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/*
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 * Copyright (C) 2006 Ondrej Palkovsky
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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#ifndef __IPC_H__
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#define __IPC_H__
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/* Length of data being transfered with IPC call */
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/* - the uspace may not be able to utilize full length */
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#define IPC_CALL_LEN    4
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/** Maximum active async calls per thread */
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#define IPC_MAX_ASYNC_CALLS  4
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/* Flags for calls */
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#define IPC_CALL_ANSWERED     (1<<0) /**< This is answer to a call */
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#define IPC_CALL_STATIC_ALLOC (1<<1) /**< This call will not be freed on error */
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#define IPC_CALL_DISPATCHED   (1<<2) /**< Call is in dispatch queue */
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#define IPC_CALL_DISCARD_ANSWER (1<<3) /**< Answer will not be passed to
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                    * userspace, will be discarded */
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/* Flags for ipc_wait_for_call */
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#define IPC_WAIT_NONBLOCKING   1
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/* Flags of callid (the addresses are aligned at least to 4,
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 * that is why we can use bottom 2 bits of the call address
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 */
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#define IPC_CALLID_ANSWERED       1 /**< Type of this msg is 'answer' */
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#define IPC_CALLID_NOTIFICATION   2 /**< Type of this msg is 'notification' */
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/* Return values from IPC_ASYNC */
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#define IPC_CALLRET_FATAL         -1
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#define IPC_CALLRET_TEMPORARY     -2
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/* Macros for manipulating calling data */
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#define IPC_SET_RETVAL(data, retval)   ((data).args[0] = (retval))
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#define IPC_SET_METHOD(data, val)   ((data).args[0] = (val))
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#define IPC_SET_ARG1(data, val)   ((data).args[1] = (val))
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#define IPC_SET_ARG2(data, val)   ((data).args[2] = (val))
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#define IPC_SET_ARG3(data, val)   ((data).args[3] = (val))
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#define IPC_GET_METHOD(data)           ((data).args[0])
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#define IPC_GET_RETVAL(data)           ((data).args[0])
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#define IPC_GET_ARG1(data)              ((data).args[1])
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#define IPC_GET_ARG2(data)              ((data).args[2])
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#define IPC_GET_ARG3(data)              ((data).args[3])
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/* Well known phone descriptors */
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#define PHONE_NS              0
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/* System-specific methods - only through special syscalls
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 * These methods have special behaviour
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 */
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/** Protocol for CONNECT - TO - ME
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 *
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 * Calling process asks the callee to create a callback connection,
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 * so that it can start initiating new messages.
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 *
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 * The protocol for negotiating is:
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 * - sys_connect_to_me - sends a message IPC_M_CONNECTTOME
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 * - sys_wait_for_call - upon receipt tries to allocate new phone
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 *                       - if it fails, responds with ELIMIT
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 *                     - passes call to userspace. If userspace
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 *                       responds with error, phone is deallocated and
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 *                       error is sent back to caller. Otherwise
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 *                       the call is accepted and the response is sent back.
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 *                     - the allocated phoneid is passed to userspace
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 *                       (on the receiving sid) as ARG3 of the call.
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 *                     - the caller obtains taskid of the called thread
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 */
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#define IPC_M_CONNECT_TO_ME     1
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/** Protocol for CONNECT - ME - TO
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 *
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 * Calling process asks the callee to create for him a new connection.
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 * E.g. the caller wants a name server to connect him to print server.
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 *
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 * The protocol for negotiating is:
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 * - sys_connect_me_to - send a synchronous message to name server
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 *                       indicating that it wants to be connected to some
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 *                       service
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 *                     - arg1/2 are user specified, arg3 contains
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 *                       address of the phone that should be connected
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 *                       (TODO: it leaks to userspace)
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 *   recepient         -  if ipc_answer == 0, then accept connection
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 *                     -  otherwise connection refused
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 *                     -  recepient may forward message. Forwarding
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 *                        system message
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 *
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 */
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#define IPC_M_CONNECT_ME_TO     2
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/** This message is sent to answerbox when the phone
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 * is hung up
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 */
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#define IPC_M_PHONE_HUNGUP      3
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/* Well-known methods */
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#define IPC_M_LAST_SYSTEM     511
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#define IPC_M_PING            512
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/* User methods */
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#define FIRST_USER_METHOD     1024
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#ifdef KERNEL
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#include <synch/mutex.h>
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#include <synch/condvar.h>
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#include <adt/list.h>
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#define IPC_MAX_PHONES  16
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typedef struct answerbox_s answerbox_t;
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typedef struct phone_s phone_t;
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typedef struct {
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    __native args[IPC_CALL_LEN];
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    phone_t *phone;
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}ipc_data_t;
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struct answerbox_s {
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    SPINLOCK_DECLARE(lock);
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    task_t *task;
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    waitq_t wq;
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    link_t connected_phones; /**< Phones connected to this answerbox */
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    link_t calls;            /**< Received calls */
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    link_t dispatched_calls; /* Should be hash table in the future */
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    link_t answers;          /**< Answered calls */
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};
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struct phone_s {
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    SPINLOCK_DECLARE(lock);
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    link_t list;
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    answerbox_t *callee;
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    int busy;
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    atomic_t active_calls;
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};
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typedef struct {
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    link_t list;
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    int flags;
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    /* Identification of the caller */
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    task_t *sender;
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    /* The caller box is different from sender->answerbox
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     * for synchronous calls
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     */
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    answerbox_t *callerbox;
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    ipc_data_t data;
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}call_t;
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extern void ipc_init(void);
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extern call_t * ipc_wait_for_call(answerbox_t *box, int flags);
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extern void ipc_answer(answerbox_t *box, call_t *request);
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extern void ipc_call(phone_t *phone, call_t *request);
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extern void ipc_call_sync(phone_t *phone, call_t *request);
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extern void ipc_phone_init(phone_t *phone);
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extern void ipc_phone_connect(phone_t *phone, answerbox_t *box);
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extern void ipc_call_free(call_t *call);
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extern call_t * ipc_call_alloc(void);
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extern void ipc_answerbox_init(answerbox_t *box);
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extern void ipc_call_static_init(call_t *call);
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extern void task_print_list(void);
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extern void ipc_forward(call_t *call, phone_t *newphone, answerbox_t *oldbox);
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extern answerbox_t *ipc_phone_0;
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extern void ipc_cleanup(task_t *task);
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extern int ipc_phone_hangup(phone_t *phone);
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#endif
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#endif