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136 lines
3.8 KiB
136 lines
3.8 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 <libopencm3/stm32/flash.h>
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#include <string.h>
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#include "common.h"
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#include "flash.h"
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#include "memory.h"
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#include "supervise.h"
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static const uint32_t FLASH_SECTOR_TABLE[FLASH_SECTOR_COUNT + 1] = {
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[0] = 0x08000000, // - 0x08003FFF | 16 KiB
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[1] = 0x08004000, // - 0x08007FFF | 16 KiB
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[2] = 0x08008000, // - 0x0800BFFF | 16 KiB
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[3] = 0x0800C000, // - 0x0800FFFF | 16 KiB
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[4] = 0x08010000, // - 0x0801FFFF | 64 KiB
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[5] = 0x08020000, // - 0x0803FFFF | 128 KiB
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[6] = 0x08040000, // - 0x0805FFFF | 128 KiB
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[7] = 0x08060000, // - 0x0807FFFF | 128 KiB
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[8] = 0x08080000, // - 0x0809FFFF | 128 KiB
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[9] = 0x080A0000, // - 0x080BFFFF | 128 KiB
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[10] = 0x080C0000, // - 0x080DFFFF | 128 KiB
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[11] = 0x080E0000, // - 0x080FFFFF | 128 KiB
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[12] = 0x08100000, // last element - not a valid sector
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};
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static secbool flash_check_success(uint32_t status) {
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return (status & (FLASH_SR_PGAERR | FLASH_SR_PGPERR | FLASH_SR_PGSERR |
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FLASH_SR_WRPERR))
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? secfalse
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: sectrue;
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}
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secbool flash_unlock_write(void) {
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svc_flash_unlock();
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return sectrue;
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}
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secbool flash_lock_write(void) { return flash_check_success(svc_flash_lock()); }
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const void *flash_get_address(uint8_t sector, uint32_t offset, uint32_t size) {
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if (sector >= FLASH_SECTOR_COUNT) {
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return NULL;
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}
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const uint32_t addr = FLASH_SECTOR_TABLE[sector] + offset;
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const uint32_t next = FLASH_SECTOR_TABLE[sector + 1];
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if (addr + size > next) {
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return NULL;
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}
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return (const void *)FLASH_PTR(addr);
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}
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uint32_t flash_sector_size(uint8_t sector) {
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if (sector >= FLASH_SECTOR_COUNT) {
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return 0;
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}
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return FLASH_SECTOR_TABLE[sector + 1] - FLASH_SECTOR_TABLE[sector];
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}
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secbool flash_erase(uint8_t sector) {
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ensure(flash_unlock_write(), NULL);
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svc_flash_erase_sector(sector);
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ensure(flash_lock_write(), NULL);
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// Check whether the sector was really deleted (contains only 0xFF).
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const uint32_t addr_start = FLASH_SECTOR_TABLE[sector],
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addr_end = FLASH_SECTOR_TABLE[sector + 1];
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for (uint32_t addr = addr_start; addr < addr_end; addr += 4) {
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if (*((const uint32_t *)FLASH_PTR(addr)) != 0xFFFFFFFF) {
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return secfalse;
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}
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}
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return sectrue;
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}
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secbool flash_write_byte(uint8_t sector, uint32_t offset, uint8_t data) {
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uint8_t *address = (uint8_t *)flash_get_address(sector, offset, 1);
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if (address == NULL) {
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return secfalse;
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}
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if ((*address & data) != data) {
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return secfalse;
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}
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svc_flash_program(FLASH_CR_PROGRAM_X8);
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*(volatile uint8_t *)address = data;
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if (*address != data) {
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return secfalse;
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}
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return sectrue;
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}
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secbool flash_write_word(uint8_t sector, uint32_t offset, uint32_t data) {
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uint32_t *address = (uint32_t *)flash_get_address(sector, offset, 4);
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if (address == NULL) {
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return secfalse;
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}
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if (offset % 4 != 0) {
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return secfalse;
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}
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if ((*address & data) != data) {
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return secfalse;
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}
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svc_flash_program(FLASH_CR_PROGRAM_X32);
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*(volatile uint32_t *)address = data;
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if (*address != data) {
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return secfalse;
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}
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return sectrue;
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}
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