Secure DPU: add folder for common headers

// Copyright (C) 2021 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.

cc_library_headers {

    name: "secure_dpu_headers",

    vendor: true,

    export_include_dirs: ["include"],

}

/*

 * Copyright 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>

/**

 * DOC: Secure DPU

 *

 * The Secure DPU works as the persistent channel between the non-secure and the

 * secure world. The channel is established during the boot up stage of the

 * non-secure world system. In general, the established channel allows the

 * secure world applications initiate requests or notifications to the non-secure

 * world.

 *

 * For particular devices, the secure world can only perform operations on the

 * display when in the TUI session if device-specific setup is done by the

 * non-secure world. Besides, the non-secure world could allocate framebuffer

 * for the secure world application if the memory is limited in the secure world

 * on specific devices.

 *

 * Currently, supported requests are to start / stop the secure display mode and

 * to allocate framebuffer.

 *

 * This header file needs to be synced on both the Trusty and the Android

 * codebase.

 */

#define SECURE_DPU_PORT_NAME "com.android.trusty.secure_dpu"

#define SECURE_DPU_MAX_MSG_SIZE 64

/**

 * enum secure_dpu_cmd - command identifiers for secure_fb interface

 * @SECURE_DPU_CMD_RESP_BIT:

 *      Message is a response.

 * @SECURE_DPU_CMD_REQ_SHIFT:

 *      Number of bits used by @SECURE_DPU_CMD_RESP_BIT.

 * @SECURE_DPU_CMD_START_SECURE_DISPLAY:

 *      Notify the system to start secure display mode

 * @SECURE_DPU_CMD_STOP_SECURE_DISPLAY:

 *      Notify the system to stop secure display mode

 * @SECURE_DPU_CMD_ALLOCATE_BUFFER:

 *      Request non-secure world to allocate the buffer

 */

enum secure_dpu_cmd {

    SECURE_DPU_CMD_RESP_BIT = 1,

    SECURE_DPU_CMD_REQ_SHIFT = 1,

    SECURE_DPU_CMD_START_SECURE_DISPLAY = (1 << SECURE_DPU_CMD_REQ_SHIFT),

    SECURE_DPU_CMD_STOP_SECURE_DISPLAY = (2 << SECURE_DPU_CMD_REQ_SHIFT),

    SECURE_DPU_CMD_ALLOCATE_BUFFER = (3 << SECURE_DPU_CMD_REQ_SHIFT),

};

/**

 * struct secure_dpu_allocate_buffer_req - payload for

 *                                         %SECURE_DPU_CMD_ALLOCATE_BUFFER

 *                                         request

 * @buffer_len: Requested length

 */

struct secure_dpu_allocate_buffer_req {

    uint64_t buffer_len;

};

/**

 * struct secure_dpu_allocate_buffer_resp - payload for

 *                                          %SECURE_DPU_CMD_ALLOCATE_BUFFER

 *                                          response

 * @buffer_len: Allocated length

 */

struct secure_dpu_allocate_buffer_resp {

    uint64_t buffer_len;

};

/**

 * struct secure_fb_req - common structure for secure_fb requests.

 * @cmd: Command identifier - one of &enum secure_dpu_cmd.

 */

struct secure_dpu_req {

    uint32_t cmd;

};

/**

 * struct secure_dpu_resp - common structure for secure_dpu responses.

 * @cmd:    Command identifier - %SECURE_DPU_CMD_RESP_BIT or'ed with the

 *                               command identifier of the corresponding

 *                               request.

 * @status: Status of requested operation. One of &enum secure_dpu_error.

 */

struct secure_dpu_resp {

    uint32_t cmd;

    int32_t status;

};

enum secure_dpu_error {

    SECURE_DPU_ERROR_OK = 0,

    SECURE_DPU_ERROR_FAIL = -1,

    SECURE_DPU_ERROR_UNINITIALIZED = -2,

    SECURE_DPU_ERROR_PARAMETERS = -3,

    SECURE_DPU_ERROR_NO_MEMORY = -4,

};