psl.h revision 1.4
1 /* $NetBSD: psl.h,v 1.4 1994/11/20 20:53:25 deraadt Exp $ */ 2 3 /* 4 * Copyright (c) 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This software was developed by the Computer Systems Engineering group 8 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 9 * contributed to Berkeley. 10 * 11 * All advertising materials mentioning features or use of this software 12 * must display the following acknowledgement: 13 * This product includes software developed by the University of 14 * California, Lawrence Berkeley Laboratory. 15 * 16 * Redistribution and use in source and binary forms, with or without 17 * modification, are permitted provided that the following conditions 18 * are met: 19 * 1. Redistributions of source code must retain the above copyright 20 * notice, this list of conditions and the following disclaimer. 21 * 2. Redistributions in binary form must reproduce the above copyright 22 * notice, this list of conditions and the following disclaimer in the 23 * documentation and/or other materials provided with the distribution. 24 * 3. All advertising materials mentioning features or use of this software 25 * must display the following acknowledgement: 26 * This product includes software developed by the University of 27 * California, Berkeley and its contributors. 28 * 4. Neither the name of the University nor the names of its contributors 29 * may be used to endorse or promote products derived from this software 30 * without specific prior written permission. 31 * 32 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 33 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 34 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 35 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 36 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 37 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 38 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 39 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 40 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 41 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 42 * SUCH DAMAGE. 43 * 44 * @(#)psl.h 8.1 (Berkeley) 6/11/93 45 */ 46 47 #ifndef PSR_IMPL 48 49 /* 50 * SPARC Process Status Register (in psl.h for hysterical raisins). 51 * 52 * The picture in the Sun manuals looks like this: 53 * 1 1 54 * 31 28 27 24 23 20 19 14 3 2 11 8 7 6 5 4 0 55 * +-------+-------+-------+-----------+-+-+-------+-+-+-+---------+ 56 * | impl | ver | icc | reserved |E|E| pil |S|P|E| CWP | 57 * | | |n z v c| |C|F| | |S|T| | 58 * +-------+-------+-------+-----------+-+-+-------+-+-+-+---------+ 59 */ 60 61 #define PSR_IMPL 0xf0000000 /* implementation */ 62 #define PSR_VER 0x0f000000 /* version */ 63 #define PSR_ICC 0x00f00000 /* integer condition codes */ 64 #define PSR_N 0x00800000 /* negative */ 65 #define PSR_Z 0x00400000 /* zero */ 66 #define PSR_O 0x00200000 /* overflow */ 67 #define PSR_C 0x00100000 /* carry */ 68 #define PSR_EC 0x00002000 /* coprocessor enable */ 69 #define PSR_EF 0x00001000 /* FP enable */ 70 #define PSR_PIL 0x00000f00 /* interrupt level */ 71 #define PSR_S 0x00000080 /* supervisor (kernel) mode */ 72 #define PSR_PS 0x00000040 /* previous supervisor mode (traps) */ 73 #define PSR_ET 0x00000020 /* trap enable */ 74 #define PSR_CWP 0x0000001f /* current window pointer */ 75 76 #define PSR_BITS "\20\16EC\15EF\10S\7PS\6ET" 77 78 #define PIL_CLOCK 10 79 80 #if defined(KERNEL) && !defined(LOCORE) 81 /* 82 * GCC pseudo-functions for manipulating PSR (primarily PIL field). 83 */ 84 static __inline int getpsr() { 85 int psr; 86 87 __asm __volatile("rd %%psr,%0" : "=r" (psr)); 88 return (psr); 89 } 90 91 static __inline void setpsr(int newpsr) { 92 __asm __volatile("wr %0,0,%%psr" : : "r" (newpsr)); 93 __asm __volatile("nop"); 94 __asm __volatile("nop"); 95 __asm __volatile("nop"); 96 } 97 98 static __inline int spl0() { 99 int psr, oldipl; 100 101 /* 102 * wrpsr xors two values: we choose old psr and old ipl here, 103 * which gives us the same value as the old psr but with all 104 * the old PIL bits turned off. 105 */ 106 __asm __volatile("rd %%psr,%0" : "=r" (psr)); 107 oldipl = psr & PSR_PIL; 108 __asm __volatile("wr %0,%1,%%psr" : : "r" (psr), "r" (oldipl)); 109 110 /* 111 * Three instructions must execute before we can depend 112 * on the bits to be changed. 113 */ 114 __asm __volatile("nop; nop; nop"); 115 return (oldipl); 116 } 117 118 /* 119 * PIL 1 through 14 can use this macro. 120 * (spl0 and splhigh are special since they put all 0s or all 1s 121 * into the ipl field.) 122 */ 123 #define SPL(name, newipl) \ 124 static __inline int name() { \ 125 int psr, oldipl; \ 126 __asm __volatile("rd %%psr,%0" : "=r" (psr)); \ 127 oldipl = psr & PSR_PIL; \ 128 psr &= ~oldipl; \ 129 __asm __volatile("wr %0,%1,%%psr" : : \ 130 "r" (psr), "n" ((newipl) << 8)); \ 131 __asm __volatile("nop; nop; nop"); \ 132 return (oldipl); \ 133 } 134 135 SPL(splsoftint, 1) 136 #define splnet splsoftint 137 #define splsoftclock splsoftint 138 139 /* tty input runs at software level 6 */ 140 #define PIL_TTY 6 141 SPL(spltty, PIL_TTY) 142 143 /* Memory allocation (must be as high as highest network or tty device) */ 144 SPL(splimp, 7) 145 146 /* audio software interrupts are at software level 4 */ 147 #define PIL_AUSOFT 4 148 SPL(splausoft, PIL_AUSOFT) 149 150 SPL(splbio, 9) 151 152 SPL(splclock, PIL_CLOCK) 153 154 /* zs hardware interrupts are at level 12 */ 155 SPL(splzs, 12) 156 157 /* audio hardware interrupts are at level 13 */ 158 SPL(splaudio, 13) 159 160 /* second sparc timer interrupts at level 14 */ 161 SPL(splstatclock, 14) 162 163 static __inline int splhigh() { 164 int psr, oldipl; 165 166 __asm __volatile("rd %%psr,%0" : "=r" (psr)); 167 __asm __volatile("wr %0,0,%%psr" : : "r" (psr | PSR_PIL)); 168 __asm __volatile("and %1,%2,%0; nop; nop" : "=r" (oldipl) : \ 169 "r" (psr), "n" (PSR_PIL)); 170 return (oldipl); 171 } 172 173 /* splx does not have a return value */ 174 static __inline void splx(int newipl) { 175 int psr; 176 177 __asm __volatile("rd %%psr,%0" : "=r" (psr)); 178 __asm __volatile("wr %0,%1,%%psr" : : \ 179 "r" (psr & ~PSR_PIL), "rn" (newipl)); 180 __asm __volatile("nop; nop; nop"); 181 } 182 #endif /* KERNEL && !LOCORE */ 183 184 #endif /* PSR_IMPL */ 185
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