[PATCH 10/10] 8xx: DTLB Miss cleanup
From: Joakim Tjernlund <hidden>
Date: 2009-11-15 17:10:14
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Michael Ellerman, Linus Torvalds
Use symbolic constant for PRESENT and avoid branching. Signed-off-by: Joakim Tjernlund <redacted> --- 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 2e9f9c0..d8bf208 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.
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1.6.4.4