nuclear@0: #include <string.h>
nuclear@0: #include "vid.h"
nuclear@0: 
nuclear@0: static uint16_t *vmem = (uint16_t*)0xb8000;
nuclear@0: 
nuclear@1: void clear_scr(int color)
nuclear@0: {
nuclear@0: 	memset(vmem, 0, WIDTH * HEIGHT * 2);
nuclear@0: }
nuclear@0: 
nuclear@1: void set_char(char c, int x, int y, int fg, int bg)
nuclear@0: {
nuclear@1: 	uint16_t attr = (fg & 0xf) | ((bg & 7) << 4);
nuclear@1: 	vmem[y * WIDTH + x] = (uint16_t)c | (attr << 8);
nuclear@0: }
nuclear@0: 
nuclear@1: void scroll_scr(void)
nuclear@0: {
nuclear@1: 	/* copy the second up to last text line, one line back, then
nuclear@1: 	 * clear the last line.
nuclear@1: 	 */
nuclear@1: 	memmove(vmem, vmem + WIDTH, WIDTH * (HEIGHT - 1) * 2);
nuclear@1: 	memset(vmem + WIDTH * (HEIGHT -1), 0, WIDTH * 2);
nuclear@0: }