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955 palkovsky 1
/*
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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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/* Lock ordering
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 *
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 * First the answerbox, then the phone
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 */
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#include <synch/condvar.h>
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#include <synch/mutex.h>
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#include <ipc/ipc.h>
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#include <errno.h>
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#include <mm/slab.h>
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#include <arch.h>
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#include <proc/task.h>
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#include <memstr.h>
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#include <debug.h>
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#include <print.h>
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#include <proc/thread.h>
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/* Open channel that is assigned automatically to new tasks */
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answerbox_t *ipc_phone_0 = NULL;
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static slab_cache_t *ipc_call_slab;
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/** Allocate & initialize call structure
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 *
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 * The call is initialized, so that the reply will be directed
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 * to TASK->answerbox
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 */
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call_t * ipc_call_alloc(void)
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{
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    call_t *call;
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    call = slab_alloc(ipc_call_slab, 0);
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    memsetb((__address)call, sizeof(*call), 0);
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    call->callerbox = &TASK->answerbox;
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    return call;
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}
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/** Initialize allocated call */
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void ipc_call_init(call_t *call)
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{
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    call->callerbox = &TASK->answerbox;
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    call->flags = IPC_CALL_STATIC_ALLOC;
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}
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/** Deallocate call stracuture */
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void ipc_call_free(call_t *call)
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{
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    slab_free(ipc_call_slab, call);
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}
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/** Initialize answerbox structure
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 */
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void ipc_answerbox_init(answerbox_t *box)
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{
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    mutex_initialize(&box->mutex);
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    condvar_initialize(&box->cv);
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    list_initialize(&box->connected_phones);
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    list_initialize(&box->calls);
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    list_initialize(&box->dispatched_calls);
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    list_initialize(&box->answers);
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}
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/** Initialize phone structure and connect phone to naswerbox
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 */
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void ipc_phone_init(phone_t *phone, answerbox_t *box)
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{
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    spinlock_initialize(&phone->lock, "phone_lock");
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    phone->callee = box;
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    mutex_lock(&box->mutex);
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    list_append(&phone->list, &box->connected_phones);
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    mutex_unlock(&box->mutex);
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}
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/** Disconnect phone from answerbox */
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void ipc_phone_destroy(phone_t *phone)
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{
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    answerbox_t *box = phone->callee;
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    ASSERT(box);
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    mutex_lock(&box->mutex);
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    list_remove(&phone->list);
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    mutex_unlock(&box->mutex);
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}
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/** Helper function to facilitate synchronous calls */
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void ipc_call_sync(phone_t *phone, call_t *request)
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{
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    answerbox_t sync_box;
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    ipc_answerbox_init(&sync_box);
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    /* We will receive data on special box */
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    request->callerbox = &sync_box;
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    ipc_call(phone, request);
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    ipc_wait_for_call(&sync_box, 0);
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}
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/** Send a asynchronous request using phone to answerbox
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 *
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 * @param phone Phone connected to answerbox
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 * @param request Request to be sent
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 */
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void ipc_call(phone_t *phone, call_t *request)
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{
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    answerbox_t *box = phone->callee;
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    ASSERT(box);
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    mutex_lock(&box->mutex);
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    list_append(&request->list, &box->calls);
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    mutex_unlock(&box->mutex);
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    condvar_signal(&box->cv);
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}
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/** Answer message back to phone
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 *
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 * @param box Answerbox that is answering the message
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 * @param request Modified request that is being sent back
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 */
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void ipc_answer(answerbox_t *box, call_t *request)
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{
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    answerbox_t *callerbox = request->callerbox;
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    request->flags |= IPC_CALL_ANSWERED;
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    mutex_lock(&box->mutex);
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    list_remove(&request->list);
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    mutex_unlock(&box->mutex);
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    mutex_lock(&callerbox->mutex);
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    list_append(&request->list, &callerbox->answers);
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    mutex_unlock(&callerbox->mutex);
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    condvar_signal(&callerbox->cv);
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}
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/** Wait for phone call
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 *
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 * @return Recived message address
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 * - to distinguish between call and answer, look at call->flags
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 */
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call_t * ipc_wait_for_call(answerbox_t *box, int flags)
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{
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    call_t *request;
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    mutex_lock(&box->mutex);
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    while (1) {
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        if (!list_empty(&box->answers)) {
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            /* Handle asynchronous answers */
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            request = list_get_instance(box->answers.next, call_t, list);
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            list_remove(&request->list);
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        } else if (!list_empty(&box->calls)) {
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            /* Handle requests */
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            request = list_get_instance(box->calls.next, call_t, list);
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            list_remove(&request->list);
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            /* Append request to dispatch queue */
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            list_append(&request->list, &box->dispatched_calls);
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        } else {
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            if (!(flags & IPC_WAIT_NONBLOCKING)) {
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                /* Wait for event to appear */
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                condvar_wait(&box->cv, &box->mutex);
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                continue;
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            }
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            request = NULL;
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        }
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        break;
955 palkovsky 200
    }
965 palkovsky 201
    mutex_unlock(&box->mutex);
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    return request;
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}
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/** Initilize ipc subsystem */
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void ipc_init(void)
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{
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    ipc_call_slab = slab_cache_create("ipc_call",
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                      sizeof(call_t),
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                      0,
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                      NULL, NULL, 0);
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}