esp-idf/components/bootloader_support/src/bootloader_mem.c

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// Copyright 2020 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <stdbool.h>
#include "xtensa/config/core.h"
#include "hal/cpu_hal.h"
#include "hal/mpu_hal.h"
#include "hal/mpu_types.h"
#include "soc/mpu_caps.h"
#include "bootloader_mem.h"
#include "xt_instr_macros.h"
#include "xtensa/config/specreg.h"
static inline void cpu_configure_region_protection(void)
{
/* Currently, the only supported chips esp32 and esp32s2
* have the same configuration. Move this to the port layer once
* more chips with different configurations are supported.
*
* Both chips have the address space divided into 8 regions, 512MB each.
*/
const int illegal_regions[] = {0, 4, 5, 6, 7}; // 0x00000000, 0x80000000, 0xa0000000, 0xc0000000, 0xe0000000
for (int i = 0; i < sizeof(illegal_regions) / sizeof(illegal_regions[0]); ++i) {
mpu_hal_set_region_access(illegal_regions[i], MPU_REGION_ILLEGAL);
}
mpu_hal_set_region_access(1, MPU_REGION_RW); // 0x20000000
}
void bootloader_init_mem(void)
{
cpu_hal_init_hwloop();
// protect memory region
cpu_configure_region_protection();
}