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 * 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.
19 *
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
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 *	from: @(#)icu.h	5.6 (Berkeley) 5/9/91
33 * $FreeBSD: stable/11/sys/x86/isa/icu.h 339928 2018-10-30 19:10:41Z jhb $
34 */
35
36/*
37 * AT/386 Interrupt Control constants
38 * W. Jolitz 8/89
39 */
40
41#ifndef _X86_ISA_ICU_H_
42#define	_X86_ISA_ICU_H_
43
44#ifdef PC98
45#define	ICU_IMR_OFFSET	2
46#else
47#define	ICU_IMR_OFFSET	1
48#endif
49
50/*
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.
53 */
54#ifdef PC98
55#define	ICU_SLAVEID	7
56#else
57#define	ICU_SLAVEID	2
58#endif
59
60/*
61 * Determine the base master and slave modes not including auto EOI support.
62 * All machines that FreeBSD supports use 8086 mode.
63 */
64#ifdef PC98
65/*
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.
69 */
70#define	BASE_MASTER_MODE	(ICW4_SFNM | ICW4_BUF | ICW4_MS | ICW4_8086)
71#define	BASE_SLAVE_MODE		(ICW4_BUF | ICW4_8086)
72#else
73#define	BASE_MASTER_MODE	ICW4_8086
74#define	BASE_SLAVE_MODE		ICW4_8086
75#endif
76
77/* Enable automatic EOI if requested. */
78#ifdef AUTO_EOI_1
79#define	MASTER_MODE		(BASE_MASTER_MODE | ICW4_AEOI)
80#else
81#define	MASTER_MODE		BASE_MASTER_MODE
82#endif
83#ifdef AUTO_EOI_2
84#define	SLAVE_MODE		(BASE_SLAVE_MODE | ICW4_AEOI)
85#else
86#define	SLAVE_MODE		BASE_SLAVE_MODE
87#endif
88
89#define	IRQ_MASK(irq)		(1 << (irq))
90
91void	atpic_handle_intr(u_int vector, struct trapframe *frame);
92void	atpic_startup(void);
93
94#endif /* !_X86_ISA_ICU_H_ */
95