#include <fcntl.h>#include <stdio.h>#include <stdlib.h>#ifndef	__TURBOC__#include <sys/mman.h>#include <sys/stat.h>#include <sys/types.h>#include <unistd.h>#endif#ifdef	__TURBOC__#define	HUGE	huge#else#define	HUGE#endif#define ROMSTART     0xC8000#define ROMEND       0xE8000#define ROMINCREMENT 0x00800#define ROMMASK      0x03FFF#ifndef MAP_FAILED#define MAP_FAILED ((void *)(long long)-1)#endiftypedef struct Images {  struct Images *next;  long           start;  long           size;} Images;static void rom_scan(const unsigned char HUGE *rom,long offset,long len){  static Images *images = NULL;  Images *ptr;/* The assignments to dummy are to overcome a bug in TurboC */  long dummy, size;  int chksum;  long i;    if (rom[offset] != 0x55 || rom[dummy = offset+1] != 0xAA)    return;  size = (long)rom[dummy = offset+2]*512L;  printf("Found ROM header at %04lX:0000; "	 "announces %ldk image (27C%02d EPROM)\n",	 offset/16,(size+512)/1024,	 size <=  1024 ?   8 :	 size <=  2048 ?  16 :	 size <=  4096 ?  32 :	 size <=  8192 ?  64 :	 size <= 16384 ? 128 :	 size <= 32768 ? 256 :	 size <= 65536 ? 512 : 11);  if (offset & ROMMASK)    printf("  This is a unusual position; not all BIOSs might find it.\n"	   "   Try to move to a 16kB boundary.\n");  if (size > len) {    printf("  This image extends beyond %04X:0000. "	   "It clashes with the system BIOS\n",	   ROMEND/16);    size = len; }  for (chksum=0, i = size; i--; chksum += rom[dummy = offset+i]);  if (chksum % 256)    printf("  Checksum does not match. This image is not active\n");  ptr        = malloc(sizeof(Images));  ptr->next  = images;  ptr->start = offset;  ptr->size  = size;  images     = ptr;  for (ptr = ptr->next; ptr != NULL; ptr = ptr->next) {    for (i = 0; i < size && i < ptr->size; i++)      if (rom[dummy = ptr->start+i] != rom[dummy = offset+i])	break;    if (i > 32) {      printf("   Image is identical with image at %04lX:0000 "	     "for the first %ld bytes\n",	     ptr->start/16,i);      if (i >= 1024)	if (i == size)	  printf("    this means that you misconfigured the EPROM size!\n");	else	  printf("    this could suggest that you misconfigured the "		 "EPROM size\n");      else	printf("    this is probably harmless. Just ignore it...\n"); } }  return;}int main(void){  long  i;  unsigned char HUGE *rom;#ifndef	__TURBOC__  int	fh;  if ((fh = open("/dev/kmem",O_RDONLY|O_SYNC)) < 0) {    fprintf(stderr,"Could not open \"/dev/kmem\": %s\n",strerror(errno));    return(1); }  if ((rom = mmap(NULL,ROMEND-ROMSTART,PROT_READ,MAP_SHARED,fh,		  ROMSTART)) == MAP_FAILED) {    fprintf(stderr,"Could not mmap \"/dev/kmem\": %s\n",strerror(errno));    close(fh);    return(1); }  close(fh);#endif  for (i = ROMEND; (i -= ROMINCREMENT) >= ROMSTART; )#ifdef	__TURBOC__    rom_scan(0,i,ROMEND-i);#else    rom_scan(rom-ROMSTART,i,ROMEND-i);  munmap(rom,ROMEND-ROMSTART);#endif  return(0);}