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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 genericddi
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #ifndef KERN_IRQ_H_
  36. #define KERN_IRQ_H_
  37.  
  38. #include <arch/types.h>
  39. #include <typedefs.h>
  40. #include <adt/list.h>
  41. #include <ipc/irq.h>
  42. #include <synch/spinlock.h>
  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 void (* irq_handler_t)(irq_t *irq, void *arg, ...);
  55.  
  56. /** Structure representing one device IRQ.
  57.  *
  58.  * If one device has multiple interrupts, there will
  59.  * be multiple irq_t instantions with the same
  60.  * devno.
  61.  */
  62. struct irq {
  63.     /** Hash table link. */
  64.     link_t link;
  65.  
  66.     /** Lock protecting everything in this structure
  67.      *  except the link member. When both the IRQ
  68.      *  hash table lock and this lock are to be acquired,
  69.      *  this lock must not be taken first.
  70.      */
  71.     SPINLOCK_DECLARE(lock);
  72.  
  73.     /** Unique device number. -1 if not yet assigned. */
  74.     devno_t devno;
  75.  
  76.     /** Actual IRQ number. -1 if not yet assigned. */
  77.     inr_t inr;
  78.     /** Trigger level of the IRQ.*/
  79.     irq_trigger_t trigger;
  80.     /** Claim ownership of the IRQ. */
  81.     irq_ownership_t (* claim)(void);
  82.     /** Handler for this IRQ and device. */
  83.     irq_handler_t handler;
  84.     /** Argument for the handler. */
  85.     void *arg;
  86.  
  87.     /** Notification configuration structure. */
  88.     ipc_notif_cfg_t notif_cfg;
  89. };
  90.  
  91. extern void irq_init(count_t inrs, count_t chains);
  92. extern void irq_initialize(irq_t *irq);
  93. extern void irq_register(irq_t *irq);
  94. extern irq_t *irq_dispatch_and_lock(inr_t inr);
  95. extern irq_t *irq_find_and_lock(inr_t inr, devno_t devno);
  96.  
  97. #endif
  98.  
  99. /** @}
  100.  */
  101.