Initial import

1 files changed, 24 insertions, 0 deletions

diff --git a/src/vga.c b/src/vga.c
new file mode 100644
index 0000000..5badd82
--- /dev/null
+++ b/src/vga.c
@@ -0,0 +1,24 @@
+#include <stdlib.h>
+#include <stdint.h>
+#include <dpmi.h>
+#include <sys/nearptr.h>
+
+uint8_t *open_framebuffer()
+{
+    if (__djgpp_nearptr_enable() == 0)
+        return NULL;
+
+    return (uint8_t *)(0xa0000 + __djgpp_conventional_base);
+}
+
+void close_framebuffer()
+{
+    __djgpp_nearptr_disable();
+}
+
+void set_mode(uint8_t mode)
+{
+    __dpmi_regs regs = { 0 };
+    regs.x.ax = mode;
+    __dpmi_int(0x10, &regs);
+}