source: mainline/uspace/lib/c/generic/irc.c@ e5424e9

/*
 * Copyright (c) 2014 Jiri Svoboda
 * 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 libc
 * @{
 */
/** @file
 */

#include <assert.h>
#include <errno.h>
#include <ipc/irc.h>
#include <ipc/services.h>
#include <irc.h>
#include <ns.h>
#include <sysinfo.h>

static async_sess_t *irc_sess;

/** Connect to IRC service.
 *
 * @return      EOK on success, EIO on failure
 */
static int irc_init(void)
{
        sysarg_t apic;
        sysarg_t i8259;

        assert(irc_sess == NULL);

        if (((sysinfo_get_value("apic", &apic) == EOK) && (apic))
            || ((sysinfo_get_value("i8259", &i8259) == EOK) && (i8259))) {
                irc_sess = service_connect_blocking(EXCHANGE_SERIALIZE,
                    SERVICE_IRC, 0, 0);
        }

        if (irc_sess == NULL)
                return EIO;

        return EOK;
}

/** Enable interrupt.
 *
 * @param irq   IRQ number
 */
int irc_enable_interrupt(int irq)
{
        int rc;

        if (irc_sess == NULL) {
                rc = irc_init();
                if (rc != EOK)
                        return rc;
        }

        async_exch_t *exch = async_exchange_begin(irc_sess);
        rc = async_req_1_0(exch, IRC_ENABLE_INTERRUPT, irq);
        async_exchange_end(exch);

        return rc;
}


/** Disable interrupt.
 *
 * @param irq   IRQ number
 */
int irc_disable_interrupt(int irq)
{
        int rc;

        if (irc_sess == NULL) {
                rc = irc_init();
                if (rc != EOK)
                        return rc;
        }

        async_exch_t *exch = async_exchange_begin(irc_sess);
        rc = async_req_1_0(exch, IRC_CLEAR_INTERRUPT, irq);
        async_exchange_end(exch);

        return rc;
}

/** @}
 */