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-rw-r--r--src/cpu/x86/mtrr/earlymtrr.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/src/cpu/x86/mtrr/earlymtrr.c b/src/cpu/x86/mtrr/earlymtrr.c
index e8608fd9cc..f96b05061f 100644
--- a/src/cpu/x86/mtrr/earlymtrr.c
+++ b/src/cpu/x86/mtrr/earlymtrr.c
@@ -4,6 +4,8 @@
#include <cpu/cpu.h>
#include <cpu/x86/mtrr.h>
#include <cpu/x86/msr.h>
+#include <console/console.h>
+#include <commonlib/bsd/helpers.h>
/* Get first available variable MTRR.
* Returns var# if available, else returns -1.
@@ -34,6 +36,15 @@ void set_var_mtrr(
/* Bit 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);