system/dev/tee/optee/util.cpp

// Copyright 2018 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "util.h"

#include <string.h>

#include <zircon/assert.h>

namespace optee {

Uuid::Uuid(const fuchsia_hardware_tee_Uuid& uuid) {
    data_[0] = static_cast<uint8_t>(uuid.time_low >> 24);
    data_[1] = static_cast<uint8_t>(uuid.time_low >> 16);
    data_[2] = static_cast<uint8_t>(uuid.time_low >> 8);
    data_[3] = static_cast<uint8_t>(uuid.time_low);
    data_[4] = static_cast<uint8_t>(uuid.time_mid >> 8);
    data_[5] = static_cast<uint8_t>(uuid.time_mid);
    data_[6] = static_cast<uint8_t>(uuid.time_hi_and_version >> 8);
    data_[7] = static_cast<uint8_t>(uuid.time_hi_and_version);
    ::memcpy(&data_[8], &uuid.clock_seq_and_node, sizeof(uuid.clock_seq_and_node));
}

void Uuid::ToUint64Pair(uint64_t* out_hi, uint64_t* out_low) const {
    ZX_DEBUG_ASSERT(out_hi);
    ZX_DEBUG_ASSERT(out_low);

    // REE and TEE always share the same endianness so the treatment of UUID bytes is the same on
    // both sides.
    ::memcpy(out_hi, data_, sizeof(*out_hi));
    ::memcpy(out_low, data_ + sizeof(*out_hi), sizeof(*out_low));
}

} // namespace optee