trezor-firmware/legacy/emulator/memory.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 <assert.h>
#include <stdbool.h>
#include <string.h>
#include <unistd.h>

#include "memory.h"

void flash_lock(void) { sync(); }

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; }

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;
  }
}

static void *sector_to_address(uint8_t sector) {
  ssize_t offset = sector_to_offset(sector);
  if (offset < 0) {
    return NULL;
  }

  return (void *)FLASH_PTR(FLASH_ORIGIN + offset);
}

static ssize_t sector_to_size(uint8_t sector) {
  ssize_t start = sector_to_offset(sector);
  if (start < 0) {
    return -1;
  }

  ssize_t end = sector_to_offset(sector + 1);
  if (end < 0) {
    return -1;
  }

  return end - start;
}

void flash_erase_sector(uint8_t sector, uint32_t program_size) {
  (void)program_size;

  void *address = sector_to_address(sector);
  if (address == NULL) {
    return;
  }

  ssize_t size = sector_to_size(sector);
  if (size < 0) {
    return;
  }

  memset(address, 0xFF, size);
}

void flash_erase_all_sectors(uint32_t program_size) {
  (void)program_size;

  memset(emulator_flash_base, 0xFF, FLASH_TOTAL_SIZE);
}

void flash_program_word(uint32_t address, uint32_t data) {
  *(volatile uint32_t *)FLASH_PTR(address) = data;
}

void flash_program_byte(uint32_t address, uint8_t data) {
  *(volatile uint8_t *)FLASH_PTR(address) = data;
}

static bool flash_locked = true;
void svc_flash_unlock(void) {
  assert(flash_locked);
  flash_locked = false;
}
void svc_flash_program(uint32_t size) {
  (void)size;
  assert(!flash_locked);
}
void svc_flash_erase_sector(uint16_t sector) {
  assert(!flash_locked);
  assert(sector >= FLASH_STORAGE_SECTOR_FIRST &&
         sector <= FLASH_STORAGE_SECTOR_LAST);
  flash_erase_sector(sector, 3);
}
uint32_t svc_flash_lock(void) {
  assert(!flash_locked);
  flash_locked = true;
  sync();
  return 0;
}