Add VGA color constants

fb.c

@@ -18,7 +18,7 @@ void fb_move_cursor(unsigned short pos)
 int fb_write(char *buf, unsigned int len) {
 
     for(int i = 0; i <= (int)len; i++) {
-        fb_write_cell(get_cursor_position() * 2, buf[i], 0, 15);
+        fb_write_cell(get_cursor_position() * 2, buf[i], VGA_COLOR_BLACK, VGA_COLOR_WHITE);
         advance_cursor();
     }
     return 0;

fb.h

@@ -1,6 +1,8 @@
 #ifndef INCLUDE_FRAMEBUFFER
 #define INCLUDE_FRAMEBUFFER
 
+#include "io.h"
+
 /* The I/O ports */
 #define FB_COMMAND_PORT 0x3D4
 #define FB_DATA_PORT 0x3D5
@@ -9,7 +11,23 @@
 #define FB_HIGH_BYTE_COMMAND 14
 #define FB_LOW_BYTE_COMMAND 15
 
-#include "io.h"
+#define VGA_COLOR_BLACK 0
+#define VGA_COLOR_BLUE 1
+#define VGA_COLOR_GREEN 2
+#define VGA_COLOR_CYAN 3
+#define VGA_COLOR_RED 4
+#define VGA_COLOR_MAGENTA 5
+#define VGA_COLOR_BROWN 6
+#define VGA_COLOR_LIGHT_GREY 7
+#define VGA_COLOR_DARK_GREY 8
+#define VGA_COLOR_LIGHT_BLUE 9
+#define VGA_COLOR_LIGHT_GREEN 10
+#define VGA_COLOR_LIGHT_CYAN 11
+#define VGA_COLOR_LIGHT_RED 12
+#define VGA_COLOR_LIGHT_MAGENTA 13
+#define VGA_COLOR_LIGHT_BROWN 14
+#define VGA_COLOR_WHITE 15
+
 
 int fb_write(char *buf, unsigned int len);