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authorYuri Tikhonov <yur@emcraft.com>2008-02-02 02:47:31 -0500
committerKumar Gala <galak@kernel.crashing.org>2008-03-07 17:56:54 -0500
commit1757f2d12dce775982aaa006bce1cf4f7ce90111 (patch)
tree068d45767a864ad383ece702fbcbcf3cd2e2752e /arch/ppc
parent3e0d65bf6d5b464949b749a8da7977f6b197d301 (diff)
[PPC] 8xx: swap bug-fix
This makes swap routines operate correctly on the ppc_8xx based machines. Recent kernel's size makes swap feature very important on low-memory platfor those are actually non-operable without it. Signed-off-by: Yuri Tikhonov <yur@emcraft.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Diffstat (limited to 'arch/ppc')
-rw-r--r--arch/ppc/kernel/head_8xx.S30
1 files changed, 29 insertions, 1 deletions
diff --git a/arch/ppc/kernel/head_8xx.S b/arch/ppc/kernel/head_8xx.S
index eb8d26f87362..321bda2de2cb 100644
--- a/arch/ppc/kernel/head_8xx.S
+++ b/arch/ppc/kernel/head_8xx.S
@@ -329,8 +329,18 @@ InstructionTLBMiss:
329 mfspr r11, SPRN_MD_TWC /* ....and get the pte address */ 329 mfspr r11, SPRN_MD_TWC /* ....and get the pte address */
330 lwz r10, 0(r11) /* Get the pte */ 330 lwz r10, 0(r11) /* Get the pte */
331 331
332#ifdef CONFIG_SWAP
333 /* do not set the _PAGE_ACCESSED bit of a non-present page */
334 andi. r11, r10, _PAGE_PRESENT
335 beq 4f
336 ori r10, r10, _PAGE_ACCESSED
337 mfspr r11, SPRN_MD_TWC /* get the pte address again */
338 stw r10, 0(r11)
3394:
340#else
332 ori r10, r10, _PAGE_ACCESSED 341 ori r10, r10, _PAGE_ACCESSED
333 stw r10, 0(r11) 342 stw r10, 0(r11)
343#endif
334 344
335 /* The Linux PTE won't go exactly into the MMU TLB. 345 /* The Linux PTE won't go exactly into the MMU TLB.
336 * Software indicator bits 21, 22 and 28 must be clear. 346 * Software indicator bits 21, 22 and 28 must be clear.
@@ -395,8 +405,17 @@ DataStoreTLBMiss:
395 DO_8xx_CPU6(0x3b80, r3) 405 DO_8xx_CPU6(0x3b80, r3)
396 mtspr SPRN_MD_TWC, r11 406 mtspr SPRN_MD_TWC, r11
397 407
398 mfspr r11, SPRN_MD_TWC /* get the pte address again */ 408#ifdef CONFIG_SWAP
409 /* do not set the _PAGE_ACCESSED bit of a non-present page */
410 andi. r11, r10, _PAGE_PRESENT
411 beq 4f
412 ori r10, r10, _PAGE_ACCESSED
4134:
414 /* and update pte in table */
415#else
399 ori r10, r10, _PAGE_ACCESSED 416 ori r10, r10, _PAGE_ACCESSED
417#endif
418 mfspr r11, SPRN_MD_TWC /* get the pte address again */
400 stw r10, 0(r11) 419 stw r10, 0(r11)
401 420
402 /* The Linux PTE won't go exactly into the MMU TLB. 421 /* The Linux PTE won't go exactly into the MMU TLB.
@@ -575,7 +594,16 @@ DataTLBError:
575 594
576 /* Update 'changed', among others. 595 /* Update 'changed', among others.
577 */ 596 */
597#ifdef CONFIG_SWAP
598 ori r10, r10, _PAGE_DIRTY|_PAGE_HWWRITE
599 /* do not set the _PAGE_ACCESSED bit of a non-present page */
600 andi. r11, r10, _PAGE_PRESENT
601 beq 4f
602 ori r10, r10, _PAGE_ACCESSED
6034:
604#else
578 ori r10, r10, _PAGE_DIRTY|_PAGE_ACCESSED|_PAGE_HWWRITE 605 ori r10, r10, _PAGE_DIRTY|_PAGE_ACCESSED|_PAGE_HWWRITE
606#endif
579 mfspr r11, SPRN_MD_TWC /* Get pte address again */ 607 mfspr r11, SPRN_MD_TWC /* Get pte address again */
580 stw r10, 0(r11) /* and update pte in table */ 608 stw r10, 0(r11) /* and update pte in table */
581 609