text: /* $NetBSD: irq.h,v 1.2 2002/03/24 23:37:43 bjh21 Exp $ */
  /*-
   * Copyright (c) 2000 Ben Harris
   * All rights reserved.
   *
   * 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. The name of the author may not be used to endorse or promote products
   *    derived from this software without specific prior written permission.
   * 
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 _ARM26_IRQ_H
  #define _ARM26_IRQ_H
  #include <arch/acorn26/iobus/iocreg.h>
  
  /* return values from interrupt handlers */
  /* These are the same as arm32 uses */
  #define IRQ_HANDLED		1
  #define IRQ_NOT_HANDLED		0
  #define IRQ_MAYBE_HANDLED	-1
  
  /*
   * These definitions specify how the devices are wired to the IOC
   * interrupt lines.
   */
  /* All systems */
  #define IRQ_PFIQ	IOC_IRQ_IL0	/* Podule FIQ request */
  #define	IRQ_SIRQ	IOC_IRQ_IL1	/* Sound buffer pointer used */
  #define IRQ_PIRQ	IOC_IRQ_IL5	/* Podule IRQ request */
  #define IRQ_VFLYBK	IOC_IRQ_IR	/* Start of display vertical flyback */
  /* Archimedes systems */
  #define IRQ_SLCI	IOC_IRQ_IL2	/* Serial line controller interrupt */
  #define IRQ_WIRQ	IOC_IRQ_IL3	/* Winchester interrupt request */
  #define IRQ_DCIRQ	IOC_IRQ_IL4	/* Disc change interrupt request */
  #define IRQ_PBSY	IOC_IRQ_IL6	/* Printer Busy Input */
  #define IRQ_RII		IOC_IRQ_IL7	/* Serial line ring indicator input */
  #define IRQ_PACK	IOC_IRQ_IF	/* Printer acknowledge input */
  /* IOEB systems */
  #define IRQ_SINTR	IOC_IRQ_IL2	/* Serial line interrupt */
  #define IRQ_IDEINTR	IOC_IRQ_IL3	/* IDE interrupt */
  #define IRQ_FINTR	IOC_IRQ_IL4	/* Floppy disc interrupt */
  #define IRQ_LPINTR	IOC_IRQ_IL6	/* Parallel port latched interrupt */
  #define IRQ_INDEX	IOC_IRQ_IF	/* Start of floppy disc index pulse */
  
  /* IRQ numbers above 15 are non-IOC IRQs */
  #define IRQ_UNIXBP_BASE	16
  
  struct irq_handler;
  struct evcnt;
  
  extern void irq_init(void);
  /* irq_handler is declared in machdep.h */
  /* splx, raisespl and lowerspl are declared in intr.h */
  extern struct irq_handler *irq_establish(int, int, int(*)(void *), void *,
      struct evcnt *);
  extern char const *irq_string(struct irq_handler *);
  extern void irq_enable(struct irq_handler *);
  extern void irq_disable(struct irq_handler *);
  extern void irq_genmasks(void);
  extern void irq_stat(void (*)(const char *, ...));
  #endif
  