diff options
| author | Kumar Gala <galak@kernel.crashing.org> | 2009-03-19 04:55:41 +0100 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2009-03-24 03:47:32 +0100 |
| commit | 2319f1239592d0de80414ad2338c2bd7384a2a41 (patch) | |
| tree | 805de041dfc84ae9ca767c9767d833977654dbe0 /arch/powerpc/include/asm/mmu.h | |
| parent | powerpc/mm: Used free register to save a few cycles in SW TLB miss handling (diff) | |
| download | linux-2319f1239592d0de80414ad2338c2bd7384a2a41.tar.xz linux-2319f1239592d0de80414ad2338c2bd7384a2a41.zip | |
powerpc/mm: e300c2/c3/c4 TLB errata workaround
Complete workaround for DTLB errata in e300c2/c3/c4 processors.
Due to the bug, the hardware-implemented LRU algorythm always goes to way
1 of the TLB. This fix implements the proposed software workaround in
form of a LRW table for chosing the TLB-way.
Based on patch from David Jander <david@protonic.nl>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/include/asm/mmu.h')
| -rw-r--r-- | arch/powerpc/include/asm/mmu.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/mmu.h b/arch/powerpc/include/asm/mmu.h index dc82dcd06aea..c073de4af849 100644 --- a/arch/powerpc/include/asm/mmu.h +++ b/arch/powerpc/include/asm/mmu.h @@ -46,6 +46,12 @@ */ #define MMU_FTR_LOCK_BCAST_INVAL ASM_CONST(0x00100000) +/* This indicates that the processor doesn't handle way selection + * properly and needs SW to track and update the LRU state. This + * is specific to an errata on e300c2/c3/c4 class parts + */ +#define MMU_FTR_NEED_DTLB_SW_LRU ASM_CONST(0x00200000) + #ifndef __ASSEMBLY__ #include <asm/cputable.h> |