diff options
Diffstat (limited to 'bsps/arm/shared/cp15/arm-cp15-set-exception-handler.c')
-rw-r--r-- | bsps/arm/shared/cp15/arm-cp15-set-exception-handler.c | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/bsps/arm/shared/cp15/arm-cp15-set-exception-handler.c b/bsps/arm/shared/cp15/arm-cp15-set-exception-handler.c new file mode 100644 index 0000000000..b24b7c4eb0 --- /dev/null +++ b/bsps/arm/shared/cp15/arm-cp15-set-exception-handler.c @@ -0,0 +1,56 @@ +/* + * Copyright (c) 2013 embedded brains GmbH. All rights reserved. + * + * embedded brains GmbH + * Dornierstr. 4 + * 82178 Puchheim + * Germany + * <info@embedded-brains.de> + * + * The license and distribution terms for this file may be + * found in the file LICENSE in this distribution or at + * http://www.rtems.org/license/LICENSE. + */ + +#include <libcpu/arm-cp15.h> + +#include <bsp/linker-symbols.h> + +void arm_cp15_set_exception_handler( + Arm_symbolic_exception_name exception, + void (*handler)(void) +) +{ + if ((unsigned) exception < MAX_EXCEPTIONS) { + uint32_t *cpu_table = (uint32_t *) 0 + MAX_EXCEPTIONS; + uint32_t *mirror_table = (uint32_t *) bsp_vector_table_begin + MAX_EXCEPTIONS; + uint32_t current_handler = mirror_table[exception]; + + if (current_handler != (uint32_t) handler) { + size_t table_size = MAX_EXCEPTIONS * sizeof(uint32_t); + uint32_t cls = arm_cp15_get_min_cache_line_size(); + uint32_t ctrl; + rtems_interrupt_level level; + + rtems_interrupt_local_disable(level); + + ctrl = arm_cp15_mmu_disable(cls); + + mirror_table[exception] = (uint32_t) handler; + + rtems_cache_flush_multiple_data_lines(mirror_table, table_size); + + /* + * On ARMv7 processors with the Security Extension the mirror table might + * be the actual table used by the processor. + */ + rtems_cache_invalidate_multiple_instruction_lines(mirror_table, table_size); + + rtems_cache_invalidate_multiple_instruction_lines(cpu_table, table_size); + + arm_cp15_set_control(ctrl); + + rtems_interrupt_local_enable(level); + } + } +} |