source: mainline/kernel/generic/include/ddi/irq.h

/*
 * Copyright (c) 2006 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - 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.
 * - 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.
 */

/** @addtogroup kernel_generic_ddi
 * @{
 */
/** @file
 */

#ifndef KERN_DDI_IRQ_H_
#define KERN_DDI_IRQ_H_

#include <typedefs.h>
#include <abi/ddi/irq.h>
#include <adt/list.h>
#include <adt/hash_table.h>
#include <synch/spinlock.h>
#include <proc/task.h>
#include <ipc/ipc.h>
#include <mm/slab.h>

typedef enum {
        IRQ_DECLINE,  /**< Decline to service. */
        IRQ_ACCEPT    /**< Accept to service. */
} irq_ownership_t;

typedef enum {
        IRQ_TRIGGER_LEVEL = 1,
        IRQ_TRIGGER_EDGE
} irq_trigger_t;

struct irq;

typedef void (*irq_handler_t)(struct irq *);

/** Type for function used to clear the interrupt. */
typedef void (*cir_t)(void *, inr_t);

/** IPC notification config structure.
 *
 * Primarily, this structure is encapsulated in the irq_t structure.
 * It is protected by irq_t::lock.
 *
 */
typedef struct {
        /** When false, notifications are not sent. */
        bool notify;
        /** True if the structure is in irq_uspace_hash_table_table */
        bool hashed_in;
        /** Answerbox for notifications. */
        answerbox_t *answerbox;
        /** Interface and method to be used for the notification. */
        sysarg_t imethod;
        /** Arguments that will be sent if the IRQ is claimed. */
        uint32_t scratch[IPC_CALL_LEN];
        /** Top-half IRQ code. */
        irq_code_t *code;
        /** Counter. */
        size_t counter;
} ipc_notif_cfg_t;

/** Structure representing one device IRQ.
 *
 * If one device has multiple interrupts, there will be multiple irq_t
 * instantions.
 */
typedef struct irq {
        /** Hash table link. */
        ht_link_t link;

        /** Lock protecting everything in this structure
         *  except the link member. When both the IRQ
         *  hash table lock and this lock are to be acquired,
         *  this lock must not be taken first.
         */
        IRQ_SPINLOCK_DECLARE(lock);

        /** Send EOI before processing the interrupt.
         *  This is essential for timer interrupt which
         *  has to be acknowledged before doing preemption
         *  to make sure another timer interrupt will
         *  be eventually generated.
         */
        bool preack;

        /** Actual IRQ number. -1 if not yet assigned. */
        inr_t inr;
        /** Trigger level of the IRQ. */
        irq_trigger_t trigger;
        /** Claim ownership of the IRQ. */
        irq_ownership_t (*claim)(struct irq *);
        /** Handler for this IRQ and device. */
        irq_handler_t handler;
        /** Instance argument for the handler and the claim function. */
        void *instance;

        /** Clear interrupt routine. */
        cir_t cir;
        /** First argument to the clear interrupt routine. */
        void *cir_arg;

        /** Notification configuration structure. */
        ipc_notif_cfg_t notif_cfg;
} irq_t;

IRQ_SPINLOCK_EXTERN(irq_uspace_hash_table_lock);
extern hash_table_t irq_uspace_hash_table;

extern slab_cache_t *irq_cache;

extern inr_t last_inr;

extern void irq_init(size_t, size_t);
extern void irq_initialize(irq_t *);
extern void irq_register(irq_t *);
extern irq_t *irq_dispatch_and_lock(inr_t);

#endif

/** @}
 */