/*
 * Copyright (C) 2020 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#pragma once

#include <stdint.h>

#define APPLOADER_PORT "com.android.trusty.apploader"

enum apploader_command : uint32_t {
    APPLOADER_REQ_SHIFT = 1,
    APPLOADER_RESP_BIT = 1,

    APPLOADER_CMD_LOAD_APPLICATION = (0 << APPLOADER_REQ_SHIFT),
    APPLOADER_CMD_GET_VERSION = (1 << APPLOADER_REQ_SHIFT),
    APPLOADER_CMD_UNLOAD_APPLICATION = (2 << APPLOADER_REQ_SHIFT),
};

/**
 * enum apploader_error - error codes for apploader
 * @APPLOADER_NO_ERROR:                 no error
 * @APPLOADER_ERR_UNKNOWN_CMD:          unknown or not implemented command
 * @APPLOADER_ERR_INVALID_CMD:          invalid arguments or inputs passed to
 *                                      command
 * @APPLOADER_ERR_NO_MEMORY:            failed to allocate memory
 * @APPLOADER_ERR_VERIFICATION_FAILED:  failed to verify input application
 *                                      package for any reason, e.g., signature
 *                                      verification failed
 * @APPLOADER_ERR_LOADING_FAILED:       Trusty kernel or apploader service
 *                                      failed to load application
 * @APPLOADER_ERR_ALREADY_EXISTS:       application has already been loaded
 * @APPLOADER_ERR_INTERNAL:             miscellaneous or internal apploader
 *                                      error not covered by the above
 */
enum apploader_error : uint32_t {
    APPLOADER_NO_ERROR = 0,
    APPLOADER_ERR_UNKNOWN_CMD,
    APPLOADER_ERR_INVALID_CMD,
    APPLOADER_ERR_NO_MEMORY,
    APPLOADER_ERR_VERIFICATION_FAILED,
    APPLOADER_ERR_LOADING_FAILED,
    APPLOADER_ERR_ALREADY_EXISTS,
    APPLOADER_ERR_INTERNAL,
};

/**
 * apploader_header - Serial header for communicating with apploader
 * @cmd: the command; one of &enum apploader_command values.
 */
struct apploader_header {
    uint32_t cmd;
} __packed;

/**
 * apploader_load_app_req - Serial arguments for LOAD_APPLICATION command
 * @package_size: size of the application package.
 *
 * Load an application from a given memory region. The request message also
 * contains a handle for a memfd that contains the application package.
 *
 * The response is a &struct apploader_resp with the error code or
 * %APPLOADER_NO_ERROR on success.
 */
struct apploader_load_app_req {
    uint64_t package_size;
} __packed;

/**
 * apploader_resp - Common header for all apploader responses
 * @hdr - header with command value.
 * @error - error code returned by peer; one of &enum apploader_error values.
 *
 * This structure is followed by the response-specific payload, if the command
 * has one.
 */
struct apploader_resp {
    struct apploader_header hdr;
    uint32_t error;
} __packed;