2 * Copyright (c) 1990 The Regents of the University of California.
5 * This code is derived from software contributed to Berkeley by
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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.
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
36 * from: @(#)icu.h 5.6 (Berkeley) 5/9/91
37 * $FreeBSD: src/sys/i386/isa/icu.h,v 1.18 1999/12/26 12:43:47 bde Exp $
38 * $DragonFly: src/sys/platform/pc32/icu/icu.h,v 1.5 2005/02/27 12:44:43 asmodai Exp $
42 * AT/386 Interrupt Control constants
46 #ifndef _I386_ISA_ICU_H_
47 #define _I386_ISA_ICU_H_
58 * Note: The APIC uses different values for IRQxxx.
59 * Unfortunately many drivers use the 8259 values as indexes
60 * into tables, etc. The APIC equivilants are kept as APIC_IRQxxx.
61 * The 8259 versions have to be used in SMP for legacy operation
67 * Interrupt enable bits - in normal order of priority (which we change)
69 #define IRQ0 0x0001 /* highest priority - timer */
71 #define IRQ_SLAVE 0x0004
81 #define IRQ3 0x0008 /* this is highest after rotation */
85 #define IRQ7 0x0080 /* lowest - parallel printer */
89 * Interrupt Control offset into Interrupt descriptor table (IDT)
91 #define ICU_OFFSET 32 /* 0-31 are processor exceptions */
95 /* 32-47: ISA IRQ0-IRQ15, 48-55: IO APIC IRQ16-IRQ23 */
100 #define ICU_LEN 16 /* 32-47 are ISA interrupts */
104 #endif /* !_I386_ISA_ICU_H_ */