1/*	$NetBSD: psl.h,v 1.15 2012/07/27 05:36:11 matt Exp $	*/
  2
  3/*
  4 * Copyright (c) 1982, 1986, 1993
  5 *	The Regents of the University of California.  All rights reserved.
  6 *
  7 * Redistribution and use in source and binary forms, with or without
  8 * modification, are permitted provided that the following conditions
  9 * are met:
 10 * 1. Redistributions of source code must retain the above copyright
 11 *    notice, this list of conditions and the following disclaimer.
 12 * 2. Redistributions in binary form must reproduce the above copyright
 13 *    notice, this list of conditions and the following disclaimer in the
 14 *    documentation and/or other materials provided with the distribution.
 15 * 3. Neither the name of the University nor the names of its contributors
 16 *    may be used to endorse or promote products derived from this software
 17 *    without specific prior written permission.
 18 *
 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 29 * SUCH DAMAGE.
 30 *
 31 *	@(#)psl.h	8.1 (Berkeley) 6/10/93
 32 */
 33
 34#ifndef PSL_C
 35/*
 36 * MC68000 program status word
 37 */
 38
 39#define	PSL_C		0x0001		/* carry bit */
 40#define	PSL_V		0x0002		/* overflow bit */
 41#define	PSL_Z		0x0004		/* zero bit */
 42#define	PSL_N		0x0008		/* negative bit */
 43#define	PSL_X		0x0010		/* extend bit */
 44#define	PSL_ALLCC	0x001F		/* all cc bits - unlikely */
 45#define	PSL_IPL0	0x0000		/* interrupt priority level 0 */
 46#define	PSL_IPL1	0x0100		/* interrupt priority level 1 */
 47#define	PSL_IPL2	0x0200		/* interrupt priority level 2 */
 48#define	PSL_IPL3	0x0300		/* interrupt priority level 3 */
 49#define	PSL_IPL4	0x0400		/* interrupt priority level 4 */
 50#define	PSL_IPL5	0x0500		/* interrupt priority level 5 */
 51#define	PSL_IPL6	0x0600		/* interrupt priority level 6 */
 52#define	PSL_IPL7	0x0700		/* interrupt priority level 7 */
 53#define	PSL_M		0x1000		/* master (kernel) sp vs intr sp */
 54#define	PSL_S		0x2000		/* supervisor enable bit */
 55/*	PSL_T0		0x4000		   ??? T0 on 68020, 8000 is T1 */
 56#define	PSL_T		0x8000		/* trace enable bit */
 57
 58#define	PSL_LOWIPL	(PSL_S)
 59#define	PSL_HIGHIPL	(PSL_S | PSL_IPL7)
 60#define PSL_IPL		(PSL_IPL7)
 61#define	PSL_USER	(0)
 62
 63#define	PSL_MBZ		0xFFFF58E0	/* must be zero bits */
 64
 65#define	PSL_USERSET	(0)
 66#define	PSL_USERCLR	(PSL_S | PSL_IPL7 | PSL_MBZ)
 67
 68#define	USERMODE(ps)	(((ps) & PSL_S) == 0)
 69
 70#if defined(_KERNEL) && !defined(_LOCORE)
 71
 72#define	IPL_SAFEPRI	PSL_LOWIPL	/* for kern_sleepq.c */
 73
 74/*
 75 * spl functions; platform-specific code must define spl0 and splx().
 76 */
 77
 78static __inline int
 79_spl(int s)
 80{
 81	int sr;
 82
 83	__asm volatile ("movew %%sr,%0; movew %1,%%sr" :
 84	    "=&d" (sr) : "di" (s) : "memory");
 85
 86	return sr;
 87}
 88
 89static __inline int
 90_splraise(int level)
 91{
 92	int sr;
 93
 94	__asm volatile("movw %%sr,%0" : "=d" (sr));
 95
 96	if ((u_int16_t)level >= PSL_HIGHIPL || (u_int16_t)level > (u_int16_t)sr)
 97		__asm volatile("movw %0,%%sr" :: "di" (level) : "memory");
 98
 99	return sr;
100}
101
102/* spl0 may require checking for software interrupts */
103#define	_spl0()		_spl(PSL_S|PSL_IPL0)
104#define	spl1()		_spl(PSL_S|PSL_IPL1)
105#define	spl2()		_spl(PSL_S|PSL_IPL2)
106#define	spl3()		_spl(PSL_S|PSL_IPL3)
107#define	spl4()		_spl(PSL_S|PSL_IPL4)
108#define	spl5()		_spl(PSL_S|PSL_IPL5)
109#define	spl6()		_spl(PSL_S|PSL_IPL6)
110#define	spl7()		_spl(PSL_S|PSL_IPL7)
111
112#define	splraise1()	_splraise(PSL_S|PSL_IPL1)
113#define	splraise2()	_splraise(PSL_S|PSL_IPL2)
114#define	splraise3()	_splraise(PSL_S|PSL_IPL3)
115#define	splraise4()	_splraise(PSL_S|PSL_IPL4)
116#define	splraise5()	_splraise(PSL_S|PSL_IPL5)
117#define	splraise6()	_splraise(PSL_S|PSL_IPL6)
118#define	splraise7()	_splraise(PSL_S|PSL_IPL7)
119
120#endif /* _KERNEL && ! _LOCORE */
121#endif