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80 lines
2.6 KiB
C
80 lines
2.6 KiB
C
/*
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* Copyright 2024 Google LLC
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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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*
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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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*/
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#include "drivers/flash.h"
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#include "flash_region/flash_region.h"
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#include "system/bootbits.h"
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#include "system/firmware_storage.h"
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#include "system/logging.h"
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#include "util/math.h"
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// Don't allow PRF updating when we're in PRF
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#ifndef RECOVERY_FW
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static void prv_do_update(void) {
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PBL_LOG(LOG_LEVEL_INFO, "Updating PRF!");
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flash_prf_set_protection(false);
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bool saved_sleep_when_idle = flash_get_sleep_when_idle();
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flash_sleep_when_idle(false);
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FirmwareDescription description =
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firmware_storage_read_firmware_description(FLASH_REGION_FIRMWARE_SCRATCH_BEGIN);
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if (!firmware_storage_check_valid_firmware_description(FLASH_REGION_FIRMWARE_SCRATCH_BEGIN,
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&description)) {
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PBL_LOG(LOG_LEVEL_WARNING, "Invalid recovery firmware CRC in SPI flash!");
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goto done;
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}
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const uint32_t total_length = description.description_length + description.firmware_length;
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PBL_LOG(LOG_LEVEL_DEBUG, "Erasing previous PRF...");
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flash_region_erase_optimal_range(FLASH_REGION_SAFE_FIRMWARE_BEGIN,
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FLASH_REGION_SAFE_FIRMWARE_BEGIN,
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FLASH_REGION_SAFE_FIRMWARE_BEGIN + total_length,
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FLASH_REGION_SAFE_FIRMWARE_END);
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PBL_LOG(LOG_LEVEL_DEBUG, "Copying PRF from scratch to the PRF slot");
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uint8_t buffer[512];
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uint32_t offset = 0;
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while (offset < total_length) {
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const uint32_t chunk_size = MIN(sizeof(buffer), (total_length - offset));
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flash_read_bytes(buffer, FLASH_REGION_FIRMWARE_SCRATCH_BEGIN + offset, chunk_size);
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flash_write_bytes(buffer, FLASH_REGION_SAFE_FIRMWARE_BEGIN + offset, chunk_size);
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offset += chunk_size;
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}
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done:
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flash_prf_set_protection(true);
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flash_sleep_when_idle(saved_sleep_when_idle);
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PBL_LOG(LOG_LEVEL_DEBUG, "Done!");
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}
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#endif
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void check_prf_update(void) {
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if (!boot_bit_test(BOOT_BIT_NEW_PRF_AVAILABLE)) {
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return;
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}
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boot_bit_clear(BOOT_BIT_NEW_PRF_AVAILABLE);
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#ifndef RECOVERY_FW
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prv_do_update();
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#endif
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}
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