infinite hardware scrolling

[3sys] / sys1 / kern / src / main.c

diff --git a/sys1/kern/src/main.c b/sys1/kern/src/main.c
index b89a98b..00d3882 100644 (file)
--- a/sys1/kern/src/main.c
+++ b/sys1/kern/src/main.c
@@ -1,22 +1,42 @@
+#include <stdio.h>
 #include <string.h>
 #include <stdint.h>
-
-void clearscr(void)
-{
-       memset((void*)0xb8000, 0, 80 * 25 * 2);
-}
+#include "vga.h"
 
 void drawtext(int x, int y, const char *s)
 {
-       uint16_t *vptr = (uint16_t*)0xb8000 + y * 80 + x;
-
        while(*s) {
-               *vptr++ = 0x0c00 | *s++;
+               vga_drawchar(x++, y, *s++);
        }
 }
 
 void kmain(void)
 {
-       clearscr();
-       drawtext(10, 5, "3sys kernel 1");
+       int i, row;
+       int line, scroll;
+       char buf[64];
+       char twirl[] = "-\\|/";
+
+       vga_reset();
+
+       line = 0;
+       for(;;) {
+               scroll = line <= 24 ? 0 : line - 24;
+               row = line <= 24 ? line : 24;
+               sprintf(buf, "line %d  (scroll %d [%d])", line, scroll, scroll % 25);
+               vga_scroll(scroll);
+               if(scroll) {
+                       vga_clearline(24);
+               }
+               vga_setcolor(VGA_YELLOW | VGA_BRIGHT, VGA_BLACK);
+               drawtext(line & 7, row, buf);
+
+               for(i=0; i<65536 * 4; i++) {
+                       buf[0] = twirl[(i >> 18) & 3];
+                       buf[1] = 0;
+                       vga_setcolor(VGA_WHITE, VGA_BLACK);
+                       drawtext(50, row, buf);
+               }
+               line++;
+       }
 }