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/*
* Copyright (c) 2006-2023, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2023-09-25 tangzz98 the first version
*/
#include "mprotect.h"
#define DBG_ENABLE
#define DBG_SECTION_NAME "MEMORY PROTECTION"
#define DBG_LEVEL DBG_ERROR
#include <rtdbg.h>
rt_mem_exclusive_region_t exclusive_regions[NUM_EXCLUSIVE_REGIONS] = {};
rt_mem_region_t *rt_mprotect_find_free_region(rt_thread_t thread)
{
rt_uint8_t i;
rt_mem_region_t *free_region = RT_NULL;
if (thread->mem_regions != RT_NULL)
{
for (i = 0U; i < NUM_DYNAMIC_REGIONS; i++)
{
if (((rt_mem_region_t *)thread->mem_regions)[i].size == 0)
{
free_region = &(((rt_mem_region_t *)thread->mem_regions)[i]);
break;
}
}
}
return free_region;
}
rt_mem_region_t *rt_mprotect_find_region(rt_thread_t thread, rt_mem_region_t *region)
{
rt_uint8_t i;
rt_mem_region_t *found_region = RT_NULL;
if (thread->mem_regions != RT_NULL)
{
for (i = 0U; i < NUM_DYNAMIC_REGIONS; i++)
{
if ((((rt_mem_region_t *)thread->mem_regions)[i].start == region->start) && (((rt_mem_region_t *)thread->mem_regions)[i].size == region->size))
{
found_region = &(((rt_mem_region_t *)thread->mem_regions)[i]);
break;
}
}
}
return found_region;
}
/**
* @brief This function will initialize memory protection.
*
* @return Return the operation status. When the return value is RT_EOK, the initialization is successful.
* When the return value is any other values, it means the initialization failed.
*/
int rt_mprotect_init(void)
{
return (int)rt_hw_mpu_init();
}
/**
* @brief The function will add a memory region configuraiton for a thread.
*
* @param thread is the thread that the memory region configuration will apply to.
*
* @param region is the configuration for the memory region to add.
*
* @return Return the operation status. When the return value is RT_EOK, the operation is successful.
* If the return value is any other values, it represents the operation failed.
*/
rt_err_t rt_mprotect_add_region(rt_thread_t thread, rt_mem_region_t *region)
{
if (thread == RT_NULL)
{
thread = rt_thread_self();
}
if (thread->mem_regions == RT_NULL)
{
thread->mem_regions = RT_KERNEL_MALLOC(NUM_DYNAMIC_REGIONS * sizeof(rt_mem_region_t));
if (thread->mem_regions == RT_NULL)
{
return RT_ERROR;
}
rt_memset(thread->mem_regions, 0U, sizeof(rt_mem_region_t ) * NUM_DYNAMIC_REGIONS);
}
return rt_hw_mpu_add_region(thread, region);
}
/**
* @brief The function will delete an existing memory region configuraiton for a thread.
*
* @param thread is the thread that the memory region configuration will apply to.
*
* @param region is the configuration for the memory region to delete.
*
* @return Return the operation status. When the return value is RT_EOK, the operation is successful.
* If the return value is any other values, it represents the operation failed.
*/
rt_err_t rt_mprotect_delete_region(rt_thread_t thread, rt_mem_region_t *region)
{
if (thread == RT_NULL)
{
thread = rt_thread_self();
}
return rt_hw_mpu_delete_region(thread, region);
}
/**
* @brief The function will update an existing memory region configuraiton for a thread.
*
* @param thread is the thread that the memory region configuration will apply to.
*
* @param region is the new configuration for the memory region.
*
* @return Return the operation status. When the return value is RT_EOK, the operation is successful.
* If the return value is any other values, it represents the operation failed.
*/
rt_err_t rt_mprotect_update_region(rt_thread_t thread, rt_mem_region_t *region)
{
if (thread == RT_NULL)
{
thread = rt_thread_self();
}
return rt_hw_mpu_update_region(thread, region);
}
/**
* @brief The function will add a memory region that is only accessible by the calling thread.
*
* @param start is the start address of the memory region.
*
* @param size is the size of the memory region.
*
* @return Return the operation status. When the return value is RT_EOK, the operation is successful.
* If the return value is any other values, it represents the operation failed.
*/
rt_err_t rt_mprotect_add_exclusive_region(void *start, rt_size_t size)
{
rt_uint8_t i;
rt_mem_exclusive_region_t region;
region.owner = rt_thread_self();
region.region.start = start;
region.region.size = size;
region.region.attr = RT_MEM_REGION_P_NA_U_NA;
if (rt_hw_mpu_add_region(RT_NULL, (rt_mem_region_t *)(&(region.region))) != RT_EOK)
{
return RT_ERROR;
}
rt_enter_critical();
for (i = 0; i < NUM_EXCLUSIVE_REGIONS; i++)
{
if (exclusive_regions[i].owner == RT_NULL)
{
rt_memcpy(&(exclusive_regions[i]), ®ion, sizeof(rt_mem_exclusive_region_t));
rt_exit_critical();
return RT_EOK;
}
}
rt_exit_critical();
LOG_E("Insufficient regions");
return RT_ERROR;
}
/**
* @brief The function will delete a memory region that is only accessible by the calling thread.
* The deleted region will be accessible by other threads.
*
* @param start is the start address of the memory region.
*
* @param size is the size of the memory region.
*
* @return Return the operation status. When the return value is RT_EOK, the operation is successful.
* If the return value is any other values, it represents the operation failed.
*/
rt_err_t rt_mprotect_delete_exclusive_region(void *start, rt_size_t size)
{
rt_uint8_t i;
rt_enter_critical();
for (i = 0; i < NUM_EXCLUSIVE_REGIONS; i++)
{
if (exclusive_regions[i].owner == rt_thread_self() && exclusive_regions[i].region.start == start && exclusive_regions[i].region.size == size)
{
exclusive_regions[i].owner = RT_NULL;
rt_exit_critical();
return RT_EOK;
}
}
rt_exit_critical();
LOG_E("Region not found");
return RT_ERROR;
}
INIT_BOARD_EXPORT(rt_mprotect_init);
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