/*
 * Copyright 2005-2007, Ingo Weinhold <bonefish@cs.tu-berlin.de>.
 * All rights reserved. Distributed under the terms of the MIT License.
 */
#ifndef _BOOT_REMOTE_DISK_DEFS_H
#define _BOOT_REMOTE_DISK_DEFS_H


#include <inttypes.h>


enum {
        REMOTE_DISK_SERVER_PORT = 8765,
        REMOTE_DISK_BLOCK_SIZE  = 1024,
};

enum {
        // requests

        REMOTE_DISK_HELLO_REQUEST       = 0,
                // port: client port

        REMOTE_DISK_READ_REQUEST        = 1,
                // port: client port
                // offset: byte offset of data to read
                // size: number of bytes to read (server might serve more, though)

        REMOTE_DISK_WRITE_REQUEST       = 2,
                // port: client port
                // offset: byte offset of data to write
                // size: number of bytes to write
                // data: the data

        // replies

        REMOTE_DISK_HELLO_REPLY         = 3,
                // offset: disk size

        REMOTE_DISK_READ_REPLY          = 4,    // port unused
                // offset: byte offset of read data
                // size: number of bytes of data read; < 0 => error
                // data: read data

        REMOTE_DISK_WRITE_REPLY         = 5,    // port, data unused
                // offset: byte offset of data written
                // size: number of bytes of data written; < 0 => error
};

// errors
enum {
        REMOTE_DISK_IO_ERROR    = -1,
        REMOTE_DISK_BAD_REQUEST = -2,
};

struct remote_disk_header {
        uint64_t        offset;
        uint64_t        request_id;
        int16_t         size;
        uint16_t        port;
        uint8_t         command;
        uint8_t         data[0];
} __attribute__ ((__packed__));

#endif  // _BOOT_REMOTE_DISK_DEFS_H