exception.c

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/* Basic functions for adding/removing custom exception handlers
 *
 * Copyright 2004-2009 Analog Devices Inc.
 *
 * Licensed under the GPL-2 or later
 */

#include <linux/module.h>
#include <asm/irq_handler.h>

int bfin_request_exception(unsigned int exception, void (*handler)(void))
{
    void (*curr_handler)(void);

    if (exception > 0x3F)
        return -EINVAL;

    curr_handler = ex_table[exception];

    if (curr_handler != ex_replaceable)
        return -EBUSY;

    ex_table[exception] = handler;

    return 0;
}
EXPORT_SYMBOL(bfin_request_exception);

int bfin_free_exception(unsigned int exception, void (*handler)(void))
{
    void (*curr_handler)(void);

    if (exception > 0x3F)
        return -EINVAL;

    curr_handler = ex_table[exception];

    if (curr_handler != handler)
        return -EBUSY;

    ex_table[exception] = ex_replaceable;

    return 0;
}
EXPORT_SYMBOL(bfin_free_exception);