FreeBSD/Linux Kernel Cross Reference
sys/i386/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.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 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/5.1/sys/i386/isa/icu.h 93945 2002-04-06 08:25:05Z nyan $
     */
    
    /*
     * AT/386 Interrupt Control constants
     * W. Jolitz 8/89
     */
    
    #ifndef _I386_ISA_ICU_H_
    #define _I386_ISA_ICU_H_
    
    #ifndef LOCORE
    
    /*
     * Note:
     *      Most of the SMP equivilants of the icu macros are coded
     *      elsewhere in an MP-safe fashion.
     *      In particular note that the 'imen' variable is opaque.
     *      DO NOT access imen directly, use INTREN()/INTRDIS().
     */
    
    void    INTREN(u_int);
    void    INTRDIS(u_int);
    
    #ifdef APIC_IO
    extern  unsigned apic_imen;     /* APIC interrupt mask enable */
    #else
    extern  unsigned imen;          /* interrupt mask enable */
    #endif
    
    #endif /* LOCORE */
    
    
    #ifdef APIC_IO
    /*
     * Note: The APIC uses different values for IRQxxx.
     *       Unfortunately many drivers use the 8259 values as indexes
     *       into tables, etc.  The APIC equivilants are kept as APIC_IRQxxx.
     *       The 8259 versions have to be used in SMP for legacy operation
     *       of the drivers.
     */
    #endif /* APIC_IO */
    
    /*
     * Interrupt enable bits - in normal order of priority (which we change)
     */
    #ifdef PC98
    #define IRQ0            0x0001
    #define IRQ1            0x0002
    #define IRQ2            0x0004
    #define IRQ3            0x0008
    #define IRQ4            0x0010
    #define IRQ5            0x0020
    #define IRQ6            0x0040
    #define IRQ7            0x0080
    #define IRQ_SLAVE       0x0080
    #define IRQ8            0x0100
    #define IRQ9            0x0200
    #define IRQ10           0x0400
    #define IRQ11           0x0800
    #define IRQ12           0x1000
    #define IRQ13           0x2000
    #define IRQ14           0x4000
   #define IRQ15           0x8000
   #else
   #define IRQ0            0x0001          /* highest priority - timer */
   #define IRQ1            0x0002
   #define IRQ_SLAVE       0x0004
   #define IRQ8            0x0100
   #define IRQ9            0x0200
   #define IRQ2            IRQ9
   #define IRQ10           0x0400
   #define IRQ11           0x0800
   #define IRQ12           0x1000
   #define IRQ13           0x2000
   #define IRQ14           0x4000
   #define IRQ15           0x8000
   #define IRQ3            0x0008          /* this is highest after rotation */
   #define IRQ4            0x0010
   #define IRQ5            0x0020
   #define IRQ6            0x0040
   #define IRQ7            0x0080          /* lowest - parallel printer */
   #endif
   
   /*
    * Interrupt Control offset into Interrupt descriptor table (IDT)
    */
   #define ICU_OFFSET      32              /* 0-31 are processor exceptions */
   
   #ifdef PC98
   #define ICU_IMR_OFFSET  2
   #define ICU_SLAVEID     7
   #else
   #define ICU_IMR_OFFSET  1
   #define ICU_SLAVEID     2
   #endif
   #define ICU_EOI         0x20
   
   #ifdef APIC_IO
   
   /* 32-47: ISA IRQ0-IRQ15, 48-63: IO APIC IRQ16-IRQ31 */
   #define ICU_LEN         32
   #define HWI_MASK        0xffffffff      /* bits for h/w interrupts */
   #define NHWI            32
   
   #else
   
   #define ICU_LEN         16              /* 32-47 are ISA interrupts */
   #define HWI_MASK        0xffff          /* bits for h/w interrupts */
   #define NHWI            16
   
   #endif /* APIC_IO */
   
   #define INTRCNT_COUNT   (1 + ICU_LEN + 2 * ICU_LEN)
   
   #endif /* !_I386_ISA_ICU_H_ */

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