match some of fraser/cuyler files.

include/_mem.h

@@ -0,0 +1,19 @@
+#pragma once
+
+#include <stddef.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#pragma section code_type ".init"
+
+void * memcpy(void * dst, const void * src, size_t n);
+void * memset(void * dst, int val, size_t n);
+void __fill_mem(void * dst, int val, unsigned long n);
+
+#pragma section code_type
+
+#ifdef __cplusplus
+}
+#endif