mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-12-20 21:38:26 +00:00
109 lines
2.6 KiB
C
109 lines
2.6 KiB
C
/*
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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) 2017 Saleem Rashid <trezor@saleemrashid.com>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser 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 library 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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/mman.h>
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#include <unistd.h>
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#include <libopencm3/stm32/flash.h>
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#include "memory.h"
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#include "oled.h"
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#include "rng.h"
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#include "setup.h"
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#include "timer.h"
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#define EMULATOR_FLASH_FILE "emulator.img"
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#ifndef RANDOM_DEV_FILE
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#define RANDOM_DEV_FILE "/dev/urandom"
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#endif
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uint8_t *emulator_flash_base = NULL;
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uint32_t __stack_chk_guard;
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static int random_fd = -1;
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static void setup_urandom(void);
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static void setup_flash(void);
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void setup(void) {
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setup_urandom();
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setup_flash();
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}
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void __attribute__((noreturn)) shutdown(void) {
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for (;;) pause();
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}
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void emulatorRandom(void *buffer, size_t size) {
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ssize_t n = 0, len = 0;
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do {
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n = read(random_fd, (char *)buffer + len, size - len);
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if (n < 0) {
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perror("Failed to read " RANDOM_DEV_FILE);
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exit(1);
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}
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len += n;
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} while (len != (ssize_t)size);
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}
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static void setup_urandom(void) {
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random_fd = open(RANDOM_DEV_FILE, O_RDONLY);
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if (random_fd < 0) {
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perror("Failed to open " RANDOM_DEV_FILE);
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exit(1);
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}
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}
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static void setup_flash(void) {
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int fd = open(EMULATOR_FLASH_FILE, O_RDWR | O_SYNC | O_CREAT, 0644);
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if (fd < 0) {
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perror("Failed to open flash emulation file");
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exit(1);
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}
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off_t length = lseek(fd, 0, SEEK_END);
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if (length < 0) {
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perror("Failed to read length of flash emulation file");
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exit(1);
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}
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emulator_flash_base =
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mmap(NULL, FLASH_TOTAL_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
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if (emulator_flash_base == MAP_FAILED) {
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perror("Failed to map flash emulation file");
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exit(1);
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}
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if (length < FLASH_TOTAL_SIZE) {
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if (ftruncate(fd, FLASH_TOTAL_SIZE) != 0) {
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perror("Failed to initialize flash emulation file");
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exit(1);
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}
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/* Initialize the flash */
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flash_erase_all_sectors(FLASH_CR_PROGRAM_X32);
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}
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}
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