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/*
bios2dump.c - Was designed to extract BIOS of your PC and save it to file.
Usage: as argument requires DOS interrupt number in hexadecimal form.
as output - will write 64KB file which will named: SSSS_OOOO.intXX
where: SSSS - segment of BIOS interrupt handler
OOOO - offset of BIOS interrupt handler
XX - interrupt number which was passed as argument
Licence: GNU GPL v2
Copyright: Nick Kurshev <nickols_k@mail.ru>
*/
#include <stdio.h>
#include <stdlib.h>
int main( int argc, char *argv[])
{
FILE * fd_mem, *fd_out;
unsigned short int_seg,int_off;
unsigned long bios_off;
int int_no;
size_t i;
char outname[80];
unsigned char ch;
if(argc < 2)
{
printf("Usage: %s int_no(in hex)\n",argv[0]);
return EXIT_FAILURE;
}
int_no = strtol(argv[1],NULL,16);
if(!(fd_mem = fopen("/dev/mem","rb")))
{
perror("Can't open file - /dev/mem");
return EXIT_FAILURE;
}
fseek(fd_mem,int_no*4,SEEK_SET);
fread(&int_off,sizeof(unsigned short),1,fd_mem);
fread(&int_seg,sizeof(unsigned short),1,fd_mem);
sprintf(outname,"%04X_%04X.int%02X",int_seg,int_off,int_no);
if(!(fd_out = fopen(outname,"wb")))
{
perror("Can't open output file");
fclose(fd_mem);
return EXIT_FAILURE;
}
bios_off = (int_seg << 4) + int_off;
bios_off &= 0xf0000;
fseek(fd_mem,bios_off,SEEK_SET);
for(i=0;i<0x10000;i++)
{
fread(&ch,1,1,fd_mem);
fwrite(&ch,1,1,fd_out);
}
fclose(fd_out);
fclose(fd_mem);
return EXIT_SUCCESS;
}
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