forked from Imagelibrary/rtems
62 lines
1.6 KiB
C
62 lines
1.6 KiB
C
/*
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* Copyright (c) 2013 embedded brains GmbH. All rights reserved.
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*
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* embedded brains GmbH
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* Dornierstr. 4
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* 82178 Puchheim
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* Germany
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* <info@embedded-brains.de>
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.org/license/LICENSE.
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*/
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#include <libcpu/arm-cp15.h>
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#include <bsp/linker-symbols.h>
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void* arm_cp15_set_exception_handler(
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Arm_symbolic_exception_name exception,
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void (*handler)(void)
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)
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{
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uint32_t current_handler = 0;
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if ((unsigned) exception < MAX_EXCEPTIONS) {
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uint32_t *cpu_table = (uint32_t *) 0 + MAX_EXCEPTIONS;
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uint32_t *mirror_table = (uint32_t *) bsp_vector_table_begin + MAX_EXCEPTIONS;
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current_handler = mirror_table[exception];
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if (current_handler != (uint32_t) handler) {
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size_t table_size = MAX_EXCEPTIONS * sizeof(uint32_t);
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uint32_t cls = arm_cp15_get_min_cache_line_size();
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uint32_t ctrl;
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rtems_interrupt_level level;
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rtems_interrupt_local_disable(level);
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ctrl = arm_cp15_mmu_disable(cls);
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mirror_table[exception] = (uint32_t) handler;
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rtems_cache_flush_multiple_data_lines(mirror_table, table_size);
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/*
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* On ARMv7 processors with the Security Extension the mirror table might
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* be the actual table used by the processor.
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*/
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rtems_cache_invalidate_multiple_instruction_lines(mirror_table, table_size);
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rtems_cache_invalidate_multiple_instruction_lines(cpu_table, table_size);
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arm_cp15_set_control(ctrl);
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rtems_interrupt_local_enable(level);
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}
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}
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return (void*) current_handler;
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}
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