1 /*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * William Jolitz. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * from: @(#)psl.h 5.2 (Berkeley) 1/18/91 37 * $Id: psl.h,v 1.10 1994/05/05 07:39:28 mycroft Exp $ 38 */ 39 40 #ifndef _I386_PSL_H_ 41 #define _I386_PSL_H_ 42 43 /* 44 * 386 processor status longword. 45 */ 46 #define PSL_C 0x00000001 /* carry bit */ 47 #define PSL_PF 0x00000004 /* parity bit */ 48 #define PSL_AF 0x00000010 /* bcd carry bit */ 49 #define PSL_Z 0x00000040 /* zero bit */ 50 #define PSL_N 0x00000080 /* negative bit */ 51 #define PSL_T 0x00000100 /* trace enable bit */ 52 #define PSL_I 0x00000200 /* interrupt enable bit */ 53 #define PSL_D 0x00000400 /* string instruction direction bit */ 54 #define PSL_V 0x00000800 /* overflow bit */ 55 #define PSL_IOPL 0x00003000 /* i/o priviledge level enable */ 56 #define PSL_NT 0x00004000 /* nested task bit */ 57 #define PSL_RF 0x00010000 /* restart flag bit */ 58 #define PSL_VM 0x00020000 /* virtual 8086 mode bit */ 59 #define PSL_AC 0x00040000 /* alignment checking */ 60 #define PSL_VIF 0x00080000 /* virtual interrupt enable */ 61 #define PSL_VIP 0x00100000 /* virtual interrupt pending */ 62 #define PSL_ID 0x00200000 /* identification bit */ 63 64 #define PSL_MBO 0x00000002 /* must be one bits */ 65 #define PSL_MBZ 0xffc08028 /* must be zero bits */ 66 67 #define PSL_USERSET (PSL_MBO | PSL_I) 68 #define PSL_USERCLR (PSL_MBZ | PSL_VIP | PSL_VIF | PSL_NT) 69 70 #ifdef KERNEL 71 #define IPL_NONE -1 72 #define IPL_BIO 0 73 #define IPL_NET 1 74 #define IPL_TTY 2 75 #define IPL_CLOCK 3 76 77 #define SIR_CLOCK 31 78 #define SIR_CLOCKMASK (1 << SIR_CLOCK) 79 #define SIR_NET 30 80 #define SIR_NETMASK ((1 << SIR_NET) | SIR_CLOCKMASK) 81 #define SIR_TTY 29 82 #define SIR_TTYMASK ((1 << SIR_TTY) | SIR_CLOCKMASK) 83 84 #ifndef LOCORE 85 int cpl, ipending, astpending, imask[4]; 86 87 #define SPL(name, adjust) \ 88 static __inline int \ 89 __CONCAT(spl,name)() \ 90 { \ 91 register int ocpl = cpl; \ 92 adjust; \ 93 return ocpl; \ 94 } 95 96 SPL(bio, cpl |= imask[IPL_BIO]) 97 SPL(imp, cpl |= imask[IPL_NET]) 98 SPL(tty, cpl |= imask[IPL_TTY]) 99 SPL(clock, cpl |= imask[IPL_CLOCK]) 100 #define splstatclock() splclock() 101 SPL(high, cpl = -1) 102 /* 103 * splsoftclock() is used by hardclock() to lower the priority from clock to 104 * softclock before it calls softclock(). 105 */ 106 SPL(softclock, cpl = SIR_CLOCKMASK) 107 SPL(softnet, cpl |= SIR_NETMASK) 108 #define splnet() splsoftnet() 109 SPL(softtty, cpl |= SIR_TTYMASK) 110 111 static __inline void 112 spl0() 113 { 114 cpl = 0; 115 if (ipending) 116 spllower(); 117 } 118 119 static __inline void 120 splx(ncpl) 121 register int ncpl; 122 { 123 cpl = ncpl; 124 if (ipending & ~ncpl) 125 spllower(); 126 } 127 128 #define softintr(n) (ipending |= (1 << (n))) 129 #define setsoftast() (astpending = 1) 130 #define setsoftclock() softintr(SIR_CLOCK) 131 #define setsoftnet() softintr(SIR_NET) 132 #define setsofttty() softintr(SIR_TTY) 133 #endif /* !LOCORE */ 134 #endif /* KERNEL */ 135 136 #endif /* !_I386_PSL_H_ */ 137