/* mbed Microcontroller Library * Copyright (c) 2017-2020 ARM Limited * 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. */ #ifndef MBED_MBR_BLOCK_DEVICE_H #define MBED_MBR_BLOCK_DEVICE_H #include "BlockDevice.h" namespace mbed { /** \addtogroup storage-blockdevice */ /** @{*/ /** Additional error codes used for MBR records */ enum { BD_ERROR_INVALID_MBR = -3101, BD_ERROR_INVALID_PARTITION = -3102, }; /** Block device for managing a Master Boot Record * https://en.wikipedia.org/wiki/Master_boot_record * * @note * The MBR partition table is relatively limited: * - At most 4 partitions are supported * - Extended partitions are currently not supported and will error during init */ class MBRBlockDevice : public BlockDevice { public: /** Format the MBR to contain the following partition * * @param bd Block device to partition * @param part Partition to use, 1-4 * @param type 8-bit partition type to specify the filesystem to use in this partition. * It can be found in the filesystem documentation or refer to * https://en.wikipedia.org/wiki/Partition_type#List_of_partition_IDs * @param start Start block address to map to block 0 of partition. * Negative addresses are calculated from the end of the * underlying block devices. Block 0 is implicitly ignored * from the range to store the MBR. * @return 0 on success or a negative error code on failure. * @note This is the same as partition(bd, part, type, start, bd->size()) */ static int partition(BlockDevice *bd, int part, uint8_t type, bd_addr_t start); /** Format the MBR to contain the following partition * * @param bd Block device to partition * @param part Partition to use, 1-4 * @param type 8-bit partition type to specify the filesystem to use in this partition. * It can be found in the filesystem documentation or refer to * https://en.wikipedia.org/wiki/Partition_type#List_of_partition_IDs * @param start Start block address to map to block 0 of partition, * negative addresses are calculated from the end of the * underlying block devices. Block 0 is implicitly ignored * from the range to store the MBR. * @param stop End block address to mark the end of the partition. * This block is not mapped: negative addresses are calculated * from the end of the underlying block device. * @return 0 on success or a negative error code on failure. */ static int partition(BlockDevice *bd, int part, uint8_t type, bd_addr_t start, bd_addr_t stop); /** Lifetime of the block device * * @param bd Block device to back the MBRBlockDevice * @param part Partition to use, 1-4 */ MBRBlockDevice(BlockDevice *bd, int part); /** Lifetime of the block device */ virtual ~MBRBlockDevice() {}; /** Initialize a block device * * @return 0 on success or a negative error code on failure */ virtual int init(); /** Deinitialize a block device * * @return 0 on success or a negative error code on failure */ virtual int deinit(); /** Ensure data on storage is in sync with the driver * * @return 0 on success or a negative error code on failure */ virtual int sync(); /** Read blocks from a block device * * @param buffer Buffer to read blocks into * @param addr Address of block to begin reading from * @param size Size to read in bytes, must be a multiple of read block size * @return 0 on success or a negative error code on failure */ virtual int read(void *buffer, bd_addr_t addr, bd_size_t size); /** Program blocks to a block device * * The blocks must have been erased prior to being programmed * * @param buffer Buffer of data to write to blocks * @param addr Address of block to begin writing to * @param size Size to write in bytes, must be a multiple of program block size * @return 0 on success or a negative error code on failure */ virtual int program(const void *buffer, bd_addr_t addr, bd_size_t size); /** Erase blocks on a block device * * The state of an erased block is undefined until it has been programmed, * unless get_erase_value returns a non-negative byte value * * @param addr Address of block to begin erasing * @param size Size to erase in bytes, must be a multiple of erase block size * @return 0 on success or a negative error code on failure */ virtual int erase(bd_addr_t addr, bd_size_t size); /** Get the size of a readable block * * @return Size of a readable block in bytes */ virtual bd_size_t get_read_size() const; /** Get the size of a programmable block * * @return Size of a programmable block in bytes * @note Must be a multiple of the read size */ virtual bd_size_t get_program_size() const; /** Get the size of an erasable block * * @return Size of an erasable block in bytes * @note Must be a multiple of the program size */ virtual bd_size_t get_erase_size() const; /** Get the size of an erasable block given address * * @param addr Address within the erasable block * @return Size of an erasable block in bytes * @note Must be a multiple of the program size */ virtual bd_size_t get_erase_size(bd_addr_t addr) const; /** Get the value of storage when erased * * If get_erase_value returns a non-negative byte value, the underlying * storage is set to that value when erased, and storage containing * that value can be programmed without another erase. * * @return The value of storage when erased, or -1 if you can't * rely on the value of erased storage */ virtual int get_erase_value() const; /** Get the total size of the underlying device * * @return Size of the underlying device in bytes */ virtual bd_size_t size() const; /** Get the offset of the partition on the underlying block device * @return Offset of the partition on the underlying device */ virtual bd_addr_t get_partition_start() const; /** Get size of partition on underlying block device * @return Size of the partition on the underlying device */ virtual bd_addr_t get_partition_stop() const; /** Get 8-bit type of the partition * @return 8-bit type of partition assigned during format */ virtual uint8_t get_partition_type() const; /** Get the partition number * @return The partition number, 1-4 */ virtual int get_partition_number() const; /** Get the BlockDevice class type. * * @return A string represent the BlockDevice class type. */ virtual const char *get_type() const; protected: BlockDevice *_bd; bd_size_t _offset; bd_size_t _size; uint8_t _type; uint8_t _part; uint32_t _init_ref_count; bool _is_initialized; }; /** @}*/ } // namespace mbed // Added "using" for backwards compatibility #ifndef MBED_NO_GLOBAL_USING_DIRECTIVE using mbed::MBRBlockDevice; #endif #endif