Add memory copy and move functions. Required by gcc, and we'll also use

them soon

src/kernel/include/memory.h

@@ -21,3 +21,12 @@
 
 #define PAGE_SIZE       0x1000
 #define ENTRIES_PER_PT  512
+
+#ifndef __ASSEMBLER__
+#include <stddef.h>
+void *memcpy(void *dst, const void *src, size_t n);
+void *memset(void *s, int c, size_t n);
+void *memmove(void *dest, const void *src, size_t n);
+int memcmp(const void *s1, const void *s2, size_t n);
+size_t strlen(const char *s);
+#endif