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psl.h revision 1.14 
      1 /*	$NetBSD: psl.h,v 1.14 2009/05/06 21:37:40 mhitch 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 /*
     73  * spl functions; platform-specific code must define spl0 and splx().
     74  */
     75 
     76 static __inline int
     77 _spl(int s)
     78 {
     79 	int sr;
     80 
     81 	__asm volatile ("movew %%sr,%0; movew %1,%%sr" :
     82 	    "=&d" (sr) : "di" (s) : "memory");
     83 
     84 	return sr;
     85 }
     86 
     87 static __inline int
     88 _splraise(int level)
     89 {
     90 	int sr;
     91 
     92 	__asm volatile("movw %%sr,%0" : "=d" (sr));
     93 
     94 	if ((u_int16_t)level >= PSL_HIGHIPL || (u_int16_t)level > (u_int16_t)sr)
     95 		__asm volatile("movw %0,%%sr" :: "di" (level) : "memory");
     96 
     97 	return sr;
     98 }
     99 
    100 /* spl0 may require checking for software interrupts */
    101 #define	_spl0()		_spl(PSL_S|PSL_IPL0)
    102 #define	spl1()		_spl(PSL_S|PSL_IPL1)
    103 #define	spl2()		_spl(PSL_S|PSL_IPL2)
    104 #define	spl3()		_spl(PSL_S|PSL_IPL3)
    105 #define	spl4()		_spl(PSL_S|PSL_IPL4)
    106 #define	spl5()		_spl(PSL_S|PSL_IPL5)
    107 #define	spl6()		_spl(PSL_S|PSL_IPL6)
    108 #define	spl7()		_spl(PSL_S|PSL_IPL7)
    109 
    110 #define	splraise1()	_splraise(PSL_S|PSL_IPL1)
    111 #define	splraise2()	_splraise(PSL_S|PSL_IPL2)
    112 #define	splraise3()	_splraise(PSL_S|PSL_IPL3)
    113 #define	splraise4()	_splraise(PSL_S|PSL_IPL4)
    114 #define	splraise5()	_splraise(PSL_S|PSL_IPL5)
    115 #define	splraise6()	_splraise(PSL_S|PSL_IPL6)
    116 #define	splraise7()	_splraise(PSL_S|PSL_IPL7)
    117 
    118 #endif /* _KERNEL && ! _LOCORE */
    119 #endif
    120