diff options
| author | Borislav Petkov <borislav.petkov@amd.com> | 2012-08-06 19:00:39 +0200 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2012-08-06 19:18:39 -0700 |
| commit | 057237bb35a605d795fd787868a1088705f26ee5 (patch) | |
| tree | 952a863f6c8ced5ad8e4b28b6c195c4b324e5bad /arch/x86/kernel/cpu | |
| parent | b46882e4c4de4813947fce940fe74af794a1eb72 (diff) | |
x86, cpu: Preset default tlb_flushall_shift on AMD
Run the mprotect.c microbenchmark on all our families >= K8 and preset
the flushall shift variable accordingly.
Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
Link: http://lkml.kernel.org/r/1344272439-29080-5-git-send-email-bp@amd64.org
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'arch/x86/kernel/cpu')
| -rw-r--r-- | arch/x86/kernel/cpu/amd.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c index bcd200839c9..f7e98a2c0d1 100644 --- a/arch/x86/kernel/cpu/amd.c +++ b/arch/x86/kernel/cpu/amd.c @@ -737,6 +737,17 @@ static unsigned int __cpuinit amd_size_cache(struct cpuinfo_x86 *c, } #endif +static void __cpuinit cpu_set_tlb_flushall_shift(struct cpuinfo_x86 *c) +{ + if (!cpu_has_invlpg) + return; + + tlb_flushall_shift = 5; + + if (c->x86 <= 0x11) + tlb_flushall_shift = 4; +} + static void __cpuinit cpu_detect_tlb_amd(struct cpuinfo_x86 *c) { u32 ebx, eax, ecx, edx; @@ -788,6 +799,8 @@ static void __cpuinit cpu_detect_tlb_amd(struct cpuinfo_x86 *c) tlb_lli_2m[ENTRIES] = eax & mask; tlb_lli_4m[ENTRIES] = tlb_lli_2m[ENTRIES] >> 1; + + cpu_set_tlb_flushall_shift(c); } static const struct cpu_dev __cpuinitconst amd_cpu_dev = { |