source: rtems/bsps/arm/raspberrypi/start/bspstarthooks.c @ ba619b7f

/**
 * @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.  All rights reserved.
 *
 * 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/bootcard.h>
#include <bsp/linker-symbols.h>
#include <bsp/arm-cp15-start.h>

#include <rtems/sysinit.h>

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

#if defined(HAS_UBOOT) && !defined(BSP_DISABLE_UBOOT_WORK_AREA_CONFIG)
  #define USE_UBOOT
#endif

#ifdef USE_UBOOT
  #include <bsp/u-boot.h>
#else
  #include <bsp/vc.h>
#endif

BSP_START_DATA_SECTION static arm_cp15_start_section_config
raspberrypi_mmu_config_table[] = {
  ARMV7_CP15_START_DEFAULT_SECTIONS,
  {
    .begin = RPI_PERIPHERAL_BASE,
    .end =   RPI_PERIPHERAL_BASE + RPI_PERIPHERAL_SIZE,
    .flags = ARMV7_MMU_DEVICE
  }
#if (BSP_IS_RPI2 == 1)
  /* Core local peripherals area - timer, mailboxes */
  , {
    .begin = BCM2836_CORE_LOCAL_PERIPH_BASE,
    .end =   BCM2836_CORE_LOCAL_PERIPH_BASE + BCM2836_CORE_LOCAL_PERIPH_SIZE,
    .flags = ARMV7_MMU_DEVICE
  }
#endif
};

void BSP_START_TEXT_SECTION bsp_start_hook_0(void)
{
  /* Clear Translation Table Base Control Register */
  arm_cp15_set_translation_table_base_control_register(0);

#ifdef RTEMS_SMP
  if (_SMP_Get_current_processor() == 0) {
    rpi_ipi_initialize();
  } else {
    rpi_start_rtems_on_secondary_processor();
  }
#endif
}

BSP_START_TEXT_SECTION static uintptr_t raspberrypi_get_ram_end(void)
{
  uintptr_t ram_end;

#ifdef USE_UBOOT
  ram_end = (uintptr_t) bsp_uboot_board_info.bi_memstart +
                        bsp_uboot_board_info.bi_memsize;
#else
  bcm2835_get_arm_memory_entries spec;

  if (bcm2835_mailbox_get_arm_memory( &spec ) >= 0) {
    ram_end = spec.base + spec.size;
  } else {
    /* Use the workspace end from the linker command file for fallback. */
    ram_end = (uintptr_t) bsp_section_work_end;
  }
#endif

  return ram_end;
}

BSP_START_TEXT_SECTION static void bsp_memory_management_initialize(void)
{
  uintptr_t ram_end = raspberrypi_get_ram_end();
  uint32_t ctrl = arm_cp15_get_control();

  ctrl |= ARM_CP15_CTRL_AFE | ARM_CP15_CTRL_S | ARM_CP15_CTRL_XP;

  raspberrypi_mmu_config_table[ARMV7_CP15_START_WORKSPACE_ENTRY_INDEX].end =
    ram_end;

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

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();
}

static Memory_Area _Memory_Areas[1];

static void bsp_memory_initialize(void)
{
  _Memory_Initialize(
    &_Memory_Areas[0],
    (void *)
    raspberrypi_mmu_config_table[ARMV7_CP15_START_WORKSPACE_ENTRY_INDEX].begin,
    (void *)
    raspberrypi_mmu_config_table[ARMV7_CP15_START_WORKSPACE_ENTRY_INDEX].end
  );
}

RTEMS_SYSINIT_ITEM(
  bsp_memory_initialize,
  RTEMS_SYSINIT_MEMORY,
  RTEMS_SYSINIT_ORDER_MIDDLE
);

static const Memory_Information _Memory_Information =
  MEMORY_INFORMATION_INITIALIZER(_Memory_Areas);

const Memory_Information *_Memory_Get(void)
{
  return &_Memory_Information;
}