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| author | Joakim Tjernlund <joakim.tjernlund@transmode.se> | 2010-03-02 05:37:09 (GMT) |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2010-04-07 08:00:31 (GMT) |
| commit | fe1691e3f49d41452832f5aee2b952bd201ccab1 (patch) | |
| tree | 632eb38bf3e600fc85beb92e6bd46973db7b8188 | |
| parent | 43b5fefc24157def813154d1867d2960cefff837 (diff) | |
| download | linux-fe1691e3f49d41452832f5aee2b952bd201ccab1.tar.xz | |
powerpc/8xx: Optimze TLB Miss handlers
This removes a couple of insn's from the TLB Miss
handlers whithout changing functionality.
Signed-off-by: Joakim Tjernlund <Joakim.Tjernlund@transmode.se>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
| -rw-r--r-- | arch/powerpc/kernel/head_8xx.S | 11 |
1 files changed, 3 insertions, 8 deletions
diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S index 3ef743f..ecc4a02 100644 --- a/arch/powerpc/kernel/head_8xx.S +++ b/arch/powerpc/kernel/head_8xx.S @@ -343,17 +343,14 @@ InstructionTLBMiss: cmpwi cr0, r11, _PAGE_ACCESSED | _PAGE_PRESENT bne- cr0, 2f - /* Clear PP lsb, 0x400 */ - rlwinm r10, r10, 0, 22, 20 - /* The Linux PTE won't go exactly into the MMU TLB. - * Software indicator bits 22 and 28 must be clear. + * Software indicator bits 21 and 28 must be clear. * Software indicator bits 24, 25, 26, and 27 must be * set. All other Linux PTE bits control the behavior * of the MMU. */ li r11, 0x00f0 - rlwimi r10, r11, 0, 24, 28 /* Set 24-27, clear 28 */ + rlwimi r10, r11, 0, 0x07f8 /* Set 24-27, clear 21-23,28 */ DO_8xx_CPU6(0x2d80, r3) mtspr SPRN_MI_RPN, r10 /* Update TLB entry */ @@ -444,9 +441,7 @@ DataStoreTLBMiss: /* Honour kernel RO, User NA */ /* 0x200 == Extended encoding, bit 22 */ - /* r11 = (r10 & _PAGE_USER) >> 2 */ - rlwinm r11, r10, 32-2, 0x200 - or r10, r11, r10 + rlwimi r10, r10, 32-2, 0x200 /* Copy USER to bit 22, 0x200 */ /* r11 = (r10 & _PAGE_RW) >> 1 */ rlwinm r11, r10, 32-1, 0x200 or r10, r11, r10 |