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| author | Joakim Tjernlund <joakim.tjernlund@transmode.se> | 2009-11-20 00:21:11 +0000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2009-12-09 17:10:37 +1100 |
| commit | 990d89c6636c1be300a4f2f914b95200b237d017 (patch) | |
| tree | fc0bf651eb383b3f7fe5b14bff23b81c23b7bc36 /arch/powerpc | |
| parent | 2321f33790a6c5b80322d907a92d5739e7521a13 (diff) | |
| download | linux-990d89c6636c1be300a4f2f914b95200b237d017.tar.gz linux-990d89c6636c1be300a4f2f914b95200b237d017.tar.xz | |
powerpc/8xx: DTLB Miss cleanup
Use symbolic constant for PRESENT and avoid branching.
Signed-off-by: Joakim Tjernlund <Joakim.Tjernlund@transmode.se>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/kernel/head_8xx.S | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S index f2de8e8a825c..678f98cd5e64 100644 --- a/arch/powerpc/kernel/head_8xx.S +++ b/arch/powerpc/kernel/head_8xx.S @@ -438,15 +438,20 @@ DataStoreTLBMiss: * r11 = ((r10 & PRESENT) & ((r10 & ACCESSED) >> 5)); * r10 = (r10 & ~PRESENT) | r11; */ - rlwinm r11, r10, 32-5, 31, 31 + rlwinm r11, r10, 32-5, _PAGE_PRESENT and r11, r11, r10 - rlwimi r10, r11, 0, 31, 31 + rlwimi r10, r11, 0, _PAGE_PRESENT /* Honour kernel RO, User NA */ - andi. r11, r10, _PAGE_USER | _PAGE_RW - bne- cr0, 5f - ori r10,r10, 0x200 /* Extended encoding, bit 22 */ -5: xori r10, r10, _PAGE_RW /* invert RW bit */ + /* 0x200 == Extended encoding, bit 22 */ + /* r11 = (r10 & _PAGE_USER) >> 2 */ + rlwinm r11, r10, 32-2, 0x200 + or r10, r11, r10 + /* r11 = (r10 & _PAGE_RW) >> 1 */ + rlwinm r11, r10, 32-1, 0x200 + or r10, r11, r10 + /* invert RW and 0x200 bits */ + xori r10, r10, _PAGE_RW | 0x200 /* The Linux PTE won't go exactly into the MMU TLB. * Software indicator bits 22 and 28 must be clear. |