Intial commit

src/vga.c

@@ -0,0 +1,39 @@
+/** 
+ * Copyright (c) 2014 rxi
+ *
+ * This library is free software; you can redistribute it and/or modify it
+ * under the terms of the MIT license. See LICENSE for details.
+ */
+
+#include <assert.h>
+#include <stdlib.h>
+#include <string.h>
+#include <dos.h>
+#include <sys/movedata.h>
+
+#include "vga.h"
+
+int vga_inited = 0;
+
+
+void vga_init(void) {
+  if (vga_inited) return;
+  vga_inited = 1;
+  union REGS regs = {};
+  regs.h.al = 0x13;
+  int86(0x10, &regs, &regs);
+}
+
+
+void vga_deinit(void) {
+  if (!vga_inited) return;
+  vga_inited = 0;
+  union REGS regs = {};
+  regs.h.al = 0x3;
+  int86(0x10, &regs, &regs);
+}
+
+
+void vga_update(pixel_t *buffer) {
+  dosmemput(buffer, VGA_WIDTH * VGA_HEIGHT, 0xa0000);
+}