89 lines
2.7 KiB
C
89 lines
2.7 KiB
C
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/*
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* Copyright (c) 2006-2023, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2023-09-25 tangzz98 the first version
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*/
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#include <rtthread.h>
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#include <mprotect.h>
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#define THREAD_PRIORITY 25
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#define THREAD_STACK_SIZE 512
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#define THREAD_TIMESLICE 5
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rt_align(MPU_MIN_REGION_SIZE) rt_uint8_t ro_data[MPU_MIN_REGION_SIZE];
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static void thread1_entry(void *parameter)
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{
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(void)parameter;
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rt_kprintf("ro_data address: %p - %p\n", &ro_data[0], &ro_data[MPU_MIN_REGION_SIZE]);
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/* Thread 1 can write ro_data before configuring memory protection. */
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rt_kprintf("Thread 1 writes to ro_data before configuring memory protection\n");
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for (int i = 0; i < MPU_MIN_REGION_SIZE; i++)
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{
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ro_data[i] = i;
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rt_kprintf("ro_data[%d] = %d\n", i, ro_data[i]);
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}
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rt_mem_region_t ro_region =
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{
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.start = (void *)ro_data,
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.size = MPU_MIN_REGION_SIZE,
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.attr = RT_MEM_REGION_P_RO_U_RO,
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};
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/* Thread 1 configures ro_data as read only. */
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rt_kprintf("Thread 1 configures ro_data for read-only access for thread 1\n");
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rt_mprotect_add_region(RT_NULL, &ro_region);
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rt_kprintf("Thread 1 reads ro_data\n");
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for (int i = 0; i < MPU_MIN_REGION_SIZE; i++)
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{
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rt_kprintf("ro_data[%d] = %d\n", i, ro_data[i]);
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}
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rt_thread_delay(RT_TICK_PER_SECOND * 1);
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/* Thread 1 cannot write ro_data. */
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rt_kprintf("Thread 1 writes to ro_data\n");
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for (int i = 0; i < MPU_MIN_REGION_SIZE; i++)
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{
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ro_data[i] = i;
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}
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}
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static void thread2_entry(void *parameter)
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{
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(void)parameter;
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rt_kprintf("Thread 2 writes to ro_data\n");
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for (int i = 0; i < MPU_MIN_REGION_SIZE; i++)
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{
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/* Thread 2 can write ro_data. */
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ro_data[i] = i;
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rt_kprintf("ro_data[%d] = %d\n", i, ro_data[i]);
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}
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}
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int mprotect_example_ro_data()
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{
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extern void mprotect_example_exception_hook(rt_mem_exception_info_t *info);
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rt_hw_mpu_exception_set_hook(mprotect_example_exception_hook);
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rt_thread_t tid1 = RT_NULL;
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tid1 = rt_thread_create("thread1",
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thread1_entry, RT_NULL,
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THREAD_STACK_SIZE,
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THREAD_PRIORITY - 1,
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THREAD_TIMESLICE);
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rt_thread_startup(tid1);
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rt_thread_t tid2 = RT_NULL;
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tid2 = rt_thread_create("thread2",
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thread2_entry, RT_NULL,
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THREAD_STACK_SIZE,
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THREAD_PRIORITY,
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THREAD_TIMESLICE);
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rt_thread_startup(tid2);
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return 0;
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}
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MSH_CMD_EXPORT(mprotect_example_ro_data, Memory protection example (read-only data));
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