redonkable/alistair23-linux
redonkable/alistair23-linux
1
0
Fork 0
Code Releases Activity

[ARM] proc-v6: mark page table walks outer-cacheable, shared. Enable NX.

Browse source 
Mark page table walks with outer-cacheable attribute, and enable no-execute
in page tables.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2006-03-27 16:59:07 +01:00 committed by Russell King
parent 4682adcfb0
commit 3747b36eea
1 changed files with 12 additions and 4 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

16
arch/arm/mm/proc-v6.S
View file

@ -21,6 +21,14 @@
#define D_CACHE_LINE_SIZE 32
#define TTB_C (1 << 0)
#define TTB_S (1 << 1)
#define TTB_IMP (1 << 2)
#define TTB_RGN_NC (0 << 3)
#define TTB_RGN_WBWA (1 << 3)
#define TTB_RGN_WT (2 << 3)
#define TTB_RGN_WB (3 << 3)
.macro cpsie, flags
.ifc \flags, f
.long 0xf1080040
@ -115,7 +123,7 @@ ENTRY(cpu_v6_switch_mm)
mov r2, #0
ldr r1, [r1, #MM_CONTEXT_ID] @ get mm->context.id
#ifdef CONFIG_SMP
orr r0, r0, #2 @ set shared pgtable
orr r0, r0, #TTB_RGN_WBWA|TTB_S @ mark PTWs shared, outer cacheable
#endif
mcr p15, 0, r2, c7, c5, 6 @ flush BTAC/BTB
mcr p15, 0, r2, c7, c10, 4 @ drain write buffer
@ -161,8 +169,8 @@ ENTRY(cpu_v6_set_pte)
tst r1, #L_PTE_YOUNG
biceq r2, r2, #PTE_EXT_APX | PTE_EXT_AP_MASK
@ tst r1, #L_PTE_EXEC
@ orreq r2, r2, #PTE_EXT_XN
tst r1, #L_PTE_EXEC
orreq r2, r2, #PTE_EXT_XN
tst r1, #L_PTE_PRESENT
moveq r2, #0
@ -221,7 +229,7 @@ __v6_setup:
mcr p15, 0, r0, c8, c7, 0 @ invalidate I + D TLBs
mcr p15, 0, r0, c2, c0, 2 @ TTB control register
#ifdef CONFIG_SMP
orr r4, r4, #2 @ set shared pgtable
orr r4, r4, #TTB_RGN_WBWA|TTB_S @ mark PTWs shared, outer cacheable
#endif
mcr p15, 0, r4, c2, c0, 1 @ load TTB1
#ifdef CONFIG_VFP