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 */
wait_key(void)15 static void wait_key(void)
16 {
17 char ch;
18 while (fread(&ch, 1, 1, stdin) == 0) ;
19 }
20
print_modes(void)21 static 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
83 exit:
84 lfree(vesa);
85 return;
86 }
87
main(int argc __unused,char ** argv __unused)88 int main(int argc __unused, char **argv __unused)
89 {
90 print_modes();
91 return 0;
92 }
93