109 lines
1.8 KiB
C
109 lines
1.8 KiB
C
#include <types.h>
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#include <x86.h>
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#include "defs.h"
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void
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cons_putc(int c)
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{
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int crtport = 0x3d4; // io port of CGA
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unsigned short *crt = (unsigned short *) 0xB8000; // base of CGA memory
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int ind;
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// cursor position, 16 bits, col + 80*row
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outb(crtport, 14);
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ind = inb(crtport + 1) << 8;
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outb(crtport, 15);
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ind |= inb(crtport + 1);
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c &= 0xff;
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if(c == '\n'){
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ind -= (ind % 80);
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ind += 80;
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} else {
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c |= 0x0700; // black on white
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crt[ind] = c;
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ind += 1;
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}
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if((ind / 80) >= 24){
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// scroll up
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memcpy(crt, crt + 80, sizeof(crt[0]) * (23 * 80));
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ind -= 80;
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memset(crt + ind, 0, sizeof(crt[0]) * ((24 * 80) - ind));
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}
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outb(crtport, 14);
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outb(crtport + 1, ind >> 8);
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outb(crtport, 15);
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outb(crtport + 1, ind);
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}
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void
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printint(int xx, int base, int sgn)
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{
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char buf[16];
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char digits[] = "0123456789ABCDEF";
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int i = 0, neg = 0;
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unsigned int x;
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if(sgn && xx < 0){
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neg = 1;
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x = 0 - xx;
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} else {
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x = xx;
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}
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do {
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buf[i++] = digits[x % base];
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} while((x /= base) != 0);
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if(neg)
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buf[i++] = '-';
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while(i > 0){
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i -= 1;
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cons_putc(buf[i]);
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}
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}
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/*
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* print to the console. only understands %d and %x.
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*/
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void
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cprintf(char *fmt, ...)
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{
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int i, state = 0, c;
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unsigned int *ap = (unsigned int *) &fmt + 1;
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for(i = 0; fmt[i]; i++){
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c = fmt[i] & 0xff;
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if(state == 0){
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if(c == '%'){
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state = '%';
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} else {
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cons_putc(c);
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}
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} else if(state == '%'){
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if(c == 'd'){
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printint(*ap, 10, 1);
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ap++;
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} else if(c == 'x'){
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printint(*ap, 16, 0);
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ap++;
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} else if(c == '%'){
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cons_putc(c);
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}
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state = 0;
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}
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}
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}
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void
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panic(char *s)
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{
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cprintf(s, 0);
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cprintf("\n", 0);
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while(1)
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;
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}
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