1 /* $NetBSD: psl.h,v 1.14 1994/11/06 01:37:47 mycroft Exp $ */ 2 3 /*- 4 * Copyright (c) 1990 The Regents of the University of California. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * William Jolitz. 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 University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)psl.h 5.2 (Berkeley) 1/18/91 39 */ 40 41 #ifndef _I386_PSL_H_ 42 #define _I386_PSL_H_ 43 44 /* 45 * 386 processor status longword. 46 */ 47 #define PSL_C 0x00000001 /* carry bit */ 48 #define PSL_PF 0x00000004 /* parity bit */ 49 #define PSL_AF 0x00000010 /* bcd carry bit */ 50 #define PSL_Z 0x00000040 /* zero bit */ 51 #define PSL_N 0x00000080 /* negative bit */ 52 #define PSL_T 0x00000100 /* trace enable bit */ 53 #define PSL_I 0x00000200 /* interrupt enable bit */ 54 #define PSL_D 0x00000400 /* string instruction direction bit */ 55 #define PSL_V 0x00000800 /* overflow bit */ 56 #define PSL_IOPL 0x00003000 /* i/o priviledge level enable */ 57 #define PSL_NT 0x00004000 /* nested task bit */ 58 #define PSL_RF 0x00010000 /* restart flag bit */ 59 #define PSL_VM 0x00020000 /* virtual 8086 mode bit */ 60 #define PSL_AC 0x00040000 /* alignment checking */ 61 #define PSL_VIF 0x00080000 /* virtual interrupt enable */ 62 #define PSL_VIP 0x00100000 /* virtual interrupt pending */ 63 #define PSL_ID 0x00200000 /* identification bit */ 64 65 #define PSL_MBO 0x00000002 /* must be one bits */ 66 #define PSL_MBZ 0xffc08028 /* must be zero bits */ 67 68 #define PSL_USERSET (PSL_MBO | PSL_I) 69 #define PSL_USERCLR (PSL_MBZ | PSL_VIP | PSL_VIF | PSL_NT | PSL_VM) 70 71 #ifdef KERNEL 72 73 #define IPL_NONE -1 74 #define IPL_BIO 0 75 #define IPL_NET 1 76 #define IPL_TTY 2 77 #define IPL_CLOCK 3 78 79 #define SIR_CLOCK 31 80 #define SIR_CLOCKMASK ((1 << SIR_CLOCK)) 81 #define SIR_NET 30 82 #define SIR_NETMASK ((1 << SIR_NET) | SIR_CLOCKMASK) 83 #define SIR_TTY 29 84 #define SIR_TTYMASK ((1 << SIR_TTY) | SIR_CLOCKMASK) 85 86 #ifndef LOCORE 87 88 int cpl, ipending, astpending, imask[4]; 89 90 /* 91 * Add a mask to cpl, and return the old value of cpl. 92 */ 93 static __inline int 94 splraise(ncpl) 95 register int ncpl; 96 { 97 register int ocpl = cpl; 98 cpl |= ncpl; 99 return (ocpl); 100 } 101 102 extern void spllower __P((void)); 103 104 /* 105 * Restore a value to cpl (unmasking interrupts). If any unmasked 106 * interrupts are pending, call spllower() to process them. 107 * 108 * NOTE: We go to the trouble of returning the old value of cpl for 109 * the benefit of some splsoftclock() callers. This extra work is 110 * usually optimized away by the compiler. 111 */ 112 static __inline int 113 splx(ncpl) 114 register int ncpl; 115 { 116 register int ocpl = cpl; 117 cpl = ncpl; 118 if (ipending & ~ncpl) 119 spllower(); 120 return (ocpl); 121 } 122 123 /* 124 * Hardware interrupt masks 125 */ 126 #define splbio() splraise(imask[IPL_BIO]) 127 #define splimp() splraise(imask[IPL_NET]) 128 #define spltty() splraise(imask[IPL_TTY]) 129 #define splclock() splraise(imask[IPL_CLOCK]) 130 #define splstatclock() splclock() 131 132 /* 133 * Software interrupt masks 134 * 135 * NOTE: splsoftclock() is used by hardclock() to lower the priority from 136 * clock to softclock before it calls softclock(). 137 */ 138 #define splsoftclock() splx(SIR_CLOCKMASK) 139 #define splsoftnet() splraise(SIR_NETMASK) 140 #define splnet() splsoftnet() 141 #define splsofttty() splraise(SIR_TTYMASK) 142 143 /* 144 * Miscellaneous 145 */ 146 #define splhigh() splraise(-1) 147 #define spl0() splx(0) 148 149 /* 150 * Software interrupt registration 151 */ 152 #define softintr(n) (ipending |= (1 << (n))) 153 #define setsoftast() (astpending = 1) 154 #define setsoftclock() softintr(SIR_CLOCK) 155 #define setsoftnet() softintr(SIR_NET) 156 #define setsofttty() softintr(SIR_TTY) 157 158 #endif /* !LOCORE */ 159 #endif /* KERNEL */ 160 161 #endif /* !_I386_PSL_H_ */ 162