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authorVitaly Bordug <vitb@kernel.crashing.org>2008-03-06 05:53:30 -0500
committerKumar Gala <galak@kernel.crashing.org>2008-03-07 09:42:28 -0500
commit76db5bd26f2d79712459bf80ce0e5c0c5c31b769 (patch)
tree0e5723534da93040f901ed94020aef845fff0dfb /arch
parentd7f46190ef1048e48f71c8a7a60c2881c437d08d (diff)
[POWERPC] 8xx: fix swap
This makes swap routines operate correctly on the ppc_8xx based machines. Code has been revalidated on mpc885ads (8M sdram) with recent kernel. Based on patch from Yuri Tikhonov <yur@emcraft.com> to do the same on arch/ppc instance. Recent kernel's size makes swap feature very important on low-memory platforms, those are actually non-operable without it. Signed-off-by: Yuri Tikhonov <yur@emcraft.com> Signed-off-by: Vitaly Bordug <vitb@kernel.crashing.org> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/powerpc/kernel/head_8xx.S30
1 files changed, 29 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S
index f7458396cd7c..3c9452d4308b 100644
--- a/arch/powerpc/kernel/head_8xx.S
+++ b/arch/powerpc/kernel/head_8xx.S
@@ -332,8 +332,18 @@ InstructionTLBMiss:
332 mfspr r11, SPRN_MD_TWC /* ....and get the pte address */ 332 mfspr r11, SPRN_MD_TWC /* ....and get the pte address */
333 lwz r10, 0(r11) /* Get the pte */ 333 lwz r10, 0(r11) /* Get the pte */
334 334
335#ifdef CONFIG_SWAP
336 /* do not set the _PAGE_ACCESSED bit of a non-present page */
337 andi. r11, r10, _PAGE_PRESENT
338 beq 4f
339 ori r10, r10, _PAGE_ACCESSED
340 mfspr r11, SPRN_MD_TWC /* get the pte address again */
341 stw r10, 0(r11)
3424:
343#else
335 ori r10, r10, _PAGE_ACCESSED 344 ori r10, r10, _PAGE_ACCESSED
336 stw r10, 0(r11) 345 stw r10, 0(r11)
346#endif
337 347
338 /* The Linux PTE won't go exactly into the MMU TLB. 348 /* The Linux PTE won't go exactly into the MMU TLB.
339 * Software indicator bits 21, 22 and 28 must be clear. 349 * Software indicator bits 21, 22 and 28 must be clear.
@@ -398,8 +408,17 @@ DataStoreTLBMiss:
398 DO_8xx_CPU6(0x3b80, r3) 408 DO_8xx_CPU6(0x3b80, r3)
399 mtspr SPRN_MD_TWC, r11 409 mtspr SPRN_MD_TWC, r11
400 410
401 mfspr r11, SPRN_MD_TWC /* get the pte address again */ 411#ifdef CONFIG_SWAP
412 /* do not set the _PAGE_ACCESSED bit of a non-present page */
413 andi. r11, r10, _PAGE_PRESENT
414 beq 4f
402 ori r10, r10, _PAGE_ACCESSED 415 ori r10, r10, _PAGE_ACCESSED
4164:
417 /* and update pte in table */
418#else
419 ori r10, r10, _PAGE_ACCESSED
420#endif
421 mfspr r11, SPRN_MD_TWC /* get the pte address again */
403 stw r10, 0(r11) 422 stw r10, 0(r11)
404 423
405 /* The Linux PTE won't go exactly into the MMU TLB. 424 /* The Linux PTE won't go exactly into the MMU TLB.
@@ -507,7 +526,16 @@ DataTLBError:
507 526
508 /* Update 'changed', among others. 527 /* Update 'changed', among others.
509 */ 528 */
529#ifdef CONFIG_SWAP
530 ori r10, r10, _PAGE_DIRTY|_PAGE_HWWRITE
531 /* do not set the _PAGE_ACCESSED bit of a non-present page */
532 andi. r11, r10, _PAGE_PRESENT
533 beq 4f
534 ori r10, r10, _PAGE_ACCESSED
5354:
536#else
510 ori r10, r10, _PAGE_DIRTY|_PAGE_ACCESSED|_PAGE_HWWRITE 537 ori r10, r10, _PAGE_DIRTY|_PAGE_ACCESSED|_PAGE_HWWRITE
538#endif
511 mfspr r11, SPRN_MD_TWC /* Get pte address again */ 539 mfspr r11, SPRN_MD_TWC /* Get pte address again */
512 stw r10, 0(r11) /* and update pte in table */ 540 stw r10, 0(r11) /* and update pte in table */
513 541