modified parameter types to receive a const pointer when a non-const pointer is not needed Signed-off-by: Hess Nathan <nhess@baumer.com>
288 lines
7 KiB
C
288 lines
7 KiB
C
/*
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* Copyright (c) 2021 Synopsys.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#ifndef ZEPHYR_ARCH_ARC_CORE_MPU_ARC_MPU_COMMON_INTERNAL_H_
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#define ZEPHYR_ARCH_ARC_CORE_MPU_ARC_MPU_COMMON_INTERNAL_H_
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#if CONFIG_ARC_MPU_VER == 2 || CONFIG_ARC_MPU_VER == 3
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#include "arc_mpu_v2_internal.h"
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#elif CONFIG_ARC_MPU_VER == 6
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#include "arc_mpu_v6_internal.h"
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#else
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#error "Unsupported MPU version"
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#endif
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/**
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* @brief configure the base address and size for an MPU region
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*
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* @param type MPU region type
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* @param base base address in RAM
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* @param size size of the region
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*/
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static inline int _mpu_configure(uint8_t type, uint32_t base, uint32_t size)
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{
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int32_t region_index = get_region_index_by_type(type);
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uint32_t region_attr = get_region_attr_by_type(type);
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LOG_DBG("Region info: 0x%x 0x%x", base, size);
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if (region_attr == 0U || region_index < 0) {
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return -EINVAL;
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}
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/*
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* For ARC MPU, MPU regions can be overlapped, smaller
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* region index has higher priority.
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*/
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_region_init(region_index, base, size, region_attr);
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return 0;
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}
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/* ARC Core MPU Driver API Implementation for ARC MP */
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/**
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* @brief enable the MPU
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*/
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void arc_core_mpu_enable(void)
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{
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/* Enable MPU */
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z_arc_v2_aux_reg_write(_ARC_V2_MPU_EN,
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z_arc_v2_aux_reg_read(_ARC_V2_MPU_EN) | AUX_MPU_EN_ENABLE);
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}
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/**
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* @brief disable the MPU
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*/
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void arc_core_mpu_disable(void)
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{
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/* Disable MPU */
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z_arc_v2_aux_reg_write(_ARC_V2_MPU_EN,
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z_arc_v2_aux_reg_read(_ARC_V2_MPU_EN) & AUX_MPU_EN_DISABLE);
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}
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/**
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* @brief configure the thread's MPU regions
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*
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* @param thread the target thread
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*/
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void arc_core_mpu_configure_thread(struct k_thread *thread)
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{
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#if defined(CONFIG_USERSPACE)
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/* configure stack region of user thread */
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if (thread->base.user_options & K_USER) {
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LOG_DBG("configure user thread %p's stack", thread);
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if (_mpu_configure(THREAD_STACK_USER_REGION,
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(uint32_t)thread->stack_info.start,
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thread->stack_info.size) < 0) {
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LOG_ERR("user thread %p's stack failed", thread);
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return;
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}
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}
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LOG_DBG("configure thread %p's domain", thread);
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arc_core_mpu_configure_mem_domain(thread);
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#endif
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}
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/**
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* @brief configure the default region
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*
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* @param region_attr region attribute of default region
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*/
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void arc_core_mpu_default(uint32_t region_attr)
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{
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uint32_t val = z_arc_v2_aux_reg_read(_ARC_V2_MPU_EN) & (~AUX_MPU_RDP_ATTR_MASK);
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region_attr &= AUX_MPU_RDP_ATTR_MASK;
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z_arc_v2_aux_reg_write(_ARC_V2_MPU_EN, region_attr | val);
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}
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/**
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* @brief configure the MPU region
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*
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* @param index MPU region index
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* @param base base address
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* @param region_attr region attribute
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*/
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int arc_core_mpu_region(uint32_t index, uint32_t base, uint32_t size, uint32_t region_attr)
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{
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if (index >= get_num_regions()) {
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return -EINVAL;
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}
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region_attr &= AUX_MPU_RDP_ATTR_MASK;
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_region_init(index, base, size, region_attr);
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return 0;
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}
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#if defined(CONFIG_USERSPACE)
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/**
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* @brief configure MPU regions for the memory partitions of the memory domain
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*
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* @param thread the thread which has memory domain
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*/
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void arc_core_mpu_configure_mem_domain(struct k_thread *thread)
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{
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int region_index = get_region_index_by_type(THREAD_DOMAIN_PARTITION_REGION);
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uint32_t num_partitions;
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struct k_mem_partition *pparts;
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struct k_mem_domain *mem_domain = NULL;
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if (thread) {
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mem_domain = thread->mem_domain_info.mem_domain;
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}
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if (mem_domain) {
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LOG_DBG("configure domain: %p", mem_domain);
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num_partitions = mem_domain->num_partitions;
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pparts = mem_domain->partitions;
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} else {
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LOG_DBG("disable domain partition regions");
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num_partitions = 0U;
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pparts = NULL;
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}
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for (; region_index >= 0; region_index--) {
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if (num_partitions) {
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LOG_DBG("set region 0x%x 0x%lx 0x%x",
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region_index, pparts->start, pparts->size);
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_region_init(region_index, pparts->start, pparts->size, pparts->attr);
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num_partitions--;
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} else {
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/* clear the left mpu entries */
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_region_init(region_index, 0, 0, 0);
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}
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pparts++;
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}
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}
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/**
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* @brief remove MPU regions for the memory partitions of the memory domain
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*
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* @param mem_domain the target memory domain
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*/
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void arc_core_mpu_remove_mem_domain(struct k_mem_domain *mem_domain)
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{
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ARG_UNUSED(mem_domain);
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int region_index = get_region_index_by_type(THREAD_DOMAIN_PARTITION_REGION);
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for (; region_index >= 0; region_index--) {
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_region_init(region_index, 0, 0, 0);
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}
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}
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/**
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* @brief reset MPU region for a single memory partition
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*
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* @param domain the target memory domain
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* @param partition_id memory partition id
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*/
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void arc_core_mpu_remove_mem_partition(struct k_mem_domain *domain, uint32_t part_id)
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{
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ARG_UNUSED(domain);
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int region_index = get_region_index_by_type(THREAD_DOMAIN_PARTITION_REGION);
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LOG_DBG("disable region 0x%x", region_index + part_id);
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/* Disable region */
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_region_init(region_index + part_id, 0, 0, 0);
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}
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/**
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* @brief get the maximum number of free regions for memory domain partitions
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*/
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int arc_core_mpu_get_max_domain_partition_regions(void)
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{
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return get_region_index_by_type(THREAD_DOMAIN_PARTITION_REGION) + 1;
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}
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/**
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* @brief validate the given buffer is user accessible or not
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*/
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int arc_core_mpu_buffer_validate(const void *addr, size_t size, int write)
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{
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/*
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* For ARC MPU, smaller region number takes priority.
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* we can stop the iteration immediately once we find the
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* matched region that grants permission or denies access.
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*
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*/
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for (int r_index = 0; r_index < get_num_regions(); r_index++) {
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if (!_is_enabled_region(r_index) || !_is_in_region(r_index, (uint32_t)addr, size)) {
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continue;
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}
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if (_is_user_accessible_region(r_index, write)) {
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return 0;
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} else {
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return -EPERM;
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}
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}
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return -EPERM;
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}
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#endif /* CONFIG_USERSPACE */
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/* ARC MPU Driver Initial Setup */
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/*
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* @brief MPU default initialization and configuration
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*
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* This function provides the default configuration mechanism for the Memory
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* Protection Unit (MPU).
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*/
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static int arc_mpu_init(void)
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{
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uint32_t num_regions = get_num_regions();
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if (mpu_config.num_regions > num_regions) {
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__ASSERT(0, "Request to configure: %u regions (supported: %u)\n",
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mpu_config.num_regions, num_regions);
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return -EINVAL;
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}
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/* Disable MPU */
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arc_core_mpu_disable();
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/*
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* the MPU regions are filled in the reverse order.
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* According to ARCv2 ISA, the MPU region with smaller
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* index has higher priority. The static background MPU
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* regions in mpu_config will be in the bottom. Then
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* the special type regions will be above.
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*/
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int r_index = num_regions - mpu_config.num_regions;
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/* clear all the regions first */
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for (uint32_t i = 0U; i < r_index; i++) {
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_region_init(i, 0, 0, 0);
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}
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/* configure the static regions */
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for (uint32_t i = 0U; i < mpu_config.num_regions; i++) {
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_region_init(r_index, mpu_config.mpu_regions[i].base,
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mpu_config.mpu_regions[i].size, mpu_config.mpu_regions[i].attr);
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r_index++;
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}
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/* default region: no read, write and execute */
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arc_core_mpu_default(0);
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/* Enable MPU */
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arc_core_mpu_enable();
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return 0;
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}
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SYS_INIT(arc_mpu_init, PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT);
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#endif /* ZEPHYR_ARCH_ARC_CORE_MPU_ARC_MPU_COMMON_INTERNAL_H_ */
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