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trezor-firmware/legacy/flash.c

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/*
* This file is part of the Trezor project, https://trezor.io/
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*
* Copyright (c) SatoshiLabs
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <libopencm3/stm32/flash.h>
#include <string.h>
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#include "common.h"
#include "flash.h"
#include "flash_area.h"
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#include "memory.h"
#include "supervise.h"
#define STORAGE_AREAS_COUNT 2
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static const uint32_t FLASH_SECTOR_TABLE[FLASH_SECTOR_COUNT + 1] = {
[0] = 0x08000000, // - 0x08003FFF | 16 KiB
[1] = 0x08004000, // - 0x08007FFF | 16 KiB
[2] = 0x08008000, // - 0x0800BFFF | 16 KiB
[3] = 0x0800C000, // - 0x0800FFFF | 16 KiB
[4] = 0x08010000, // - 0x0801FFFF | 64 KiB
[5] = 0x08020000, // - 0x0803FFFF | 128 KiB
[6] = 0x08040000, // - 0x0805FFFF | 128 KiB
[7] = 0x08060000, // - 0x0807FFFF | 128 KiB
[8] = 0x08080000, // - 0x0809FFFF | 128 KiB
[9] = 0x080A0000, // - 0x080BFFFF | 128 KiB
[10] = 0x080C0000, // - 0x080DFFFF | 128 KiB
[11] = 0x080E0000, // - 0x080FFFFF | 128 KiB
[12] = 0x08100000, // last element - not a valid sector
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};
const flash_area_t STORAGE_AREAS[STORAGE_AREAS_COUNT] = {
{
.num_subareas = 1,
.subarea[0] =
{
.first_sector = 2,
.num_sectors = 1,
},
},
{
.num_subareas = 1,
.subarea[0] =
{
.first_sector = 3,
.num_sectors = 1,
},
},
};
static secbool flash_check_success(uint32_t status) {
return (status & (FLASH_SR_PGAERR | FLASH_SR_PGPERR | FLASH_SR_PGSERR |
FLASH_SR_WRPERR))
? secfalse
: sectrue;
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}
secbool flash_unlock_write(void) {
svc_flash_unlock();
return sectrue;
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}
secbool flash_lock_write(void) { return flash_check_success(svc_flash_lock()); }
const void *flash_get_address(uint16_t sector, uint32_t offset, uint32_t size) {
if (sector >= FLASH_SECTOR_COUNT) {
return NULL;
}
const uint32_t addr = FLASH_SECTOR_TABLE[sector] + offset;
const uint32_t next = FLASH_SECTOR_TABLE[sector + 1];
if (addr + size > next) {
return NULL;
}
return (const void *)FLASH_PTR(addr);
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}
uint32_t flash_sector_size(uint16_t first_sector, uint16_t sector_count) {
if (first_sector + sector_count >= FLASH_SECTOR_COUNT) {
return 0;
}
return FLASH_SECTOR_TABLE[first_sector + sector_count] -
FLASH_SECTOR_TABLE[first_sector];
}
uint16_t flash_sector_find(uint16_t first_sector, uint32_t offset) {
uint16_t sector = first_sector;
while (sector < FLASH_SECTOR_COUNT) {
uint32_t sector_size =
FLASH_SECTOR_TABLE[sector + 1] - FLASH_SECTOR_TABLE[sector];
if (offset < sector_size) {
break;
}
offset -= sector_size;
sector++;
}
return sector;
}
secbool flash_write_byte(uint16_t sector, uint32_t offset, uint8_t data) {
uint8_t *address = (uint8_t *)flash_get_address(sector, offset, 1);
if (address == NULL) {
return secfalse;
}
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if ((*address & data) != data) {
return secfalse;
}
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svc_flash_program(FLASH_CR_PROGRAM_X8);
*(volatile uint8_t *)address = data;
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if (*address != data) {
return secfalse;
}
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return sectrue;
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}
secbool flash_write_word(uint16_t sector, uint32_t offset, uint32_t data) {
uint32_t *address = (uint32_t *)flash_get_address(sector, offset, 4);
if (address == NULL) {
return secfalse;
}
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if (offset % 4 != 0) {
return secfalse;
}
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if ((*address & data) != data) {
return secfalse;
}
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svc_flash_program(FLASH_CR_PROGRAM_X32);
*(volatile uint32_t *)address = data;
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if (*address != data) {
return secfalse;
}
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return sectrue;
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}
secbool flash_write_block(uint16_t sector, uint32_t offset,
const flash_block_t block) {
return flash_write_word(sector, offset, block[0]);
}
secbool flash_sector_erase(uint16_t sector) {
svc_flash_erase_sector(sector);
return sectrue;
}