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[POWERPC] Check _PAGE_RW and _PAGE_PRESENT on kernel addresses 

Previously, the TLB miss handlers assumed that pages above KERNELBASE are
always present and read/write.  This assumption is false in the case of
CONFIG_DEBUG_PAGEALLOC.

Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Scott Wood 2007-09-06 08:04:38 +10:00 committed by Paul Mackerras
parent 96ebc3bfb6
commit bde6c6e16a
1 changed files with 6 additions and 6 deletions
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12
arch/powerpc/kernel/head_32.S
View File

@ -475,10 +475,10 @@ InstructionTLBMiss:
li r1,_PAGE_USER|_PAGE_PRESENT /* low addresses tested as user */
lwz r2,PGDIR(r2)
blt+ 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 */
addi r2,r2,swapper_pg_dir@l /* kernel page table */
mfspr r1,SPRN_SRR1 /* and MSR_PR bit from SRR1 */
rlwinm r1,r1,32-12,29,29 /* shift MSR_PR to _PAGE_USER posn */
112: tophys(r2,r2)
rlwimi r2,r3,12,20,29 /* insert top 10 bits of address */
lwz r2,0(r2) /* get pmd entry */
@ -549,10 +549,10 @@ DataLoadTLBMiss:
li r1,_PAGE_USER|_PAGE_PRESENT /* low addresses tested as user */
lwz r2,PGDIR(r2)
blt+ 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 */
addi r2,r2,swapper_pg_dir@l /* kernel page table */
mfspr r1,SPRN_SRR1 /* and MSR_PR bit from SRR1 */
rlwinm r1,r1,32-12,29,29 /* shift MSR_PR to _PAGE_USER posn */
112: tophys(r2,r2)
rlwimi r2,r3,12,20,29 /* insert top 10 bits of address */
lwz r2,0(r2) /* get pmd entry */
@ -621,10 +621,10 @@ DataStoreTLBMiss:
li r1,_PAGE_RW|_PAGE_USER|_PAGE_PRESENT /* access flags */
lwz r2,PGDIR(r2)
blt+ 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 */
addi r2,r2,swapper_pg_dir@l /* kernel page table */
mfspr r1,SPRN_SRR1 /* and MSR_PR bit from SRR1 */
rlwinm r1,r1,32-12,29,29 /* shift MSR_PR to _PAGE_USER posn */
112: tophys(r2,r2)
rlwimi r2,r3,12,20,29 /* insert top 10 bits of address */
lwz r2,0(r2) /* get pmd entry */