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trezor-firmware/legacy/emulator/memory.c

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/*
* This file is part of the Trezor project, https://trezor.io/
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*
* Copyright (C) 2017 Saleem Rashid <trezor@saleemrashid.com>
*
* This library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This library 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
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#include <assert.h>
#include <stdbool.h>
#include <string.h>
#include <unistd.h>
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#include "memory.h"
void flash_lock(void) { sync(); }
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void flash_unlock(void) {}
void flash_clear_status_flags(void) {}
void flash_lock_option_bytes(void) {}
void flash_unlock_option_bytes(void) {}
void flash_program_option_bytes(uint32_t data) { (void)data; }
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static ssize_t sector_to_offset(uint8_t sector) {
switch (sector) {
case 0:
return 0x0;
case 1:
return 0x4000;
case 2:
return 0x8000;
case 3:
return 0xC000;
case 4:
return 0x10000;
case 5:
return 0x20000;
case 6:
return 0x40000;
case 7:
return 0x60000;
case 8:
return 0x80000;
default:
return -1;
}
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}
static void *sector_to_address(uint8_t sector) {
ssize_t offset = sector_to_offset(sector);
if (offset < 0) {
return NULL;
}
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return (void *)FLASH_PTR(FLASH_ORIGIN + offset);
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}
static ssize_t sector_to_size(uint8_t sector) {
ssize_t start = sector_to_offset(sector);
if (start < 0) {
return -1;
}
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ssize_t end = sector_to_offset(sector + 1);
if (end < 0) {
return -1;
}
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return end - start;
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}
void flash_erase_sector(uint8_t sector, uint32_t program_size) {
(void)program_size;
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void *address = sector_to_address(sector);
if (address == NULL) {
return;
}
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ssize_t size = sector_to_size(sector);
if (size < 0) {
return;
}
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memset(address, 0xFF, size);
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}
void flash_erase_all_sectors(uint32_t program_size) {
(void)program_size;
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memset(emulator_flash_base, 0xFF, FLASH_TOTAL_SIZE);
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}
void flash_program_word(uint32_t address, uint32_t data) {
*(volatile uint32_t *)FLASH_PTR(address) = data;
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}
void flash_program_byte(uint32_t address, uint8_t data) {
*(volatile uint8_t *)FLASH_PTR(address) = data;
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}
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static bool flash_locked = true;
void svc_flash_unlock(void) {
assert(flash_locked);
flash_locked = false;
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}
void svc_flash_program(uint32_t size) {
(void)size;
assert(!flash_locked);
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}
void svc_flash_erase_sector(uint8_t sector) {
assert(!flash_locked);
assert(sector >= FLASH_STORAGE_SECTOR_FIRST &&
sector <= FLASH_STORAGE_SECTOR_LAST);
flash_erase_sector(sector, 3);
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}
uint32_t svc_flash_lock(void) {
assert(!flash_locked);
flash_locked = true;
sync();
return 0;
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}