLOG_0
@@ -419,7 +399,7 @@ DataStoreTLBMiss:
_ENTRY(DTLBMiss_jmp)
beq- DTLBMissIMMR
#endif
- bge- cr7, 4f
+ bge- cr7, DTLBMissLinear
mfspr r11, SPRN_M_TW /* Get level 1 table */
3:
@@ -486,27 +466,6 @@ _ENTRY(DTLBMiss_jmp)
EXCEPTION_EPILOG_0
rfi
-4:
-_ENTRY(DTLBMiss_cmp)
- cmpli cr0, r11, (PAGE_OFFSET + 0x1800000)@h
- lis r11, (swapper_pg_dir-PAGE_OFFSET)@ha
- bge- 3b
-
- mtcr r10
- /* Set 8M byte page and mark it valid */
- li r10, MD_PS8MEG | MD_SVALID
- MTSPR_CPU6(SPRN_MD_TWC, r10, r11)
- mfspr r10, SPRN_MD_EPN
- rlwinm r10, r10, 0, 0x0f800000 /* 8xx supports max 256Mb RAM */
- ori r10, r10, 0xf0 | MD_SPS16K | _PAGE_SHARED | _PAGE_DIRTY | \
- _PAGE_PRESENT
- MTSPR_CPU6(SPRN_MD_RPN, r10, r11) /* Update TLB entry */
-
- li r11, RPN_PATTERN
- mtspr SPRN_DAR, r11 /* Tag DAR */
- EXCEPTION_EPILOG_0
- rfi
-
/* This is an instruction TLB error on the MPC8xx. This could be due
* to many reasons, such as executing guarded memory or illegal instruction
@@ -568,6 +527,47 @@ DARFixed:/* Return from dcbx instruction bug workaround */
. = 0x2000
+/*
+ * Bottom part of DataStoreTLBMiss handlers for IMMR area and linear RAM.
+ * not enough space in the DataStoreTLBMiss area.
+ */
+DTLBMissIMMR:
+ mtcr r10
+ /* Set 512k byte guarded page and mark it valid */
+ li r10, MD_PS512K | MD_GUARDED | MD_SVALID
+ MTSPR_CPU6(SPRN_MD_TWC, r10, r11)
+ mfspr r10, SPRN_IMMR /* Get current IMMR */
+ rlwinm r10, r10, 0, 0xfff80000 /* Get 512 kbytes boundary */
+ ori r10, r10, 0xf0 | MD_SPS16K | _PAGE_SHARED | _PAGE_DIRTY | \
+ _PAGE_PRESENT | _PAGE_NO_CACHE
+ MTSPR_CPU6(SPRN_MD_RPN, r10, r11) /* Update TLB entry */
+
+ li r11, RPN_PATTERN
+ mtspr SPRN_DAR, r11 /* Tag DAR */
+ EXCEPTION_EPILOG_0
+ rfi
+
+DTLBMissLinear:
+_ENTRY(DTLBMiss_cmp)
+ cmpli cr0, r11, (PAGE_OFFSET + 0x1800000)@h
+ lis r11, (swapper_pg_dir-PAGE_OFFSET)@ha
+ bge- 3b
+
+ mtcr r10
+ /* Set 8M byte page and mark it valid */
+ li r10, MD_PS8MEG | MD_SVALID
+ MTSPR_CPU6(SPRN_MD_TWC, r10, r11)
+ mfspr r10, SPRN_MD_EPN
+ rlwinm r10, r10, 0, 0x0f800000 /* 8xx supports max 256Mb RAM */
+ ori r10, r10, 0xf0 | MD_SPS16K | _PAGE_SHARED | _PAGE_DIRTY | \
+ _PAGE_PRESENT
+ MTSPR_CPU6(SPRN_MD_RPN, r10, r11) /* Update TLB entry */
+
+ li r11, RPN_PATTERN
+ mtspr SPRN_DAR, r11 /* Tag DAR */
+ EXCEPTION_EPILOG_0
+ rfi
+
/* This is the procedure to calculate the data EA for buggy dcbx,dcbi
instructions
* by decoding the registers used by the dcbx instruction and adding them.
* DAR is set to the calculated address.
--
2.1.0
