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mirror of https://github.com/trezor/trezor-firmware.git synced 2024-12-23 06:48:16 +00:00
trezor-firmware/embed/unix/flash.c

183 lines
5.0 KiB
C

/*
* Copyright (c) Jan Pochyla, SatoshiLabs
*
* Licensed under TREZOR License
* see LICENSE file for details
*/
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include "common.h"
#include "flash.h"
#ifndef FLASH_FILE
#define FLASH_FILE "/var/tmp/trezor.flash"
#endif
#define SECTOR_COUNT 24
#define FLASH_SIZE 0x200000
static const uint32_t sector_table[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, // - 0x08103FFF | 16 KiB
[13] = 0x08104000, // - 0x08107FFF | 16 KiB
[14] = 0x08108000, // - 0x0810BFFF | 16 KiB
[15] = 0x0810C000, // - 0x0810FFFF | 16 KiB
[16] = 0x08110000, // - 0x0811FFFF | 64 KiB
[17] = 0x08120000, // - 0x0813FFFF | 128 KiB
[18] = 0x08140000, // - 0x0815FFFF | 128 KiB
[19] = 0x08160000, // - 0x0817FFFF | 128 KiB
[20] = 0x08180000, // - 0x0819FFFF | 128 KiB
[21] = 0x081A0000, // - 0x081BFFFF | 128 KiB
[22] = 0x081C0000, // - 0x081DFFFF | 128 KiB
[23] = 0x081E0000, // - 0x081FFFFF | 128 KiB
[24] = 0x08200000, // last element - not a valid sector
};
static uint8_t *flash_buffer;
static void flash_exit(void)
{
int r = munmap(flash_buffer, FLASH_SIZE);
ensure(sectrue * (r == 0), "munmap failed");
}
void flash_init(void)
{
int r;
// check whether the file exists and it has the correct size
struct stat sb;
r = stat(FLASH_FILE, &sb);
// (re)create if non existant or wrong size
if (r != 0 || sb.st_size != FLASH_SIZE) {
int fd = open(FLASH_FILE, O_RDWR | O_CREAT | O_TRUNC, (mode_t)0600);
ensure(sectrue * (fd >= 0), "open failed");
for (int i = 0; i < FLASH_SIZE / 16; i++) {
ssize_t s = write(fd, "\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF", 16);
ensure(sectrue * (s >= 0), "write failed");
}
r = close(fd);
ensure(sectrue * (r == 0), "close failed");
}
// mmap file
int fd = open(FLASH_FILE, O_RDWR);
ensure(sectrue * (fd >= 0), "open failed");
void *map = mmap(0, FLASH_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
ensure(sectrue * (map != MAP_FAILED), "mmap failed");
flash_buffer = (uint8_t *)map;
atexit(flash_exit);
}
secbool flash_unlock(void)
{
return sectrue;
}
secbool flash_lock(void)
{
return sectrue;
}
const void *flash_get_address(uint8_t sector, uint32_t offset, uint32_t size)
{
if (sector >= SECTOR_COUNT) {
return NULL;
}
const uint32_t sector_size = sector_table[sector + 1] - sector_table[sector];
if (offset + size > sector_size) {
return NULL;
}
const uint32_t sector_offset = sector_table[sector] - sector_table[0];
return flash_buffer + sector_offset + offset;
}
secbool flash_erase_sectors(const uint8_t *sectors, int len, void (*progress)(int pos, int len))
{
if (progress) {
progress(0, len);
}
for (int i = 0; i < len; i++) {
const uint8_t sector = sectors[i];
const uint32_t offset = sector_table[sector] - sector_table[0];
const uint32_t size = sector_table[sector + 1] - sector_table[sector];
memset(flash_buffer + offset, 0xFF, size);
if (progress) {
progress(i + 1, len);
}
}
return sectrue;
}
secbool flash_write_byte(uint8_t sector, uint32_t offset, uint8_t data)
{
uint8_t *flash = (uint8_t *)flash_get_address(sector, offset, sizeof(data));
if (!flash) {
return secfalse;
}
if ((flash[0] & data) != data) {
return secfalse; // we cannot change zeroes to ones
}
flash[0] = data;
return sectrue;
}
secbool flash_write_word(uint8_t sector, uint32_t offset, uint32_t data)
{
if (offset % 4) { // we write only at 4-byte boundary
return secfalse;
}
uint32_t *flash = (uint32_t *)flash_get_address(sector, offset, sizeof(data));
if (!flash) {
return secfalse;
}
if ((flash[0] & data) != data) {
return secfalse; // we cannot change zeroes to ones
}
flash[0] = data;
return sectrue;
}
secbool flash_otp_read(uint8_t block, uint8_t offset, uint8_t *data, uint8_t datalen)
{
return secfalse;
}
secbool flash_otp_write(uint8_t block, uint8_t offset, const uint8_t *data, uint8_t datalen)
{
return secfalse;
}
secbool flash_otp_lock(uint8_t block)
{
return secfalse;
}
secbool flash_otp_is_locked(uint8_t block)
{
return secfalse;
}