diff options
| author | Andi Kleen <ak@suse.de> | 2005-09-29 22:05:55 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-09-29 15:41:42 -0700 |
| commit | 7d318d774789657c37a5e994a4a2cf59d4879ae7 (patch) | |
| tree | ac48b3dd2cd7c8bedb049f4062ef9959bc5c73bb /arch/i386 | |
| parent | 5acbc5cb507e6c381b70093b1081854708e82b16 (diff) | |
[PATCH] Fix up TLB flush filter disabling
I checked with AMD and they requested to only disable it for family 15.
Also disable it for i386 too. And some style fixes.
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/i386')
| -rw-r--r-- | arch/i386/kernel/cpu/amd.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/arch/i386/kernel/cpu/amd.c b/arch/i386/kernel/cpu/amd.c index 73aeaf5a9d4..4c1ddf2b57c 100644 --- a/arch/i386/kernel/cpu/amd.c +++ b/arch/i386/kernel/cpu/amd.c @@ -28,6 +28,22 @@ static void __init init_amd(struct cpuinfo_x86 *c) int mbytes = num_physpages >> (20-PAGE_SHIFT); int r; +#ifdef CONFIG_SMP + unsigned long value; + + /* Disable TLB flush filter by setting HWCR.FFDIS on K8 + * bit 6 of msr C001_0015 + * + * Errata 63 for SH-B3 steppings + * Errata 122 for all steppings (F+ have it disabled by default) + */ + if (c->x86 == 15) { + rdmsrl(MSR_K7_HWCR, value); + value |= 1 << 6; + wrmsrl(MSR_K7_HWCR, value); + } +#endif + /* * FIXME: We should handle the K5 here. Set up the write * range and also turn on MSR 83 bits 4 and 31 (write alloc, |