arch/blackfin/kernel/exception.c

   1 /* Basic functions for adding/removing custom exception handlers
   2  *
   3  * Copyright 2004-2009 Analog Devices Inc.
   4  *
   5  * Licensed under the GPL-2 or later
   6  */
   7
   8 #include <linux/module.h>
   9 #include <asm/irq_handler.h>
  10
  11 int bfin_request_exception(unsigned int exception, void (*handler)(void))
  12 {
  13         void (*curr_handler)(void);
  14
  15         if (exception > 0x3F)
  16                 return -EINVAL;
  17
  18         curr_handler = ex_table[exception];
  19
  20         if (curr_handler != ex_replaceable)
  21                 return -EBUSY;
  22
  23         ex_table[exception] = handler;
  24
  25         return 0;
  26 }
  27 EXPORT_SYMBOL(bfin_request_exception);
  28
  29 int bfin_free_exception(unsigned int exception, void (*handler)(void))
  30 {
  31         void (*curr_handler)(void);
  32
  33         if (exception > 0x3F)
  34                 return -EINVAL;
  35
  36         curr_handler = ex_table[exception];
  37
  38         if (curr_handler != handler)
  39                 return -EBUSY;
  40
  41         ex_table[exception] = ex_replaceable;
  42
  43         return 0;
  44 }
  45 EXPORT_SYMBOL(bfin_free_exception);