[RFC v7 18/25] powerpc: Macro the mask used for checking DSI exception

[Ram Pai]

Replace the magic number used to check for DSI exception
with a meaningful value.

Signed-off-by: Ram Pai <linuxram at us.ibm.com>
---
 arch/powerpc/include/asm/reg.h       |    7 ++++++-
 arch/powerpc/kernel/exceptions-64s.S |    2 +-
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/include/asm/reg.h b/arch/powerpc/include/asm/reg.h
index 7e50e47..ee04bc0 100644
--- a/arch/powerpc/include/asm/reg.h
+++ b/arch/powerpc/include/asm/reg.h
@@ -272,16 +272,21 @@
 #define SPRN_DAR	0x013	/* Data Address Register */
 #define SPRN_DBCR	0x136	/* e300 Data Breakpoint Control Reg */
 #define SPRN_DSISR	0x012	/* Data Storage Interrupt Status Register */
+#define   DSISR_BIT32		0x80000000	/* not defined */
 #define   DSISR_NOHPTE		0x40000000	/* no translation found */
+#define   DSISR_PAGEATTR_CONFLT	0x20000000	/* page attribute conflict */
+#define   DSISR_BIT35		0x10000000	/* not defined */
 #define   DSISR_PROTFAULT	0x08000000	/* protection fault */
 #define   DSISR_BADACCESS	0x04000000	/* bad access to CI or G */
 #define   DSISR_ISSTORE		0x02000000	/* access was a store */
 #define   DSISR_DABRMATCH	0x00400000	/* hit data breakpoint */
-#define   DSISR_NOSEGMENT	0x00200000	/* SLB miss */
 #define   DSISR_KEYFAULT	0x00200000	/* Key fault */
+#define   DSISR_BIT43		0x00100000	/* not defined */
 #define   DSISR_UNSUPP_MMU	0x00080000	/* Unsupported MMU config */
 #define   DSISR_SET_RC		0x00040000	/* Failed setting of R/C bits */
 #define   DSISR_PGDIRFAULT      0x00020000      /* Fault on page directory */
+#define   DSISR_PAGE_FAULT_MASK (DSISR_BIT32 | DSISR_PAGEATTR_CONFLT | \
+				DSISR_BADACCESS | DSISR_DABRMATCH | DSISR_BIT43)
 #define SPRN_TBRL	0x10C	/* Time Base Read Lower Register (user, R/O) */
 #define SPRN_TBRU	0x10D	/* Time Base Read Upper Register (user, R/O) */
 #define SPRN_CIR	0x11B	/* Chip Information Register (hyper, R/0) */
diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
index b886795..e154bfe 100644
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -1411,7 +1411,7 @@ USE_TEXT_SECTION()
 	.balign	IFETCH_ALIGN_BYTES
 do_hash_page:
 #ifdef CONFIG_PPC_STD_MMU_64
-	andis.	r0,r4,0xa450		/* weird error? */
+	andis.	r0,r4,DSISR_PAGE_FAULT_MASK at h
 	bne-	handle_page_fault	/* if not, try to insert a HPTE */
 	CURRENT_THREAD_INFO(r11, r1)
 	lwz	r0,TI_PREEMPT(r11)	/* If we're in an "NMI" */
-- 
1.7.1