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-rw-r--r--src/arch/x86/memcpy.c22
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 0000000..4915a9e
--- /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;
+}
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