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