source: rtems/c/src/lib/libbsp/arm/shared/include/arm-cp15-start.h @ 936c8d6

/*
 * Copyright (c) 2009-2013 embedded brains GmbH.  All rights reserved.
 *
 *  embedded brains GmbH
 *  Dornierstr. 4
 *  82178 Puchheim
 *  Germany
 *  <info@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.com/license/LICENSE.
 */

#ifndef LIBBSP_ARM_SHARED_ARM_CP15_START_H
#define LIBBSP_ARM_SHARED_ARM_CP15_START_H

#include <libcpu/arm-cp15.h>

#include <bsp/start.h>

#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */

BSP_START_TEXT_SECTION static inline void
arm_cp15_set_domain_access_control(uint32_t val);

BSP_START_TEXT_SECTION static inline void
arm_cp15_set_translation_table_base(uint32_t *base);

BSP_START_TEXT_SECTION static inline void
arm_cp15_set_control(uint32_t val);

BSP_START_TEXT_SECTION static inline uint32_t
arm_cp15_get_control(void);

BSP_START_TEXT_SECTION static inline void
arm_cp15_cache_invalidate(void);

BSP_START_TEXT_SECTION static inline void
arm_cp15_tlb_invalidate(void);

typedef struct {
  uint32_t begin;
  uint32_t end;
  uint32_t flags;
} arm_cp15_start_section_config;

BSP_START_TEXT_SECTION static inline void
arm_cp15_start_set_translation_table_entries(
  uint32_t *ttb,
  const arm_cp15_start_section_config *config
)
{
  uint32_t i = ARM_MMU_SECT_GET_INDEX(config->begin);
  uint32_t iend =
    ARM_MMU_SECT_GET_INDEX(ARM_MMU_SECT_MVA_ALIGN_UP(config->end));

  if (config->begin != config->end) {
    while (i < iend) {
      ttb [i] = (i << ARM_MMU_SECT_BASE_SHIFT) | config->flags;
      ++i;
    }
  }
}

BSP_START_TEXT_SECTION static void
arm_cp15_start_setup_translation_table_and_enable_mmu(
  uint32_t ctrl,
  uint32_t *ttb,
  uint32_t client_domain,
  const arm_cp15_start_section_config *config_table,
  size_t config_count
)
{
  uint32_t dac = ARM_CP15_DAC_DOMAIN(client_domain, ARM_CP15_DAC_CLIENT);
  size_t i;

  arm_cp15_set_domain_access_control(dac);
  arm_cp15_set_translation_table_base(ttb);

  /* Initialize translation table with invalid entries */
  for (i = 0; i < ARM_MMU_TRANSLATION_TABLE_ENTRY_COUNT; ++i) {
    ttb [i] = 0;
  }

  for (i = 0; i < config_count; ++i) {
    arm_cp15_start_set_translation_table_entries(ttb, &config_table [i]);
  }

  /* Enable MMU and cache */
  ctrl |= ARM_CP15_CTRL_I | ARM_CP15_CTRL_C | ARM_CP15_CTRL_M;
  arm_cp15_set_control(ctrl);
}

BSP_START_TEXT_SECTION static inline uint32_t
arm_cp15_start_setup_mmu_and_cache(uint32_t ctrl_clear, uint32_t ctrl_set)
{
  uint32_t ctrl = arm_cp15_get_control();

  ctrl &= ~ctrl_clear;
  ctrl |= ctrl_set;

  arm_cp15_set_control(ctrl);

  arm_cp15_tlb_invalidate();

  return ctrl;
}

#ifdef __cplusplus
}
#endif /* __cplusplus */

#endif /* LIBBSP_ARM_SHARED_ARM_CP15_START_H */