source: rtems/bsps/arm/realview-pbx-a9/start/bspstarthooks.c

/* SPDX-License-Identifier: BSD-2-Clause */

/*
 * Copyright (c) 2013 embedded brains GmbH & Co. KG
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#define ARM_CP15_TEXT_SECTION BSP_START_TEXT_SECTION

#include <bsp.h>
#include <bsp/start.h>
#include <bsp/arm-cp15-start.h>
#include <bsp/arm-a9mpcore-start.h>

#ifdef RTEMS_SMP
#include <rtems/score/smpimpl.h>
#endif

BSP_START_DATA_SECTION static const arm_cp15_start_section_config
rvpbxa9_mmu_config_table[] = {
  ARMV7_CP15_START_DEFAULT_SECTIONS,
  {
    .begin = 0x10000000U,
    .end = 0x10020000U,
    .flags = ARMV7_MMU_DEVICE
  }, {
    .begin = 0x1f000000U,
    .end = 0x20000000U,
    .flags = ARMV7_MMU_DEVICE
  }, {
    .begin = 0x4e000000U,
    .end = 0x4f000000U,
    .flags = ARMV7_MMU_DEVICE
  }
};

BSP_START_TEXT_SECTION static void setup_mmu_and_cache(void)
{
  uint32_t ctrl = arm_cp15_start_setup_mmu_and_cache(
    ARM_CP15_CTRL_A,
    ARM_CP15_CTRL_AFE | ARM_CP15_CTRL_Z
  );

  arm_cp15_start_setup_translation_table_and_enable_mmu_and_cache(
    ctrl,
    (uint32_t *) bsp_translation_table_base,
    ARM_MMU_DEFAULT_CLIENT_DOMAIN,
    &rvpbxa9_mmu_config_table[0],
    RTEMS_ARRAY_SIZE(rvpbxa9_mmu_config_table)
  );
}

BSP_START_TEXT_SECTION void bsp_start_hook_0(void)
{
#ifdef RTEMS_SMP
  uint32_t cpu_index_self = _SMP_Get_current_processor();

  /*
   * QEMU jumps to the entry point of the ELF file on all processors.  Prevent
   * the fatal errors SMP_FATAL_MULTITASKING_START_ON_INVALID_PROCESSOR and
   * SMP_FATAL_MULTITASKING_START_ON_UNASSIGNED_PROCESSOR this way.
   */
  if (cpu_index_self != 0 && !_SMP_Should_start_processor(cpu_index_self)) {
    while (true) {
      _ARM_Wait_for_event();
    }
  }
#endif

  arm_a9mpcore_start_hook_0();
}

BSP_START_TEXT_SECTION void bsp_start_hook_1(void)
{
  arm_a9mpcore_start_hook_1();
  bsp_start_copy_sections();
  setup_mmu_and_cache();
  bsp_start_clear_bss();
}