forked from Imagelibrary/rtems
c5fd79cd47
Add NULL-pointer protection. Make MMU table read-only. Move vector table to start section. Close #3774.
124 lines
3.1 KiB
C
124 lines
3.1 KiB
C
/**
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* @file
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*
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* @ingroup arm_start
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*
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* @brief Rasberry Pi startup code.
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*/
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/*
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* Copyright (c) 2013. Hesham AL-Matary
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* Copyright (c) 2013 by Alan Cudmore
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* based on work by:
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* Copyright (c) 2009
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* embedded brains GmbH
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* Obere Lagerstr. 30
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* D-82178 Puchheim
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* Germany
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* <rtems@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 <bspopts.h>
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#include <bsp/start.h>
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#include <bsp/raspberrypi.h>
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#include <libcpu/arm-cp15.h>
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#include <bsp.h>
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#include <bsp/linker-symbols.h>
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#include <bsp/arm-cp15-start.h>
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#ifdef RTEMS_SMP
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#include <rtems/score/smp.h>
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#endif
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void BSP_START_TEXT_SECTION bsp_start_hook_0(void)
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{
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uint32_t sctlr_val;
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#ifdef RTEMS_SMP
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uint32_t cpu_index_self = _SMP_Get_current_processor();
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#endif /* RTEMS_SMP */
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sctlr_val = arm_cp15_get_control();
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/*
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* Current U-boot loader seems to start kernel image
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* with I and D caches on and MMU enabled.
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* If RTEMS application image finds that cache is on
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* during startup then disable caches.
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*/
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if (sctlr_val & (ARM_CP15_CTRL_I | ARM_CP15_CTRL_C | ARM_CP15_CTRL_M)) {
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if (sctlr_val & (ARM_CP15_CTRL_C | ARM_CP15_CTRL_M)) {
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/*
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* If the data cache is on then ensure that it is clean
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* before switching off to be extra carefull.
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*/
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#ifdef RTEMS_SMP
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if (cpu_index_self != 0) {
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arm_cp15_data_cache_clean_level(0);
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arm_cp15_cache_invalidate_level(0, 0);
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} else
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#endif /* RTEMS_SMP */
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{
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rtems_cache_flush_entire_data();
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rtems_cache_invalidate_entire_data();
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}
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}
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arm_cp15_flush_prefetch_buffer();
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sctlr_val &= ~(ARM_CP15_CTRL_I | ARM_CP15_CTRL_C | ARM_CP15_CTRL_M | ARM_CP15_CTRL_A);
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arm_cp15_set_control(sctlr_val);
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}
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#ifdef RTEMS_SMP
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if (cpu_index_self != 0) {
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arm_cp15_cache_invalidate_level(0, 0);
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} else
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#endif /* RTEMS_SMP */
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{
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rtems_cache_invalidate_entire_data();
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}
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rtems_cache_invalidate_entire_instruction();
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arm_cp15_branch_predictor_invalidate_all();
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arm_cp15_tlb_invalidate();
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arm_cp15_flush_prefetch_buffer();
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/* Clear Translation Table Base Control Register */
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arm_cp15_set_translation_table_base_control_register(0);
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/* Clear Secure or Non-secure Vector Base Address Register */
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arm_cp15_set_vector_base_address(bsp_vector_table_begin);
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#ifdef RTEMS_SMP
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if (cpu_index_self == 0) {
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rpi_ipi_initialize();
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} else {
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rpi_start_rtems_on_secondary_processor();
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}
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#endif
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}
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BSP_START_TEXT_SECTION static void bsp_memory_management_initialize(void)
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{
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uint32_t ctrl = arm_cp15_get_control();
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ctrl |= ARM_CP15_CTRL_AFE | ARM_CP15_CTRL_S | ARM_CP15_CTRL_XP;
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arm_cp15_start_setup_translation_table_and_enable_mmu_and_cache(
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ctrl,
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(uint32_t *) bsp_translation_table_base,
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ARM_MMU_DEFAULT_CLIENT_DOMAIN,
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&arm_cp15_start_mmu_config_table[0],
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arm_cp15_start_mmu_config_table_size
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);
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}
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void BSP_START_TEXT_SECTION bsp_start_hook_1(void)
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{
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bsp_start_copy_sections();
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bsp_memory_management_initialize();
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bsp_start_clear_bss();
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rpi_video_init();
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}
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