FreeBSD/Linux Kernel Cross Reference
sys/dev/ic/i8259reg.h

     /*      $NetBSD: i8259reg.h,v 1.4 2008/04/28 20:23:50 martin Exp $      */
     
     /*-
      * Copyright (c) 2001 The NetBSD Foundation, Inc.
      * All rights reserved.
      *
      * This code is derived from software contributed to The NetBSD Foundation
      * by Jason R. Thorpe.
      *
     * 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
     */
    
    #ifndef _DEV_IC_I8259REG_H_
    #define _DEV_IC_I8259REG_H_
    
    /*
     * Register definitions for the Intel i8259 Programmable Interrupt
     * Controller.
     *
     * XXX More bits should be filled in, here, as this was taken from
     * XXX the Intel PIIX4 manual.  Someone with a real 8259 data sheet
     * XXX should fill them in.
     */
    
    /*
     * Note a write to ICW1 starts an initialization cycle, and must be
     * followied by writes to ICW2, ICW3, and ICW4.
     */
    #define PIC_ICW1        0x00    /* Initialization Command Word 1 (w) */
    #define ICW1_IC4        (1U << 0)       /* ICW4 Write Required */
    #define ICW1_SNGL       (1U << 1)       /* 1 == single, 0 == cascade */
    #define ICW1_ADI        (1U << 2)       /* CALL address interval */
    #define ICW1_LTIM       (1U << 3)       /* 1 == intrs are level trigger */
    #define ICW1_SELECT     (1U << 4)       /* select ICW1 */
    #define ICW1_IVA(x)     ((x) << 5)      /* interrupt vector address (MCS-80) */
    
    #define PIC_ICW2        0x01    /* Initialization Command Word 2 (w) */
    #define ICW2_VECTOR(x)  ((x) & 0xf8)    /* vector base address */
    #define ICW2_IRL(x)     ((x) << 0)      /* interrupt request level */
    
    #define PIC_ICW3        0x01    /* Initialization Command Word 3 (w) */
    #define ICW3_CASCADE(x) (1U << (x))     /* cascaded mode enable */
    #define ICW3_SIC(x)     ((x) << 0)      /* slave identifcation code */
    
    #define PIC_ICW4        0x01    /* Initialization Command Word 4 (w) */
    #define ICW4_8086       (1U << 0)       /* 8086 mode */
    #define ICW4_AEOI       (1U << 1)       /* automatic end-of-interrupt */
    #define ICW4_BUFM       (1U << 2)       /* buffered mode master */
    #define ICW4_BUF        (1U << 3)       /* buffered mode */
    #define ICW4_SFNM       (1U << 4)       /* special fully nested mode */
    
    /*
     * After an initialization sequence, you get to access the OCWs.
     */
    #define PIC_OCW1        0x01    /* Operational Control Word 1 (r/w) */
    #define OCW1_IRM(x)     (1U << (x))     /* interrupt request mask */
    
    #define PIC_OCW2        0x00    /* Operational Control Word 2 (w) */
    #define OCW2_SELECT     (0)             /* select OCW2 */
    #define OCW2_EOI        (1U << 5)       /* EOI */
    #define OCW2_SL         (1U << 6)       /* specific */
    #define OCW2_R          (1U << 7)       /* rotate */
    #define OCW2_ILS(x)     ((x) << 0)      /* interrupt level select */
    
    #define PIC_OCW3        0x00    /* Operational Control Word 3 (r/w) */
    #define OCW3_SSMM       (1U << 6)       /* set special mask mode */
    #define OCW3_SMM        (1U << 5)       /* 1 = enable smm, 0 = disable */
    #define OCW3_SELECT     (1U << 3)       /* select OCW3 */
    #define OCW3_POLL       (1U << 2)       /* poll mode command */
    #define OCW3_RR         (1U << 1)       /* register read */
    #define OCW3_RIS        (1U << 0)       /* 1 = read IS, 0 = read IR */
    
    #define OCW3_POLL_IRQ(x) ((x) & 0x7f)
    #define OCW3_POLL_PENDING (1U << 7)
    
    #endif /* _DEV_IC_I8259REG_H_ */

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