import KernelEx-4.0-RC1

kexcrt/memcpy.c

@@ -0,0 +1,28 @@
+/*
+ * memcpy.c
+ */
+
+#include <string.h>
+
+void *memcpy(void *dst, const void *src, size_t n)
+{
+	const char *p = src;
+	char *q = dst;
+#if defined(__i386__)
+	size_t nl = n >> 2;
+	asm volatile ("cld ; rep ; movsl ; movl %3,%0 ; rep ; movsb":"+c" (nl),
+		      "+S"(p), "+D"(q)
+		      :"r"(n & 3));
+#elif defined(__x86_64__)
+	size_t nq = n >> 3;
+	asm volatile ("cld ; rep ; movsq ; movl %3,%%ecx ; rep ; movsb":"+c"
+		      (nq), "+S"(p), "+D"(q)
+		      :"r"((uint32_t) (n & 7)));
+#else
+	while (n--) {
+		*q++ = *p++;
+	}
+#endif
+
+	return dst;
+}