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psl.h revision 1.14 
      1 /*	$NetBSD: psl.h,v 1.14 1998/11/24 17:07:54 kleink Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1996 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Gordon W. Ross.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 #ifndef	PSL_C
     40 #include <m68k/psl.h>
     41 
     42 /* Could define this in the common <m68k/psl.h> instead. */
     43 
     44 #if defined(_KERNEL) && !defined(_LOCORE)
     45 
     46 #ifndef __GNUC__
     47 /* No inline, use the real functions in locore.s */
     48 extern int _getsr __P((void));
     49 extern int _spl __P((int new));
     50 extern int _splraise __P((int new));
     51 #else	/* GNUC */
     52 /*
     53  * Define inline functions for PSL manipulation.
     54  * These are as close to macros as one can get.
     55  * When not optimizing gcc will call the locore.s
     56  * functions by the same names, so breakpoints on
     57  * these functions will work normally, etc.
     58  * (See the GCC extensions info document.)
     59  */
     60 
     61 static __inline int _getsr __P((void));
     62 static __inline int _spl __P((int));
     63 static __inline int _splraise __P((int));
     64 
     65 /* Get current sr value. */
     66 static __inline int
     67 _getsr(void)
     68 {
     69 	register int rv;
     70 
     71 	__asm __volatile ("clrl %0; movew sr,%0" : "&=d" (rv));
     72 	return (rv);
     73 }
     74 
     75 /* Set the current sr and return the old value. */
     76 static __inline int
     77 _spl(int new)
     78 {
     79 	register int old;
     80 
     81 	__asm __volatile (
     82 		"clrl %0; movew sr,%0; movew %1,sr" :
     83 			"&=d" (old) : "di" (new));
     84 	return (old);
     85 }
     86 
     87 /*
     88  * Like _spl() but can be used in places where the
     89  * interrupt priority may already have been raised,
     90  * without risk of enabling interrupts by accident.
     91  * The comparison includes the "S" bit (always on)
     92  * because that generates more efficient code.
     93  */
     94 static __inline int
     95 _splraise(int new)
     96 {
     97 	register int old;
     98 
     99 	__asm __volatile ("clrl %0; movew sr,%0" : "&=d" (old));
    100 	if ((old & PSL_HIGHIPL) < new) {
    101 		__asm __volatile ("movew %0,sr;" : : "di" (new));
    102 	}
    103 	return (old);
    104 }
    105 #endif	/* GNUC */
    106 
    107 /*
    108  * The rest of this is sun3 specific, because other ports may
    109  * need to do special things in spl0() (i.e. simulate SIR).
    110  * Suns have a REAL interrupt register, so spl0() and splx(s)
    111  * have no need to check for any simulated interrupts, etc.
    112  */
    113 
    114 #define spl0()  _spl(PSL_S|PSL_IPL0)
    115 #define spl1()  _spl(PSL_S|PSL_IPL1)
    116 #define spl2()  _spl(PSL_S|PSL_IPL2)
    117 #define spl3()  _spl(PSL_S|PSL_IPL3)
    118 #define spl4()  _spl(PSL_S|PSL_IPL4)
    119 #define spl5()  _spl(PSL_S|PSL_IPL5)
    120 #define spl6()  _spl(PSL_S|PSL_IPL6)
    121 #define spl7()  _spl(PSL_S|PSL_IPL7)
    122 #define splx(x)	_spl(x)
    123 
    124 /* IPL used by soft interrupts: netintr(), softclock() */
    125 #define splsoftclock()  spl1()
    126 #define splsoftnet()    spl1()
    127 
    128 /* Highest block device (strategy) IPL. */
    129 #define splbio()        spl2()
    130 
    131 /* Highest network interface IPL. */
    132 #define splnet()        spl3()
    133 
    134 /* Highest tty device IPL. */
    135 #define spltty()        spl4()
    136 
    137 /*
    138  * Requirement: imp >= (highest network, tty, or disk IPL)
    139  * This is used mostly in the VM code. (Why not splvm?)
    140  * Note that the VM code runs at spl7 during kernel
    141  * initialization, and later at spl0, so we have to
    142  * use splraise to avoid enabling interrupts early.
    143  */
    144 #define splimp()        _splraise(PSL_S|PSL_IPL4)
    145 
    146 /* Intersil clock hardware interrupts (hard-wired at 5) */
    147 #define splclock()      spl5()
    148 #define splstatclock()  splclock()
    149 
    150 /* Block out all interrupts (except NMI of course). */
    151 #define splhigh()       spl7()
    152 #define splsched()      spl7()
    153 
    154 #endif	/* KERNEL && !_LOCORE */
    155 #endif	/* PSL_C */
    156