blob: a7d012baa1ea2fd71da62bb643a24d297148d797 [file] [log] [blame]
/**
*
* Built with ARM Mbed-OS
*
* Copyright (c) 2019-2021 Embedded Planet, Inc.
* SPDX-License-Identifier: Apache-2.0
*
* 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.
*/
#if MCUBOOT_DATA_SHARING && !MCUBOOT_BOOTLOADER_BUILD
#include "DataShare.h"
#include "boot_status.h"
#include <cstring>
#define PTR_TO_UINT8(x) ((volatile uint8_t *) x)
#define PTR_TO_UINT16(x) ((volatile uint16_t *) x)
#define PTR_TO_UINT32(x) ((volatile uint32_t *) x)
#define SHARED_DATA_ENTRY_BASE MCUBOOT_SHARED_DATA_BASE+SHARED_DATA_HEADER_SIZE
DataShare::DataShare(uint8_t *shared_base) : _shared_base(shared_base) {
volatile uint16_t *ptr = PTR_TO_UINT16(MCUBOOT_SHARED_DATA_BASE);
/* Validate magic word */
if(*ptr++ == SHARED_DATA_TLV_INFO_MAGIC) {
_is_valid = true;
}
_total_size = *ptr;
}
bool DataShare::is_valid() {
return _is_valid;
}
uint16_t DataShare::get_total_size() {
if(!is_valid()) {
return 0;
}
return _total_size;
}
int DataShare::get_next(uint16_t *type, mbed::Span<uint8_t> buf, uint16_t *actual_size) {
if(!is_valid()) {
return DATA_SHARE_ERROR_CORRUPT;
}
if(_current_offset >= (_total_size - SHARED_DATA_HEADER_SIZE)) {
return DATA_SHARE_ERROR_EOF;
}
uint16_t working_offset = _current_offset;
/* Get the type and the length */
*type = *PTR_TO_UINT16((SHARED_DATA_ENTRY_BASE + working_offset));
working_offset += sizeof(uint16_t);
*actual_size = *PTR_TO_UINT16((SHARED_DATA_ENTRY_BASE + working_offset));
working_offset += sizeof(uint16_t);
/* Check if the output buffer is large enough */
if((size_t)buf.size() < *actual_size) {
return DATA_SHARE_ERROR_OUT_OF_MEM;
}
/* Copy data of TLV entry */
memcpy(buf.data(), (const uint8_t*)PTR_TO_UINT8((SHARED_DATA_ENTRY_BASE + working_offset)), *actual_size);
working_offset += *actual_size;
/* Update state */
_current_offset = working_offset;
return DATA_SHARE_OK;
}
void DataShare::rewind() {
_current_offset = 0;
}
#endif /* MCUBOOT_DATA_SHARING && !MCUBOOT_BOOTLOADER_BUILD */