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/*

 * Copyright (c) 2005 Ondrej Palkovsky

 * 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 genericinterrupt

 * @{

 */

/**

 * @file

 * @brief   Interrupt redirector.

 *

 * This file provides means of registering interrupt handlers

 * by kernel functions and calling the handlers when interrupts

 * occur.

 */

#include <interrupt.h>

#include <debug.h>

#include <console/kconsole.h>

#include <console/console.h>

#include <console/chardev.h>

#include <console/cmd.h>

#include <panic.h>

#include <print.h>

#include <symtab.h>

#include <tdebug/tdebug.h>

static struct {

    const char *name;

    iroutine f;

} exc_table[IVT_ITEMS];

SPINLOCK_INITIALIZE(exctbl_lock);

/** Register exception handler

 *

 * @param n Exception number

 * @param name Description

 * @param f Exception handler

 */

iroutine exc_register(int n, const char *name, iroutine f)

{

    ASSERT(n < IVT_ITEMS);

    iroutine old;

    spinlock_lock(&exctbl_lock);

    old = exc_table[n].f;

    exc_table[n].f = f;

    exc_table[n].name = name;

    spinlock_unlock(&exctbl_lock); 

    return old;

}

/** Dispatch exception according to exception table

 *

 * Called directly from the assembler code.

 * CPU is interrupts_disable()'d.

 */

void exc_dispatch(int n, istate_t *istate)

{

    ASSERT(n < IVT_ITEMS);

    if (THREAD && istate_from_uspace(istate)) {

        /* Record userspace state */

        THREAD->tdebug.uspace_state = istate;

    }

    exc_table[n].f(n + IVT_FIRST, istate);

    if (THREAD && istate_from_uspace(istate)) {

        /* Clear it again (mostly for dev. and debugging purposes) */

        THREAD->tdebug.uspace_state = NULL;

    }

    /* This is a safe place to exit exiting thread */

    if (THREAD && THREAD->interrupted && istate_from_uspace(istate))

        thread_exit();

}

/** Default 'null' exception handler */

static void exc_undef(int n, istate_t *istate)

{

    fault_if_from_uspace(istate, "Unhandled exception %d.", n);

    panic("Unhandled exception %d.", n);

}

/** kconsole cmd - print all exceptions */

static int exc_print_cmd(cmd_arg_t *argv)

{

#if (IVT_ITEMS > 0)

    unsigned int i;

    char *symbol;

    spinlock_lock(&exctbl_lock);

    if (sizeof(void *) == 4) {

        printf("Exc Description          Handler    Symbol\n");

        printf("--- -------------------- ---------- --------\n");

    } else {

        printf("Exc Description          Handler            Symbol\n");

        printf("--- -------------------- ------------------ --------\n");

    }

    for (i = 0; i < IVT_ITEMS; i++) {

        symbol = get_symtab_entry((unative_t) exc_table[i].f);

        if (!symbol)

            symbol = "not found";

        if (sizeof(void *) == 4)

            printf("%-3u %-20s %#10zx %s\n", i + IVT_FIRST, exc_table[i].name,

                exc_table[i].f, symbol);

        else

            printf("%-3u %-20s %#18zx %s\n", i + IVT_FIRST, exc_table[i].name,

                exc_table[i].f, symbol);

        if (((i + 1) % 20) == 0) {

            printf(" -- Press any key to continue -- ");

            spinlock_unlock(&exctbl_lock);

            getc(stdin);

            spinlock_lock(&exctbl_lock);

            printf("\n");

        }

    }

    spinlock_unlock(&exctbl_lock);

#endif

    return 1;

}

static cmd_info_t exc_info = {

    .name = "exc",

    .description = "Print exception table.",

    .func = exc_print_cmd,

    .help = NULL,

    .argc = 0,

    .argv = NULL

};

/** Initialize generic exception handling support */

void exc_init(void)

{

    int i;

    for (i=0;i < IVT_ITEMS; i++)

        exc_register(i, "undef", (iroutine) exc_undef);

    cmd_initialize(&exc_info);

    if (!cmd_register(&exc_info))

        panic("could not register command %s\n", exc_info.name);

}

/** @}

 */