psl.h revision 1.14
1 /* $NetBSD: psl.h,v 1.14 1998/02/06 00:02:30 mrg 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 #if defined(_KERNEL) && !defined(_LOCORE) 79 80 static __inline int getpsr __P((void)); 81 static __inline void setpsr __P((int)); 82 static __inline int spl0 __P((void)); 83 static __inline int splhigh __P((void)); 84 static __inline void splx __P((int)); 85 static __inline int getmid __P((void)); 86 87 /* 88 * GCC pseudo-functions for manipulating PSR (primarily PIL field). 89 */ 90 static __inline int getpsr() 91 { 92 int psr; 93 94 __asm __volatile("rd %%psr,%0" : "=r" (psr)); 95 return (psr); 96 } 97 98 static __inline int getmid() 99 { 100 int mid; 101 102 __asm __volatile("rd %%tbr,%0" : "=r" (mid)); 103 return ((mid >> 20) & 0x3); 104 } 105 106 static __inline void setpsr(newpsr) 107 int newpsr; 108 { 109 __asm __volatile("wr %0,0,%%psr" : : "r" (newpsr)); 110 __asm __volatile("nop"); 111 __asm __volatile("nop"); 112 __asm __volatile("nop"); 113 } 114 115 static __inline int spl0() 116 { 117 int psr, oldipl; 118 119 /* 120 * wrpsr xors two values: we choose old psr and old ipl here, 121 * which gives us the same value as the old psr but with all 122 * the old PIL bits turned off. 123 */ 124 __asm __volatile("rd %%psr,%0" : "=r" (psr)); 125 oldipl = psr & PSR_PIL; 126 __asm __volatile("wr %0,%1,%%psr" : : "r" (psr), "r" (oldipl)); 127 128 /* 129 * Three instructions must execute before we can depend 130 * on the bits to be changed. 131 */ 132 __asm __volatile("nop; nop; nop"); 133 return (oldipl); 134 } 135 136 /* 137 * PIL 1 through 14 can use this macro. 138 * (spl0 and splhigh are special since they put all 0s or all 1s 139 * into the ipl field.) 140 */ 141 #define SPL(name, newipl) \ 142 static __inline int name __P((void)); \ 143 static __inline int name() \ 144 { \ 145 int psr, oldipl; \ 146 __asm __volatile("rd %%psr,%0" : "=r" (psr)); \ 147 oldipl = psr & PSR_PIL; \ 148 psr &= ~oldipl; \ 149 __asm __volatile("wr %0,%1,%%psr" : : \ 150 "r" (psr), "n" ((newipl) << 8)); \ 151 __asm __volatile("nop; nop; nop"); \ 152 return (oldipl); \ 153 } 154 /* A non-priority-decreasing version of SPL */ 155 #define _SPLRAISE(name, newipl) \ 156 static __inline int name __P((void)); \ 157 static __inline int name() \ 158 { \ 159 int psr, oldipl; \ 160 __asm __volatile("rd %%psr,%0" : "=r" (psr)); \ 161 oldipl = psr & PSR_PIL; \ 162 if ((newipl << 8) <= oldipl) \ 163 return oldipl; \ 164 psr &= ~oldipl; \ 165 __asm __volatile("wr %0,%1,%%psr" : : \ 166 "r" (psr), "n" ((newipl) << 8)); \ 167 __asm __volatile("nop; nop; nop"); \ 168 return (oldipl); \ 169 } 170 171 SPL(splsoftint, 1) 172 #define splsoftclock splsoftint 173 #define splsoftnet splsoftint 174 175 /* audio software interrupts are at software level 4 */ 176 #define PIL_AUSOFT 4 177 SPL(splausoft, PIL_AUSOFT) 178 179 /* floppy software interrupts are at software level 4 too */ 180 #define PIL_FDSOFT 4 181 SPL(splfdsoft, PIL_FDSOFT) 182 183 /* Block devices */ 184 SPL(splbio, 5) 185 186 /* network hardware interrupts are at level 6 */ 187 #define PIL_NET 6 188 SPL(splnet, PIL_NET) 189 190 /* tty input runs at software level 6 */ 191 #define PIL_TTY 6 192 SPL(spltty, PIL_TTY) 193 194 /* 195 * Memory allocation (must be as high as highest network, tty, or disk device) 196 */ 197 SPL(splimp, 7) 198 SPL(splpmap, 7) 199 200 /* clock interrupts at level 10 */ 201 #define PIL_CLOCK 10 202 SPL(splclock, PIL_CLOCK) 203 204 /* fd hardware interrupts are at level 11 */ 205 SPL(splfd, 11) 206 207 /* zs hardware interrupts are at level 12 */ 208 SPL(splzs, 12) 209 210 /* audio hardware interrupts are at level 13 */ 211 SPL(splaudio, 13) 212 213 /* second sparc timer interrupts at level 14 */ 214 SPL(splstatclock, 14) 215 216 static __inline int splhigh() 217 { 218 int psr, oldipl; 219 220 __asm __volatile("rd %%psr,%0" : "=r" (psr)); 221 __asm __volatile("wr %0,0,%%psr" : : "r" (psr | PSR_PIL)); 222 __asm __volatile("and %1,%2,%0; nop; nop" : "=r" (oldipl) : \ 223 "r" (psr), "n" (PSR_PIL)); 224 return (oldipl); 225 } 226 227 /* splx does not have a return value */ 228 static __inline void splx(newipl) 229 int newipl; 230 { 231 int psr; 232 233 __asm __volatile("rd %%psr,%0" : "=r" (psr)); 234 __asm __volatile("wr %0,%1,%%psr" : : \ 235 "r" (psr & ~PSR_PIL), "rn" (newipl)); 236 __asm __volatile("nop; nop; nop"); 237 } 238 #endif /* KERNEL && !_LOCORE */ 239 240 #endif /* PSR_IMPL */ 241
Indexes created Tue Sep 23 14:10:03 GMT 2025