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x86: Save mtrr support flag in global data 

CPUID (EAX 01H) returns MTRR support flag in EDX bit 12. Probe this
flag in x86_cpu_init_f() and save it in global data.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Bin Meng 2015-01-22 11:29:40 +08:00 committed by Simon Glass
parent 566d1754d3
commit 4949166906
2 changed files with 14 additions and 6 deletions
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7
arch/x86/cpu/cpu.c
View File

@ -223,6 +223,11 @@ static bool has_cpuid(void)
return flag_is_changeable_p(X86_EFLAGS_ID);
}
static bool has_mtrr(void)
{
return cpuid_edx(0x00000001) & (1 << 12) ? true : false;
}
static int build_vendor_name(char *vendor_name)
{
struct cpuid_result result;
@ -318,6 +323,8 @@ int x86_cpu_init_f(void)
gd->arch.x86_model = c.x86_model;
gd->arch.x86_mask = c.x86_mask;
gd->arch.x86_device = cpu.device;
gd->arch.has_mtrr = has_mtrr();
}
return 0;

1
arch/x86/include/asm/global_data.h
View File

@ -64,6 +64,7 @@ struct arch_global_data {
#endif
struct mtrr_request mtrr_req[MAX_MTRR_REQUESTS];
int mtrr_req_count;
int has_mtrr;
};
#endif