1 files changed, 60 insertions, 0 deletions
diff --git a/src/cpu/x86/mtrr/earlymtrr.c b/src/cpu/x86/mtrr/earlymtrr.c
index 8ea121638464..2c14a706093c 100644
--- a/src/cpu/x86/mtrr/earlymtrr.c
+++ b/src/cpu/x86/mtrr/earlymtrr.c
@@ -7,6 +7,66 @@
 #include <commonlib/bsd/helpers.h>
 #include <stdint.h>
 
+/* Get first available variable MTRR.
+ * Returns var# if available, else returns -1.
+ */
+int get_free_var_mtrr(void)
+{
+	msr_t maskm;
+	int vcnt;
+	int i;
+
+	vcnt = get_var_mtrr_count();
+
+	/* Identify the first var mtrr which is not valid. */
+	for (i = 0; i < vcnt; i++) {
+		maskm = rdmsr(MTRR_PHYS_MASK(i));
+		if ((maskm.lo & MTRR_PHYS_MASK_VALID) == 0)
+			return i;
+	}
+
+	/* No free var mtrr. */
+	return -1;
+}
+
+void set_var_mtrr(
+	unsigned int reg, unsigned int base, unsigned int size,
+	unsigned int type)
+{
+	/* Bit 32-35 of MTRRphysMask should be set to 1 */
+	/* FIXME: It only support 4G less range */
+	msr_t basem, maskm;
+
+	if (!IS_POWER_OF_2(size))
+		printk(BIOS_ERR, "MTRR Error: size %#x is not a power of two\n", size);
+	if (size < 4 * KiB)
+		printk(BIOS_ERR, "MTRR Error: size %#x smaller than 4KiB\n", size);
+	if (base % size != 0)
+		printk(BIOS_ERR, "MTRR Error: base %#x must be aligned to size %#x\n", base,
+		       size);
+
+	basem.lo = base | type;
+	basem.hi = 0;
+	wrmsr(MTRR_PHYS_BASE(reg), basem);
+	maskm.lo = ~(size - 1) | MTRR_PHYS_MASK_VALID;
+	maskm.hi = (1 << (cpu_phys_address_size() - 32)) - 1;
+	wrmsr(MTRR_PHYS_MASK(reg), maskm);
+}
+
+void clear_all_var_mtrr(void)
+{
+	msr_t mtrr = {0, 0};
+	int vcnt;
+	int i;
+
+	vcnt = get_var_mtrr_count();
+
+	for (i = 0; i < vcnt; i++) {
+		wrmsr(MTRR_PHYS_MASK(i), mtrr);
+		wrmsr(MTRR_PHYS_BASE(i), mtrr);
+	}
+}
+
 void var_mtrr_context_init(struct var_mtrr_context *ctx)
 {
 	ctx->max_var_mtrrs = get_var_mtrr_count();