MIPS: Don't overflow cevt-r4k.c calculations at high clock rates.
[linux-2.6.git] / 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);