Writing (debug output) to screen

src/kernel/include/vga.h

@@ -0,0 +1,14 @@
+#pragma once
+
+#define VGA_COLS 80
+#define VGA_ROWS 24
+#define VGA_SIZE (VGA_COLS*VGA_ROWS)
+
+#define VGA_ROW(pos) ((pos)/VGA_COLS)
+#define VGA_COL(pos) ((pos)%VGA_COLS)
+#define VGA_POS(row, col) ((row)*VGA_COLS + (col))
+
+#define VGA_MEMORY P2V(0xB8000)
+
+void vga_init();
+void vga_write(char c);