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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2008-07-08 15:54:40 +1000
committerJosh Boyer <jwboyer@linux.vnet.ibm.com>2008-07-09 13:36:17 -0400
commit1bc54c03117b90716e0dedd7abb2a20405de65df (patch)
tree8e82fd610abaff36f1e20b5aaaf7bdeaee883aac /arch/powerpc/kernel/head_booke.h
parentbeae4c03c0fe69cf7d57518aa0572ad21730b8be (diff)
powerpc: rework 4xx PTE access and TLB miss
This is some preliminary work to improve TLB management on SW loaded TLB powerpc platforms. This introduce support for non-atomic PTE operations in pgtable-ppc32.h and removes write back to the PTE from the TLB miss handlers. In addition, the DSI interrupt code no longer tries to fixup write permission, this is left to generic code, and _PAGE_HWWRITE is gone. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
Diffstat (limited to 'arch/powerpc/kernel/head_booke.h')
-rw-r--r--arch/powerpc/kernel/head_booke.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/head_booke.h b/arch/powerpc/kernel/head_booke.h
index b0461be1c92..fce2df98850 100644
--- a/arch/powerpc/kernel/head_booke.h
+++ b/arch/powerpc/kernel/head_booke.h
@@ -340,6 +340,14 @@ label:
addi r3,r1,STACK_FRAME_OVERHEAD; \
EXC_XFER_TEMPLATE(DebugException, 0x2002, (MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)), NOCOPY, crit_transfer_to_handler, ret_from_crit_exc)
+#define DATA_STORAGE_EXCEPTION \
+ START_EXCEPTION(DataStorage) \
+ NORMAL_EXCEPTION_PROLOG; \
+ mfspr r5,SPRN_ESR; /* Grab the ESR and save it */ \
+ stw r5,_ESR(r11); \
+ mfspr r4,SPRN_DEAR; /* Grab the DEAR */ \
+ EXC_XFER_EE_LITE(0x0300, handle_page_fault)
+
#define INSTRUCTION_STORAGE_EXCEPTION \
START_EXCEPTION(InstructionStorage) \
NORMAL_EXCEPTION_PROLOG; \