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| author | Yinghai Lu <yhlu.kernel@gmail.com> | 2008-09-04 20:09:10 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-09-05 09:40:54 +0200 |
| commit | 6627d2423067f2c6eedb422a59fba9270a3c5e36 (patch) | |
| tree | 89c5e002b289a337902f5f5a413a18ba81403951 /arch/x86/kernel/cpu/common_64.c | |
| parent | 5122c890ba969e6efeaba9ed45f5936e62d3c6d5 (diff) | |
| download | blackbird-op-linux-6627d2423067f2c6eedb422a59fba9270a3c5e36.tar.gz blackbird-op-linux-6627d2423067f2c6eedb422a59fba9270a3c5e36.zip | |
x86: cpu/common*.c, merge early_identify_cpu()
Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/cpu/common_64.c')
| -rw-r--r-- | arch/x86/kernel/cpu/common_64.c | 19 |
1 files changed, 16 insertions, 3 deletions
diff --git a/arch/x86/kernel/cpu/common_64.c b/arch/x86/kernel/cpu/common_64.c index 75bb7ff99ee3..6475548d64eb 100644 --- a/arch/x86/kernel/cpu/common_64.c +++ b/arch/x86/kernel/cpu/common_64.c @@ -482,15 +482,28 @@ static void __cpuinit get_cpu_cap(struct cpuinfo_x86 *c) #endif } -/* Do some early cpuid on the boot CPU to get some parameter that are - needed before check_bugs. Everything advanced is in identify_cpu - below. */ +/* + * Do minimum CPU detection early. + * Fields really needed: vendor, cpuid_level, family, model, mask, + * cache alignment. + * The others are not touched to avoid unwanted side effects. + * + * WARNING: this function is only called on the BP. Don't add code here + * that is supposed to run on all CPUs. + */ static void __init early_identify_cpu(struct cpuinfo_x86 *c) { +#ifdef CONFIG_X86_64 c->x86_clflush_size = 64; +#else + c->x86_clflush_size = 32; +#endif c->x86_cache_alignment = c->x86_clflush_size; + if (!have_cpuid_p()) + return; + memset(&c->x86_capability, 0, sizeof c->x86_capability); c->extended_cpuid_level = 0; |
