psl.h revision 1.1
1/* $NetBSD: psl.h,v 1.22 1995/10/11 04:20:23 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 flag */ 48#define PSL_PF 0x00000004 /* parity flag */ 49#define PSL_AF 0x00000010 /* auxiliary carry flag */ 50#define PSL_Z 0x00000040 /* zero flag */ 51#define PSL_N 0x00000080 /* sign flag */ 52#define PSL_T 0x00000100 /* trap flag */ 53#define PSL_I 0x00000200 /* interrupt enable flag */ 54#define PSL_D 0x00000400 /* direction flag */ 55#define PSL_V 0x00000800 /* overflow flag */ 56#define PSL_IOPL 0x00003000 /* i/o privilege level */ 57#define PSL_NT 0x00004000 /* nested task */ 58#define PSL_RF 0x00010000 /* resume flag */ 59#define PSL_VM 0x00020000 /* virtual 8086 mode */ 60#define PSL_AC 0x00040000 /* alignment check flag */ 61#define PSL_VIF 0x00080000 /* virtual interrupt enable flag */ 62#define PSL_VIP 0x00100000 /* virtual interrupt pending flag */ 63#define PSL_ID 0x00200000 /* identification flag */ 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#ifdef VM86 70#define PSL_USERSTATIC (PSL_MBO | PSL_MBZ | PSL_I | PSL_IOPL | PSL_VIF | PSL_VIP) 71#else 72#define PSL_USERSTATIC (PSL_MBO | PSL_MBZ | PSL_I | PSL_IOPL | PSL_VM | PSL_VIF | PSL_VIP) 73#endif 74 75#ifdef _KERNEL 76 77/* Interrupt priority `levels'; not mutually exclusive. */ 78#define IPL_NONE -1 79#define IPL_BIO 0 /* block I/O */ 80#define IPL_NET 1 /* network */ 81#define IPL_TTY 2 /* terminal */ 82#define IPL_CLOCK 3 /* clock */ 83#define IPL_IMP 4 /* memory allocation */ 84 85/* Interrupt sharing types. */ 86#define IST_NONE 0 /* none */ 87#define IST_PULSE 1 /* pulsed */ 88#define IST_EDGE 2 /* edge-triggered */ 89#define IST_LEVEL 3 /* level-triggered */ 90 91/* Soft interrupt masks. */ 92#define SIR_CLOCK 31 93#define SIR_CLOCKMASK ((1 << SIR_CLOCK)) 94#define SIR_NET 30 95#define SIR_NETMASK ((1 << SIR_NET) | SIR_CLOCKMASK) 96#define SIR_TTY 29 97#define SIR_TTYMASK ((1 << SIR_TTY) | SIR_CLOCKMASK) 98#define SIR_ALLMASK (SIR_CLOCKMASK | SIR_NETMASK | SIR_TTYMASK) 99 100#ifndef LOCORE 101 102int cpl, ipending, astpending, imask[5]; 103 104/* 105 * Add a mask to cpl, and return the old value of cpl. 106 */ 107static __inline int 108splraise(ncpl) 109 register int ncpl; 110{ 111 register int ocpl = cpl; 112 cpl |= ncpl; 113 return (ocpl); 114} 115 116extern void spllower __P((void)); 117 118/* 119 * Restore a value to cpl (unmasking interrupts). If any unmasked 120 * interrupts are pending, call spllower() to process them. 121 * 122 * NOTE: We go to the trouble of returning the old value of cpl for 123 * the benefit of some splsoftclock() callers. This extra work is 124 * usually optimized away by the compiler. 125 */ 126static __inline int 127splx(ncpl) 128 register int ncpl; 129{ 130 register int ocpl = cpl; 131 cpl = ncpl; 132 if (ipending & ~ncpl) 133 spllower(); 134 return (ocpl); 135} 136 137/* 138 * Hardware interrupt masks 139 */ 140#define splbio() splraise(imask[IPL_BIO]) 141#define splnet() splraise(imask[IPL_NET]) 142#define spltty() splraise(imask[IPL_TTY]) 143#define splclock() splraise(imask[IPL_CLOCK]) 144#define splimp() splraise(imask[IPL_IMP]) 145#define splstatclock() splclock() 146 147/* 148 * Software interrupt masks 149 * 150 * NOTE: splsoftclock() is used by hardclock() to lower the priority from 151 * clock to softclock before it calls softclock(). 152 */ 153#define splsoftclock() splx(SIR_CLOCKMASK) 154#define splsoftnet() splraise(SIR_NETMASK) 155#define splsofttty() splraise(SIR_TTYMASK) 156 157/* 158 * Miscellaneous 159 */ 160#define splhigh() splraise(-1) 161#define spl0() splx(0) 162 163/* 164 * Software interrupt registration 165 */ 166#define softintr(n) (ipending |= (1 << (n))) 167#define setsoftast() (astpending = 1) 168#define setsoftclock() softintr(SIR_CLOCK) 169#define setsoftnet() softintr(SIR_NET) 170#define setsofttty() softintr(SIR_TTY) 171 172#endif /* !LOCORE */ 173#endif /* _KERNEL */ 174 175#endif /* !_I386_PSL_H_ */ 176