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>

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;

arch/x86/include/asm/global_data.h

@@ -44,11 +44,11 @@ struct mtrr_request {
 
 /* Architecture-specific global data */
 struct arch_global_data {
-	struct global_data *gd_addr;		/* Location of Global Data */
-	uint8_t  x86;			/* CPU family */
-	uint8_t  x86_vendor;		/* CPU vendor */
-	uint8_t  x86_model;
-	uint8_t  x86_mask;
+	struct global_data *gd_addr;	/* Location of Global Data */
+	uint8_t x86;			/* CPU family */
+	uint8_t x86_vendor;		/* CPU vendor */
+	uint8_t x86_model;
+	uint8_t x86_mask;
 	uint32_t x86_device;
 	uint64_t tsc_base;		/* Initial value returned by rdtsc() */
 	uint32_t tsc_base_kclocks;	/* Initial tsc as a kclocks value */
@@ -60,10 +60,11 @@ struct arch_global_data {
 	const struct pch_gpio_map *gpio_map;	/* board GPIO map */
 	struct memory_info meminfo;	/* Memory information */
 #ifdef CONFIG_HAVE_FSP
-	void	*hob_list;		/* FSP HOB list */
+	void *hob_list;			/* FSP HOB list */
 #endif
 	struct mtrr_request mtrr_req[MAX_MTRR_REQUESTS];
 	int mtrr_req_count;
+	int has_mtrr;
 };
 
 #endif