53 lines
2 KiB
C
53 lines
2 KiB
C
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// Copyright 2015-2019 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <strings.h>
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#include "esp_efuse.h"
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#include "esp_efuse_table.h"
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#include "esp_flash_encrypt.h"
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void esp_flash_write_protect_crypt_cnt()
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{
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uint8_t flash_crypt_cnt_wr_dis = 0;
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esp_efuse_read_field_blob(ESP_EFUSE_WR_DIS_FLASH_CRYPT_CNT, &flash_crypt_cnt_wr_dis, 1);
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if (!flash_crypt_cnt_wr_dis) {
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esp_efuse_write_field_cnt(ESP_EFUSE_WR_DIS_FLASH_CRYPT_CNT, 1);
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}
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}
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esp_flash_enc_mode_t esp_get_flash_encryption_mode()
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{
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uint8_t efuse_flash_crypt_cnt_wr_protected = 0;
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uint8_t dis_dl_enc = 0, dis_dl_dec = 0, dis_dl_cache = 0;
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esp_flash_enc_mode_t mode = ESP_FLASH_ENC_MODE_DEVELOPMENT;
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if (esp_flash_encryption_enabled()) {
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/* Check if FLASH CRYPT CNT is write protected */
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esp_efuse_read_field_blob(ESP_EFUSE_WR_DIS_FLASH_CRYPT_CNT, &efuse_flash_crypt_cnt_wr_protected, 1);
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if (efuse_flash_crypt_cnt_wr_protected) {
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esp_efuse_read_field_blob(ESP_EFUSE_DISABLE_DL_CACHE, &dis_dl_cache, 1);
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esp_efuse_read_field_blob(ESP_EFUSE_DISABLE_DL_ENCRYPT, &dis_dl_enc, 1);
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esp_efuse_read_field_blob(ESP_EFUSE_DISABLE_DL_DECRYPT, &dis_dl_dec, 1);
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/* Check if DISABLE_DL_DECRYPT, DISABLE_DL_ENCRYPT & DISABLE_DL_CACHE are set */
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if ( dis_dl_cache && dis_dl_enc && dis_dl_dec ) {
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mode = ESP_FLASH_ENC_MODE_RELEASE;
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}
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}
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} else {
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mode = ESP_FLASH_ENC_MODE_DISABLED;
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}
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return mode;
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}
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