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trezor-firmware/legacy/emulator/setup.c
2020-02-12 13:31:31 +01:00

110 lines
2.6 KiB
C

/*
* This file is part of the Trezor project, https://trezor.io/
*
* 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/>.
*/
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <unistd.h>
#include <libopencm3/stm32/flash.h>
#include "memory.h"
#include "oled.h"
#include "rng.h"
#include "setup.h"
#include "timer.h"
#define EMULATOR_FLASH_FILE "emulator.img"
#ifndef RANDOM_DEV_FILE
#define RANDOM_DEV_FILE "/dev/urandom"
#endif
uint8_t *emulator_flash_base = NULL;
uint32_t __stack_chk_guard;
static int random_fd = -1;
static void setup_urandom(void);
static void setup_flash(void);
void setup(void) {
setup_urandom();
setup_flash();
}
void __attribute__((noreturn)) shutdown(void) {
sleep(5);
exit(4);
}
void emulatorRandom(void *buffer, size_t size) {
ssize_t n = 0, len = 0;
do {
n = read(random_fd, (char *)buffer + len, size - len);
if (n < 0) {
perror("Failed to read " RANDOM_DEV_FILE);
exit(1);
}
len += n;
} while (len != (ssize_t)size);
}
static void setup_urandom(void) {
random_fd = open(RANDOM_DEV_FILE, O_RDONLY);
if (random_fd < 0) {
perror("Failed to open " RANDOM_DEV_FILE);
exit(1);
}
}
static void setup_flash(void) {
int fd = open(EMULATOR_FLASH_FILE, O_RDWR | O_SYNC | O_CREAT, 0644);
if (fd < 0) {
perror("Failed to open flash emulation file");
exit(1);
}
off_t length = lseek(fd, 0, SEEK_END);
if (length < 0) {
perror("Failed to read length of flash emulation file");
exit(1);
}
emulator_flash_base =
mmap(NULL, FLASH_TOTAL_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
if (emulator_flash_base == MAP_FAILED) {
perror("Failed to map flash emulation file");
exit(1);
}
if (length < FLASH_TOTAL_SIZE) {
if (ftruncate(fd, FLASH_TOTAL_SIZE) != 0) {
perror("Failed to initialize flash emulation file");
exit(1);
}
/* Initialize the flash */
flash_erase_all_sectors(FLASH_CR_PROGRAM_X32);
}
}