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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 <rtthread.h>
#include <mprotect.h>
#define THREAD_PRIORITY 25
#define THREAD_STACK_SIZE 512
#define THREAD_TIMESLICE 5
rt_align(MPU_MIN_REGION_SIZE) rt_uint8_t thread1_private_data[MPU_MIN_REGION_SIZE];
static void thread1_entry(void *parameter)
{
(void)parameter;
/* Thread 1 configures thread1_private_data for exclusive access */
rt_kprintf("Thread 1 configures private data\n");
rt_mprotect_add_exclusive_region((void *)thread1_private_data, MPU_MIN_REGION_SIZE);
rt_kprintf("Thread 1 private data address: %p - %p\n", &thread1_private_data[0], &thread1_private_data[MPU_MIN_REGION_SIZE]);
rt_kprintf("Thread 1 reads and writes to its private data\n");
for (int i = 0; i < MPU_MIN_REGION_SIZE; i++)
{
/* Thread 1 has access to its private data */
thread1_private_data[i] = i;
rt_kprintf("thread1_private_data[%d] = %d\n", i, thread1_private_data[i]);
}
}
static void thread2_entry(void *parameter)
{
(void)parameter;
rt_kprintf("Thread 2 writes to thread 1's private data\n");
for (int i = 0; i < MPU_MIN_REGION_SIZE; i++)
{
/*
* Thread 2 does not have access to thread 1's private data.
* Access generates an exception.
*/
thread1_private_data[i] = i;
}
}
int mprotect_example_exclusive_region()
{
extern void mprotect_example_exception_hook(rt_mem_exception_info_t *info);
rt_hw_mpu_exception_set_hook(mprotect_example_exception_hook);
rt_thread_t tid1 = RT_NULL;
tid1 = rt_thread_create("thread1",
thread1_entry, RT_NULL,
THREAD_STACK_SIZE,
THREAD_PRIORITY - 1,
THREAD_TIMESLICE);
if (tid1 != RT_NULL)
rt_thread_startup(tid1);
rt_thread_t tid2 = RT_NULL;
tid2 = rt_thread_create("thread2",
thread2_entry, RT_NULL,
THREAD_STACK_SIZE,
THREAD_PRIORITY,
THREAD_TIMESLICE);
if (tid2 != RT_NULL)
rt_thread_startup(tid2);
return 0;
}
MSH_CMD_EXPORT(mprotect_example_exclusive_region, Memory protection example (exclusive_region));
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