1 files changed, 25 insertions, 0 deletions
diff --git a/src/northbridge/amd/amdk8/cpu_rev.c b/src/northbridge/amd/amdk8/cpu_rev.c
new file mode 100644
index 0000000000..51f235905e
--- /dev/null
+++ b/src/northbridge/amd/amdk8/cpu_rev.c
@@ -0,0 +1,25 @@
+/* this is a shrunken cpuid. */
+
+static unsigned int cpuid(unsigned int op)
+{
+	unsigned int ret;
+	unsigned dummy2,dummy3,dummy4;
+
+	asm volatile ( 
+		"cpuid" 
+		: "=a" (ret), "=b" (dummy2), "=c" (dummy3), "=d" (dummy4)
+		: "a" (op)
+		);
+
+	return ret;
+}
+
+static int is_cpu_rev_a0(void)
+{
+	return (cpuid(1) & 0xffff) == 0x0f10;
+}
+
+static int is_cpu_pre_c0(void)
+{
+	return (cpuid(1) & 0xffef) < 0x0f48;
+}