/*	$OpenBSD: intr.c,v 1.2 2007/11/14 20:47:34 thib Exp $	*/

/*
 * Copyright (c) 1997 Per Fogelstrom, Opsycon AB and RTMX Inc, USA.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed under OpenBSD by
 *	Per Fogelstrom, Opsycon AB, Sweden for RTMX Inc, North Carolina USA.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 */
#include <sys/param.h>

#include <machine/cpu.h>
#include <machine/intr.h>

int
splraise(int newcpl)
{
	struct cpu_info *ci = curcpu();
	int oldcpl;

	__asm__ volatile("":::"memory");	/* reorder protect */
	oldcpl = ci->ci_cpl;
	ci->ci_cpl = oldcpl | newcpl;
	__asm__ volatile("":::"memory");

	return (oldcpl);
}

int
spllower(int newcpl)
{
	struct cpu_info *ci = curcpu();
	int oldcpl;

	__asm__ volatile("":::"memory");	/* reorder protect */
	oldcpl = ci->ci_cpl;
	ci->ci_cpl = newcpl;
	if (ci->ci_ipending & ~newcpl)
		do_pending_int();
	__asm__ volatile("":::"memory");

	return (oldcpl);
}

void
splx(int newcpl)
{
	struct cpu_info *ci = curcpu();

	__asm__ volatile("":::"memory");	/* reorder protect */
	ci->ci_cpl = newcpl;
	if (ci->ci_ipending & ~newcpl)
		do_pending_int();
	__asm__ volatile("":::"memory");
}