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310 lines
9.1 KiB
310 lines
9.1 KiB
/*
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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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#include "flash_area.h"
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#include <stdbool.h>
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#include <stddef.h>
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#include <string.h>
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uint32_t flash_area_get_size(const flash_area_t *area) {
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uint32_t size = 0;
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for (int i = 0; i < area->num_subareas; i++) {
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size += flash_sector_size(area->subarea[i].first_sector,
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area->subarea[i].num_sectors);
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}
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return size;
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}
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uint16_t flash_area_total_sectors(const flash_area_t *area) {
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uint16_t total = 0;
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for (int i = 0; i < area->num_subareas; i++) {
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total += area->subarea[i].num_sectors;
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}
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return total;
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}
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static secbool get_sector_and_offset(const flash_area_t *area, uint32_t offset,
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uint16_t *sector_out,
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uint32_t *offset_out) {
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for (int i = 0; i < area->num_subareas; i++) {
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// Get the sub-area parameters
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uint16_t first_sector = area->subarea[i].first_sector;
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uint16_t num_sectors = area->subarea[i].num_sectors;
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uint32_t subarea_size = flash_sector_size(first_sector, num_sectors);
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// Does the requested offset start in the sub-area?
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if (offset < subarea_size) {
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uint16_t found_sector = flash_sector_find(first_sector, offset);
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*sector_out = found_sector;
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*offset_out =
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offset - flash_sector_size(first_sector, found_sector - first_sector);
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return sectrue;
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}
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offset -= subarea_size;
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}
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return secfalse;
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}
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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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for (int i = 0; i < area->num_subareas; i++) {
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// Get sub-area parameters
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uint16_t first_sector = area->subarea[i].first_sector;
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uint16_t num_sectors = area->subarea[i].num_sectors;
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uint32_t subarea_size = flash_sector_size(first_sector, num_sectors);
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// Does the requested block start in the sub-area?
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if (offset < subarea_size) {
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// Does the requested block fit in the sub-area?
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if (offset + size <= subarea_size) {
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const uint8_t *ptr =
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(const uint8_t *)flash_get_address(first_sector, 0, 0);
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// We expect that all sectors/pages in the sub-area make
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// a continuous block of adresses with the same security atributes
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return ptr + offset;
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} else {
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return NULL;
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}
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}
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offset -= subarea_size;
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}
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return NULL;
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}
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#if defined FLASH_BIT_ACCESS
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secbool flash_area_write_byte(const flash_area_t *area, uint32_t offset,
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uint8_t data) {
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uint16_t sector;
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uint32_t sector_offset;
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if (get_sector_and_offset(area, offset, §or, §or_offset) != sectrue) {
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return secfalse;
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}
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return flash_write_byte(sector, sector_offset, data);
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}
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secbool flash_area_write_word(const flash_area_t *area, uint32_t offset,
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uint32_t data) {
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uint16_t sector;
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uint32_t sector_offset;
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if (get_sector_and_offset(area, offset, §or, §or_offset) != sectrue) {
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return secfalse;
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}
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return flash_write_word(sector, sector_offset, data);
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}
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#else // not defined FLASH_BIT_ACCESS
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secbool flash_area_write_quadword(const flash_area_t *area, uint32_t offset,
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const uint32_t *data) {
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uint16_t sector;
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uint32_t sector_offset;
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if (get_sector_and_offset(area, offset, §or, §or_offset) != sectrue) {
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return secfalse;
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}
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return flash_write_quadword(sector, sector_offset, data);
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}
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#endif // not defined FLASH_BIT_ACCESS
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#ifdef FLASH_BURST_SIZE
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secbool flash_area_write_burst(const flash_area_t *area, uint32_t offset,
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const uint32_t *data) {
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uint16_t sector;
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uint32_t sector_offset;
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if (get_sector_and_offset(area, offset, §or, §or_offset) != sectrue) {
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return secfalse;
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}
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return flash_write_burst(sector, sector_offset, data);
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}
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#endif
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secbool 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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if (!FLASH_IS_ALIGNED(offset)) {
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return secfalse;
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}
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uint16_t sector;
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uint32_t sector_offset;
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if (sectrue != get_sector_and_offset(area, offset, §or, §or_offset)) {
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return secfalse;
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}
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return flash_write_block(sector, sector_offset, block);
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}
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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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return flash_area_write_data_padded(area, offset, data, size, 0, size);
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}
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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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if (offset % FLASH_BLOCK_SIZE) {
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return secfalse;
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}
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if (total_size % FLASH_BLOCK_SIZE) {
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return secfalse;
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}
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if (data_size > total_size) {
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return secfalse;
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}
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if (offset + total_size > flash_area_get_size(area)) {
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return secfalse;
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}
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const uint32_t *data32 = (const uint32_t *)data;
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while (total_size > 0) {
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#ifdef FLASH_BURST_SIZE
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if ((offset % FLASH_BURST_SIZE) == 0 &&
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(offset + FLASH_BURST_SIZE) <= total_size) {
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if (data_size >= FLASH_BURST_SIZE) {
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if (flash_area_write_burst(area, offset, data32) != sectrue) {
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return secfalse;
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}
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data_size -= FLASH_BURST_SIZE;
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data32 += FLASH_BURST_WORDS;
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} else {
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uint32_t burst[FLASH_BURST_WORDS];
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memset(burst, padding, sizeof(burst));
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if (data_size > 0) {
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memcpy(burst, data32, data_size);
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data_size = 0;
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}
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if (flash_area_write_burst(area, offset, burst) != sectrue) {
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return secfalse;
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}
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}
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offset += FLASH_BURST_SIZE;
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total_size -= FLASH_BURST_SIZE;
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} else
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#endif
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{
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if (data_size >= FLASH_BLOCK_SIZE) {
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if (flash_area_write_block(area, offset, data32) != sectrue) {
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return secfalse;
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}
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data_size -= FLASH_BLOCK_SIZE;
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data32 += FLASH_BLOCK_WORDS;
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} else {
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uint32_t block[FLASH_BLOCK_WORDS];
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memset(block, padding, sizeof(block));
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if (data_size > 0) {
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memcpy(block, data32, data_size);
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data_size = 0;
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}
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if (flash_area_write_block(area, offset, block) != sectrue) {
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return secfalse;
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}
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}
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offset += FLASH_BLOCK_SIZE;
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total_size -= FLASH_BLOCK_SIZE;
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}
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}
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return sectrue;
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}
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secbool flash_area_erase(const flash_area_t *area,
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void (*progress)(int pos, int len)) {
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return flash_area_erase_bulk(area, 1, progress);
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}
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static secbool erase_sector(uint16_t sector) {
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secbool result = secfalse;
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if (sectrue != flash_unlock_write()) {
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return secfalse;
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}
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result = flash_sector_erase(sector);
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if (sectrue != flash_lock_write()) {
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return secfalse;
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}
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return result;
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}
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secbool 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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int total_sectors = 0;
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int done_sectors = 0;
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for (int a = 0; a < count; a++) {
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for (int i = 0; i < area[a].num_subareas; i++) {
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total_sectors += area[a].subarea[i].num_sectors;
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}
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}
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if (progress) {
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progress(0, total_sectors);
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}
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for (int a = 0; a < count; a++) {
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for (int s = 0; s < area[a].num_subareas; s++) {
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for (int i = 0; i < area[a].subarea[s].num_sectors; i++) {
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int sector = area[a].subarea[s].first_sector + i;
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if (sectrue != erase_sector(sector)) {
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return secfalse;
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}
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done_sectors++;
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if (progress) {
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progress(done_sectors, total_sectors);
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}
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}
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}
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}
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return sectrue;
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}
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secbool flash_area_erase_partial(const flash_area_t *area, uint32_t offset,
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uint32_t *bytes_erased) {
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uint32_t sector_offset = 0;
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*bytes_erased = 0;
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for (int s = 0; s < area->num_subareas; s++) {
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for (int i = 0; i < area->subarea[s].num_sectors; i++) {
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uint32_t sector = area->subarea[s].first_sector + i;
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uint32_t sector_size = flash_sector_size(sector, 1);
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if (offset == sector_offset) {
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if (sectrue != erase_sector(sector)) {
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return secfalse;
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}
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*bytes_erased = sector_size;
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return sectrue;
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}
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sector_offset += sector_size;
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}
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}
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if (offset == sector_offset) {
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return sectrue;
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}
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return secfalse;
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}
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