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/*

 * Copyright (C) 2003-2004 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.

 */

#include <arch/interrupt.h>

#include <arch/types.h>

#include <arch.h>

#include <arch/cp0.h>

#include <time/clock.h>

#include <panic.h>

#include <print.h>

#include <symtab.h>

#include <arch/drivers/arc.h>

#include <arch/drivers/keyboard.h>

static void print_regdump(struct exception_regdump *pstate)

{

    char *pcsymbol = "";

    char *rasymbol = "";

    char *s = get_symtab_entry(pstate->epc);

    if (s)

        pcsymbol = s;

    s = get_symtab_entry(pstate->ra);

    if (s)

        rasymbol = s;

    printf("PC: %X(%s) RA: %X(%s)\n",pstate->epc,pcsymbol,

           pstate->ra,rasymbol);

}

/** Disable interrupts.

 *

 * @return Old interrupt priority level.

 */

ipl_t interrupts_disable(void)

{

    ipl_t ipl = (ipl_t) cp0_status_read();

    cp0_status_write(ipl & ~cp0_status_ie_enabled_bit);

    return ipl;

}

/** Enable interrupts.

 *

 * @return Old interrupt priority level.

 */

ipl_t interrupts_enable(void)

{

    ipl_t ipl = (ipl_t) cp0_status_read();

    cp0_status_write(ipl | cp0_status_ie_enabled_bit);

    return ipl;

}

/** Restore interrupt priority level.

 *

 * @param ipl Saved interrupt priority level.

 */

void interrupts_restore(ipl_t ipl)

{

    cp0_status_write(cp0_status_read() | (ipl & cp0_status_ie_enabled_bit));

}

/** Read interrupt priority level.

 *

 * @return Current interrupt priority level.

 */

ipl_t interrupts_read(void)

{

    return cp0_status_read();

}

void interrupt(struct exception_regdump *pstate)

{

    __u32 cause;

    int i;

    /* decode interrupt number and process the interrupt */

    cause = (cp0_cause_read() >> 8) &0xff;

    for (i = 0; i < 8; i++) {

        if (cause & (1 << i)) {

            switch (i) {

                case 0: /* SW0 - Software interrupt 0 */

                    cp0_cause_write(cp0_cause_read() & ~(1 << 8)); /* clear SW0 interrupt */

                    break;

                case 1: /* SW1 - Software interrupt 1 */

                    cp0_cause_write(cp0_cause_read() & ~(1 << 9)); /* clear SW1 interrupt */

                    break;

                case 2: /* IRQ0 */

                case KEYBOARD_IRQ:

                    keyboard();

                    break;

                case 4: /* IRQ2 */

                case 5: /* IRQ3 */

                case 6: /* IRQ4 */

                default:

                    print_regdump(pstate);

                    panic("unhandled interrupt %d\n", i);

                    break;

                case TIMER_IRQ:

                    /* clear timer interrupt & set new */

                    cp0_compare_write(cp0_count_read() + cp0_compare_value);

                    clock();

                    break;

            }

        }

    }

}