The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/i386/isa/icu.h

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    1 /*-
    2  * Copyright (c) 1990 The Regents of the University of California.
    3  * All rights reserved.
    4  *
    5  * This code is derived from software contributed to Berkeley by
    6  * William Jolitz.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. All advertising materials mentioning features or use of this software
   17  *    must display the following acknowledgement:
   18  *      This product includes software developed by the University of
   19  *      California, Berkeley and its contributors.
   20  * 4. Neither the name of the University nor the names of its contributors
   21  *    may be used to endorse or promote products derived from this software
   22  *    without specific prior written permission.
   23  *
   24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   34  * SUCH DAMAGE.
   35  *
   36  *      from: @(#)icu.h 5.6 (Berkeley) 5/9/91
   37  * $FreeBSD: releng/5.0/sys/i386/isa/icu.h 93945 2002-04-06 08:25:05Z nyan $
   38  */
   39 
   40 /*
   41  * AT/386 Interrupt Control constants
   42  * W. Jolitz 8/89
   43  */
   44 
   45 #ifndef _I386_ISA_ICU_H_
   46 #define _I386_ISA_ICU_H_
   47 
   48 #ifndef LOCORE
   49 
   50 /*
   51  * Note:
   52  *      Most of the SMP equivilants of the icu macros are coded
   53  *      elsewhere in an MP-safe fashion.
   54  *      In particular note that the 'imen' variable is opaque.
   55  *      DO NOT access imen directly, use INTREN()/INTRDIS().
   56  */
   57 
   58 void    INTREN(u_int);
   59 void    INTRDIS(u_int);
   60 
   61 #ifdef APIC_IO
   62 extern  unsigned apic_imen;     /* APIC interrupt mask enable */
   63 #else
   64 extern  unsigned imen;          /* interrupt mask enable */
   65 #endif
   66 
   67 #endif /* LOCORE */
   68 
   69 
   70 #ifdef APIC_IO
   71 /*
   72  * Note: The APIC uses different values for IRQxxx.
   73  *       Unfortunately many drivers use the 8259 values as indexes
   74  *       into tables, etc.  The APIC equivilants are kept as APIC_IRQxxx.
   75  *       The 8259 versions have to be used in SMP for legacy operation
   76  *       of the drivers.
   77  */
   78 #endif /* APIC_IO */
   79 
   80 /*
   81  * Interrupt enable bits - in normal order of priority (which we change)
   82  */
   83 #ifdef PC98
   84 #define IRQ0            0x0001
   85 #define IRQ1            0x0002
   86 #define IRQ2            0x0004
   87 #define IRQ3            0x0008
   88 #define IRQ4            0x0010
   89 #define IRQ5            0x0020
   90 #define IRQ6            0x0040
   91 #define IRQ7            0x0080
   92 #define IRQ_SLAVE       0x0080
   93 #define IRQ8            0x0100
   94 #define IRQ9            0x0200
   95 #define IRQ10           0x0400
   96 #define IRQ11           0x0800
   97 #define IRQ12           0x1000
   98 #define IRQ13           0x2000
   99 #define IRQ14           0x4000
  100 #define IRQ15           0x8000
  101 #else
  102 #define IRQ0            0x0001          /* highest priority - timer */
  103 #define IRQ1            0x0002
  104 #define IRQ_SLAVE       0x0004
  105 #define IRQ8            0x0100
  106 #define IRQ9            0x0200
  107 #define IRQ2            IRQ9
  108 #define IRQ10           0x0400
  109 #define IRQ11           0x0800
  110 #define IRQ12           0x1000
  111 #define IRQ13           0x2000
  112 #define IRQ14           0x4000
  113 #define IRQ15           0x8000
  114 #define IRQ3            0x0008          /* this is highest after rotation */
  115 #define IRQ4            0x0010
  116 #define IRQ5            0x0020
  117 #define IRQ6            0x0040
  118 #define IRQ7            0x0080          /* lowest - parallel printer */
  119 #endif
  120 
  121 /*
  122  * Interrupt Control offset into Interrupt descriptor table (IDT)
  123  */
  124 #define ICU_OFFSET      32              /* 0-31 are processor exceptions */
  125 
  126 #ifdef PC98
  127 #define ICU_IMR_OFFSET  2
  128 #define ICU_SLAVEID     7
  129 #else
  130 #define ICU_IMR_OFFSET  1
  131 #define ICU_SLAVEID     2
  132 #endif
  133 #define ICU_EOI         0x20
  134 
  135 #ifdef APIC_IO
  136 
  137 /* 32-47: ISA IRQ0-IRQ15, 48-63: IO APIC IRQ16-IRQ31 */
  138 #define ICU_LEN         32
  139 #define HWI_MASK        0xffffffff      /* bits for h/w interrupts */
  140 #define NHWI            32
  141 
  142 #else
  143 
  144 #define ICU_LEN         16              /* 32-47 are ISA interrupts */
  145 #define HWI_MASK        0xffff          /* bits for h/w interrupts */
  146 #define NHWI            16
  147 
  148 #endif /* APIC_IO */
  149 
  150 #define INTRCNT_COUNT   (1 + ICU_LEN + 2 * ICU_LEN)
  151 
  152 #endif /* !_I386_ISA_ICU_H_ */

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