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1919 jermar 1
/*
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 * Copyright (C) 2006 Jakub Jermar
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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1920 jermar 29
/** @addtogroup genericddi
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 * @{
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 */
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/** @file
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 */
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#ifndef KERN_IRQ_H_
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#define KERN_IRQ_H_
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#include <arch/types.h>
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#include <adt/list.h>
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#include <ipc/ipc.h>
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#include <ipc/irq.h>
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#include <atomic.h>
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#include <synch/spinlock.h>
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typedef enum {
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	IRQ_DECLINE,		/**< Decline to service. */
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	IRQ_ACCEPT		/**< Accept to service. */
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} irq_ownership_t;
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typedef enum {
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	IRQ_TRIGGER_LEVEL = 1,
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	IRQ_TRIGGER_EDGE
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} irq_trigger_t;
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typedef struct irq irq_t;
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typedef void (* irq_handler_t)(irq_t *irq, void *arg, ...);
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/** Structure representing one device IRQ.
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 *
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 * If one device has multiple interrupts, there will
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 * be multiple irq_t instantions with the same
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 * devno.
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 */
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struct irq {
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	/** Hash table link. */
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	link_t link;
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	/** Lock protecting everything in this structure
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	 *  except the link member. When both the IRQ
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	 *  hash table lock and this lock are to be acquired,
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	 *  this lock must not be taken first.
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	 */
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	SPINLOCK_DECLARE(lock);
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	/** Unique device number. -1 if not yet assigned. */
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	devno_t devno;
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	/** Actual IRQ number. -1 if not yet assigned. */
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	inr_t inr;
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	/** Trigger level of the IRQ.*/
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	irq_trigger_t trigger;
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	/** Claim ownership of the IRQ. */
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	irq_ownership_t (* claim)(void);
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	/** Handler for this IRQ and device. */
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	irq_handler_t handler;
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	/** Argument for the handler. */
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	void *arg;
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	/** Answerbox of the task that wanted to be notified. */
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	answerbox_t *notif_answerbox;
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	/** Pseudo-code to be performed by the top-half
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	 *  before a notification is sent. */
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	irq_code_t *code;
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	/** Counter of IRQ notifications. */
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	atomic_t counter;
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};
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extern void irq_init(count_t inrs, count_t chains);
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extern void irq_initialize(irq_t *irq);
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extern void irq_register(irq_t *irq);
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extern irq_t *irq_dispatch(inr_t inr);
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#endif
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/** @}
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 */