trezor-firmware/core/embed/util/translations/translations.c

#include <trezor_model.h>
#include <trezor_rtl.h>

#include <sys/mpu.h>
#include <util/flash.h>
#include <util/translations.h>

#ifdef KERNEL_MODE

bool translations_write(const uint8_t* data, uint32_t offset, uint32_t len) {
  uint32_t size = translations_area_bytesize();
  if (offset > size || size - offset < len) {
    return false;
  }

  mpu_mode_t mpu_mode = mpu_reconfig(MPU_MODE_ASSETS);

  ensure(flash_unlock_write(), "translations_write unlock");
  // todo consider alignment
  ensure(flash_area_write_data_padded(&ASSETS_AREA, offset, data, len, 0xFF,
                                      FLASH_ALIGN(len)),
         "translations_write write");
  ensure(flash_lock_write(), "translations_write lock");

  mpu_restore(mpu_mode);

  return true;
}

const uint8_t* translations_read(uint32_t* len, uint32_t offset) {
  // TODO: _Static_assert was not happy with ASSETS_AREA.num_subareas == 1
  // error: expression in static assertion is not constant
  assert(ASSETS_AREA.num_subareas == 1);
  *len = flash_area_get_size(&ASSETS_AREA) - offset;
  return flash_area_get_address(&ASSETS_AREA, offset, 0);
}

void translations_erase(void) {
  mpu_mode_t mpu_mode = mpu_reconfig(MPU_MODE_ASSETS);
  ensure(flash_area_erase(&ASSETS_AREA, NULL), "translations erase");
  mpu_restore(mpu_mode);
}

uint32_t translations_area_bytesize(void) {
  return flash_area_get_size(&ASSETS_AREA);
}

#endif  // KERNEL_MODE