bootloader_support: move anti rollback API to common loader section

API `bootloader_common_get_partition_description` is required for
anti-rollback feature and should be part of common loader code.

components/bootloader_support/src/bootloader_common.c

@@ -177,30 +177,6 @@ esp_err_t bootloader_common_get_sha256_of_partition (uint32_t address, uint32_t
     return bootloader_sha256_flash_contents(address, size, out_sha_256);
 }
 
-esp_err_t bootloader_common_get_partition_description(const esp_partition_pos_t *partition, esp_app_desc_t *app_desc)
-{
-    if (partition == NULL || app_desc == NULL || partition->offset == 0) {
-        return ESP_ERR_INVALID_ARG;
-    }
-
-    const uint32_t app_desc_offset = sizeof(esp_image_header_t) + sizeof(esp_image_segment_header_t);
-    const uint32_t mmap_size = app_desc_offset + sizeof(esp_app_desc_t);
-    const uint8_t *image = bootloader_mmap(partition->offset, mmap_size);
-    if (image == NULL) {
-        ESP_LOGE(TAG, "bootloader_mmap(0x%x, 0x%x) failed", partition->offset, mmap_size);
-        return ESP_FAIL;
-    }
-
-    memcpy(app_desc, image + app_desc_offset, sizeof(esp_app_desc_t));
-    bootloader_munmap(image);
-
-    if (app_desc->magic_word != ESP_APP_DESC_MAGIC_WORD) {
-        return ESP_ERR_NOT_FOUND;
-    }
-
-    return ESP_OK;
-}
-
 void bootloader_common_vddsdio_configure(void)
 {
 #if CONFIG_BOOTLOADER_VDDSDIO_BOOST_1_9V

components/bootloader_support/src/bootloader_common_loader.c

@@ -1,3 +1,17 @@
+// Copyright 2020 Espressif Systems (Shanghai) Co., 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 "string.h"
 #include "sdkconfig.h"
 #include "esp_err.h"
@@ -20,6 +34,7 @@
 #include "esp_image_format.h"
 #include "bootloader_sha.h"
 #include "sys/param.h"
+#include "bootloader_flash_priv.h"
 
 #define ESP_PARTITION_HASH_LEN 32 /* SHA-256 digest length */
 
@@ -97,6 +112,29 @@ int bootloader_common_select_otadata(const esp_ota_select_entry_t *two_otadata,
     return active_otadata;
 }
 
+esp_err_t bootloader_common_get_partition_description(const esp_partition_pos_t *partition, esp_app_desc_t *app_desc)
+{
+    if (partition == NULL || app_desc == NULL || partition->offset == 0) {
+        return ESP_ERR_INVALID_ARG;
+    }
+
+    const uint32_t app_desc_offset = sizeof(esp_image_header_t) + sizeof(esp_image_segment_header_t);
+    const uint32_t mmap_size = app_desc_offset + sizeof(esp_app_desc_t);
+    const uint8_t *image = bootloader_mmap(partition->offset, mmap_size);
+    if (image == NULL) {
+        ESP_LOGE(TAG, "bootloader_mmap(0x%x, 0x%x) failed", partition->offset, mmap_size);
+        return ESP_FAIL;
+    }
+
+    memcpy(app_desc, image + app_desc_offset, sizeof(esp_app_desc_t));
+    bootloader_munmap(image);
+
+    if (app_desc->magic_word != ESP_APP_DESC_MAGIC_WORD) {
+        return ESP_ERR_NOT_FOUND;
+    }
+
+    return ESP_OK;
+}
 
 #if defined( CONFIG_BOOTLOADER_SKIP_VALIDATE_IN_DEEP_SLEEP ) || defined( CONFIG_BOOTLOADER_CUSTOM_RESERVE_RTC )