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.
 *
 *      @(#)icu.h       5.6 (Berkeley) 5/9/91
 *
 * PATCHES MAGIC                LEVEL   PATCH THAT GOT US HERE
 * --------------------         -----   ----------------------
 * CURRENT PATCH LEVEL:         1       00158
 * --------------------         -----   ----------------------
 *
 * 25 Apr 93    Bruce Evans             New fast interrupt code (intr-0.1)
 */

/*
 * AT/386 Interrupt Control constants
 * W. Jolitz 8/89
 */

#ifndef __ICU__
#define __ICU__

#ifndef LOCORE

/*
 * Interrupt "level" mechanism variables, masks, and macros
 */
extern  unsigned imen;          /* interrupt mask enable */
extern  unsigned cpl;           /* current priority level mask */

extern  unsigned highmask;      /* group of interrupts masked with splhigh() */
extern  unsigned ttymask;       /* group of interrupts masked with spltty() */
extern  unsigned biomask;       /* group of interrupts masked with splbio() */
extern  unsigned netmask;       /* group of interrupts masked with splimp() */

#define INTREN(s)       (imen &= ~(s), SET_ICUS())
#define INTRDIS(s)      (imen |= (s), SET_ICUS())
#define INTRMASK(msk,s) (msk |= (s))
#if 0
#define SET_ICUS()      (outb(IO_ICU1 + 1, imen), outb(IU_ICU2 + 1, imen >> 8))
#else
/*
 * XXX - IO_ICU* are defined in isa.h, not icu.h, and nothing much bothers to
 * include isa.h, while too many things include icu.h.
 */
#define SET_ICUS()      (outb(0x21, imen), outb(0xa1, imen >> 8))
#endif

#endif

/*
 * Interrupt enable bits -- in order of priority
 */
#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
#define IRQ4            0x0010
#define IRQ5            0x0020
#define IRQ6            0x0040
#define IRQ7            0x0080          /* lowest - parallel printer */

/*
 * Interrupt Control offset into Interrupt descriptor table (IDT)
 */
#define ICU_OFFSET      32              /* 0-31 are processor exceptions */
#define ICU_LEN         16              /* 32-47 are ISA interrupts */

#endif  __ICU__