source: rtems/c/src/lib/libbsp/arm/shared/arm-cp15-set-exception-handler.c @ 88cf23f

4.115
Last change on this file since 88cf23f was 88cf23f, checked in by Sebastian Huber <sebastian.huber@…>, on Apr 30, 2013 at 1:23:45 PM

bsps/arm: Add arm_cp15_set_exception_handler()

  • Property mode set to 100644
File size: 1.4 KB
Line 
1/*
2 * Copyright (c) 2013 embedded brains GmbH.  All rights reserved.
3 *
4 *  embedded brains GmbH
5 *  Dornierstr. 4
6 *  82178 Puchheim
7 *  Germany
8 *  <info@embedded-brains.de>
9 *
10 * The license and distribution terms for this file may be
11 * found in the file LICENSE in this distribution or at
12 * http://www.rtems.com/license/LICENSE.
13 */
14
15#include <libcpu/arm-cp15.h>
16
17#include <bsp/linker-symbols.h>
18
19void arm_cp15_set_exception_handler(
20  Arm_symbolic_exception_name exception,
21  void (*handler)(void),
22  uint32_t section_flags_for_mirror_table_access
23)
24{
25  if ((unsigned) exception < MAX_EXCEPTIONS) {
26    uint32_t *cpu_table = (uint32_t *) 0 + MAX_EXCEPTIONS;
27    uint32_t *mirror_table = (uint32_t *) bsp_vector_table_begin + MAX_EXCEPTIONS;
28    uint32_t current_handler = mirror_table[exception];
29
30    if (current_handler != (uint32_t) handler) {
31      size_t table_size = MAX_EXCEPTIONS * sizeof(uint32_t);
32      uint32_t cls = arm_cp15_get_min_cache_line_size();
33      uint32_t ctrl;
34      rtems_interrupt_level level;
35
36      rtems_interrupt_disable(level);
37
38      ctrl = arm_cp15_mmu_disable(cls);
39
40      mirror_table[exception] = (uint32_t) handler;
41      rtems_cache_flush_multiple_data_lines(mirror_table, table_size);
42      rtems_cache_invalidate_multiple_instruction_lines(cpu_table, table_size);
43
44      arm_cp15_set_control(ctrl);
45
46      rtems_interrupt_enable(level);
47    }
48  }
49}
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