com32/sysdump/vesa.c

   1 #include <string.h>
   2 #include <stdio.h>
   3 #include <lib/sys/vesa/vesa.h>
   4 #include "sysdump.h"
   5
   6 void dump_vesa_tables(struct upload_backend *be)
   7 {
   8     com32sys_t rm;
   9     struct vesa_info *vip;
  10     struct vesa_general_info *gip, gi;
  11     struct vesa_mode_info *mip, mi;
  12     uint16_t mode, *mode_ptr;
  13     char modefile[64];
  14
  15     printf("Scanning VESA BIOS... ");
  16
  17     /* Allocate space in the bounce buffer for these structures */
  18     vip = lmalloc(sizeof *vip);
  19     gip = &vip->gi;
  20     mip = &vip->mi;
  21
  22     memset(&rm, 0, sizeof rm);
  23     memset(gip, 0, sizeof *gip);
  24
  25     gip->signature = VBE2_MAGIC;        /* Get VBE2 extended data */
  26     rm.eax.w[0] = 0x4F00;               /* Get SVGA general information */
  27     rm.edi.w[0] = OFFS(gip);
  28     rm.es = SEG(gip);
  29     __intcall(0x10, &rm, &rm);
  30     memcpy(&gi, gip, sizeof gi);
  31
  32     if (rm.eax.w[0] != 0x004F)
  33         return;         /* Function call failed */
  34     if (gi.signature != VESA_MAGIC)
  35         return;         /* No magic */
  36
  37     cpio_mkdir(be, "vesa");
  38
  39     cpio_writefile(be, "vesa/global.bin", &gi, sizeof gi);
  40
  41     mode_ptr = GET_PTR(gi.video_mode_ptr);
  42     while ((mode = *mode_ptr++) != 0xFFFF) {
  43         memset(mip, 0, sizeof *mip);
  44         rm.eax.w[0] = 0x4F01;   /* Get SVGA mode information */
  45         rm.ecx.w[0] = mode;
  46         rm.edi.w[0] = OFFS(mip);
  47         rm.es = SEG(mip);
  48         __intcall(0x10, &rm, &rm);
  49
  50         /* Must be a supported mode */
  51         if (rm.eax.w[0] != 0x004f)
  52             continue;
  53
  54         memcpy(&mi, mip, sizeof mi);
  55
  56         sprintf(modefile, "vesa/mode%04x.bin", mode);
  57         cpio_writefile(be, modefile, &mi, sizeof mi);
  58     }
  59
  60     lfree(vip);
  61     printf("done.\n");
  62 }