/*
 * cmosdump - dump the CMOS contents on x86.
 *
 * Copyright 2002 Jason Spence <jspence@lightconsulting.com>
 */

#include <stdio.h>
#include <sys/io.h>
#include <err.h>

int main(void) {
  int i;
  int rc;
  unsigned char b;

  rc = iopl(3);
  if(rc == -1) {
    err(1, "You must be root to run this program.");
  }

  // Don't run two of these at the same time!  There's no synchronization
  // mechanism for the CMOS resources.
  for(i = 0; i < 65536; ++i) {
    outb(i, 0x72);

    // You can do a outb here instead to write a value
    printf("%c", inb(0x73));
  }

  return 0;
}