Note on FVCool,  Apr. 6, 2006.

The scheduling procedure is changed in FreeBSD ver.5.xx.  The document
of ver.1.04 for KT133/A series chipset on FreeBSD ver.4.xx does not
work anymore.  I am not so sure, but the following changes of functions,

		cpu_idle_default(), cpu_idle()
in
		/usr/src/sys/i386/i386/machdep.c

seems to work.  Please try at your own risk!
------------------------------------------------------------------
Here 0xAAAA is the PLVL_2 register address FVCool will tell you
when exected with -v and -e options.
------------------------------------------------------------------
static void
cpu_idle_default(void)
{
		/*
		 *	added for idle-hlt for 82C686
		 */
		__asm __volatile("movl $0xAAAA,%edx");
		__asm __volatile("inb %dx,%al");
		/*
		 *	end of addition
		 */
	/*
	 * we must absolutely guarentee that hlt is the
	 * absolute next instruction after sti or we
	 * introduce a timing window.
	 */
	__asm __volatile("sti; hlt");
}

void
cpu_idle(void)
{

#ifdef SMP
	if (mp_grab_cpu_hlt())
		return;
#endif

	if (cpu_idle_hlt) {
			/*
			 *	added for idle-hlt for 82C686
			 */
			__asm __volatile("movl $0xAAAA,%edx");
			__asm __volatile("inb %dx,%al");
			/*
			 *	end of addition
			 */

		disable_intr();
  		if (sched_runnable())
			enable_intr();
		else
			(*cpu_idle_hook)();

			/*
			 *	added for idle-hlt for 82C686
			 */
			__asm __volatile("movl $0xAAAA,%edx");
			__asm __volatile("inb %dx,%al");
			/*
			 *	end of addition
			 */
	}
}
------------------------------------------------------------------