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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>

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);
    
    exc_table[n].f(n + IVT_FIRST, istate);
    /* 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)
{
    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 %-12s %#10zx %s\n", i + IVT_FIRST, exc_table[i].name,
                exc_table[i].f, symbol);
        else
            printf("%-3u %-12s %#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);
    
    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);
}

/** @}
 */