mirror of
https://github.com/trezor/trezor-firmware.git
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110 lines
4.5 KiB
C
110 lines
4.5 KiB
C
/*
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* This file is part of the Trezor project, https://trezor.io/
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*
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* Copyright (c) SatoshiLabs
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef FLASH_AREA_H
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#define FLASH_AREA_H
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#include <stdint.h>
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#include "secbool.h"
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#include "flash.h"
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/**
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* Flash driver interface is designed to abstract away differences between
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* various MCUs used in Trezor devices.
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*
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* Generally, flash memory is divided into sectors. On different MCUs, sectors
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* may have different sizes, and therefore, different number of sectors are used
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* for a given purpose. For example, on STM32F4, the sectors are relatively
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* large so we use single sector for Storage. On STM32U5, the sectors are
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* smaller, so we use multiple sectors for the Storage. Storage implementation
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* should not care about this, and should use flash_area_t interface to access
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* the flash memory.
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*
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* flash_area_t represents a location in flash memory. It may be contiguous, or
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* it may be composed of multiple non-contiguous subareas.
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*
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* flash_subarea_t represents a contiguous area in flash memory, specified by
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* first_sector and num_sectors.
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*/
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typedef struct {
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uint16_t first_sector;
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uint16_t num_sectors;
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} flash_subarea_t;
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typedef struct {
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flash_subarea_t subarea[4];
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uint8_t num_subareas;
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} flash_area_t;
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uint32_t flash_area_get_size(const flash_area_t *area);
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uint16_t flash_area_total_sectors(const flash_area_t *area);
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const void *flash_area_get_address(const flash_area_t *area, uint32_t offset,
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uint32_t size);
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#if defined FLASH_BIT_ACCESS
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secbool __wur flash_area_write_byte(const flash_area_t *area, uint32_t offset,
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uint8_t data);
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secbool __wur flash_area_write_word(const flash_area_t *area, uint32_t offset,
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uint32_t data);
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#endif
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secbool __wur flash_area_write_quadword(const flash_area_t *area,
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uint32_t offset, const uint32_t *data);
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secbool __wur flash_area_write_burst(const flash_area_t *area, uint32_t offset,
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const uint32_t *data);
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secbool __wur flash_area_write_block(const flash_area_t *area, uint32_t offset,
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const flash_block_t block);
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// Writes data to specified 'offset' inside a flash area
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// Data is written in efficient way, using the smallest possible number of
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// flash operations on the given architecture.
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// Data and its size must be aligned to size of one flash block
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secbool __wur flash_area_write_data(const flash_area_t *area, uint32_t offset,
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const void *data, uint32_t size);
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// Writes data to specified 'offset' inside a flash area
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// Data is written in efficient way, using the smallest possible number of
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// flash operations on the given architecture.
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// Data and total size must be aligned to size of one flash block
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// The difference between data_size and total_size is padded with 'padding'
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secbool __wur flash_area_write_data_padded(const flash_area_t *area,
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uint32_t offset, const void *data,
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uint32_t data_size, uint8_t padding,
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uint32_t total_size);
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secbool __wur flash_area_erase(const flash_area_t *area,
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void (*progress)(int pos, int len));
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secbool __wur flash_area_erase_bulk(const flash_area_t *area, int count,
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void (*progress)(int pos, int len));
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// Erases the single sector in the designated flash area
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// The 'offset' parameter must indicate the relative sector offset within the
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// flash area If 'offset' is outside the bounds of the flash area,
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// 'bytes_erased' is set to 0 otherwise, 'bytes_erased' is set to the size of
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// the erased sector
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secbool __wur flash_area_erase_partial(const flash_area_t *area,
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uint32_t offset, uint32_t *bytes_erased);
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#endif // FLASH_AREA_H
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