/* 簡単なI/Oテスト: 
 * gcc -O -o beep beep.c
 * 参考: /usr/src/linux/drivers/char/vt.c  */
#include <stdio.h>
#include <asm/io.h>
#include <unistd.h>
#include <sys/io.h>

int main(void)
{
  unsigned int count;
  /* 一括 */
  if(iopl(3))
  /* 部分 */
    /*if((ioperm(0x0040, 4, 1))||(ioperm(0x0061, 1, 1)))*/
    {
      perror("iopl/ioperm");
      return 1;
    }

  count=1193180/1000;      /* 1000 Hz */
  outb(inb(0x61)|3, 0x61); /* beep on */
  outb(0xb6, 0x43);        /* set freq */
  outb(count & 0xff, 0x42);
  outb((count>>8) & 0xff, 0x42);

  sleep(1);
  outb(inb(0x61)&0xfc, 0x61); /*  off */
  return 0;
}