FreeBSD/Linux Kernel Cross Reference
sys/x86/isa/icu.h

     /*-
      * Copyright (c) 1990 The Regents of the University of California.
      * All rights reserved.
      *
      * This code is derived from software contributed to Berkeley by
      * William Jolitz.
      *
      * 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.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
     *
     *      from: @(#)icu.h 5.6 (Berkeley) 5/9/91
     * $FreeBSD: releng/11.2/sys/x86/isa/icu.h 331722 2018-03-29 02:50:57Z eadler $
     */
    
    /*
     * AT/386 Interrupt Control constants
     * W. Jolitz 8/89
     */
    
    #ifndef _X86_ISA_ICU_H_
    #define _X86_ISA_ICU_H_
    
    #ifdef PC98
    #define ICU_IMR_OFFSET  2
    #else
    #define ICU_IMR_OFFSET  1
    #endif
    
    /*
     * PC-98 machines wire the slave 8259A to pin 7 on the master PIC, and
     * PC-AT machines wire the slave PIC to pin 2 on the master PIC.
     */
    #ifdef PC98
    #define ICU_SLAVEID     7
    #else
    #define ICU_SLAVEID     2
    #endif
    
    /*
     * Determine the base master and slave modes not including auto EOI support.
     * All machines that FreeBSD supports use 8086 mode.
     */
    #ifdef PC98
    /*
     * PC-98 machines do not support auto EOI on the second PIC.  Also, it
     * seems that PC-98 machine PICs use buffered mode, and the master PIC
     * uses special fully nested mode.
     */
    #define BASE_MASTER_MODE        (ICW4_SFNM | ICW4_BUF | ICW4_MS | ICW4_8086)
    #define BASE_SLAVE_MODE         (ICW4_BUF | ICW4_8086)
    #else
    #define BASE_MASTER_MODE        ICW4_8086
    #define BASE_SLAVE_MODE         ICW4_8086
    #endif
    
    /* Enable automatic EOI if requested. */
    #ifdef AUTO_EOI_1
    #define MASTER_MODE             (BASE_MASTER_MODE | ICW4_AEOI)
    #else
    #define MASTER_MODE             BASE_MASTER_MODE
    #endif
    #ifdef AUTO_EOI_2
    #define SLAVE_MODE              (BASE_SLAVE_MODE | ICW4_AEOI)
    #else
    #define SLAVE_MODE              BASE_SLAVE_MODE
    #endif
    
    #define IRQ_MASK(irq)           (1 << (irq))
    #define IMEN_MASK(ai)           (IRQ_MASK((ai)->at_irq))
    
    void    atpic_handle_intr(u_int vector, struct trapframe *frame);
    void    atpic_startup(void);
    
    #endif /* !_X86_ISA_ICU_H_ */

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