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powerpc/8xx: Avoid testing for kernel space in ITLB Miss. 

Only modules will cause ITLB Misses as we always pin
the first 8MB of kernel memory.

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 2010-03-02 05:37:10 +00:00 committed by Benjamin Herrenschmidt
parent fe1691e3f4
commit 4afb0be7cc
1 changed files with 4 additions and 0 deletions
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4
arch/powerpc/kernel/head_8xx.S
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@ -318,12 +318,16 @@ InstructionTLBMiss:
/* If we are faulting a kernel address, we have to use the /* If we are faulting a kernel address, we have to use the
* kernel page tables. * kernel page tables.
*/ */
#ifdef CONFIG_MODULES
/* Only modules will cause ITLB Misses as we always
* pin the first 8MB of kernel memory */
andi. r11, r10, 0x0800 /* Address >= 0x80000000 */ andi. r11, r10, 0x0800 /* Address >= 0x80000000 */
beq 3f beq 3f
lis r11, swapper_pg_dir@h lis r11, swapper_pg_dir@h
ori r11, r11, swapper_pg_dir@l ori r11, r11, swapper_pg_dir@l
rlwimi r10, r11, 0, 2, 19 rlwimi r10, r11, 0, 2, 19
3: 3:
#endif
lwz r11, 0(r10) /* Get the level 1 entry */ lwz r11, 0(r10) /* Get the level 1 entry */
rlwinm. r10, r11,0,0,19 /* Extract page descriptor page address */ rlwinm. r10, r11,0,0,19 /* Extract page descriptor page address */
beq 2f /* If zero, don't try to find a pte */ beq 2f /* If zero, don't try to find a pte */