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m32r: fix tme_handler to check _PAGE_PRESENT bit

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Fix the tlb-miss handler (tme_handler) to check _PAGE_PRESENT bit
in order to handle file-mapped or swapped-out pages correctly.

This patch is required to fix unexpected page errors for m32r.

Signed-off-by: Hitoshi Yamamoto <hitoshiy@linux-m32r.org>
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Hirokazu Takata 2007-05-10 22:22:26 -07:00 committed by Linus Torvalds
parent 43c09ce792
commit 0d4f646816
1 changed files with 13 additions and 9 deletions
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22
arch/m32r/mm/mmu.S
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@ -163,7 +163,8 @@ ENTRY(tme_handler)
; pte_data = (unsigned long)pte_val(*pte);
ld r2, @r3 ; r2: pte data
or3 r2, r2, #2 ; _PAGE_PRESENT(=2)
and3 r3, r2, #2 ; _PAGE_PRESENT(=2) check
beqz r3, 3f
.fillinsn
5:
@ -264,11 +265,8 @@ ENTRY(tme_handler)
;
and3 r1, r1, #0xeff
ldi r4, #611 ; _KERNPG_TABLE(=611)
beq r1, r4, 4f ; !pmd_bad(*pmd) ?
.fillinsn
3:
ldi r1, #0 ; r1: pte_data = 0
bra 5f
bne r1, r4, 3f ; !pmd_bad(*pmd) ?
.fillinsn
4:
; pte = pte_offset(pmd, address);
@ -282,8 +280,10 @@ ENTRY(tme_handler)
add r4, r3 ; r4: pte
; pte_data = (unsigned long)pte_val(*pte);
ld r1, @r4 ; r1: pte_data
.fillinsn
and3 r3, r1, #2 ; _PAGE_PRESENT(=2) check
beqz r3, 3f
.fillinsn
;; set tlb
; r0: address, r1: pte_data, r2: entry
; r3,r4: (free)
@ -295,8 +295,7 @@ ENTRY(tme_handler)
and3 r4, r4, #(MMU_CONTEXT_ASID_MASK)
or r3, r4
st r3, @r2
or3 r4, r1, #2 ; _PAGE_PRESENT(=2)
st r4, @(4,r2) ; set_tlb_data(entry, pte_data);
st r1, @(4,r2) ; set_tlb_data(entry, pte_data);
ld r4, @sp+
ld r3, @sp+
@ -306,6 +305,11 @@ ENTRY(tme_handler)
ld sp, @sp+
rte
.fillinsn
3:
ldi r1, #2 ; r1: pte_data = 0 | _PAGE_PRESENT(=2)
bra 5b
#else
#error unknown isa configuration
#endif