psl.h revision 1.5
1/* $NetBSD: psl.h,v 1.27 1996/02/01 22:30:56 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 102volatile int cpl, ipending, astpending; 103int imask[5]; 104 105extern void Xspllower __P((void)); 106 107/* 108 * Add a mask to cpl, and return the old value of cpl. 109 */ 110static __inline int 111splraise(ncpl) 112 register int ncpl; 113{ 114 register int ocpl = cpl; 115 116 cpl = ocpl | ncpl; 117 return (ocpl); 118} 119 120/* 121 * Restore a value to cpl (unmasking interrupts). If any unmasked 122 * interrupts are pending, call Xspllower() to process them. 123 */ 124static __inline void 125splx(ncpl) 126 register int ncpl; 127{ 128 129 cpl = ncpl; 130 if (ipending & ~ncpl) 131 Xspllower(); 132} 133 134/* 135 * Same as splx(), but we return the old value of spl, for the 136 * benefit of some splsoftclock() callers. 137 */ 138static __inline int 139spllower(ncpl) 140 register int ncpl; 141{ 142 register int ocpl = cpl; 143 144 cpl = ncpl; 145 if (ipending & ~ncpl) 146 Xspllower(); 147 return (ocpl); 148} 149 150/* 151 * Hardware interrupt masks 152 */ 153#define splbio() splraise(imask[IPL_BIO]) 154#define splnet() splraise(imask[IPL_NET]) 155#define spltty() splraise(imask[IPL_TTY]) 156#define splclock() splraise(imask[IPL_CLOCK]) 157#define splimp() splraise(imask[IPL_IMP]) 158#define splstatclock() splclock() 159 160/* 161 * Software interrupt masks 162 * 163 * NOTE: splsoftclock() is used by hardclock() to lower the priority from 164 * clock to softclock before it calls softclock(). 165 */ 166#define splsoftclock() spllower(SIR_CLOCKMASK) 167#define splsoftnet() splraise(SIR_NETMASK) 168#define splsofttty() splraise(SIR_TTYMASK) 169 170/* 171 * Miscellaneous 172 */ 173#define splhigh() splraise(-1) 174#define spl0() spllower(0) 175 176/* 177 * Software interrupt registration 178 * 179 * We hand-code this to ensure that it's atomic. 180 */ 181static __inline void 182softintr(mask) 183 register int mask; 184{ 185 186 __asm __volatile("orl %0,_ipending" : : "ir" (mask)); 187} 188 189#define setsoftast() (astpending = 1) 190#define setsoftclock() softintr(1 << SIR_CLOCK) 191#define setsoftnet() softintr(1 << SIR_NET) 192#define setsofttty() softintr(1 << SIR_TTY) 193 194#endif /* !_LOCORE */ 195#endif /* _KERNEL */ 196 197#endif /* !_I386_PSL_H_ */ 198