1/*
2 * vesainfo.c
3 *
4 * Dump information about what VESA graphics modes are supported.
5 */
6
7#include <string.h>
8#include <stdio.h>
9#include <console.h>
10#include <com32.h>
11#include <inttypes.h>
12#include "../lib/sys/vesa/vesa.h"
13
14/* Wait for a keypress */
15static void wait_key(void)
16{
17    char ch;
18    while (fread(&ch, 1, 1, stdin) == 0) ;
19}
20
21static void print_modes(void)
22{
23	static com32sys_t rm;
24	struct vesa_general_info *gi;
25	struct vesa_mode_info *mi;
26	uint16_t mode, *mode_ptr;
27	int lines;
28
29	struct vesa_info *vesa;
30
31	vesa = lmalloc(sizeof(*vesa));
32	if (!vesa) {
33		printf("vesainfo.c32: fail in lmalloc\n");
34		return;
35	}
36	gi = &vesa->gi;
37	mi = &vesa->mi;
38
39        memset(&rm, 0, sizeof rm);
40	gi->signature = VBE2_MAGIC;	/* Get VBE2 extended data */
41	rm.eax.w[0] = 0x4F00;	/* Get SVGA general information */
42	rm.edi.w[0] = OFFS(gi);
43	rm.es = SEG(gi);
44	__intcall(0x10, &rm, &rm);
45
46    if (rm.eax.w[0] != 0x004F) {
47	printf("No VESA BIOS detected\n");
48	goto exit;
49    } else if (gi->signature != VESA_MAGIC) {
50	printf("VESA information structure has bad magic, trying anyway...\n");
51    }
52
53    printf("VBE version %d.%d\n"
54	   "Mode   attrib h_res v_res bpp layout rpos gpos bpos\n",
55	   (gi->version >> 8) & 0xff, gi->version & 0xff);
56
57    lines = 1;
58
59    mode_ptr = GET_PTR(gi->video_mode_ptr);
60
61    while ((mode = *mode_ptr++) != 0xFFFF) {
62	if (++lines >= 23) {
63	    wait_key();
64	    lines = 0;
65	}
66
67        memset(&rm, 0, sizeof rm);
68	rm.eax.w[0] = 0x4F01;	/* Get SVGA mode information */
69	rm.ecx.w[0] = mode;
70	rm.edi.w[0] = OFFS(mi);
71	rm.es = SEG(mi);
72	__intcall(0x10, &rm, &rm);
73
74	/* Must be a supported mode */
75	if (rm.eax.w[0] != 0x004f)
76	    continue;
77
78	printf("0x%04x 0x%04x %5u %5u %3u %6u %4u %4u %4u\n",
79	       mode, mi->mode_attr, mi->h_res, mi->v_res, mi->bpp,
80	       mi->memory_layout, mi->rpos, mi->gpos, mi->bpos);
81    }
82
83exit:
84	lfree(vesa);
85	return;
86}
87
88int main(int argc __unused, char **argv __unused)
89{
90    print_modes();
91    return 0;
92}
93