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powerpc/8xx: Fix user space TLB walk in dcbX fixup 

The newly added fixup for buggy dcbX insn's has
a bug that always trigger a kernel TLB walk so a user space
dcbX insn will cause a Kernel Machine Check if it hits DTLB error.

Signed-off-by: Joakim Tjernlund <Joakim.Tjernlund@transmode.se>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Joakim Tjernlund 2010-01-08 06:46:26 +00:00 committed by Benjamin Herrenschmidt
parent 3e7b484354
commit 061ec9599f
1 changed files with 2 additions and 2 deletions
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4
arch/powerpc/kernel/head_8xx.S
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@ -542,11 +542,11 @@ DARFixed:/* Return from dcbx instruction bug workaround, r10 holds value of DAR
FixupDAR:/* Entry point for dcbx workaround. */
/* fetch instruction from memory. */
mfspr r10, SPRN_SRR0
andis. r11, r10, 0x8000 /* Address >= 0x80000000 */
DO_8xx_CPU6(0x3780, r3)
mtspr SPRN_MD_EPN, r10
mfspr r11, SPRN_M_TWB /* Get level 1 table entry address */
cmplwi cr0, r11, 0x0800
blt- 3f /* Branch if user space */
beq- 3f /* Branch if user space */
lis r11, (swapper_pg_dir-PAGE_OFFSET)@h
ori r11, r11, (swapper_pg_dir-PAGE_OFFSET)@l
rlwimi r11, r10, 32-20, 0xffc /* r11 = r11&~0xffc|(r10>>20)&0xffc */