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rt-thread/libcpu/arm/cortex-m33/mpu.c

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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 <rtdef.h>
#include <mprotect.h>
#define DBG_ENABLE
#define DBG_SECTION_NAME "MEMORY PROTECTION"
#define DBG_LEVEL DBG_ERROR
#include <rtdbg.h>
#define MEM_REGION_TO_MPU_INDEX(thread, region) ((((rt_size_t)region - (rt_size_t)(thread->mem_regions)) / sizeof(rt_mem_region_t)) + NUM_STATIC_REGIONS)
extern rt_mem_region_t *rt_mprotect_find_free_region(rt_thread_t thread);
extern rt_mem_region_t *rt_mprotect_find_region(rt_thread_t thread, rt_mem_region_t *region);
static rt_hw_mpu_exception_hook_t mem_manage_hook = RT_NULL;
static rt_uint8_t mpu_mair[8U];
rt_weak rt_uint8_t rt_hw_mpu_region_default_attr(rt_mem_region_t *region)
{
static rt_uint8_t default_mem_attr[] =
{
ARM_MPU_ATTR(ARM_MPU_ATTR_MEMORY_(1U, 0U, 1U, 0U), ARM_MPU_ATTR_MEMORY_(1U, 0U, 1U, 0U)),
ARM_MPU_ATTR(ARM_MPU_ATTR_MEMORY_(1U, 1U, 1U, 1U), ARM_MPU_ATTR_MEMORY_(1U, 1U, 1U, 1U)),
ARM_MPU_ATTR_DEVICE_nGnRE,
ARM_MPU_ATTR(ARM_MPU_ATTR_MEMORY_(1U, 1U, 1U, 1U), ARM_MPU_ATTR_MEMORY_(1U, 1U, 1U, 1U)),
ARM_MPU_ATTR(ARM_MPU_ATTR_MEMORY_(1U, 0U, 1U, 0U), ARM_MPU_ATTR_MEMORY_(1U, 0U, 1U, 0U)),
ARM_MPU_ATTR_DEVICE_nGnRE,
ARM_MPU_ATTR_DEVICE_nGnRE
};
rt_uint8_t attr = 0U;
if ((rt_uint32_t)region->start >= 0xE0000000U)
{
attr = ((rt_uint32_t)region->start >= 0xE0100000U) ? ARM_MPU_ATTR_DEVICE_nGnRE : ARM_MPU_ATTR_DEVICE_nGnRnE;
}
else
{
attr = default_mem_attr[((rt_uint32_t)region->start & ~0xFFFFFFFU) >> 29U];
}
return attr;
}
static rt_err_t _mpu_rbar_rlar(rt_mem_region_t *region)
{
rt_uint32_t rlar = 0U;
rt_uint8_t mair_attr;
rt_uint8_t index;
rt_uint8_t attr_indx = 0xFFU;
region->attr.rbar = (rt_uint32_t)region->start | (region->attr.rbar & (~MPU_RBAR_BASE_Msk));
rlar |= ((rt_uint32_t)region->start + region->size - 1U) & MPU_RLAR_LIMIT_Msk;
if (region->attr.mair_attr == RT_ARM_DEFAULT_MAIR_ATTR)
{
mair_attr = rt_hw_mpu_region_default_attr(region);
}
else
{
mair_attr = (rt_uint8_t)region->attr.mair_attr;
}
for (index = 0U; index < 8U; index++)
{
if (mpu_mair[index] == RT_ARM_DEFAULT_MAIR_ATTR)
{
break;
}
else if (mpu_mair[index] == mair_attr)
{
attr_indx = index;
break;
}
}
/*
* Current region's mair_attr does not match any existing region.
* All entries in MPU_MAIR are configured.
*/
if (index == 8U)
{
return RT_ERROR;
}
/* An existing region has the same mair_attr. */
if (attr_indx != 0xFFU)
{
rlar |= attr_indx & MPU_RLAR_AttrIndx_Msk;
}
/* Current region's mair_attr does not match any existing region. */
else
{
ARM_MPU_SetMemAttr(index, mair_attr);
rlar |= index & MPU_RLAR_AttrIndx_Msk;
}
rlar |= MPU_RLAR_EN_Msk;
region->attr.rlar = rlar;
return RT_EOK;
}
rt_bool_t rt_hw_mpu_region_valid(rt_mem_region_t *region)
{
if (region->size < MPU_MIN_REGION_SIZE)
{
LOG_E("Region size is too small");
return RT_FALSE;
}
if (region->size & (~(MPU_MIN_REGION_SIZE - 1U)) != region->size)
{
LOG_E("Region size is not a multiple of 32 bytes");
return RT_FALSE;
}
if ((rt_uint32_t)region->start & (MPU_MIN_REGION_SIZE - 1U) != 0U)
{
LOG_E("Region is not aligned by 32 bytes");
return RT_FALSE;
}
return RT_TRUE;
}
rt_err_t rt_hw_mpu_init(void)
{
extern rt_mem_region_t static_regions[NUM_STATIC_REGIONS];
rt_uint8_t num_mpu_regions;
rt_uint8_t num_dynamic_regions;
rt_uint8_t index;
num_mpu_regions = (rt_uint8_t)((MPU->TYPE & MPU_TYPE_DREGION_Msk) >> MPU_TYPE_DREGION_Pos);
if (num_mpu_regions == 0U)
{
LOG_E("Hardware does not support MPU");
return RT_ERROR;
}
if (num_mpu_regions != NUM_MEM_REGIONS)
{
LOG_E("Incorrect setting of NUM_MEM_REGIONS");
LOG_E("NUM_MEM_REGIONS = %d, hardware support %d MPU regions", NUM_MEM_REGIONS, num_mpu_regions);
return RT_ERROR;
}
num_dynamic_regions = NUM_DYNAMIC_REGIONS + NUM_EXCLUSIVE_REGIONS;
if (num_dynamic_regions + NUM_STATIC_REGIONS > num_mpu_regions)
{
LOG_E("Insufficient MPU regions: %d hardware MPU regions", num_mpu_regions);
#ifdef RT_USING_HW_STACK_GUARD
LOG_E("Current configuration requires %d static regions + %d configurable regions + %d exclusive regions + %d stack guard regions", NUM_STATIC_REGIONS, NUM_CONFIGURABLE_REGIONS, NUM_EXCLUSIVE_REGIONS, 1);
#else
LOG_E("Current configuration requires %d static regions + %d configurable regions + %d exclusive regions", NUM_STATIC_REGIONS, NUM_CONFIGURABLE_REGIONS, NUM_EXCLUSIVE_REGIONS);
#endif
return RT_ERROR;
}
for (index = 0U; index < 8U; index++)
{
mpu_mair[index] = RT_ARM_DEFAULT_MAIR_ATTR;
}
ARM_MPU_Disable();
for (index = 0U; index < NUM_STATIC_REGIONS; index++)
{
if (rt_hw_mpu_region_valid(&(static_regions[index])) == RT_FALSE)
{
return RT_ERROR;
}
if (_mpu_rbar_rlar(&(static_regions[index])) == RT_ERROR)
{
LOG_E("Number of different mair_attr configurations exceeds 8");
return RT_ERROR;
}
ARM_MPU_SetRegion(index, static_regions[index].attr.rbar, static_regions[index].attr.rlar);
}
/* Enable background region. */
ARM_MPU_Enable(MPU_CTRL_PRIVDEFENA_Msk);
return RT_EOK;
}
rt_err_t rt_hw_mpu_add_region(rt_thread_t thread, rt_mem_region_t *region)
{
rt_uint8_t index;
rt_mem_region_t *free_region;
if (rt_hw_mpu_region_valid(region) == RT_FALSE)
{
return RT_ERROR;
}
rt_enter_critical();
if (_mpu_rbar_rlar(region) == RT_ERROR)
{
rt_exit_critical();
LOG_E("Number of different mair_attr configurations exceeds 8");
return RT_ERROR;
}
if (thread == RT_NULL)
{
rt_exit_critical();
return RT_EOK;
}
free_region = rt_mprotect_find_free_region(thread);
if (free_region == RT_NULL)
{
rt_exit_critical();
LOG_E("Insufficient regions");
return RT_ERROR;
}
rt_memcpy(free_region, region, sizeof(rt_mem_region_t));
if (thread == rt_thread_self())
{
index = MEM_REGION_TO_MPU_INDEX(thread, free_region);
ARM_MPU_SetRegion(index, region->attr.rbar, region->attr.rlar);
}
rt_exit_critical();
return RT_EOK;
}
rt_err_t rt_hw_mpu_delete_region(rt_thread_t thread, rt_mem_region_t *region)
{
rt_uint8_t index;
rt_enter_critical();
rt_mem_region_t *found_region = rt_mprotect_find_region(thread, region);
if (found_region == RT_NULL)
{
rt_exit_critical();
LOG_E("Region not found");
return RT_ERROR;
}
rt_memset(found_region, 0, sizeof(rt_mem_region_t));
if (thread == rt_thread_self())
{
index = MEM_REGION_TO_MPU_INDEX(thread, found_region);
ARM_MPU_ClrRegion(index);
}
rt_exit_critical();
return RT_EOK;
}
rt_err_t rt_hw_mpu_update_region(rt_thread_t thread, rt_mem_region_t *region)
{
rt_uint8_t index;
if (rt_hw_mpu_region_valid(region) == RT_FALSE)
{
return RT_ERROR;
}
rt_enter_critical();
if (_mpu_rbar_rlar(region) == RT_ERROR)
{
rt_exit_critical();
LOG_E("Number of different mair_attr configurations exceeds 8");
return RT_ERROR;
}
rt_mem_region_t *old_region = rt_mprotect_find_region(thread, region);
if (old_region == RT_NULL)
{
rt_exit_critical();
LOG_E("Region not found");
return RT_ERROR;
}
rt_memcpy(old_region, region, sizeof(rt_mem_region_t));
if (thread == rt_thread_self())
{
index = MEM_REGION_TO_MPU_INDEX(thread, old_region);
ARM_MPU_SetRegion(index, region->attr.rbar, region->attr.rlar);
}
rt_exit_critical();
return RT_EOK;
}
rt_err_t rt_hw_mpu_exception_set_hook(rt_hw_mpu_exception_hook_t hook)
{
mem_manage_hook = hook;
return RT_EOK;
}
void rt_hw_mpu_table_switch(rt_thread_t thread)
{
extern rt_mem_exclusive_region_t exclusive_regions[NUM_EXCLUSIVE_REGIONS];
rt_uint8_t i;
rt_uint8_t index = NUM_STATIC_REGIONS;
if (thread->mem_regions != RT_NULL)
{
for (i = 0U; i < NUM_DYNAMIC_REGIONS; i++)
{
if (((rt_mem_region_t *)thread->mem_regions)[i].size != 0U)
{
ARM_MPU_SetRegion(index, ((rt_mem_region_t *)thread->mem_regions)[i].attr.rbar, ((rt_mem_region_t *)thread->mem_regions)[i].attr.rlar);
index += 1U;
}
}
}
for (i = 0U; i < NUM_EXCLUSIVE_REGIONS; i++)
{
if ((exclusive_regions[i].owner != RT_NULL) && (exclusive_regions[i].owner != thread))
{
ARM_MPU_SetRegion(index, exclusive_regions[i].region.attr.rbar, exclusive_regions[i].region.attr.rlar);
index += 1U;
}
}
for ( ; index < NUM_MEM_REGIONS; index++)
{
ARM_MPU_ClrRegion(index);
}
}
void MemManage_Handler(void)
{
extern rt_mem_region_t static_regions[NUM_STATIC_REGIONS];
extern rt_mem_exclusive_region_t exclusive_regions[NUM_EXCLUSIVE_REGIONS];
rt_mem_exception_info_t info;
rt_int8_t i;
rt_memset(&info, 0, sizeof(rt_mem_exception_info_t));
info.thread = rt_thread_self();
if (SCB->CFSR & SCB_CFSR_MMARVALID_Msk)
{
info.addr = (void *)(SCB->MMFAR);
for (i = NUM_EXCLUSIVE_REGIONS - 1; i >= 0; i--)
{
if ((exclusive_regions[i].owner != RT_NULL) && ((exclusive_regions[i].owner != rt_thread_self())) && ADDR_IN_REGION(info.addr, (rt_mem_region_t *)&(exclusive_regions[i])))
{
rt_memcpy(&(info.region), &(exclusive_regions[i]), sizeof(rt_mem_region_t));
break;
}
}
if (info.region.size == 0U)
{
if (info.thread->mem_regions != RT_NULL)
{
for (i = NUM_DYNAMIC_REGIONS - 1; i >= 0; i--)
{
if ((((rt_mem_region_t *)info.thread->mem_regions)[i].size != 0U) && ADDR_IN_REGION(info.addr, &(((rt_mem_region_t *)info.thread->mem_regions)[i])))
{
rt_memcpy(&(info.region), &(((rt_mem_region_t *)info.thread->mem_regions)[i]), sizeof(rt_mem_region_t));
break;
}
}
}
if (info.region.size == 0U)
{
for (i = NUM_STATIC_REGIONS - 1; i >= 0; i--)
{
if (ADDR_IN_REGION(info.addr, &(static_regions[i])))
{
rt_memcpy(&(info.region), &(static_regions[i]), sizeof(rt_mem_region_t));
break;
}
}
}
}
}
info.mmfsr = (SCB->CFSR & SCB_CFSR_MEMFAULTSR_Msk) >> SCB_CFSR_MEMFAULTSR_Pos;
if (mem_manage_hook != RT_NULL)
{
mem_manage_hook(&info);
}
while (1);
}
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