| /* |
| * Copyright (c) 2017 Synopsys. |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| #include <device.h> |
| #include <init.h> |
| #include <kernel.h> |
| #include <soc.h> |
| #include <arch/arc/v2/mpu/arc_core_mpu.h> |
| #include <logging/sys_log.h> |
| |
| /* |
| * @brief Configure MPU for the thread |
| * |
| * This function configures per thread memory map reprogramming the MPU. |
| * |
| * @param thread thread info data structure. |
| */ |
| void configure_mpu_thread(struct k_thread *thread) |
| { |
| arc_core_mpu_disable(); |
| #if defined(CONFIG_MPU_STACK_GUARD) |
| configure_mpu_stack_guard(thread); |
| #endif |
| |
| #if defined(CONFIG_USERSPACE) |
| configure_mpu_user_context(thread); |
| configure_mpu_mem_domain(thread); |
| #endif |
| arc_core_mpu_enable(); |
| } |
| |
| #if defined(CONFIG_MPU_STACK_GUARD) |
| /* |
| * @brief Configure MPU stack guard |
| * |
| * This function configures per thread stack guards reprogramming the MPU. |
| * The functionality is meant to be used during context switch. |
| * |
| * @param thread thread info data structure. |
| */ |
| void configure_mpu_stack_guard(struct k_thread *thread) |
| { |
| #if defined(CONFIG_USERSPACE) |
| if (thread->thread_base.user_options & K_USER) { |
| /* the areas before and after the user stack of thread is |
| * kernel only. These area can be used as stack guard. |
| * ----------------------- |
| * | kernel only area | |
| * |---------------------| |
| * | user stack | |
| * |---------------------| |
| * |privilege stack guard| |
| * |---------------------| |
| * | privilege stack | |
| * ----------------------- |
| */ |
| arc_core_mpu_configure(THREAD_STACK_GUARD_REGION, |
| thread->arch.priv_stack_start - STACK_GUARD_SIZE, |
| STACK_GUARD_SIZE); |
| } |
| #endif |
| arc_core_mpu_configure(THREAD_STACK_GUARD_REGION, |
| thread->stack_info.start - STACK_GUARD_SIZE, |
| STACK_GUARD_SIZE); |
| |
| } |
| #endif |
| |
| #if defined(CONFIG_USERSPACE) |
| /* |
| * @brief Configure MPU user context |
| * |
| * This function configures the thread's user context. |
| * The functionality is meant to be used during context switch. |
| * |
| * @param thread thread info data structure. |
| */ |
| void configure_mpu_user_context(struct k_thread *thread) |
| { |
| SYS_LOG_DBG("configure user thread %p's context", thread); |
| arc_core_mpu_configure_user_context(thread); |
| } |
| |
| |
| /* |
| * @brief Configure MPU memory domain |
| * |
| * This function configures per thread memory domain reprogramming the MPU. |
| * The functionality is meant to be used during context switch. |
| * |
| * @param thread thread info data structure. |
| */ |
| void configure_mpu_mem_domain(struct k_thread *thread) |
| { |
| SYS_LOG_DBG("configure thread %p's domain", thread); |
| arc_core_mpu_configure_mem_domain(thread->mem_domain_info.mem_domain); |
| } |
| |
| int _arch_mem_domain_max_partitions_get(void) |
| { |
| return arc_core_mpu_get_max_domain_partition_regions(); |
| } |
| |
| /* |
| * Reset MPU region for a single memory partition |
| */ |
| void _arch_mem_domain_partition_remove(struct k_mem_domain *domain, |
| u32_t partition_id) |
| { |
| ARG_UNUSED(domain); |
| |
| arc_core_mpu_disable(); |
| arc_core_mpu_mem_partition_remove(partition_id); |
| arc_core_mpu_enable(); |
| |
| } |
| |
| /* |
| * Configure MPU memory domain |
| */ |
| void _arch_mem_domain_configure(struct k_thread *thread) |
| { |
| configure_mpu_mem_domain(thread); |
| } |
| |
| /* |
| * Destroy MPU regions for the mem domain |
| */ |
| void _arch_mem_domain_destroy(struct k_mem_domain *domain) |
| { |
| ARG_UNUSED(domain); |
| |
| arc_core_mpu_disable(); |
| arc_core_mpu_configure_mem_domain(NULL); |
| arc_core_mpu_enable(); |
| } |
| |
| /* |
| * Validate the given buffer is user accessible or not |
| */ |
| int _arch_buffer_validate(void *addr, size_t size, int write) |
| { |
| return arc_core_mpu_buffer_validate(addr, size, write); |
| } |
| |
| #endif |