diff --git a/entry/boot.h b/entry/boot.h
index 6239096..b2f4fc6 100644
--- a/entry/boot.h
+++ b/entry/boot.h
@@ -18,7 +18,7 @@ unsigned char u8_extract_bit(unsigned char n, unsigned char bit);
 void get_io_type(void);
 void init(void);
 void fillscreen(unsigned char a, unsigned char b, unsigned char c, int n);
-//void memcpy(unsigned char* dest, unsigned char* src, int n);
-//void memcpy_24bit(unsigned char* dest, unsigned char* src, int n, int size);
+void memcpy(unsigned char* dest, unsigned char* src, int n);
+void memcpy_24bit(unsigned char* dest, unsigned char* src, int n, int size);
 unsigned char u8_extract_bit(unsigned char n, unsigned char bit);
 unsigned char u32_extract_bit(unsigned int n, unsigned char bit);