playing with vga struct, fixed some boot loading issues

1 files changed, 31 insertions, 0 deletions

diff --git a/src/vga.c b/src/vga.c
index 26208a0..77ef043 100644
--- a/src/vga.c
+++ b/src/vga.c
@@ -1 +1,32 @@
 #include "vga.h"
+
+#include "string.h"
+
+void vga_init( vga_t *vga )
+{
+	memset( vga, 0, sizeof( vga_t ) );
+
+	vga->res_x = VGA_DEFAULT_RES_X;
+	vga->res_y = VGA_DEFAULT_RES_Y;
+	
+	// TODO: get current position from VGA hardware
+	//~ vga_set_cursor( vga, 0, 0 );
+};
+
+void vga_clear_screen( vga_t *vga )
+{
+	volatile uint8_t *VIDEO_MEMORY = (uint8_t *)0xb8000;
+
+	for( int i = 0; i < 2 * ( vga->res_x * vga->res_y ); i += 2 ) {
+		*(VIDEO_MEMORY+i) = ' ';
+		*(VIDEO_MEMORY+i+1) = 0x4f;
+	}
+	
+	//~ vga_set_cursor( vga, 0, 0 );
+}
+
+void vga_set_cursor( vga_t *vga, int x, int y )
+{
+	vga->cursor_x = x;
+	vga->cursor_y = y;
+}