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-rw-r--r--arch/arm/mm/proc-xscale.S76
1 files changed, 30 insertions, 46 deletions
diff --git a/arch/arm/mm/proc-xscale.S b/arch/arm/mm/proc-xscale.S
index 2dd85273976..0cce37b9393 100644
--- a/arch/arm/mm/proc-xscale.S
+++ b/arch/arm/mm/proc-xscale.S
@@ -23,7 +23,7 @@
#include <linux/linkage.h>
#include <linux/init.h>
#include <asm/assembler.h>
-#include <asm/elf.h>
+#include <asm/hwcap.h>
#include <asm/pgtable.h>
#include <asm/pgtable-hwdef.h>
#include <asm/page.h>
@@ -406,8 +406,6 @@ ENTRY(cpu_xscale_dcache_clean_area)
/* =============================== PageTable ============================== */
-#define PTE_CACHE_WRITE_ALLOCATE 0
-
/*
* cpu_xscale_switch_mm(pgd)
*
@@ -431,56 +429,42 @@ ENTRY(cpu_xscale_switch_mm)
*
* Errata 40: must set memory to write-through for user read-only pages.
*/
+cpu_xscale_mt_table:
+ .long 0x00 @ L_PTE_MT_UNCACHED
+ .long PTE_BUFFERABLE @ L_PTE_MT_BUFFERABLE
+ .long PTE_CACHEABLE @ L_PTE_MT_WRITETHROUGH
+ .long PTE_CACHEABLE | PTE_BUFFERABLE @ L_PTE_MT_WRITEBACK
+ .long PTE_EXT_TEX(1) | PTE_BUFFERABLE @ L_PTE_MT_DEV_SHARED
+ .long 0x00 @ unused
+ .long PTE_EXT_TEX(1) | PTE_CACHEABLE @ L_PTE_MT_MINICACHE
+ .long PTE_EXT_TEX(1) | PTE_CACHEABLE | PTE_BUFFERABLE @ L_PTE_MT_WRITEALLOC
+ .long 0x00 @ unused
+ .long PTE_BUFFERABLE @ L_PTE_MT_DEV_WC
+ .long 0x00 @ unused
+ .long PTE_CACHEABLE | PTE_BUFFERABLE @ L_PTE_MT_DEV_CACHED
+ .long 0x00 @ L_PTE_MT_DEV_NONSHARED
+ .long 0x00 @ unused
+ .long 0x00 @ unused
+ .long 0x00 @ unused
+
.align 5
ENTRY(cpu_xscale_set_pte_ext)
- str r1, [r0], #-2048 @ linux version
-
- bic r2, r1, #0xff0
- orr r2, r2, #PTE_TYPE_EXT @ extended page
-
- eor r3, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_WRITE | L_PTE_DIRTY
-
- tst r3, #L_PTE_USER @ User?
- orrne r2, r2, #PTE_EXT_AP_URO_SRW @ yes -> user r/o, system r/w
-
- tst r3, #L_PTE_WRITE | L_PTE_DIRTY @ Write and Dirty?
- orreq r2, r2, #PTE_EXT_AP_UNO_SRW @ yes -> user n/a, system r/w
- @ combined with user -> user r/w
-
- @
- @ Handle the X bit. We want to set this bit for the minicache
- @ (U = E = B = W = 0, C = 1) or when write allocate is enabled,
- @ and we have a writeable, cacheable region. If we ignore the
- @ U and E bits, we can allow user space to use the minicache as
- @ well.
- @
- @ X = (C & ~W & ~B) | (C & W & B & write_allocate)
- @
- eor ip, r1, #L_PTE_CACHEABLE
- tst ip, #L_PTE_CACHEABLE | L_PTE_WRITE | L_PTE_BUFFERABLE
-#if PTE_CACHE_WRITE_ALLOCATE
- eorne ip, r1, #L_PTE_CACHEABLE | L_PTE_WRITE | L_PTE_BUFFERABLE
- tstne ip, #L_PTE_CACHEABLE | L_PTE_WRITE | L_PTE_BUFFERABLE
-#endif
- orreq r2, r2, #PTE_EXT_TEX(1)
+ xscale_set_pte_ext_prologue
@
- @ Erratum 40: The B bit must be cleared for a user read-only
- @ cacheable page.
- @
- @ B = B & ~(U & C & ~W)
+ @ Erratum 40: must set memory to write-through for user read-only pages
@
- and ip, r1, #L_PTE_USER | L_PTE_WRITE | L_PTE_CACHEABLE
- teq ip, #L_PTE_USER | L_PTE_CACHEABLE
- biceq r2, r2, #PTE_BUFFERABLE
+ and ip, r1, #(L_PTE_MT_MASK | L_PTE_USER | L_PTE_WRITE) & ~(4 << 2)
+ teq ip, #L_PTE_MT_WRITEBACK | L_PTE_USER
- tst r3, #L_PTE_PRESENT | L_PTE_YOUNG @ Present and Young?
- movne r2, #0 @ no -> fault
+ moveq r1, #L_PTE_MT_WRITETHROUGH
+ and r1, r1, #L_PTE_MT_MASK
+ adr ip, cpu_xscale_mt_table
+ ldr ip, [ip, r1]
+ bic r2, r2, #0x0c
+ orr r2, r2, ip
- str r2, [r0] @ hardware version
- mov ip, #0
- mcr p15, 0, r0, c7, c10, 1 @ Clean D cache line
- mcr p15, 0, ip, c7, c10, 4 @ Drain Write (& Fill) Buffer
+ xscale_set_pte_ext_epilogue
mov pc, lr