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     /* Allocate space in the bounce buffer for these structures */
  30     gi = &((struct vesa_info *)__com32.cs_bounce)->gi;
  31     mi = &((struct vesa_info *)__com32.cs_bounce)->mi;
  32
  33     gi->signature = VBE2_MAGIC; /* Get VBE2 extended data */
  34     rm.eax.w[0] = 0x4F00;       /* Get SVGA general information */
  35     rm.edi.w[0] = OFFS(gi);
  36     rm.es = SEG(gi);
  37     __intcall(0x10, &rm, &rm);
  38
  39     if (rm.eax.w[0] != 0x004F) {
  40         printf("No VESA BIOS detected\n");
  41         return;
  42     } else if (gi->signature != VESA_MAGIC) {
  43         printf("VESA information structure has bad magic, trying anyway...\n");
  44     }
  45
  46     printf("VBE version %d.%d\n"
  47            "Mode   attrib h_res v_res bpp layout rpos gpos bpos\n",
  48            (gi->version >> 8) & 0xff, gi->version & 0xff);
  49
  50     lines = 1;
  51
  52     mode_ptr = GET_PTR(gi->video_mode_ptr);
  53
  54     while ((mode = *mode_ptr++) != 0xFFFF) {
  55         if (++lines >= 23) {
  56             wait_key();
  57             lines = 0;
  58         }
  59
  60         rm.eax.w[0] = 0x4F01;   /* Get SVGA mode information */
  61         rm.ecx.w[0] = mode;
  62         rm.edi.w[0] = OFFS(mi);
  63         rm.es = SEG(mi);
  64         __intcall(0x10, &rm, &rm);
  65
  66         /* Must be a supported mode */
  67         if (rm.eax.w[0] != 0x004f)
  68             continue;
  69
  70         printf("0x%04x 0x%04x %5u %5u %3u %6u %4u %4u %4u\n",
  71                mode, mi->mode_attr, mi->h_res, mi->v_res, mi->bpp,
  72                mi->memory_layout, mi->rpos, mi->gpos, mi->bpos);
  73     }
  74 }
  75
  76 int main(void)
  77 {
  78     openconsole(&dev_rawcon_r, &dev_stdcon_w);
  79
  80     print_modes();
  81     return 0;
  82 }