icu.h revision 4 
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 *	@(#)icu.h	5.6 (Berkeley) 5/9/91
37 *
38 * PATCHES MAGIC                LEVEL   PATCH THAT GOT US HERE
39 * --------------------         -----   ----------------------
40 * CURRENT PATCH LEVEL:         1       00158
41 * --------------------         -----   ----------------------
42 *
43 * 25 Apr 93	Bruce Evans		New fast interrupt code (intr-0.1)
44 */
45
46/*
47 * AT/386 Interrupt Control constants
48 * W. Jolitz 8/89
49 */
50
51#ifndef	__ICU__
52#define	__ICU__
53
54#ifndef	LOCORE
55
56/*
57 * Interrupt "level" mechanism variables, masks, and macros
58 */
59extern	unsigned imen;		/* interrupt mask enable */
60extern	unsigned cpl;		/* current priority level mask */
61
62extern	unsigned highmask;	/* group of interrupts masked with splhigh() */
63extern	unsigned ttymask;	/* group of interrupts masked with spltty() */
64extern	unsigned biomask;	/* group of interrupts masked with splbio() */
65extern	unsigned netmask;	/* group of interrupts masked with splimp() */
66
67#define	INTREN(s)	(imen &= ~(s), SET_ICUS())
68#define	INTRDIS(s)	(imen |= (s), SET_ICUS())
69#define	INTRMASK(msk,s)	(msk |= (s))
70#if 0
71#define SET_ICUS()	(outb(IO_ICU1 + 1, imen), outb(IU_ICU2 + 1, imen >> 8))
72#else
73/*
74 * XXX - IO_ICU* are defined in isa.h, not icu.h, and nothing much bothers to
75 * include isa.h, while too many things include icu.h.
76 */
77#define SET_ICUS()	(outb(0x21, imen), outb(0xa1, imen >> 8))
78#endif
79
80#endif
81
82/*
83 * Interrupt enable bits -- in order of priority
84 */
85#define	IRQ0		0x0001		/* highest priority - timer */
86#define	IRQ1		0x0002
87#define	IRQ_SLAVE	0x0004
88#define	IRQ8		0x0100
89#define	IRQ9		0x0200
90#define	IRQ2		IRQ9
91#define	IRQ10		0x0400
92#define	IRQ11		0x0800
93#define	IRQ12		0x1000
94#define	IRQ13		0x2000
95#define	IRQ14		0x4000
96#define	IRQ15		0x8000
97#define	IRQ3		0x0008
98#define	IRQ4		0x0010
99#define	IRQ5		0x0020
100#define	IRQ6		0x0040
101#define	IRQ7		0x0080		/* lowest - parallel printer */
102
103/*
104 * Interrupt Control offset into Interrupt descriptor table (IDT)
105 */
106#define	ICU_OFFSET	32		/* 0-31 are processor exceptions */
107#define	ICU_LEN		16		/* 32-47 are ISA interrupts */
108
109#endif	__ICU__
110