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  1. /*
  2.  * Copyright (C) 2006 Jakub Jermar
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /** @addtogroup genericinterrupt
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #ifndef KERN_IRQ_H_
  36. #define KERN_IRQ_H_
  37.  
  38. #include <arch/types.h>
  39. #include <adt/list.h>
  40.  
  41. typedef int32_t inr_t;
  42. typedef int32_t devno_t;
  43.  
  44. typedef enum {
  45.     IRQ_DECLINE,        /**< Decline to service. */
  46.     IRQ_ACCEPT      /**< Accept to service. */
  47. } irq_ownership_t;
  48.  
  49. typedef enum {
  50.     IRQ_TRIGGER_LEVEL = 1,
  51.     IRQ_TRIGGER_EDGE
  52. } irq_trigger_t;
  53.  
  54. typedef struct irq irq_t;
  55.  
  56. typedef void (* irq_handler_t)(irq_t *irq, void *arg, ...);
  57.  
  58. /** Structure representing one device IRQ.
  59.  *
  60.  * If one device has multiple interrupts, there will
  61.  * be multiple irq_t instantions with the same
  62.  * devno.
  63.  */
  64. struct irq {
  65.     /** Hash table link. */
  66.     link_t link;
  67.  
  68.     /** Unique device number. -1 if not yet assigned. */
  69.     devno_t devno;
  70.  
  71.     /** Actual IRQ number. -1 if not yet assigned. */
  72.     inr_t inr;
  73.     /** Task ID of the task to be notified about the IRQ or 0. */
  74.     task_id_t notif;
  75.     /** Trigger level of the IRQ.*/
  76.     irq_trigger_t trigger;
  77.     /** Claim ownership of the IRQ. */
  78.     irq_ownership_t (* claim)(void);
  79.     /** Handler for this IRQ and device. */
  80.     irq_handler_t handler;
  81.     /** Argument for the handler. */
  82.     void *arg;
  83. };
  84.  
  85. extern void irq_init(count_t inrs, count_t chains);
  86. extern void irq_initialize(irq_t *irq);
  87. extern void irq_register(irq_t *irq);
  88. extern irq_t *irq_dispatch(inr_t inr);
  89.  
  90. #endif
  91.  
  92. /** @}
  93.  */
  94.