2 * Copyright (c) 1990 The Regents of the University of California.
5 * This code is derived from software contributed to Berkeley by
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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 * 4. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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32 * from: @(#)icu.h 5.6 (Berkeley) 5/9/91
37 * AT/386 Interrupt Control constants
41 #ifndef _X86_ISA_ICU_H_
42 #define _X86_ISA_ICU_H_
45 #define ICU_IMR_OFFSET 2
47 #define ICU_IMR_OFFSET 1
51 * PC-98 machines wire the slave 8259A to pin 7 on the master PIC, and
52 * PC-AT machines wire the slave PIC to pin 2 on the master PIC.
61 * Determine the base master and slave modes not including auto EOI support.
62 * All machines that FreeBSD supports use 8086 mode.
66 * PC-98 machines do not support auto EOI on the second PIC. Also, it
67 * seems that PC-98 machine PICs use buffered mode, and the master PIC
68 * uses special fully nested mode.
70 #define BASE_MASTER_MODE (ICW4_SFNM | ICW4_BUF | ICW4_MS | ICW4_8086)
71 #define BASE_SLAVE_MODE (ICW4_BUF | ICW4_8086)
73 #define BASE_MASTER_MODE ICW4_8086
74 #define BASE_SLAVE_MODE ICW4_8086
77 /* Enable automatic EOI if requested. */
79 #define MASTER_MODE (BASE_MASTER_MODE | ICW4_AEOI)
81 #define MASTER_MODE BASE_MASTER_MODE
84 #define SLAVE_MODE (BASE_SLAVE_MODE | ICW4_AEOI)
86 #define SLAVE_MODE BASE_SLAVE_MODE
89 #define IRQ_MASK(irq) (1 << (irq))
90 #define IMEN_MASK(ai) (IRQ_MASK((ai)->at_irq))
92 void atpic_handle_intr(u_int vector, struct trapframe *frame);
93 void atpic_startup(void);
95 #endif /* !_X86_ISA_ICU_H_ */