1 /* $NetBSD: psl.h,v 1.13 1997/05/29 21:16:59 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 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 /* Get current sr value. */ 62 extern __inline__ int 63 _getsr(void) 64 { 65 register int rv; 66 67 __asm __volatile ("clrl %0; movew sr,%0" : "&=d" (rv)); 68 return (rv); 69 } 70 71 /* Set the current sr and return the old value. */ 72 extern __inline__ int 73 _spl(int new) 74 { 75 register int old; 76 77 __asm __volatile ( 78 "clrl %0; movew sr,%0; movew %1,sr" : 79 "&=d" (old) : "di" (new)); 80 return (old); 81 } 82 83 /* 84 * Like _spl() but can be used in places where the 85 * interrupt priority may already have been raised, 86 * without risk of enabling interrupts by accident. 87 * The comparison includes the "S" bit (always on) 88 * because that generates more efficient code. 89 */ 90 extern __inline__ int 91 _splraise(int new) 92 { 93 register int old; 94 95 __asm __volatile ("clrl %0; movew sr,%0" : "&=d" (old)); 96 if ((old & PSL_HIGHIPL) < new) { 97 __asm __volatile ("movew %0,sr;" : : "di" (new)); 98 } 99 return (old); 100 } 101 #endif /* GNUC */ 102 103 /* 104 * The rest of this is sun3 specific, because other ports may 105 * need to do special things in spl0() (i.e. simulate SIR). 106 * Suns have a REAL interrupt register, so spl0() and splx(s) 107 * have no need to check for any simulated interrupts, etc. 108 */ 109 110 #define spl0() _spl(PSL_S|PSL_IPL0) 111 #define spl1() _spl(PSL_S|PSL_IPL1) 112 #define spl2() _spl(PSL_S|PSL_IPL2) 113 #define spl3() _spl(PSL_S|PSL_IPL3) 114 #define spl4() _spl(PSL_S|PSL_IPL4) 115 #define spl5() _spl(PSL_S|PSL_IPL5) 116 #define spl6() _spl(PSL_S|PSL_IPL6) 117 #define spl7() _spl(PSL_S|PSL_IPL7) 118 #define splx(x) _spl(x) 119 120 /* IPL used by soft interrupts: netintr(), softclock() */ 121 #define splsoftclock() spl1() 122 #define splsoftnet() spl1() 123 124 /* Highest block device (strategy) IPL. */ 125 #define splbio() spl2() 126 127 /* Highest network interface IPL. */ 128 #define splnet() spl3() 129 130 /* Highest tty device IPL. */ 131 #define spltty() spl4() 132 133 /* 134 * Requirement: imp >= (highest network, tty, or disk IPL) 135 * This is used mostly in the VM code. (Why not splvm?) 136 * Note that the VM code runs at spl7 during kernel 137 * initialization, and later at spl0, so we have to 138 * use splraise to avoid enabling interrupts early. 139 */ 140 #define splimp() _splraise(PSL_S|PSL_IPL4) 141 142 /* Intersil clock hardware interrupts (hard-wired at 5) */ 143 #define splclock() spl5() 144 #define splstatclock() splclock() 145 146 /* Block out all interrupts (except NMI of course). */ 147 #define splhigh() spl7() 148 #define splsched() spl7() 149 150 #endif /* KERNEL && !_LOCORE */ 151 #endif /* PSL_C */ 152