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ARM: pgtable: switch order of Linux vs hardware page tables

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This switches the ordering of the Linux vs hardware page tables in
each page, thereby eliminating some of the arithmetic in the page
table walks.  As we now place the Linux page table at the beginning
of the page, we can deal with the offset in the pgt by simply masking
it away, along with the other control bits.

This also makes the arithmetic all be positive, rather than a mixture.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King
2010-11-16 00:16:01 +00:00
parent f6e3354d02
commit d30e45eeab
5 changed files with 42 additions and 50 deletions
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10
arch/arm/mm/proc-macros.S
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@@ -121,7 +121,7 @@
.endm
.macro armv6_set_pte_ext pfx
str r1, [r0], #-2048 @ linux version
str r1, [r0], #2048 @ linux version
bic r3, r1, #0x000003fc
bic r3, r3, #PTE_TYPE_MASK
@@ -170,7 +170,7 @@
* 1111 0xff r/w r/w
*/
.macro armv3_set_pte_ext wc_disable=1
str r1, [r0], #-2048 @ linux version
str r1, [r0], #2048 @ linux version
eor r3, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_WRITE | L_PTE_DIRTY
@@ -193,7 +193,7 @@
bicne r2, r2, #PTE_BUFFERABLE
#endif
.endif
str r2, [r0] @ hardware version
str r2, [r0] @ hardware version
.endm
@@ -213,7 +213,7 @@
* 1111 11 r/w r/w
*/
.macro xscale_set_pte_ext_prologue
str r1, [r0], #-2048 @ linux version
str r1, [r0] @ linux version
eor r3, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_WRITE | L_PTE_DIRTY
@@ -232,7 +232,7 @@
tst r3, #L_PTE_PRESENT | L_PTE_YOUNG @ present and young?
movne r2, #0 @ no -> fault
str r2, [r0] @ hardware version
str r2, [r0, #2048]! @ hardware version
mov ip, #0
mcr p15, 0, r0, c7, c10, 1 @ clean L1 D line
mcr p15, 0, ip, c7, c10, 4 @ data write barrier