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

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>

1 files changed, 12 insertions, 4 deletions

diff --git a/arch/arm/mm/proc-v6.S b/arch/arm/mm/proc-v6.S
index 9a7e7c096aa9..ee6f15298735 100644
--- a/arch/arm/mm/proc-v6.S
+++ b/arch/arm/mm/proc-v6.S
@@ -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