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