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...@gmail.com>
---
arch/x86/cpu/cpu.c | 7 +++++++
arch/x86/include/asm/global_data.h | 3 ++-
2 files changed, 9 insertions(+), 1 deletion(-)
diff --git a/arch/x86/cpu/cpu.c b/arch/x86/cpu/cpu.c
index 30e5069..ed7905c 100644
--- a/arch/x86/cpu/cpu.c
+++ b/arch/x86/cpu/cpu.c
@@ -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;
diff --git a/arch/x86/include/asm/global_data.h
b/arch/x86/include/asm/global_data.h
index 24e3052..6499b9e 100644
--- a/arch/x86/include/asm/global_data.h
+++ b/arch/x86/include/asm/global_data.h
@@ -63,7 +63,8 @@ struct arch_global_data {
void *hob_list; /* FSP HOB list */
#endif
struct mtrr_request mtrr_req[MAX_MTRR_REQUESTS];
- int mtrr_req_count;
+ int mtrr_req_count;
+ int has_mtrr;
};
#endif
--
1.8.2.1
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