TOOLS/bios2dump.c

   1 /*
   2     bios2dump.c - Was designed to extract BIOS of your PC and save it to file.
   3     Usage: as argument requires DOS interrupt number in hexadecimal form.
   4     as output - will write 64KB file which will named: SSSS_OOOO.intXX
   5     where: SSSS - segment of BIOS interrupt handler
   6            OOOO - offset of BIOS interrupt handler
   7            XX   - interrupt number which was passed as argument
   8     Licence: GNU GPL v2
   9     Copyright: Nick Kurshev <nickols_k@mail.ru>
  10 */
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13
  14 int main( int argc, char *argv[])
  15 {
  16   FILE * fd_mem, *fd_out;
  17   unsigned short int_seg,int_off;
  18   unsigned long bios_off;
  19   int int_no;
  20   size_t i;
  21   char outname[80];
  22   unsigned char ch;
  23   if(argc < 2)
  24   {
  25     printf("Usage: %s int_no(in hex)\n",argv[0]);
  26     return EXIT_FAILURE;
  27   }
  28   int_no = strtol(argv[1],NULL,16);
  29   if(!(fd_mem = fopen("/dev/mem","rb")))
  30   {
  31     perror("Can't open file - /dev/mem");
  32     return EXIT_FAILURE;
  33   }
  34   fseek(fd_mem,int_no*4,SEEK_SET);
  35   fread(&int_off,sizeof(unsigned short),1,fd_mem);
  36   fread(&int_seg,sizeof(unsigned short),1,fd_mem);
  37   sprintf(outname,"%04X_%04X.int%02X",int_seg,int_off,int_no);
  38   if(!(fd_out = fopen(outname,"wb")))
  39   {
  40     perror("Can't open output file");
  41     fclose(fd_mem);
  42     return EXIT_FAILURE;
  43   }
  44   bios_off = (int_seg << 4) + int_off;
  45   bios_off &= 0xf0000;
  46   fseek(fd_mem,bios_off,SEEK_SET);
  47   for(i=0;i<0x10000;i++)
  48   {
  49     fread(&ch,1,1,fd_mem);
  50     fwrite(&ch,1,1,fd_out);
  51   }
  52   fclose(fd_out);
  53   fclose(fd_mem);
  54   return EXIT_SUCCESS;
  55 }