[POWERPC] Use PAGE_OFFSET to tell if an address is user/kernel in SW TLB handlers

Move to using PAGE_OFFSET instead of TASK_SIZE or KERNELBASE value on
6xx/40x/44x/fsl-booke to determine if the faulting address is a kernel or
user space address.  This mimics how the macro is_kernel_addr() works.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

4 files changed, 19 insertions, 22 deletions

diff --git a/arch/powerpc/kernel/head_32.S b/arch/powerpc/kernel/head_32.S
index d83f04e5a599..a5b13ae7fd20 100644
--- a/arch/powerpc/kernel/head_32.S
+++ b/arch/powerpc/kernel/head_32.S
@@ -469,12 +469,12 @@ InstructionTLBMiss:
         mfctr   r0
         /* Get PTE (linux-style) and check access */
         mfspr   r3,SPRN_IMISS
-        lis     r1,KERNELBASE@h         /* check if kernel address */
-        cmplw   0,r3,r1
+        lis     r1,PAGE_OFFSET@h                /* check if kernel address */
+        cmplw   0,r1,r3
         mfspr   r2,SPRN_SPRG3
         li      r1,_PAGE_USER|_PAGE_PRESENT /* low addresses tested as user */
         lwz     r2,PGDIR(r2)
-        blt+    112f
+        bge-    112f
         mfspr   r2,SPRN_SRR1            /* and MSR_PR bit from SRR1 */
         rlwimi  r1,r2,32-12,29,29       /* shift MSR_PR to _PAGE_USER posn */
         lis     r2,swapper_pg_dir@ha    /* if kernel address, use */
@@ -543,12 +543,12 @@ DataLoadTLBMiss:
         mfctr   r0
         /* Get PTE (linux-style) and check access */
         mfspr   r3,SPRN_DMISS
-        lis     r1,KERNELBASE@h         /* check if kernel address */
-        cmplw   0,r3,r1
+        lis     r1,PAGE_OFFSET@h                /* check if kernel address */
+        cmplw   0,r1,r3
         mfspr   r2,SPRN_SPRG3
         li      r1,_PAGE_USER|_PAGE_PRESENT /* low addresses tested as user */
         lwz     r2,PGDIR(r2)
-        blt+    112f
+        bge-    112f
         mfspr   r2,SPRN_SRR1            /* and MSR_PR bit from SRR1 */
         rlwimi  r1,r2,32-12,29,29       /* shift MSR_PR to _PAGE_USER posn */
         lis     r2,swapper_pg_dir@ha    /* if kernel address, use */
@@ -615,12 +615,12 @@ DataStoreTLBMiss:
         mfctr   r0
         /* Get PTE (linux-style) and check access */
         mfspr   r3,SPRN_DMISS
-        lis     r1,KERNELBASE@h         /* check if kernel address */
-        cmplw   0,r3,r1
+        lis     r1,PAGE_OFFSET@h                /* check if kernel address */
+        cmplw   0,r1,r3
         mfspr   r2,SPRN_SPRG3
         li      r1,_PAGE_RW|_PAGE_USER|_PAGE_PRESENT /* access flags */
         lwz     r2,PGDIR(r2)
-        blt+    112f
+        bge-    112f
         mfspr   r2,SPRN_SRR1            /* and MSR_PR bit from SRR1 */
         rlwimi  r1,r2,32-12,29,29       /* shift MSR_PR to _PAGE_USER posn */
         lis     r2,swapper_pg_dir@ha    /* if kernel address, use */
diff --git a/arch/powerpc/kernel/head_40x.S b/arch/powerpc/kernel/head_40x.S
index e312824bdd98..cfefc2df8f2a 100644
--- a/arch/powerpc/kernel/head_40x.S
+++ b/arch/powerpc/kernel/head_40x.S
@@ -289,7 +289,7 @@ label:
         /* If we are faulting a kernel address, we have to use the
          * kernel page tables.
          */
-        lis     r11, TASK_SIZE@h
+        lis     r11, PAGE_OFFSET@h
         cmplw   r10, r11
         blt+    3f
         lis     r11, swapper_pg_dir@h
@@ -481,7 +481,7 @@ label:
         /* If we are faulting a kernel address, we have to use the
          * kernel page tables.
          */
-        lis     r11, TASK_SIZE@h
+        lis     r11, PAGE_OFFSET@h
         cmplw   r10, r11
         blt+    3f
         lis     r11, swapper_pg_dir@h
@@ -581,7 +581,7 @@ label:
         /* If we are faulting a kernel address, we have to use the
          * kernel page tables.
          */
-        lis     r11, TASK_SIZE@h
+        lis     r11, PAGE_OFFSET@h
         cmplw   r10, r11
         blt+    3f
         lis     r11, swapper_pg_dir@h
diff --git a/arch/powerpc/kernel/head_44x.S b/arch/powerpc/kernel/head_44x.S
index 864d63fbb204..409db6123924 100644
--- a/arch/powerpc/kernel/head_44x.S
+++ b/arch/powerpc/kernel/head_44x.S
@@ -319,7 +319,7 @@ interrupt_base:
         /* If we are faulting a kernel address, we have to use the
          * kernel page tables.
          */
-        lis     r11, TASK_SIZE@h
+        lis     r11, PAGE_OFFSET@h
         cmplw   r10, r11
         blt+    3f
         lis     r11, swapper_pg_dir@h
@@ -458,7 +458,7 @@ interrupt_base:
         /* If we are faulting a kernel address, we have to use the
          * kernel page tables.
          */
-        lis     r11, TASK_SIZE@h
+        lis     r11, PAGE_OFFSET@h
         cmplw   r10, r11
         blt+    3f
         lis     r11, swapper_pg_dir@h
@@ -528,7 +528,7 @@ interrupt_base:
         /* If we are faulting a kernel address, we have to use the
          * kernel page tables.
          */
-        lis     r11, TASK_SIZE@h
+        lis     r11, PAGE_OFFSET@h
         cmplw   r10, r11
         blt+    3f
         lis     r11, swapper_pg_dir@h
diff --git a/arch/powerpc/kernel/head_fsl_booke.S b/arch/powerpc/kernel/head_fsl_booke.S
index ee33ddd97ef3..4b9822728aea 100644
--- a/arch/powerpc/kernel/head_fsl_booke.S
+++ b/arch/powerpc/kernel/head_fsl_booke.S
@@ -461,8 +461,7 @@ interrupt_base:
         /* If we are faulting a kernel address, we have to use the
          * kernel page tables.
          */
-        lis     r11, TASK_SIZE@h
-        ori     r11, r11, TASK_SIZE@l
+        lis     r11, PAGE_OFFSET@h
         cmplw   0, r10, r11
         bge     2f
 
@@ -584,8 +583,7 @@ interrupt_base:
         /* If we are faulting a kernel address, we have to use the
          * kernel page tables.
          */
-        lis     r11, TASK_SIZE@h
-        ori     r11, r11, TASK_SIZE@l
+        lis     r11, PAGE_OFFSET@h
         cmplw   5, r10, r11
         blt     5, 3f
         lis     r11, swapper_pg_dir@h
@@ -645,8 +643,7 @@ interrupt_base:
         /* If we are faulting a kernel address, we have to use the
          * kernel page tables.
          */
-        lis     r11, TASK_SIZE@h
-        ori     r11, r11, TASK_SIZE@l
+        lis     r11, PAGE_OFFSET@h
         cmplw   5, r10, r11
         blt     5, 3f
         lis     r11, swapper_pg_dir@h
@@ -744,7 +741,7 @@ data_access:
  *      r10 - EA of fault
  *      r11 - TLB (info from Linux PTE)
  *      r12, r13 - available to use
- *      CR5 - results of addr < TASK_SIZE
+ *      CR5 - results of addr >= PAGE_OFFSET
  *      MAS0, MAS1 - loaded with proper value when we get here
  *      MAS2, MAS3 - will need additional info from Linux PTE
  *      Upon exit, we reload everything and RFI.