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/*

 * 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.

 */ 

#include <ipc.h>

#include <libc.h>

#include <malloc.h>

#include <errno.h>

#include <list.h>

#include <stdio.h>

#include <unistd.h>

#include <futex.h>

/** Structure used for keeping track of sent async msgs 

 * and queing unsent msgs

 *

 */

typedef struct {

	link_t list;

	ipc_async_callback_t callback;

	void *private;

	union {

		ipc_callid_t callid;

		struct {

			ipc_call_t data;

			int phoneid;

		} msg;

	}u;

} async_call_t;

LIST_INITIALIZE(dispatched_calls);

LIST_INITIALIZE(queued_calls);

static atomic_t ipc_futex;

void _ipc_init(void)

{

	futex_initialize(&ipc_futex, 1);

}

int ipc_call_sync(int phoneid, ipcarg_t method, ipcarg_t arg1, 

		  ipcarg_t *result)

{

	ipc_call_t resdata;

	int callres;

	callres = __SYSCALL4(SYS_IPC_CALL_SYNC_FAST, phoneid, method, arg1,

			     (sysarg_t)&resdata);

	if (callres)

		return callres;

	if (result)

		*result = IPC_GET_ARG1(resdata);

	return IPC_GET_RETVAL(resdata);

}

int ipc_call_sync_3(int phoneid, ipcarg_t method, ipcarg_t arg1,

		    ipcarg_t arg2, ipcarg_t arg3,

		    ipcarg_t *result1, ipcarg_t *result2, ipcarg_t *result3)

{

	ipc_call_t data;

	int callres;

	IPC_SET_METHOD(data, method);

	IPC_SET_ARG1(data, arg1);

	IPC_SET_ARG2(data, arg2);

	IPC_SET_ARG3(data, arg3);

	callres = __SYSCALL3(SYS_IPC_CALL_SYNC, phoneid, (sysarg_t)&data,

			     (sysarg_t)&data);

	if (callres)

		return callres;

	if (result1)

		*result1 = IPC_GET_ARG1(data);

	if (result2)

		*result2 = IPC_GET_ARG2(data);

	if (result3)

		*result3 = IPC_GET_ARG3(data);

	return IPC_GET_RETVAL(data);

}

/** Syscall to send asynchronous message */

static	ipc_callid_t _ipc_call_async(int phoneid, ipc_call_t *data)

{

	return __SYSCALL2(SYS_IPC_CALL_ASYNC, phoneid, (sysarg_t)data);

}

/** Send asynchronous message

 *

 * - if fatal error, call callback handler with proper error code

 * - if message cannot be temporarily sent, add to queue

 */

void ipc_call_async_2(int phoneid, ipcarg_t method, ipcarg_t arg1,

		      ipcarg_t arg2, void *private,

		      ipc_async_callback_t callback)

{

	async_call_t *call;

	ipc_callid_t callid;

	call = malloc(sizeof(*call));

	if (!call) {

		callback(private, ENOMEM, NULL);

		return;

	}

	callid = __SYSCALL4(SYS_IPC_CALL_ASYNC_FAST, phoneid, method, arg1, arg2);

	if (callid == IPC_CALLRET_FATAL) {

		/* Call asynchronous handler with error code */

		callback(private, ENOENT, NULL);

		free(call);

		return;

	}

	call->callback = callback;

	call->private = private;

	if (callid == IPC_CALLRET_TEMPORARY) {

		/* Add asynchronous call to queue of non-dispatched async calls */

		call->u.msg.phoneid = phoneid;

		IPC_SET_METHOD(call->u.msg.data, method);

		IPC_SET_ARG1(call->u.msg.data, arg1);

		IPC_SET_ARG2(call->u.msg.data, arg2);

		futex_down(&ipc_futex);

		list_append(&call->list, &queued_calls);

		futex_up(&ipc_futex);

		return;

	}

	call->u.callid = callid;

	/* Add call to list of dispatched calls */

	futex_down(&ipc_futex);

	list_append(&call->list, &dispatched_calls);

	futex_up(&ipc_futex);

}

/** Send a fast answer to a received call.

 *

 * The fast answer makes use of passing retval and first two arguments in registers.

 * If you need to return more, use the ipc_answer() instead.

 *

 * @param callid ID of the call being answered.

 * @param retval Return value.

 * @param arg1 First return argument.

 * @param arg2 Second return argument.

 *

 * @return Zero on success or a value from @ref errno.h on failure.

 */

ipcarg_t ipc_answer_fast(ipc_callid_t callid, ipcarg_t retval, ipcarg_t arg1,

		ipcarg_t arg2)

{

	return __SYSCALL4(SYS_IPC_ANSWER_FAST, callid, retval, arg1, arg2);

}

/** Send a full answer to a received call.

 *

 * @param callid ID of the call being answered.

 * @param call Call data. Must be already initialized by the responder.

 *

 * @return Zero on success or a value from @ref errno.h on failure.

 */

ipcarg_t ipc_answer(ipc_callid_t callid, ipc_call_t *call)

{

	return __SYSCALL2(SYS_IPC_ANSWER, callid, (sysarg_t) call);

}

/** Try to dispatch queed calls from async queue */

static void try_dispatch_queued_calls(void)

{

	async_call_t *call;

	ipc_callid_t callid;

	futex_down(&ipc_futex);

	while (!list_empty(&queued_calls)) {

		call = list_get_instance(queued_calls.next, async_call_t,

					 list);

		callid = _ipc_call_async(call->u.msg.phoneid,

					 &call->u.msg.data);

		if (callid == IPC_CALLRET_TEMPORARY)

			break;

		list_remove(&call->list);

		if (callid == IPC_CALLRET_FATAL) {

			futex_up(&ipc_futex);

			call->callback(call->private, ENOENT, NULL);

			free(call);

			futex_down(&ipc_futex);

		} else {

			call->u.callid = callid;

			list_append(&call->list, &dispatched_calls);

		}

	}

	futex_up(&ipc_futex);

}

/** Handle received answer

 *

 * TODO: Make it use hash table

 *

 * @param callid Callid (with first bit set) of the answered call

 */

static void handle_answer(ipc_callid_t callid, ipc_call_t *data)

{

	link_t *item;

	async_call_t *call;

	callid &= ~IPC_CALLID_ANSWERED;

	futex_down(&ipc_futex);

	for (item = dispatched_calls.next; item != &dispatched_calls;

	     item = item->next) {

		call = list_get_instance(item, async_call_t, list);

		if (call->u.callid == callid) {

			list_remove(&call->list);

			futex_up(&ipc_futex);

			call->callback(call->private, 

				       IPC_GET_RETVAL(*data),

				       data);

			return;

		}

	}

	futex_up(&ipc_futex);

	printf("Received unidentified answer: %P!!!\n", callid);

}

/** Wait for IPC call and return

 *

 * - dispatch ASYNC reoutines in the background

 * @param data Space where the message is stored

 * @return Callid or 0 if nothing available and started with 

 *         IPC_WAIT_NONBLOCKING

 */

ipc_callid_t ipc_wait_for_call(ipc_call_t *call, int flags)

{

	ipc_callid_t callid;

	do {

		try_dispatch_queued_calls();

		callid = __SYSCALL2(SYS_IPC_WAIT, (sysarg_t)call, flags);

		/* Handle received answers */

		if (callid & IPC_CALLID_ANSWERED)

			handle_answer(callid, call);

	} while (callid & IPC_CALLID_ANSWERED);

	return callid;

}

/** Ask destination to do a callback connection

 *

 * @return 0 - OK, error code

 */

int ipc_connect_to_me(int phoneid, int arg1, int arg2, ipcarg_t *phone)

{

	return ipc_call_sync_3(phoneid, IPC_M_CONNECT_TO_ME, arg1,

			       arg2, 0, 0, 0, phone);

}

/** Ask through phone for a new connection to some service

 *

 * @return new phoneid - OK, error code

 */

int ipc_connect_me_to(int phoneid, int arg1, int arg2)

{

	ipcarg_t newphid;

	int res;

	res =  ipc_call_sync_3(phoneid, IPC_M_CONNECT_ME_TO, arg1,

			       arg2, 0, 0, 0, &newphid);

	if (res)

		return res;

	return newphid;

}

/* Hang up specified phone */

int ipc_hangup(int phoneid)

{

	return __SYSCALL1(SYS_IPC_HANGUP, phoneid);

}

int ipc_register_irq(int irq, irq_code_t *ucode)

{

	return __SYSCALL2(SYS_IPC_REGISTER_IRQ, irq, (sysarg_t) ucode);

}

int ipc_unregister_irq(int irq)

{

	return __SYSCALL1(SYS_IPC_UNREGISTER_IRQ, irq);

}

int ipc_forward_fast(ipc_callid_t callid, int phoneid, int method, ipcarg_t arg1)

{

	return __SYSCALL4(SYS_IPC_FORWARD_FAST, callid, phoneid, method, arg1);

}

/** Open shared memory connection over specified phoneid

 *

 * 

 * Allocates AS_area, notify the other side about our intention

 * to open the connection

 *

 * @return Connection id identifying this connection

 */

//int ipc_dgr_open(int pohoneid, size_t bufsize)

//{

	/* Find new file descriptor in local descriptor table */

	/* Create AS_area, initialize structures */

	/* Send AS to other side, handle error states */

//}

/*

void ipc_dgr_close(int cid)

{

}

void * ipc_dgr_alloc(int cid, size_t size)

{

}

void ipc_dgr_free(int cid, void *area)

{

}

int ipc_dgr_send(int cid, void *area)

{

}

int ipc_dgr_send_data(int cid, void *data, size_t size)

{

}

*/