#include <pc.h>
#include <unistd.h>

int numeric[] = { 1, 2, 4, 8, 16, 33, 66, 100 };

void show() {
  unsigned short reg, i;
  outportb(0x22,0x80);
  reg = inportb(0x23);
  i = reg >> 5;
  if ( i > 5 ) i += reg & 1;
  printf("%d",numeric[i]);
}

void setclk(int hyper, int speed) {
  unsigned short reg;

  outportb(0x22,0x80);
  reg = inportb(0x23);
  outportb(0x22,0x80);
  outportb(0x23,reg & 0xFE | hyper);

  outportb(0x22,0x40);
  reg = inportb(0x23);
  outportb(0x22,0x40);
  outportb(0x23,reg & 0xF8 | speed);
}

main(int argc, char **argv) {
  if (argc == 2) {
    switch (argv[1][0]) {
      case '3': setclk(0,0); break;
      case '6': setclk(0,1); break;
      case '9':
      case '1': setclk(1,1); break;
    }
  }
  sleep(1);
  show();
}