[U-Boot] [PATCH 2/3] x86: Save mtrr support flag in global data

[Bin Meng]

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 at 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