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575 palkovsky 1 
/*
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 * Copyright (C) 2005 Ondrej Palkovsky
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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1264 jermar 29 
/**
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 * @file    interrupt.c
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 * @brief   Interrupt redirector.
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 *
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 * This file provides means of registering interrupt handlers
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 * by kernel functions and calling the handlers when interrupts
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 * occur.
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 */
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575 palkovsky 38 
#include <interrupt.h>
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#include <debug.h>
578 palkovsky 40 
#include <console/kconsole.h>
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#include <console/console.h>
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#include <console/chardev.h>
673 jermar 43 
#include <console/cmd.h>
578 palkovsky 44 
#include <panic.h>
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#include <print.h>
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#include <symtab.h>
575 palkovsky 47 
 
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static struct {
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    const char *name;
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    iroutine f;
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} exc_table[IVT_ITEMS];
575 palkovsky 52 
 
623 jermar 53 
SPINLOCK_INITIALIZE(exctbl_lock);
578 palkovsky 54 
 
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/** Register exception handler
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 *
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 * @param n Exception number
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 * @param name Description
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 * @param f Exception handler
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 */
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iroutine exc_register(int n, const char *name, iroutine f)
575 palkovsky 62 
{
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    ASSERT(n < IVT_ITEMS);
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    iroutine old;
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578 palkovsky 67 
    spinlock_lock(&exctbl_lock);
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    old = exc_table[n].f;
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    exc_table[n].f = f;
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    exc_table[n].name = name;
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    spinlock_unlock(&exctbl_lock); 
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575 palkovsky 75 
    return old;
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}
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578 palkovsky 78 
/** Dispatch exception according to exception table
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 *
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 * Called directly from the assembler code.
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 * CPU is interrupts_disable()'d.
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 */
958 jermar 83 
void exc_dispatch(int n, istate_t *istate)
575 palkovsky 84 
{
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    ASSERT(n < IVT_ITEMS);
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958 jermar 87 
    exc_table[n].f(n + IVT_FIRST, istate);
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    /* This is a safe place to exit exiting thread */
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    if (THREAD && THREAD->interrupted && istate_from_uspace(istate))
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        thread_exit();
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}
578 palkovsky 92 
 
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/** Default 'null' exception handler */
958 jermar 94 
static void exc_undef(int n, istate_t *istate)
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{
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    fault_if_from_uspace(istate, "Unhandled exception %d.", n);
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    panic("Unhandled exception %d.", n);
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}
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664 jermar 100 
/** kconsole cmd - print all exceptions */
578 palkovsky 101 
static int exc_print_cmd(cmd_arg_t *argv)
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{
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    int i;
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    char *symbol;
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    spinlock_lock(&exctbl_lock);
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    printf("Exc Description Handler\n");
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    for (i=0; i < IVT_ITEMS; i++) {
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        symbol = get_symtab_entry((__native)exc_table[i].f);
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        if (!symbol)
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            symbol = "not found";
1224 cejka 112 
        printf("%d %s %.*p(%s)\n", i + IVT_FIRST, exc_table[i].name,
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               sizeof(__address) * 2, exc_table[i].f,symbol);      
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        if (!((i+1) % 20)) {
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            printf("Press any key to continue.");
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            spinlock_unlock(&exctbl_lock);
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            getc(stdin);
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            spinlock_lock(&exctbl_lock);
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            printf("\n");
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        }
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    }
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    spinlock_unlock(&exctbl_lock);
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    return 1;
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}
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static cmd_info_t exc_info = {
673 jermar 128 
    .name = "exc",
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    .description = "Print exception table.",
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    .func = exc_print_cmd,
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    .help = NULL,
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    .argc = 0,
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    .argv = NULL
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};
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/** Initialize generic exception handling support */
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void exc_init(void)
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{
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    int i;
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    for (i=0;i < IVT_ITEMS; i++)
958 jermar 142 
        exc_register(i, "undef", (iroutine) exc_undef);
578 palkovsky 143 
 
673 jermar 144 
    cmd_initialize(&exc_info);
578 palkovsky 145 
    if (!cmd_register(&exc_info))
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        panic("could not register command %s\n", exc_info.name);
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}
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