FreeBSD/Linux Kernel Cross Reference
sys/dev/ic/i8259reg.h
1 /* $NetBSD: i8259reg.h,v 1.2 2001/06/21 18:57:04 thorpej Exp $ */
2
3 /*-
4 * Copyright (c) 2001 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Jason R. Thorpe.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the NetBSD
21 * Foundation, Inc. and its contributors.
22 * 4. Neither the name of The NetBSD Foundation nor the names of its
23 * contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36 * POSSIBILITY OF SUCH DAMAGE.
37 */
38
39 #ifndef _DEV_IC_I8259REG_H_
40 #define _DEV_IC_I8259REG_H_
41
42 /*
43 * Register definitions for the Intel i8259 Programmable Interrupt
44 * Controller.
45 *
46 * XXX More bits should be filled in, here, as this was taken from
47 * XXX the Intel PIIX4 manual. Someone with a real 8259 data sheet
48 * XXX should fill them in.
49 */
50
51 /*
52 * Note a write to ICW1 starts an initialization cycle, and must be
53 * followied by writes to ICW2, ICW3, and ICW4.
54 */
55 #define PIC_ICW1 0x00 /* Initialization Command Word 1 (w) */
56 #define ICW1_IC4 (1U << 0) /* ICW4 Write Required */
57 #define ICW1_SNGL (1U << 1) /* 1 == single, 0 == cascade */
58 #define ICW1_ADI (1U << 2) /* CALL address interval */
59 #define ICW1_LTIM (1U << 3) /* 1 == intrs are level trigger */
60 #define ICW1_SELECT (1U << 4) /* select ICW1 */
61 #define ICW1_IVA(x) ((x) << 5) /* interrupt vector address (MCS-80) */
62
63 #define PIC_ICW2 0x01 /* Initialization Command Word 2 (w) */
64 #define ICW2_VECTOR(x) ((x) & 0xf8) /* vector base address */
65 #define ICW2_IRL(x) ((x) << 0) /* interrupt request level */
66
67 #define PIC_ICW3 0x01 /* Initialization Command Word 3 (w) */
68 #define ICW3_CASCADE(x) (1U << (x)) /* cascaded mode enable */
69 #define ICW3_SIC(x) ((x) << 0) /* slave identifcation code */
70
71 #define PIC_ICW4 0x01 /* Initialization Command Word 4 (w) */
72 #define ICW4_8086 (1U << 0) /* 8086 mode */
73 #define ICW4_AEOI (1U << 1) /* automatic end-of-interrupt */
74 #define ICW4_BUFM (1U << 2) /* buffered mode master */
75 #define ICW4_BUF (1U << 3) /* buffered mode */
76 #define ICW4_SFNM (1U << 4) /* special fully nested mode */
77
78 /*
79 * After an initialization sequence, you get to access the OCWs.
80 */
81 #define PIC_OCW1 0x01 /* Operational Control Word 1 (r/w) */
82 #define OCW1_IRM(x) (1U << (x)) /* interrupt request mask */
83
84 #define PIC_OCW2 0x00 /* Operational Control Word 2 (w) */
85 #define OCW2_SELECT (0) /* select OCW2 */
86 #define OCW3_EOI (1U << 5) /* EOI */
87 #define OCW3_SL (1U << 6) /* specific */
88 #define OCW3_R (1U << 7) /* rotate */
89 #define OCW2_ILS(x) ((x) << 0) /* interrupt level select */
90
91 #define PIC_OCW3 0x00 /* Operational Control Word 3 (r/w) */
92 #define OCW3_SSMM (1U << 6) /* set special mask mode */
93 #define OCW3_SMM (1U << 5) /* 1 = enable smm, 0 = disable */
94 #define OCW3_SELECT (1U << 3) /* select OCW3 */
95 #define OCW3_POLL (1U << 2) /* poll mode command */
96 #define OCW3_RR (1U << 1) /* register read */
97 #define OCW3_RIS (1U << 0) /* 1 = read IS, 0 = read IR */
98
99 #define OCW3_POLL_IRQ(x) ((x) & 0x7f)
100 #define OCW3_POLL_PENDING (1U << 7)
101
102 #endif /* _DEV_IC_I8259REG_H_ */
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