Made screen.h actually good

src/kernel/screen.h

@@ -1,9 +1,32 @@
 #ifndef SCREEN_H
 #define SCREEN_H
 
-#define VIDMEM 0xb8000
+#include "stdint.h"
 
-void putc(char c, char attr);
-void print(char* s, char attr);
+#define VIDMEM 0xb8000
+#define CURSOR_HIGH 14
+#define CURSOR_LOW 15
+#define CTRLREG 0x3d4
+#define DATAREG 0x3d5
+
+// 80x25 VGA Text mode
+#define ROWS 25
+#define COLS 80
+#define CHARS (ROWS*COLS)
+
+#define CURSOR '_'
+
+void putc(char c, uint8_t attr);
+void print(char* s, uint8_t attr);
+void putcAt(char c, uint8_t attr, uint8_t row, uint8_t col);
+void printAt(char* s, uint8_t attr, uint8_t row, uint8_t col);
+void clear(uint8_t attr);
+
+void setCursorPos(uint16_t offset);
+uint16_t getCursorPos();
+uint16_t calcOffset(uint8_t row, uint8_t col);
+
+void setCursorChar(char cursor);
+char getCursorChar();
 
 #endif