icu.h revision 330897 
1294765Simp/*-
2294765Simp * SPDX-License-Identifier: BSD-3-Clause
3294765Simp *
4294765Simp * Copyright (c) 1990 The Regents of the University of California.
5294765Simp * All rights reserved.
6294765Simp *
7294765Simp * This code is derived from software contributed to Berkeley by
8294765Simp * William Jolitz.
9294765Simp *
10294765Simp * Redistribution and use in source and binary forms, with or without
11294765Simp * modification, are permitted provided that the following conditions
12294765Simp * are met:
13294765Simp * 1. Redistributions of source code must retain the above copyright
14294765Simp *    notice, this list of conditions and the following disclaimer.
15294765Simp * 2. Redistributions in binary form must reproduce the above copyright
16294765Simp *    notice, this list of conditions and the following disclaimer in the
17294765Simp *    documentation and/or other materials provided with the distribution.
18294765Simp * 4. Neither the name of the University nor the names of its contributors
19294765Simp *    may be used to endorse or promote products derived from this software
20294765Simp *    without specific prior written permission.
21294765Simp *
22294765Simp * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23294765Simp * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24294765Simp * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25294765Simp * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26294765Simp * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27294765Simp * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28294765Simp * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29294765Simp * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30294765Simp * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31294765Simp * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32294765Simp * SUCH DAMAGE.
33294765Simp *
34294765Simp *	from: @(#)icu.h	5.6 (Berkeley) 5/9/91
35294765Simp * $FreeBSD: stable/11/sys/x86/isa/icu.h 330897 2018-03-14 03:19:51Z eadler $
36348866Skevans */
37294765Simp
38294765Simp/*
39294765Simp * AT/386 Interrupt Control constants
40 * W. Jolitz 8/89
41 */
42
43#ifndef _X86_ISA_ICU_H_
44#define	_X86_ISA_ICU_H_
45
46#ifdef PC98
47#define	ICU_IMR_OFFSET	2
48#else
49#define	ICU_IMR_OFFSET	1
50#endif
51
52/*
53 * PC-98 machines wire the slave 8259A to pin 7 on the master PIC, and
54 * PC-AT machines wire the slave PIC to pin 2 on the master PIC.
55 */
56#ifdef PC98
57#define	ICU_SLAVEID	7
58#else
59#define	ICU_SLAVEID	2
60#endif
61
62/*
63 * Determine the base master and slave modes not including auto EOI support.
64 * All machines that FreeBSD supports use 8086 mode.
65 */
66#ifdef PC98
67/*
68 * PC-98 machines do not support auto EOI on the second PIC.  Also, it
69 * seems that PC-98 machine PICs use buffered mode, and the master PIC
70 * uses special fully nested mode.
71 */
72#define	BASE_MASTER_MODE	(ICW4_SFNM | ICW4_BUF | ICW4_MS | ICW4_8086)
73#define	BASE_SLAVE_MODE		(ICW4_BUF | ICW4_8086)
74#else
75#define	BASE_MASTER_MODE	ICW4_8086
76#define	BASE_SLAVE_MODE		ICW4_8086
77#endif
78
79/* Enable automatic EOI if requested. */
80#ifdef AUTO_EOI_1
81#define	MASTER_MODE		(BASE_MASTER_MODE | ICW4_AEOI)
82#else
83#define	MASTER_MODE		BASE_MASTER_MODE
84#endif
85#ifdef AUTO_EOI_2
86#define	SLAVE_MODE		(BASE_SLAVE_MODE | ICW4_AEOI)
87#else
88#define	SLAVE_MODE		BASE_SLAVE_MODE
89#endif
90
91#define	IRQ_MASK(irq)		(1 << (irq))
92#define	IMEN_MASK(ai)		(IRQ_MASK((ai)->at_irq))
93
94void	atpic_handle_intr(u_int vector, struct trapframe *frame);
95void	atpic_startup(void);
96
97#endif /* !_X86_ISA_ICU_H_ */
98