/*
 * Copyright (c) 2006 Ondrej Palkovsky
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup genericipc
 * @{
 */
/** @file
 */

#ifndef ABI_IPC_METHODS_H_
#define ABI_IPC_METHODS_H_

/* Well known phone descriptors */
#define PHONE_NS  0

/** Kernel IPC interfaces
 *
 */
#define IPC_IF_KERNEL  0

/** System-specific IPC methods
 *
 * These methods have special behaviour. These methods also
 * have the implicit kernel interface zero (0).
 *
 */

/** This message is sent to answerbox when the phone is hung up
 *
 * The numerical value zero (0) of this method is important,
 * so as the value can be easily tested in conditions.
 *
 */
#define IPC_M_PHONE_HUNGUP  0

/** Clone connection.
 *
 * The calling task clones one of its phones for the callee.
 *
 * - ARG1 - The caller sets ARG1 to the phone of the cloned connection.
 *        - The callee gets the new phone from ARG1.
 *
 * - on answer, the callee acknowledges the new connection by sending EOK back
 *   or the kernel closes it
 *
 */
#define IPC_M_CONNECTION_CLONE  1

/** Protocol for CONNECT - ME
 *
 * Through this call, the recipient learns about the new cloned connection.
 *
 * - ARG5 - the kernel sets ARG5 to contain the hash of the used phone
 * - on answer, the callee acknowledges the new connection by sending EOK back
 *   or the kernel closes it
 *
 */
#define IPC_M_CONNECT_ME  2

/** Protocol for CONNECT - TO - ME
 *
 * Calling process asks the callee to create a callback connection,
 * so that it can start initiating new messages.
 *
 * The protocol for negotiating is:
 * - sys_connect_to_me - sends a message IPC_M_CONNECT_TO_ME
 * - recipient         - upon receipt tries to allocate new phone
 *                       - if it fails, responds with ELIMIT
 *                     - passes call to userspace. If userspace
 *                       responds with error, phone is deallocated and
 *                       error is sent back to caller. Otherwise 
 *                       the call is accepted and the response is sent back.
 *                     - the hash of the client task is passed to userspace
 *                       (on the receiving side) as ARG4 of the call.
 *                     - the hash of the allocated phone is passed to userspace
 *                       (on the receiving side) as ARG5 of the call.
 *
 */
#define IPC_M_CONNECT_TO_ME  3

/** Protocol for CONNECT - ME - TO
 *
 * Calling process asks the callee to create for him a new connection.
 * E.g. the caller wants a name server to connect him to print server.
 *
 * The protocol for negotiating is:
 * - sys_connect_me_to - send a synchronous message to name server
 *                       indicating that it wants to be connected to some
 *                       service
 *                     - arg1/2/3 are user specified, arg5 contains
 *                       address of the phone that should be connected
 *                       (TODO: it leaks to userspace)
 *  - recipient        -  if ipc_answer == 0, then accept connection
 *                     -  otherwise connection refused
 *                     -  recepient may forward message.
 *
 */
#define IPC_M_CONNECT_ME_TO  4

/** Send as_area over IPC.
 * - ARG1 - source as_area base address
 * - ARG2 - size of source as_area (filled automatically by kernel)
 * - ARG3 - flags of the as_area being sent
 *
 * on answer, the recipient must set:
 * - ARG1 - dst as_area base adress
 *
 */
#define IPC_M_SHARE_OUT  5

/** Receive as_area over IPC.
 * - ARG1 - destination as_area base address
 * - ARG2 - destination as_area size
 * - ARG3 - user defined argument
 *
 * on answer, the recipient must set:
 *
 * - ARG1 - source as_area base address
 * - ARG2 - flags that will be used for sharing
 *
 */
#define IPC_M_SHARE_IN  6

/** Send data to another address space over IPC.
 * - ARG1 - source address space virtual address
 * - ARG2 - size of data to be copied, may be overriden by the recipient
 *
 * on answer, the recipient must set:
 *
 * - ARG1 - final destination address space virtual address
 * - ARG2 - final size of data to be copied
 *
 */
#define IPC_M_DATA_WRITE  7

/** Receive data from another address space over IPC.
 * - ARG1 - destination virtual address in the source address space
 * - ARG2 - size of data to be received, may be cropped by the recipient 
 *
 * on answer, the recipient must set:
 *
 * - ARG1 - source virtual address in the destination address space
 * - ARG2 - final size of data to be copied
 *
 */
#define IPC_M_DATA_READ  8

/** Debug the recipient.
 * - ARG1 - specifies the debug method (from udebug_method_t)
 * - other arguments are specific to the debug method
 *
 */
#define IPC_M_DEBUG  9

/** Last system IPC method */
#define IPC_M_LAST_SYSTEM  511

#endif

/** @}
 */