diff --git a/entry/boot.c b/entry/boot.c
index f8ed564..a492f0a 100644
--- a/entry/boot.c
+++ b/entry/boot.c
@@ -1,18 +1,4 @@
-#define beige                   0xBE
-#define mac99                   0x5A
-
-#define __VRAM__BEIGE           0x80000000
-#define __BIOS__BEIGE           0xFFC00000
-
-#define __VRAM__MAC99           0x81000000
-#define __BIOS__MAC99           0XFFF00000
-#define __MOUSE__MAC99          0x8008003C
-#define __KEYBOARD__MAC99       0x80080038
-unsigned char  IO_TYPE;
-unsigned char* p_vram;
-unsigned char* p_bios;
-unsigned char* p_keyboard;
-unsigned char* p_mouse;
+#include "boot.h"
 void get_io_type(void)
 {
         if (*(unsigned char*)__VRAM__BEIGE == beige) IO_TYPE = beige;
@@ -38,7 +24,10 @@ void main(void)
 {
 	get_io_type();
 	init();
-	for(;;)	memcpy_24bit(0x81000000, p_mouse, 1, 0x100000);
+	for(;;)	
+	{
+		memcpy_24bit(0x81000000, p_mouse, 1, 0x100000);
+	}
 	
 }
 
@@ -58,7 +47,6 @@ void fillscreen(unsigned char a, unsigned char b, unsigned char c, int n)
 		p_vram++;
 	}
 }
-
 void memcpy(unsigned char* dest, unsigned char* src, int n)
 {
 	unsigned char* destination = dest;
@@ -69,7 +57,6 @@ void memcpy(unsigned char* dest, unsigned char* src, int n)
 		destination++; source++;
 	}
 }
-
 void memcpy_24bit(unsigned char* dest, unsigned char* src, int n, int size)
 {
         unsigned char* destination = dest;
diff --git a/entry/boot.h b/entry/boot.h
new file mode 100644
index 0000000..6239096
--- /dev/null
+++ b/entry/boot.h
@@ -0,0 +1,24 @@
+#define beige                   0xBE
+#define mac99                   0x5A
+
+#define __VRAM__BEIGE           0x80000000
+#define __BIOS__BEIGE           0xFFC00000
+
+#define __VRAM__MAC99           0x81000000
+#define __BIOS__MAC99           0XFFF00000
+#define __MOUSE__MAC99          0x8008003C
+#define __KEYBOARD__MAC99       0x80080038
+unsigned char  IO_TYPE;
+unsigned char* p_vram;
+unsigned char* p_bios;
+unsigned char* p_keyboard;
+unsigned char* p_mouse;
+
+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);
+unsigned char u8_extract_bit(unsigned char n, unsigned char bit);
+unsigned char u32_extract_bit(unsigned int n, unsigned char bit);