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psl.h revision 1.12 
      1 /*	$NetBSD: psl.h,v 1.12 1997/01/27 19:41:07 gwr 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 real function in locore.s */
     48 extern int _spl(int new);
     49 #else	/* GNUC */
     50 /*
     51  * Define an inline function for PSL manipulation.
     52  * This is as close to a macro as one can get.
     53  * If not optimizing, the one in locore.s is used.
     54  * (See the GCC extensions info document.)
     55  */
     56 extern __inline__ int _spl(int new)
     57 {
     58 	register int old;
     59 
     60 	__asm __volatile (
     61 		"clrl %0; movew sr,%0; movew %1,sr" :
     62 			"&=d" (old) : "di" (new));
     63 	return (old);
     64 }
     65 #endif	/* GNUC */
     66 
     67 /*
     68  * The rest of this is sun3 specific, because other ports may
     69  * need to do special things in spl0() (i.e. simulate SIR).
     70  * Suns have a REAL interrupt register, so spl0() and splx(s)
     71  * have no need to check for any simulated interrupts, etc.
     72  */
     73 
     74 #define spl0()  _spl(PSL_S|PSL_IPL0)
     75 #define spl1()  _spl(PSL_S|PSL_IPL1)
     76 #define spl2()  _spl(PSL_S|PSL_IPL2)
     77 #define spl3()  _spl(PSL_S|PSL_IPL3)
     78 #define spl4()  _spl(PSL_S|PSL_IPL4)
     79 #define spl5()  _spl(PSL_S|PSL_IPL5)
     80 #define spl6()  _spl(PSL_S|PSL_IPL6)
     81 #define spl7()  _spl(PSL_S|PSL_IPL7)
     82 #define splx(x)	_spl(x)
     83 
     84 /* IPL used by soft interrupts: netintr(), softclock() */
     85 #define splsoftclock()  spl1()
     86 #define splsoftnet()    spl1()
     87 
     88 /* Highest block device (strategy) IPL. */
     89 #define splbio()        spl2()
     90 
     91 /* Highest network interface IPL. */
     92 #define splnet()        spl3()
     93 
     94 /* Highest tty device IPL. */
     95 #define spltty()        spl4()
     96 
     97 /* Requirement: imp >= (highest network, tty, or disk IPL) */
     98 #define splimp()        spl4()
     99 
    100 /* Intersil clock hardware interrupts (hard-wired at 5) */
    101 #define splclock()      spl5()
    102 #define splstatclock()  splclock()
    103 
    104 /* Block out all interrupts (except NMI of course). */
    105 #define splhigh()       spl7()
    106 #define splsched()      spl7()
    107 
    108 /* Get current sr value (debug, etc.) */
    109 extern int getsr __P((void));
    110 
    111 #endif	/* KERNEL && !_LOCORE */
    112 #endif	/* PSL_C */
    113