com32/modules/vesainfo.c

   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 */
  15 static void wait_key(void)
  16 {
  17     char ch;
  18     while (fread(&ch, 1, 1, stdin) == 0) ;
  19 }
  20
  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         gi->signature = VBE2_MAGIC;     /* Get VBE2 extended data */
  40         rm.eax.w[0] = 0x4F00;   /* Get SVGA general information */
  41         rm.edi.w[0] = OFFS(gi);
  42         rm.es = SEG(gi);
  43         __intcall(0x10, &rm, &rm);
  44
  45     if (rm.eax.w[0] != 0x004F) {
  46         printf("No VESA BIOS detected\n");
  47         goto exit;
  48     } else if (gi->signature != VESA_MAGIC) {
  49         printf("VESA information structure has bad magic, trying anyway...\n");
  50     }
  51
  52     printf("VBE version %d.%d\n"
  53            "Mode   attrib h_res v_res bpp layout rpos gpos bpos\n",
  54            (gi->version >> 8) & 0xff, gi->version & 0xff);
  55
  56     lines = 1;
  57
  58     mode_ptr = GET_PTR(gi->video_mode_ptr);
  59
  60     while ((mode = *mode_ptr++) != 0xFFFF) {
  61         if (++lines >= 23) {
  62             wait_key();
  63             lines = 0;
  64         }
  65
  66         rm.eax.w[0] = 0x4F01;   /* Get SVGA mode information */
  67         rm.ecx.w[0] = mode;
  68         rm.edi.w[0] = OFFS(mi);
  69         rm.es = SEG(mi);
  70         __intcall(0x10, &rm, &rm);
  71
  72         /* Must be a supported mode */
  73         if (rm.eax.w[0] != 0x004f)
  74             continue;
  75
  76         printf("0x%04x 0x%04x %5u %5u %3u %6u %4u %4u %4u\n",
  77                mode, mi->mode_attr, mi->h_res, mi->v_res, mi->bpp,
  78                mi->memory_layout, mi->rpos, mi->gpos, mi->bpos);
  79     }
  80
  81 exit:
  82         lfree(vesa);
  83         return;
  84 }
  85
  86 int main(int argc __unused, char **argv __unused)
  87 {
  88     print_modes();
  89     return 0;
  90 }