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87 lines
3.5 KiB
C
87 lines
3.5 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2003 Peter Wemm
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Register defintions for the i8259A programmable interrupt controller.
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*/
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#ifndef _DEV_IC_I8259_H_
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#define _DEV_IC_I8259_H_
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/* Initialization control word 1. Written to even address. */
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#define ICW1_IC4 0x01 /* ICW4 present */
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#define ICW1_SNGL 0x02 /* 1 = single, 0 = cascaded */
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#define ICW1_ADI 0x04 /* 1 = 4, 0 = 8 byte vectors */
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#define ICW1_LTIM 0x08 /* 1 = level trigger, 0 = edge */
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#define ICW1_RESET 0x10 /* must be 1 */
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/* 0x20 - 0x80 - in 8080/8085 mode only */
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/* Initialization control word 2. Written to the odd address. */
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/* No definitions, it is the base vector of the IDT for 8086 mode */
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/* Initialization control word 3. Written to the odd address. */
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/* For a master PIC, bitfield indicating a slave 8259 on given input */
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/* For slave, lower 3 bits are the slave's ID binary id on master */
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/* Initialization control word 4. Written to the odd address. */
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#define ICW4_8086 0x01 /* 1 = 8086, 0 = 8080 */
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#define ICW4_AEOI 0x02 /* 1 = Auto EOI */
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#define ICW4_MS 0x04 /* 1 = buffered master, 0 = slave */
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#define ICW4_BUF 0x08 /* 1 = enable buffer mode */
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#define ICW4_SFNM 0x10 /* 1 = special fully nested mode */
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/* Operation control words. Written after initialization. */
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/* Operation control word type 1 */
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/*
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* No definitions. Written to the odd address. Bitmask for interrupts.
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* 1 = disabled.
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*/
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/* Operation control word type 2. Bit 3 (0x08) must be zero. Even address. */
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#define OCW2_L0 0x01 /* Level */
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#define OCW2_L1 0x02
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#define OCW2_L2 0x04
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/* 0x08 must be 0 to select OCW2 vs OCW3 */
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/* 0x10 must be 0 to select OCW2 vs ICW1 */
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#define OCW2_EOI 0x20 /* 1 = EOI */
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#define OCW2_SL 0x40 /* EOI mode */
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#define OCW2_R 0x80 /* EOI mode */
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/* Operation control word type 3. Bit 3 (0x08) must be set. Even address. */
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#define OCW3_RIS 0x01 /* 1 = read IS, 0 = read IR */
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#define OCW3_RR 0x02 /* register read */
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#define OCW3_P 0x04 /* poll mode command */
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/* 0x08 must be 1 to select OCW3 vs OCW2 */
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#define OCW3_SEL 0x08 /* must be 1 */
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/* 0x10 must be 0 to select OCW3 vs ICW1 */
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#define OCW3_SMM 0x20 /* special mode mask */
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#define OCW3_ESMM 0x40 /* enable SMM */
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#endif /* !_DEV_IC_I8259_H_ */
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