1 files changed, 22 insertions, 0 deletions
diff --git a/src/arch/x86/memcpy.c b/src/arch/x86/memcpy.c
new file mode 100644
index 0000000000..4915a9eb51
--- /dev/null
+++ b/src/arch/x86/memcpy.c
@@ -0,0 +1,22 @@
+#include <string.h>
+
+void *memcpy(void *dest, const void *src, size_t n)
+{
+	unsigned long d0, d1, d2;
+
+	asm volatile(
+#ifdef __x86_64__
+		"rep ; movsd\n\t"
+		"mov %4,%%rcx\n\t"
+#else
+		"rep ; movsl\n\t"
+		"movl %4,%%ecx\n\t"
+#endif
+		"rep ; movsb\n\t"
+		: "=&c" (d0), "=&D" (d1), "=&S" (d2)
+		: "0" (n >> 2), "g" (n & 3), "1" (dest), "2" (src)
+		: "memory"
+	);
+
+	return dest;
+}