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
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12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
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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 $
41 * AT/386 Interrupt Control constants
45 #ifndef _I386_ISA_ICU_H_
46 #define _I386_ISA_ICU_H_
55 * Most of the SMP equivilants of the icu macros are coded
56 * elsewhere in an MP-safe fashion.
57 * In particular note that the 'imen' variable is opaque.
58 * DO NOT access imen directly, use INTREN()/INTRDIS().
61 void INTREN __P((u_int));
62 void INTRDIS __P((u_int));
67 * Interrupt "level" mechanism variables, masks, and macros
69 extern unsigned imen; /* interrupt mask enable */
71 #define INTREN(s) (imen &= ~(s), SET_ICUS())
72 #define INTRDIS(s) (imen |= (s), SET_ICUS())
76 #define SET_ICUS() (outb(IO_ICU1 + 2, imen), outb(IU_ICU2 + 2, imen >> 8))
77 #define INTRGET() ((inb(IO_ICU2) << 8 | inb(IO_ICU1)) & 0xffff)
79 #define SET_ICUS() (outb(IO_ICU1 + 1, imen), outb(IU_ICU2 + 1, imen >> 8))
80 #define INTRGET() ((inb(IO_ICU2) << 8 | inb(IO_ICU1)) & 0xffff)
84 * XXX - IO_ICU* are defined in isa.h, not icu.h, and nothing much bothers to
85 * include isa.h, while too many things include icu.h.
88 #define SET_ICUS() (outb(0x02, imen), outb(0x0a, imen >> 8))
89 /* XXX is this correct? */
90 #define INTRGET() ((inb(0x0a) << 8 | inb(0x02)) & 0xffff)
92 #define SET_ICUS() (outb(0x21, imen), outb(0xa1, imen >> 8))
93 #define INTRGET() ((inb(0xa1) << 8 | inb(0x21)) & 0xffff)
104 * Note: The APIC uses different values for IRQxxx.
105 * Unfortunately many drivers use the 8259 values as indexes
106 * into tables, etc. The APIC equivilants are kept as APIC_IRQxxx.
107 * The 8259 versions have to be used in SMP for legacy operation
113 * Interrupt enable bits - in normal order of priority (which we change)
115 #define IRQ0 0x0001 /* highest priority - timer */
117 #define IRQ_SLAVE 0x0004
127 #define IRQ3 0x0008 /* this is highest after rotation */
131 #define IRQ7 0x0080 /* lowest - parallel printer */
137 #define IRQ_SLAVE 0x0080
142 * Interrupt Control offset into Interrupt descriptor table (IDT)
144 #define ICU_OFFSET 32 /* 0-31 are processor exceptions */
148 /* 32-47: ISA IRQ0-IRQ15, 48-55: IO APIC IRQ16-IRQ23 */
153 #define ICU_LEN 16 /* 32-47 are ISA interrupts */
157 #endif /* !_I386_ISA_ICU_H_ */