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psl.h revision 1.8 
      1 /*	$NetBSD: psl.h,v 1.8 2000/12/11 20:05:33 scw 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. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  *
     35  *	@(#)psl.h	8.1 (Berkeley) 6/10/93
     36  */
     37 
     38 #ifndef PSL_C
     39 /*
     40  * MC68000 program status word
     41  */
     42 
     43 #define	PSL_C		0x0001		/* carry bit */
     44 #define	PSL_V		0x0002		/* overflow bit */
     45 #define	PSL_Z		0x0004		/* zero bit */
     46 #define	PSL_N		0x0008		/* negative bit */
     47 #define	PSL_X		0x0010		/* extend bit */
     48 #define	PSL_ALLCC	0x001F		/* all cc bits - unlikely */
     49 #define	PSL_IPL0	0x0000		/* interrupt priority level 0 */
     50 #define	PSL_IPL1	0x0100		/* interrupt priority level 1 */
     51 #define	PSL_IPL2	0x0200		/* interrupt priority level 2 */
     52 #define	PSL_IPL3	0x0300		/* interrupt priority level 3 */
     53 #define	PSL_IPL4	0x0400		/* interrupt priority level 4 */
     54 #define	PSL_IPL5	0x0500		/* interrupt priority level 5 */
     55 #define	PSL_IPL6	0x0600		/* interrupt priority level 6 */
     56 #define	PSL_IPL7	0x0700		/* interrupt priority level 7 */
     57 #define	PSL_M		0x1000		/* master (kernel) sp vs intr sp */
     58 #define	PSL_S		0x2000		/* supervisor enable bit */
     59 /*	PSL_T0		0x4000		   ??? T0 on 68020, 8000 is T1 */
     60 #define	PSL_T		0x8000		/* trace enable bit */
     61 
     62 #define	PSL_LOWIPL	(PSL_S)
     63 #define	PSL_HIGHIPL	(PSL_S | PSL_IPL7)
     64 #define PSL_IPL		(PSL_IPL7)
     65 #define	PSL_USER	(0)
     66 
     67 #define	PSL_MBZ		0xFFFF58E0	/* must be zero bits */
     68 
     69 #define	PSL_USERSET	(0)
     70 #define	PSL_USERCLR	(PSL_S | PSL_IPL7 | PSL_MBZ)
     71 
     72 #define	USERMODE(ps)	(((ps) & PSL_S) == 0)
     73 
     74 #if defined(_KERNEL) && !defined(_LOCORE)
     75 
     76 /*
     77  * spl functions; platform-specific code must define spl0 and splx().
     78  */
     79 
     80 static __inline int
     81 _spl(int s)
     82 {
     83 	int sr;
     84 
     85 	__asm __volatile ("movew %%sr,%0; movew %1,%%sr" :
     86 	    "&=d" (sr) : "di" (s));
     87 
     88 	return sr;
     89 }
     90 
     91 static __inline int
     92 _splraise(int level)
     93 {
     94 	int sr;
     95 
     96 	__asm __volatile("movw %%sr,%0" : "=d" (sr));
     97 
     98 	if ((u_int16_t)level >= PSL_HIGHIPL || (u_int16_t)level > (u_int16_t)sr)
     99 		__asm __volatile("movw %0,%%sr" :: "di" (level));
    100 
    101 	return sr;
    102 }
    103 
    104 /* spl0 may require checking for software interrupts */
    105 #define	_spl0()		_spl(PSL_S|PSL_IPL0)
    106 #define	spl1()		_spl(PSL_S|PSL_IPL1)
    107 #define	spl2()		_spl(PSL_S|PSL_IPL2)
    108 #define	spl3()		_spl(PSL_S|PSL_IPL3)
    109 #define	spl4()		_spl(PSL_S|PSL_IPL4)
    110 #define	spl5()		_spl(PSL_S|PSL_IPL5)
    111 #define	spl6()		_spl(PSL_S|PSL_IPL6)
    112 #define	spl7()		_spl(PSL_S|PSL_IPL7)
    113 
    114 #define	splraise1()	_splraise(PSL_S|PSL_IPL1)
    115 #define	splraise2()	_splraise(PSL_S|PSL_IPL2)
    116 #define	splraise3()	_splraise(PSL_S|PSL_IPL3)
    117 #define	splraise4()	_splraise(PSL_S|PSL_IPL4)
    118 #define	splraise5()	_splraise(PSL_S|PSL_IPL5)
    119 #define	splraise6()	_splraise(PSL_S|PSL_IPL6)
    120 #define	splraise7()	_splraise(PSL_S|PSL_IPL7)
    121 
    122 #endif /* _KERNEL && ! _LOCORE */
    123 #endif
    124