components/esp_hw_support/port/esp32/cpu_region_protect.c (ESP-IDF)

/* * SPDX-FileCopyrightText: 2023 Espressif Systems (Shanghai) CO LTD * * SPDX-License-Identifier: Apache-2.0 */ #include <stdint.h> #include "hal/mpu_hal.h" void esp_cpu_configure_region_protection(void) { /* Note: currently this is configured the same on all Xtensa targets * * 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 (size_t 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 }