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psl.h revision 1.1 
      1 /*	$NetBSD: psl.h,v 1.1 2001/04/06 13:13:04 fredette 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 _SUN2_PSL_H_
     40 #define	_SUN2_PSL_H_
     41 
     42 #include <m68k/psl.h>
     43 
     44 /* Could define this in the common <m68k/psl.h> instead. */
     45 
     46 #if defined(_KERNEL) && !defined(_LOCORE)
     47 
     48 /*
     49  * Define inline functions for PSL manipulation.
     50  * These are as close to macros as one can get.
     51  * When not optimizing gcc will call the locore.s
     52  * functions by the same names, so breakpoints on
     53  * these functions will work normally, etc.
     54  * (See the GCC extensions info document.)
     55  */
     56 
     57 static __inline int _getsr __P((void));
     58 
     59 /* Get current sr value. */
     60 static __inline int
     61 _getsr(void)
     62 {
     63 	register int rv;
     64 
     65 	__asm __volatile ("clrl %0; movew %%sr,%0" : "&=d" (rv));
     66 	return (rv);
     67 }
     68 
     69 /*
     70  * The rest of this is sun2 specific, because other ports may
     71  * need to do special things in spl0() (i.e. simulate SIR).
     72  * Suns have a REAL interrupt register, so spl0() and splx(s)
     73  * have no need to check for any simulated interrupts, etc.
     74  */
     75 
     76 #define spl0()  _spl0()		/* we have real software interrupts */
     77 #define splx(x)	_spl(x)
     78 
     79 /* IPL used by soft interrupts: netintr(), softclock() */
     80 #define	spllowersoftclock() spl1()
     81 #define splsoftclock()  splraise1()
     82 #define splsoftnet()    splraise1()
     83 
     84 /* Highest block device (strategy) IPL. */
     85 #define splbio()        splraise2()
     86 
     87 /* Highest network interface IPL. */
     88 #define splnet()        splraise3()
     89 
     90 /* Highest tty device IPL. */
     91 #define spltty()        splraise4()
     92 
     93 /*
     94  * Requirement: imp >= (highest network, tty, or disk IPL)
     95  * This is used mostly in the VM code.
     96  * Note that the VM code runs at spl7 during kernel
     97  * initialization, and later at spl0, so we have to
     98  * use splraise to avoid enabling interrupts early.
     99  */
    100 #define splimp()        _splraise(PSL_S|PSL_IPL4)
    101 #define splvm()         _splraise(PSL_S|PSL_IPL4)
    102 
    103 /* Intersil clock hardware interrupts (hard-wired at 5) */
    104 #define splclock()      splraise5()
    105 #define splstatclock()  splclock()
    106 
    107 /* Block out all interrupts (except NMI of course). */
    108 #define splhigh()       spl7()
    109 #define splsched()      spl7()
    110 #define spllock()	spl7()
    111 
    112 /* This returns true iff the spl given is spl0. */
    113 #define	is_spl0(s)	(((s) & PSL_IPL7) == 0)
    114 
    115 #endif	/* KERNEL && !_LOCORE */
    116 #endif /* _SUN2_PSL_H_ */
    117