Add faster, architecture dependent memcpy()

Change-Id: I38d15f3f1ec65f0cb7974d2dd4ae6356433bddd8
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-by: Duncan Laurie <dlaurie@google.com>
Reviewed-on: http://review.coreboot.org/736
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
Tested-by: build bot (Jenkins)

1 files changed, 13 insertions, 0 deletions

diff --git a/src/arch/x86/lib/memcpy.c b/src/arch/x86/lib/memcpy.c
new file mode 100644
index 0000000000..de210928a3
--- /dev/null
+++ b/src/arch/x86/lib/memcpy.c
@@ -0,0 +1,13 @@
+#include <string.h>
+
+void *memcpy(void *__restrict __dest,
+	     __const void *__restrict __src, size_t __n)
+{
+	asm("cld\n"
+	    "rep\n"
+	    "movsb"
+	    :	/* no input (?) */
+	    :"S"(__src), "D"(__dest), "c"(__n)
+	);
+	return __dest;
+}