WebSVN – HelenOS-historic – Diff – /kernel/trunk/generic/src/ipc/ipc.c


/*
 * 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 IPC
  * @ingroup kernel
  * @brief Interprocess communication protocol
 * @{
 */
/** @file
 */
 
/* Lock ordering
 *
 * First the answerbox, then the phone
 */
 
#include <synch/spinlock.h>
#include <synch/waitq.h>
#include <synch/synch.h>
#include <ipc/ipc.h>
#include <errno.h>
#include <mm/slab.h>
#include <arch.h>
#include <proc/task.h>
#include <memstr.h>
#include <debug.h>
 
#include <print.h>
#include <proc/thread.h>
#include <arch/interrupt.h>
#include <ipc/irq.h>
 
/* Open channel that is assigned automatically to new tasks */
answerbox_t *ipc_phone_0 = NULL;
 
static slab_cache_t *ipc_call_slab;
 
/* Initialize new call */
static void _ipc_call_init(call_t *call)
{
    memsetb((__address)call, sizeof(*call), 0);
    call->callerbox = &TASK->answerbox;
    call->sender = TASK;
}
 
/** Allocate & initialize call structure
 *
 * The call is initialized, so that the reply will be directed
 * to TASK->answerbox
 *
 * @param flags Parameters for slab_alloc (ATOMIC, etc.)
 */
call_t * ipc_call_alloc(int flags)
{
    call_t *call;
 
    call = slab_alloc(ipc_call_slab, flags);
    _ipc_call_init(call);
 
    return call;
}
 
/** Initialize allocated call */
void ipc_call_static_init(call_t *call)
{
    _ipc_call_init(call);
    call->flags |= IPC_CALL_STATIC_ALLOC;
}
 
/** Deallocate call stracuture */
void ipc_call_free(call_t *call)
{
    slab_free(ipc_call_slab, call);
}
 
/** Initialize answerbox structure
 */
void ipc_answerbox_init(answerbox_t *box)
{
    spinlock_initialize(&box->lock, "ipc_box_lock");
    spinlock_initialize(&box->irq_lock, "ipc_box_irqlock");
    waitq_initialize(&box->wq);
    list_initialize(&box->connected_phones);
    list_initialize(&box->calls);
    list_initialize(&box->dispatched_calls);
    list_initialize(&box->answers);
    list_initialize(&box->irq_notifs);
    box->task = TASK;
}
 
/** Connect phone to answerbox */
void ipc_phone_connect(phone_t *phone, answerbox_t *box)
{
    spinlock_lock(&phone->lock);
 
    phone->state = IPC_PHONE_CONNECTED;
    phone->callee = box;
 
    spinlock_lock(&box->lock);
    list_append(&phone->link, &box->connected_phones);
    spinlock_unlock(&box->lock);
 
    spinlock_unlock(&phone->lock);
}
 
/** Initialize phone structure and connect phone to answerbox
 */
void ipc_phone_init(phone_t *phone)
{
    spinlock_initialize(&phone->lock, "phone_lock");
    phone->callee = NULL;
    phone->state = IPC_PHONE_FREE;
    atomic_set(&phone->active_calls, 0);
}
 
/** Helper function to facilitate synchronous calls */
void ipc_call_sync(phone_t *phone, call_t *request)
{
    answerbox_t sync_box;
 
    ipc_answerbox_init(&sync_box);
 
    /* We will receive data on special box */
    request->callerbox = &sync_box;
 
    ipc_call(phone, request);
    ipc_wait_for_call(&sync_box, SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NONE);
}
 
/** Answer message that was not dispatched and is not entered in
 * any queue
 */
static void _ipc_answer_free_call(call_t *call)
{
    answerbox_t *callerbox = call->callerbox;
 
    call->flags |= IPC_CALL_ANSWERED;
 
    spinlock_lock(&callerbox->lock);
    list_append(&call->link, &callerbox->answers);
    spinlock_unlock(&callerbox->lock);
    waitq_wakeup(&callerbox->wq, 0);
}
 
/** Answer message, that is in callee queue
 *
 * @param box Answerbox that is answering the message
 * @param call Modified request that is being sent back
 */
void ipc_answer(answerbox_t *box, call_t *call)
{
    /* Remove from active box */
    spinlock_lock(&box->lock);
    list_remove(&call->link);
    spinlock_unlock(&box->lock);
    /* Send back answer */
    _ipc_answer_free_call(call);
}
 
/** Simulate sending back a message
 *
 * Most errors are better handled by forming a normal backward
 * message and sending it as a normal answer.
 */
void ipc_backsend_err(phone_t *phone, call_t *call, __native err)
{
    call->data.phone = phone;
    atomic_inc(&phone->active_calls);
    IPC_SET_RETVAL(call->data, err);
    _ipc_answer_free_call(call);
}
 
/* Unsafe unchecking ipc_call */
static void _ipc_call(phone_t *phone, answerbox_t *box, call_t *call)
{
    if (! (call->flags & IPC_CALL_FORWARDED)) {
        atomic_inc(&phone->active_calls);
        call->data.phone = phone;
    }
 
    spinlock_lock(&box->lock);
    list_append(&call->link, &box->calls);
    spinlock_unlock(&box->lock);
    waitq_wakeup(&box->wq, 0);
}
 
/** Send a asynchronous request using phone to answerbox
 *
 * @param phone Phone connected to answerbox
 * @param request Request to be sent
 */
int ipc_call(phone_t *phone, call_t *call)
{
    answerbox_t *box;
 
    spinlock_lock(&phone->lock);
    if (phone->state != IPC_PHONE_CONNECTED) {
        spinlock_unlock(&phone->lock);
        if (call->flags & IPC_CALL_FORWARDED) {
            IPC_SET_RETVAL(call->data, EFORWARD);
            _ipc_answer_free_call(call);
        } else {
            if (phone->state == IPC_PHONE_HUNGUP)
                ipc_backsend_err(phone, call, EHANGUP);
            else
                ipc_backsend_err(phone, call, ENOENT);
        }
        return ENOENT;
    }
    box = phone->callee;
    _ipc_call(phone, box, call);
   
    spinlock_unlock(&phone->lock);
    return 0;
}
 
/** Disconnect phone from answerbox
 *
 * This call leaves the phone in HUNGUP state. The change to 'free' is done
 * lazily later.
 *
 * @param phone Phone to be hung up
 *              
 * @return 0 - phone disconnected, -1 - the phone was already disconnected
 */
int ipc_phone_hangup(phone_t *phone)
{
    answerbox_t *box;
    call_t *call;
   
    spinlock_lock(&phone->lock);
    if (phone->state == IPC_PHONE_FREE || phone->state ==IPC_PHONE_HUNGUP \
        || phone->state == IPC_PHONE_CONNECTING) {
        spinlock_unlock(&phone->lock);
        return -1;
    }
    box = phone->callee;
    if (phone->state != IPC_PHONE_SLAMMED) {
        /* Remove myself from answerbox */
        spinlock_lock(&box->lock);
        list_remove(&phone->link);
        spinlock_unlock(&box->lock);
 
        if (phone->state != IPC_PHONE_SLAMMED) {
            call = ipc_call_alloc(0);
            IPC_SET_METHOD(call->data, IPC_M_PHONE_HUNGUP);
            call->flags |= IPC_CALL_DISCARD_ANSWER;
            _ipc_call(phone, box, call);
        }
    }
 
    phone->state = IPC_PHONE_HUNGUP;
    spinlock_unlock(&phone->lock);
 
    return 0;
}
 
/** Forwards call from one answerbox to a new one
 *
 * @param call Call to be redirected.
 * @param newphone Phone to target answerbox.
 * @param oldbox Old answerbox
 * @return 0 on forward ok, error code, if there was error
 *
 * - the return value serves only as an information for the forwarder,
 *   the original caller is notified automatically with EFORWARD
 */
int ipc_forward(call_t *call, phone_t *newphone, answerbox_t *oldbox)
{
    spinlock_lock(&oldbox->lock);
    list_remove(&call->link);
    spinlock_unlock(&oldbox->lock);
 
    return ipc_call(newphone, call);
}
 
 
/** Wait for phone call
 *
 * @param box Answerbox expecting the call.
 * @param usec Timeout in microseconds. See documentation for waitq_sleep_timeout() for
 *         decription of its special meaning.
 * @param flags Select mode of sleep operation. See documentation for waitq_sleep_timeout()i
 *      for description of its special meaning.
 * @return Recived message address
 * - to distinguish between call and answer, look at call->flags
 */
call_t * ipc_wait_for_call(answerbox_t *box, __u32 usec, int flags)
{
    call_t *request;
    ipl_t ipl;
    int rc;
 
restart:
    rc = waitq_sleep_timeout(&box->wq, usec, flags);
    if (SYNCH_FAILED(rc))
        return NULL;
   
    spinlock_lock(&box->lock);
    if (!list_empty(&box->irq_notifs)) {
        ipl = interrupts_disable();
        spinlock_lock(&box->irq_lock);
 
        request = list_get_instance(box->irq_notifs.next, call_t, link);
        list_remove(&request->link);
 
        spinlock_unlock(&box->irq_lock);
        interrupts_restore(ipl);
    } else if (!list_empty(&box->answers)) {
        /* Handle asynchronous answers */
        request = list_get_instance(box->answers.next, call_t, link);
        list_remove(&request->link);
        atomic_dec(&request->data.phone->active_calls);
    } else if (!list_empty(&box->calls)) {
        /* Handle requests */
        request = list_get_instance(box->calls.next, call_t, link);
        list_remove(&request->link);
        /* Append request to dispatch queue */
        list_append(&request->link, &box->dispatched_calls);
    } else {
        /* This can happen regularly after ipc_cleanup */
        spinlock_unlock(&box->lock);
        goto restart;
    }
    spinlock_unlock(&box->lock);
    return request;
}
 
/** Answer all calls from list with EHANGUP msg */
static void ipc_cleanup_call_list(link_t *lst)
{
    call_t *call;
 
    while (!list_empty(lst)) {
        call = list_get_instance(lst->next, call_t, link);
        list_remove(&call->link);
 
        IPC_SET_RETVAL(call->data, EHANGUP);
        _ipc_answer_free_call(call);
    }
}
 
/** Cleans up all IPC communication of the current task
 *
 * Note: ipc_hangup sets returning answerbox to TASK->answerbox, you
 * have to change it as well if you want to cleanup other current then current.
 */
void ipc_cleanup(void)
{
    int i;
    call_t *call;
    phone_t *phone;
 
    /* Disconnect all our phones ('ipc_phone_hangup') */
    for (i=0;i < IPC_MAX_PHONES; i++)
        ipc_phone_hangup(&TASK->phones[i]);
 
    /* Disconnect all connected irqs */
    ipc_irq_cleanup(&TASK->answerbox);
 
    /* Disconnect all phones connected to our answerbox */
restart_phones:
    spinlock_lock(&TASK->answerbox.lock);
    while (!list_empty(&TASK->answerbox.connected_phones)) {
        phone = list_get_instance(TASK->answerbox.connected_phones.next,
                      phone_t, link);
        if (! spinlock_trylock(&phone->lock)) {
            spinlock_unlock(&TASK->answerbox.lock);
            goto restart_phones;
        }
       
        /* Disconnect phone */
        ASSERT(phone->state == IPC_PHONE_CONNECTED);
        phone->state = IPC_PHONE_SLAMMED;
        list_remove(&phone->link);
 
        spinlock_unlock(&phone->lock);
    }
 
    /* Answer all messages in 'calls' and 'dispatched_calls' queues */
    ipc_cleanup_call_list(&TASK->answerbox.dispatched_calls);
    ipc_cleanup_call_list(&TASK->answerbox.calls);
    spinlock_unlock(&TASK->answerbox.lock);
   
    /* Wait for all async answers to arrive */
    while (1) {
        /* Go through all phones, until all are FREE... */
        /* Locking not needed, no one else should modify
         * it, when we are in cleanup */
        for (i=0;i < IPC_MAX_PHONES; i++) {
            if (TASK->phones[i].state == IPC_PHONE_HUNGUP && \
                atomic_get(&TASK->phones[i].active_calls) == 0)
                TASK->phones[i].state = IPC_PHONE_FREE;
           
            /* Just for sure, we might have had some
             * IPC_PHONE_CONNECTING phones */
            if (TASK->phones[i].state == IPC_PHONE_CONNECTED)
                ipc_phone_hangup(&TASK->phones[i]);
            /* If the hangup succeeded, it has sent a HANGUP
             * message, the IPC is now in HUNGUP state, we
             * wait for the reply to come */
           
            if (TASK->phones[i].state != IPC_PHONE_FREE)
                break;
        }
        /* Voila, got into cleanup */
        if (i == IPC_MAX_PHONES)
            break;
       
        call = ipc_wait_for_call(&TASK->answerbox, SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NONE);
        ASSERT((call->flags & IPC_CALL_ANSWERED) || (call->flags & IPC_CALL_NOTIF));
        ASSERT(! (call->flags & IPC_CALL_STATIC_ALLOC));
       
        atomic_dec(&TASK->active_calls);
        ipc_call_free(call);
    }
}
 
 
/** Initilize ipc subsystem */
void ipc_init(void)
{
    ipc_call_slab = slab_cache_create("ipc_call",
                      sizeof(call_t),
                      0,
                      NULL, NULL, 0);
    ipc_irq_make_table(IRQ_COUNT);
}
 
 
/** Kconsole - list answerbox contents */
void ipc_print_task(task_id_t taskid)
{
    task_t *task;
    int i;
    call_t *call;
    link_t *tmp;
   
    spinlock_lock(&tasks_lock);
    task = task_find_by_id(taskid);
    if (task)
        spinlock_lock(&task->lock);
    spinlock_unlock(&tasks_lock);
    if (!task)
        return;
 
    /* Print opened phones & details */
    printf("PHONE:\n");
    for (i=0; i < IPC_MAX_PHONES;i++) {
        spinlock_lock(&task->phones[i].lock);
        if (task->phones[i].state != IPC_PHONE_FREE) {
            printf("%d: ",i);
            switch (task->phones[i].state) {
            case IPC_PHONE_CONNECTING:
                printf("connecting ");
                break;
            case IPC_PHONE_CONNECTED:
                printf("connected to: %P ",
                       task->phones[i].callee);
                break;
            case IPC_PHONE_SLAMMED:
                printf("slammed by: %P ",
                       task->phones[i].callee);
                break;
            case IPC_PHONE_HUNGUP:
                printf("hung up - was: %P ",
                       task->phones[i].callee);
                break;
            default:
                break;
            }
            printf("active: %d\n", atomic_get(&task->phones[i].active_calls));
        }
        spinlock_unlock(&task->phones[i].lock);
    }
 
 
    /* Print answerbox - calls */
    spinlock_lock(&task->answerbox.lock);
    printf("ABOX - CALLS:\n");
    for (tmp=task->answerbox.calls.next; tmp != &task->answerbox.calls;tmp = tmp->next) {
        call = list_get_instance(tmp, call_t, link);
        printf("Callid: %P Srctask:%lld M:%d A1:%d A2:%d A3:%d Flags:%x\n",call,
               call->sender->taskid, IPC_GET_METHOD(call->data), IPC_GET_ARG1(call->data),
               IPC_GET_ARG2(call->data), IPC_GET_ARG3(call->data), call->flags);
    }
    /* Print answerbox - calls */
    printf("ABOX - DISPATCHED CALLS:\n");
    for (tmp=task->answerbox.dispatched_calls.next;
         tmp != &task->answerbox.dispatched_calls;
         tmp = tmp->next) {
        call = list_get_instance(tmp, call_t, link);
        printf("Callid: %P Srctask:%lld M:%d A1:%d A2:%d A3:%d Flags:%x\n",call,
               call->sender->taskid, IPC_GET_METHOD(call->data), IPC_GET_ARG1(call->data),
               IPC_GET_ARG2(call->data), IPC_GET_ARG3(call->data), call->flags);
    }
    /* Print answerbox - calls */
    printf("ABOX - ANSWERS:\n");
    for (tmp=task->answerbox.answers.next; tmp != &task->answerbox.answers; tmp = tmp->next) {
        call = list_get_instance(tmp, call_t, link);
        printf("Callid:%P M:%d A1:%d A2:%d A3:%d Flags:%x\n",call,
               IPC_GET_METHOD(call->data), IPC_GET_ARG1(call->data),
               IPC_GET_ARG2(call->data), IPC_GET_ARG3(call->data), call->flags);
    }
 
    spinlock_unlock(&task->answerbox.lock);
    spinlock_unlock(&task->lock);
}
 
 /** @}
 */
 
 

Rev 1595	Rev 1702
1	/*	1	/*
2	* Copyright (C) 2006 Ondrej Palkovsky	2	* Copyright (C) 2006 Ondrej Palkovsky
3	* All rights reserved.	3	* All rights reserved.
4	*	4	*
5	* Redistribution and use in source and binary forms, with or without	5	* Redistribution and use in source and binary forms, with or without
6	* modification, are permitted provided that the following conditions	6	* modification, are permitted provided that the following conditions
7	* are met:	7	* are met:
8	*	8	*
9	* - Redistributions of source code must retain the above copyright	9	* - Redistributions of source code must retain the above copyright
10	* notice, this list of conditions and the following disclaimer.	10	* notice, this list of conditions and the following disclaimer.
11	* - Redistributions in binary form must reproduce the above copyright	11	* - Redistributions in binary form must reproduce the above copyright
12	* notice, this list of conditions and the following disclaimer in the	12	* notice, this list of conditions and the following disclaimer in the
13	* documentation and/or other materials provided with the distribution.	13	* documentation and/or other materials provided with the distribution.
14	* - The name of the author may not be used to endorse or promote products	14	* - The name of the author may not be used to endorse or promote products
15	* derived from this software without specific prior written permission.	15	* derived from this software without specific prior written permission.
16	*	16	*
17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES	18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY	23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF	25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.	26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27	*/	27	*/
28		28
-		29	/** @addtogroup genericipc IPC
-		30	* @ingroup kernel
-		31	* @brief Interprocess communication protocol
-		32	* @{
-		33	*/
-		34	/** @file
-		35	*/
-		36
29	/* Lock ordering	37	/* Lock ordering
30	*	38	*
31	* First the answerbox, then the phone	39	* First the answerbox, then the phone
32	*/	40	*/
33		41
34	#include <synch/spinlock.h>	42	#include <synch/spinlock.h>
35	#include <synch/waitq.h>	43	#include <synch/waitq.h>
36	#include <synch/synch.h>	44	#include <synch/synch.h>
37	#include <ipc/ipc.h>	45	#include <ipc/ipc.h>
38	#include <errno.h>	46	#include <errno.h>
39	#include <mm/slab.h>	47	#include <mm/slab.h>
40	#include <arch.h>	48	#include <arch.h>
41	#include <proc/task.h>	49	#include <proc/task.h>
42	#include <memstr.h>	50	#include <memstr.h>
43	#include <debug.h>	51	#include <debug.h>
44		52
45	#include <print.h>	53	#include <print.h>
46	#include <proc/thread.h>	54	#include <proc/thread.h>
47	#include <arch/interrupt.h>	55	#include <arch/interrupt.h>
48	#include <ipc/irq.h>	56	#include <ipc/irq.h>
49		57
50	/* Open channel that is assigned automatically to new tasks */	58	/* Open channel that is assigned automatically to new tasks */
51	answerbox_t *ipc_phone_0 = NULL;	59	answerbox_t *ipc_phone_0 = NULL;
52		60
53	static slab_cache_t *ipc_call_slab;	61	static slab_cache_t *ipc_call_slab;
54		62
55	/* Initialize new call */	63	/* Initialize new call */
56	static void _ipc_call_init(call_t *call)	64	static void _ipc_call_init(call_t *call)
57	{	65	{
58	memsetb((__address)call, sizeof(*call), 0);	66	memsetb((__address)call, sizeof(*call), 0);
59	call->callerbox = &TASK->answerbox;	67	call->callerbox = &TASK->answerbox;
60	call->sender = TASK;	68	call->sender = TASK;
61	}	69	}
62		70
63	/** Allocate & initialize call structure	71	/** Allocate & initialize call structure
64	*	72	*
65	* The call is initialized, so that the reply will be directed	73	* The call is initialized, so that the reply will be directed
66	* to TASK->answerbox	74	* to TASK->answerbox
67	*	75	*
68	* @param flags Parameters for slab_alloc (ATOMIC, etc.)	76	* @param flags Parameters for slab_alloc (ATOMIC, etc.)
69	*/	77	*/
70	call_t * ipc_call_alloc(int flags)	78	call_t * ipc_call_alloc(int flags)
71	{	79	{
72	call_t *call;	80	call_t *call;
73		81
74	call = slab_alloc(ipc_call_slab, flags);	82	call = slab_alloc(ipc_call_slab, flags);
75	_ipc_call_init(call);	83	_ipc_call_init(call);
76		84
77	return call;	85	return call;
78	}	86	}
79		87
80	/** Initialize allocated call */	88	/** Initialize allocated call */
81	void ipc_call_static_init(call_t *call)	89	void ipc_call_static_init(call_t *call)
82	{	90	{
83	_ipc_call_init(call);	91	_ipc_call_init(call);
84	call->flags \|= IPC_CALL_STATIC_ALLOC;	92	call->flags \|= IPC_CALL_STATIC_ALLOC;
85	}	93	}
86		94
87	/** Deallocate call stracuture */	95	/** Deallocate call stracuture */
88	void ipc_call_free(call_t *call)	96	void ipc_call_free(call_t *call)
89	{	97	{
90	slab_free(ipc_call_slab, call);	98	slab_free(ipc_call_slab, call);
91	}	99	}
92		100
93	/** Initialize answerbox structure	101	/** Initialize answerbox structure
94	*/	102	*/
95	void ipc_answerbox_init(answerbox_t *box)	103	void ipc_answerbox_init(answerbox_t *box)
96	{	104	{
97	spinlock_initialize(&box->lock, "ipc_box_lock");	105	spinlock_initialize(&box->lock, "ipc_box_lock");
98	spinlock_initialize(&box->irq_lock, "ipc_box_irqlock");	106	spinlock_initialize(&box->irq_lock, "ipc_box_irqlock");
99	waitq_initialize(&box->wq);	107	waitq_initialize(&box->wq);
100	list_initialize(&box->connected_phones);	108	list_initialize(&box->connected_phones);
101	list_initialize(&box->calls);	109	list_initialize(&box->calls);
102	list_initialize(&box->dispatched_calls);	110	list_initialize(&box->dispatched_calls);
103	list_initialize(&box->answers);	111	list_initialize(&box->answers);
104	list_initialize(&box->irq_notifs);	112	list_initialize(&box->irq_notifs);
105	box->task = TASK;	113	box->task = TASK;
106	}	114	}
107		115
108	/** Connect phone to answerbox */	116	/** Connect phone to answerbox */
109	void ipc_phone_connect(phone_t phone, answerbox_t box)	117	void ipc_phone_connect(phone_t phone, answerbox_t box)
110	{	118	{
111	spinlock_lock(&phone->lock);	119	spinlock_lock(&phone->lock);
112		120
113	phone->state = IPC_PHONE_CONNECTED;	121	phone->state = IPC_PHONE_CONNECTED;
114	phone->callee = box;	122	phone->callee = box;
115		123
116	spinlock_lock(&box->lock);	124	spinlock_lock(&box->lock);
117	list_append(&phone->link, &box->connected_phones);	125	list_append(&phone->link, &box->connected_phones);
118	spinlock_unlock(&box->lock);	126	spinlock_unlock(&box->lock);
119		127
120	spinlock_unlock(&phone->lock);	128	spinlock_unlock(&phone->lock);
121	}	129	}
122		130
123	/** Initialize phone structure and connect phone to answerbox	131	/** Initialize phone structure and connect phone to answerbox
124	*/	132	*/
125	void ipc_phone_init(phone_t *phone)	133	void ipc_phone_init(phone_t *phone)
126	{	134	{
127	spinlock_initialize(&phone->lock, "phone_lock");	135	spinlock_initialize(&phone->lock, "phone_lock");
128	phone->callee = NULL;	136	phone->callee = NULL;
129	phone->state = IPC_PHONE_FREE;	137	phone->state = IPC_PHONE_FREE;
130	atomic_set(&phone->active_calls, 0);	138	atomic_set(&phone->active_calls, 0);
131	}	139	}
132		140
133	/** Helper function to facilitate synchronous calls */	141	/** Helper function to facilitate synchronous calls */
134	void ipc_call_sync(phone_t phone, call_t request)	142	void ipc_call_sync(phone_t phone, call_t request)
135	{	143	{
136	answerbox_t sync_box;	144	answerbox_t sync_box;
137		145
138	ipc_answerbox_init(&sync_box);	146	ipc_answerbox_init(&sync_box);
139		147
140	/* We will receive data on special box */	148	/* We will receive data on special box */
141	request->callerbox = &sync_box;	149	request->callerbox = &sync_box;
142		150
143	ipc_call(phone, request);	151	ipc_call(phone, request);
144	ipc_wait_for_call(&sync_box, SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NONE);	152	ipc_wait_for_call(&sync_box, SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NONE);
145	}	153	}
146		154
147	/** Answer message that was not dispatched and is not entered in	155	/** Answer message that was not dispatched and is not entered in
148	* any queue	156	* any queue
149	*/	157	*/
150	static void _ipc_answer_free_call(call_t *call)	158	static void _ipc_answer_free_call(call_t *call)
151	{	159	{
152	answerbox_t *callerbox = call->callerbox;	160	answerbox_t *callerbox = call->callerbox;
153		161
154	call->flags \|= IPC_CALL_ANSWERED;	162	call->flags \|= IPC_CALL_ANSWERED;
155		163
156	spinlock_lock(&callerbox->lock);	164	spinlock_lock(&callerbox->lock);
157	list_append(&call->link, &callerbox->answers);	165	list_append(&call->link, &callerbox->answers);
158	spinlock_unlock(&callerbox->lock);	166	spinlock_unlock(&callerbox->lock);
159	waitq_wakeup(&callerbox->wq, 0);	167	waitq_wakeup(&callerbox->wq, 0);
160	}	168	}
161		169
162	/** Answer message, that is in callee queue	170	/** Answer message, that is in callee queue
163	*	171	*
164	* @param box Answerbox that is answering the message	172	* @param box Answerbox that is answering the message
165	* @param call Modified request that is being sent back	173	* @param call Modified request that is being sent back
166	*/	174	*/
167	void ipc_answer(answerbox_t box, call_t call)	175	void ipc_answer(answerbox_t box, call_t call)
168	{	176	{
169	/* Remove from active box */	177	/* Remove from active box */
170	spinlock_lock(&box->lock);	178	spinlock_lock(&box->lock);
171	list_remove(&call->link);	179	list_remove(&call->link);
172	spinlock_unlock(&box->lock);	180	spinlock_unlock(&box->lock);
173	/* Send back answer */	181	/* Send back answer */
174	_ipc_answer_free_call(call);	182	_ipc_answer_free_call(call);
175	}	183	}
176		184
177	/** Simulate sending back a message	185	/** Simulate sending back a message
178	*	186	*
179	* Most errors are better handled by forming a normal backward	187	* Most errors are better handled by forming a normal backward
180	* message and sending it as a normal answer.	188	* message and sending it as a normal answer.
181	*/	189	*/
182	void ipc_backsend_err(phone_t phone, call_t call, __native err)	190	void ipc_backsend_err(phone_t phone, call_t call, __native err)
183	{	191	{
184	call->data.phone = phone;	192	call->data.phone = phone;
185	atomic_inc(&phone->active_calls);	193	atomic_inc(&phone->active_calls);
186	IPC_SET_RETVAL(call->data, err);	194	IPC_SET_RETVAL(call->data, err);
187	_ipc_answer_free_call(call);	195	_ipc_answer_free_call(call);
188	}	196	}
189		197
190	/* Unsafe unchecking ipc_call */	198	/* Unsafe unchecking ipc_call */
191	static void _ipc_call(phone_t phone, answerbox_t box, call_t *call)	199	static void _ipc_call(phone_t phone, answerbox_t box, call_t *call)
192	{	200	{
193	if (! (call->flags & IPC_CALL_FORWARDED)) {	201	if (! (call->flags & IPC_CALL_FORWARDED)) {
194	atomic_inc(&phone->active_calls);	202	atomic_inc(&phone->active_calls);
195	call->data.phone = phone;	203	call->data.phone = phone;
196	}	204	}
197		205
198	spinlock_lock(&box->lock);	206	spinlock_lock(&box->lock);
199	list_append(&call->link, &box->calls);	207	list_append(&call->link, &box->calls);
200	spinlock_unlock(&box->lock);	208	spinlock_unlock(&box->lock);
201	waitq_wakeup(&box->wq, 0);	209	waitq_wakeup(&box->wq, 0);
202	}	210	}
203		211
204	/** Send a asynchronous request using phone to answerbox	212	/** Send a asynchronous request using phone to answerbox
205	*	213	*
206	* @param phone Phone connected to answerbox	214	* @param phone Phone connected to answerbox
207	* @param request Request to be sent	215	* @param request Request to be sent
208	*/	216	*/
209	int ipc_call(phone_t phone, call_t call)	217	int ipc_call(phone_t phone, call_t call)
210	{	218	{
211	answerbox_t *box;	219	answerbox_t *box;
212		220
213	spinlock_lock(&phone->lock);	221	spinlock_lock(&phone->lock);
214	if (phone->state != IPC_PHONE_CONNECTED) {	222	if (phone->state != IPC_PHONE_CONNECTED) {
215	spinlock_unlock(&phone->lock);	223	spinlock_unlock(&phone->lock);
216	if (call->flags & IPC_CALL_FORWARDED) {	224	if (call->flags & IPC_CALL_FORWARDED) {
217	IPC_SET_RETVAL(call->data, EFORWARD);	225	IPC_SET_RETVAL(call->data, EFORWARD);
218	_ipc_answer_free_call(call);	226	_ipc_answer_free_call(call);
219	} else {	227	} else {
220	if (phone->state == IPC_PHONE_HUNGUP)	228	if (phone->state == IPC_PHONE_HUNGUP)
221	ipc_backsend_err(phone, call, EHANGUP);	229	ipc_backsend_err(phone, call, EHANGUP);
222	else	230	else
223	ipc_backsend_err(phone, call, ENOENT);	231	ipc_backsend_err(phone, call, ENOENT);
224	}	232	}
225	return ENOENT;	233	return ENOENT;
226	}	234	}
227	box = phone->callee;	235	box = phone->callee;
228	_ipc_call(phone, box, call);	236	_ipc_call(phone, box, call);
229		237
230	spinlock_unlock(&phone->lock);	238	spinlock_unlock(&phone->lock);
231	return 0;	239	return 0;
232	}	240	}
233		241
234	/** Disconnect phone from answerbox	242	/** Disconnect phone from answerbox
235	*	243	*
236	* This call leaves the phone in HUNGUP state. The change to 'free' is done	244	* This call leaves the phone in HUNGUP state. The change to 'free' is done
237	* lazily later.	245	* lazily later.
238	*	246	*
239	* @param phone Phone to be hung up	247	* @param phone Phone to be hung up
240	*	248	*
241	* @return 0 - phone disconnected, -1 - the phone was already disconnected	249	* @return 0 - phone disconnected, -1 - the phone was already disconnected
242	*/	250	*/
243	int ipc_phone_hangup(phone_t *phone)	251	int ipc_phone_hangup(phone_t *phone)
244	{	252	{
245	answerbox_t *box;	253	answerbox_t *box;
246	call_t *call;	254	call_t *call;
247		255
248	spinlock_lock(&phone->lock);	256	spinlock_lock(&phone->lock);
249	if (phone->state == IPC_PHONE_FREE \|\| phone->state ==IPC_PHONE_HUNGUP \	257	if (phone->state == IPC_PHONE_FREE \|\| phone->state ==IPC_PHONE_HUNGUP \
250	\|\| phone->state == IPC_PHONE_CONNECTING) {	258	\|\| phone->state == IPC_PHONE_CONNECTING) {
251	spinlock_unlock(&phone->lock);	259	spinlock_unlock(&phone->lock);
252	return -1;	260	return -1;
253	}	261	}
254	box = phone->callee;	262	box = phone->callee;
255	if (phone->state != IPC_PHONE_SLAMMED) {	263	if (phone->state != IPC_PHONE_SLAMMED) {
256	/* Remove myself from answerbox */	264	/* Remove myself from answerbox */
257	spinlock_lock(&box->lock);	265	spinlock_lock(&box->lock);
258	list_remove(&phone->link);	266	list_remove(&phone->link);
259	spinlock_unlock(&box->lock);	267	spinlock_unlock(&box->lock);
260		268
261	if (phone->state != IPC_PHONE_SLAMMED) {	269	if (phone->state != IPC_PHONE_SLAMMED) {
262	call = ipc_call_alloc(0);	270	call = ipc_call_alloc(0);
263	IPC_SET_METHOD(call->data, IPC_M_PHONE_HUNGUP);	271	IPC_SET_METHOD(call->data, IPC_M_PHONE_HUNGUP);
264	call->flags \|= IPC_CALL_DISCARD_ANSWER;	272	call->flags \|= IPC_CALL_DISCARD_ANSWER;
265	_ipc_call(phone, box, call);	273	_ipc_call(phone, box, call);
266	}	274	}
267	}	275	}
268		276
269	phone->state = IPC_PHONE_HUNGUP;	277	phone->state = IPC_PHONE_HUNGUP;
270	spinlock_unlock(&phone->lock);	278	spinlock_unlock(&phone->lock);
271		279
272	return 0;	280	return 0;
273	}	281	}
274		282
275	/** Forwards call from one answerbox to a new one	283	/** Forwards call from one answerbox to a new one
276	*	284	*
277	* @param call Call to be redirected.	285	* @param call Call to be redirected.
278	* @param newphone Phone to target answerbox.	286	* @param newphone Phone to target answerbox.
279	* @param oldbox Old answerbox	287	* @param oldbox Old answerbox
280	* @return 0 on forward ok, error code, if there was error	288	* @return 0 on forward ok, error code, if there was error
281	*	289	*
282	* - the return value serves only as an information for the forwarder,	290	* - the return value serves only as an information for the forwarder,
283	* the original caller is notified automatically with EFORWARD	291	* the original caller is notified automatically with EFORWARD
284	*/	292	*/
285	int ipc_forward(call_t call, phone_t newphone, answerbox_t *oldbox)	293	int ipc_forward(call_t call, phone_t newphone, answerbox_t *oldbox)
286	{	294	{
287	spinlock_lock(&oldbox->lock);	295	spinlock_lock(&oldbox->lock);
288	list_remove(&call->link);	296	list_remove(&call->link);
289	spinlock_unlock(&oldbox->lock);	297	spinlock_unlock(&oldbox->lock);
290		298
291	return ipc_call(newphone, call);	299	return ipc_call(newphone, call);
292	}	300	}
293		301
294		302
295	/** Wait for phone call	303	/** Wait for phone call
296	*	304	*
297	* @param box Answerbox expecting the call.	305	* @param box Answerbox expecting the call.
298	* @param usec Timeout in microseconds. See documentation for waitq_sleep_timeout() for	306	* @param usec Timeout in microseconds. See documentation for waitq_sleep_timeout() for
299	* decription of its special meaning.	307	* decription of its special meaning.
300	* @param flags Select mode of sleep operation. See documentation for waitq_sleep_timeout()i	308	* @param flags Select mode of sleep operation. See documentation for waitq_sleep_timeout()i
301	* for description of its special meaning.	309	* for description of its special meaning.
302	* @return Recived message address	310	* @return Recived message address
303	* - to distinguish between call and answer, look at call->flags	311	* - to distinguish between call and answer, look at call->flags
304	*/	312	*/
305	call_t * ipc_wait_for_call(answerbox_t *box, __u32 usec, int flags)	313	call_t * ipc_wait_for_call(answerbox_t *box, __u32 usec, int flags)
306	{	314	{
307	call_t *request;	315	call_t *request;
308	ipl_t ipl;	316	ipl_t ipl;
309	int rc;	317	int rc;
310		318
311	restart:	319	restart:
312	rc = waitq_sleep_timeout(&box->wq, usec, flags);	320	rc = waitq_sleep_timeout(&box->wq, usec, flags);
313	if (SYNCH_FAILED(rc))	321	if (SYNCH_FAILED(rc))
314	return NULL;	322	return NULL;
315		323
316	spinlock_lock(&box->lock);	324	spinlock_lock(&box->lock);
317	if (!list_empty(&box->irq_notifs)) {	325	if (!list_empty(&box->irq_notifs)) {
318	ipl = interrupts_disable();	326	ipl = interrupts_disable();
319	spinlock_lock(&box->irq_lock);	327	spinlock_lock(&box->irq_lock);
320		328
321	request = list_get_instance(box->irq_notifs.next, call_t, link);	329	request = list_get_instance(box->irq_notifs.next, call_t, link);
322	list_remove(&request->link);	330	list_remove(&request->link);
323		331
324	spinlock_unlock(&box->irq_lock);	332	spinlock_unlock(&box->irq_lock);
325	interrupts_restore(ipl);	333	interrupts_restore(ipl);
326	} else if (!list_empty(&box->answers)) {	334	} else if (!list_empty(&box->answers)) {
327	/* Handle asynchronous answers */	335	/* Handle asynchronous answers */
328	request = list_get_instance(box->answers.next, call_t, link);	336	request = list_get_instance(box->answers.next, call_t, link);
329	list_remove(&request->link);	337	list_remove(&request->link);
330	atomic_dec(&request->data.phone->active_calls);	338	atomic_dec(&request->data.phone->active_calls);
331	} else if (!list_empty(&box->calls)) {	339	} else if (!list_empty(&box->calls)) {
332	/* Handle requests */	340	/* Handle requests */
333	request = list_get_instance(box->calls.next, call_t, link);	341	request = list_get_instance(box->calls.next, call_t, link);
334	list_remove(&request->link);	342	list_remove(&request->link);
335	/* Append request to dispatch queue */	343	/* Append request to dispatch queue */
336	list_append(&request->link, &box->dispatched_calls);	344	list_append(&request->link, &box->dispatched_calls);
337	} else {	345	} else {
338	/* This can happen regularly after ipc_cleanup */	346	/* This can happen regularly after ipc_cleanup */
339	spinlock_unlock(&box->lock);	347	spinlock_unlock(&box->lock);
340	goto restart;	348	goto restart;
341	}	349	}
342	spinlock_unlock(&box->lock);	350	spinlock_unlock(&box->lock);
343	return request;	351	return request;
344	}	352	}
345		353
346	/** Answer all calls from list with EHANGUP msg */	354	/** Answer all calls from list with EHANGUP msg */
347	static void ipc_cleanup_call_list(link_t *lst)	355	static void ipc_cleanup_call_list(link_t *lst)
348	{	356	{
349	call_t *call;	357	call_t *call;
350		358
351	while (!list_empty(lst)) {	359	while (!list_empty(lst)) {
352	call = list_get_instance(lst->next, call_t, link);	360	call = list_get_instance(lst->next, call_t, link);
353	list_remove(&call->link);	361	list_remove(&call->link);
354		362
355	IPC_SET_RETVAL(call->data, EHANGUP);	363	IPC_SET_RETVAL(call->data, EHANGUP);
356	_ipc_answer_free_call(call);	364	_ipc_answer_free_call(call);
357	}	365	}
358	}	366	}
359		367
360	/** Cleans up all IPC communication of the current task	368	/** Cleans up all IPC communication of the current task
361	*	369	*
362	* Note: ipc_hangup sets returning answerbox to TASK->answerbox, you	370	* Note: ipc_hangup sets returning answerbox to TASK->answerbox, you
363	* have to change it as well if you want to cleanup other current then current.	371	* have to change it as well if you want to cleanup other current then current.
364	*/	372	*/
365	void ipc_cleanup(void)	373	void ipc_cleanup(void)
366	{	374	{
367	int i;	375	int i;
368	call_t *call;	376	call_t *call;
369	phone_t *phone;	377	phone_t *phone;
370		378
371	/* Disconnect all our phones ('ipc_phone_hangup') */	379	/* Disconnect all our phones ('ipc_phone_hangup') */
372	for (i=0;i < IPC_MAX_PHONES; i++)	380	for (i=0;i < IPC_MAX_PHONES; i++)
373	ipc_phone_hangup(&TASK->phones[i]);	381	ipc_phone_hangup(&TASK->phones[i]);
374		382
375	/* Disconnect all connected irqs */	383	/* Disconnect all connected irqs */
376	ipc_irq_cleanup(&TASK->answerbox);	384	ipc_irq_cleanup(&TASK->answerbox);
377		385
378	/* Disconnect all phones connected to our answerbox */	386	/* Disconnect all phones connected to our answerbox */
379	restart_phones:	387	restart_phones:
380	spinlock_lock(&TASK->answerbox.lock);	388	spinlock_lock(&TASK->answerbox.lock);
381	while (!list_empty(&TASK->answerbox.connected_phones)) {	389	while (!list_empty(&TASK->answerbox.connected_phones)) {
382	phone = list_get_instance(TASK->answerbox.connected_phones.next,	390	phone = list_get_instance(TASK->answerbox.connected_phones.next,
383	phone_t, link);	391	phone_t, link);
384	if (! spinlock_trylock(&phone->lock)) {	392	if (! spinlock_trylock(&phone->lock)) {
385	spinlock_unlock(&TASK->answerbox.lock);	393	spinlock_unlock(&TASK->answerbox.lock);
386	goto restart_phones;	394	goto restart_phones;
387	}	395	}
388		396
389	/* Disconnect phone */	397	/* Disconnect phone */
390	ASSERT(phone->state == IPC_PHONE_CONNECTED);	398	ASSERT(phone->state == IPC_PHONE_CONNECTED);
391	phone->state = IPC_PHONE_SLAMMED;	399	phone->state = IPC_PHONE_SLAMMED;
392	list_remove(&phone->link);	400	list_remove(&phone->link);
393		401
394	spinlock_unlock(&phone->lock);	402	spinlock_unlock(&phone->lock);
395	}	403	}
396		404
397	/* Answer all messages in 'calls' and 'dispatched_calls' queues */	405	/* Answer all messages in 'calls' and 'dispatched_calls' queues */
398	ipc_cleanup_call_list(&TASK->answerbox.dispatched_calls);	406	ipc_cleanup_call_list(&TASK->answerbox.dispatched_calls);
399	ipc_cleanup_call_list(&TASK->answerbox.calls);	407	ipc_cleanup_call_list(&TASK->answerbox.calls);
400	spinlock_unlock(&TASK->answerbox.lock);	408	spinlock_unlock(&TASK->answerbox.lock);
401		409
402	/* Wait for all async answers to arrive */	410	/* Wait for all async answers to arrive */
403	while (1) {	411	while (1) {
404	/* Go through all phones, until all are FREE... */	412	/* Go through all phones, until all are FREE... */
405	/* Locking not needed, no one else should modify	413	/* Locking not needed, no one else should modify
406	* it, when we are in cleanup */	414	* it, when we are in cleanup */
407	for (i=0;i < IPC_MAX_PHONES; i++) {	415	for (i=0;i < IPC_MAX_PHONES; i++) {
408	if (TASK->phones[i].state == IPC_PHONE_HUNGUP && \	416	if (TASK->phones[i].state == IPC_PHONE_HUNGUP && \
409	atomic_get(&TASK->phones[i].active_calls) == 0)	417	atomic_get(&TASK->phones[i].active_calls) == 0)
410	TASK->phones[i].state = IPC_PHONE_FREE;	418	TASK->phones[i].state = IPC_PHONE_FREE;
411		419
412	/* Just for sure, we might have had some	420	/* Just for sure, we might have had some
413	* IPC_PHONE_CONNECTING phones */	421	* IPC_PHONE_CONNECTING phones */
414	if (TASK->phones[i].state == IPC_PHONE_CONNECTED)	422	if (TASK->phones[i].state == IPC_PHONE_CONNECTED)
415	ipc_phone_hangup(&TASK->phones[i]);	423	ipc_phone_hangup(&TASK->phones[i]);
416	/* If the hangup succeeded, it has sent a HANGUP	424	/* If the hangup succeeded, it has sent a HANGUP
417	* message, the IPC is now in HUNGUP state, we	425	* message, the IPC is now in HUNGUP state, we
418	* wait for the reply to come */	426	* wait for the reply to come */
419		427
420	if (TASK->phones[i].state != IPC_PHONE_FREE)	428	if (TASK->phones[i].state != IPC_PHONE_FREE)
421	break;	429	break;
422	}	430	}
423	/* Voila, got into cleanup */	431	/* Voila, got into cleanup */
424	if (i == IPC_MAX_PHONES)	432	if (i == IPC_MAX_PHONES)
425	break;	433	break;
426		434
427	call = ipc_wait_for_call(&TASK->answerbox, SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NONE);	435	call = ipc_wait_for_call(&TASK->answerbox, SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NONE);
428	ASSERT((call->flags & IPC_CALL_ANSWERED) \|\| (call->flags & IPC_CALL_NOTIF));	436	ASSERT((call->flags & IPC_CALL_ANSWERED) \|\| (call->flags & IPC_CALL_NOTIF));
429	ASSERT(! (call->flags & IPC_CALL_STATIC_ALLOC));	437	ASSERT(! (call->flags & IPC_CALL_STATIC_ALLOC));
430		438
431	atomic_dec(&TASK->active_calls);	439	atomic_dec(&TASK->active_calls);
432	ipc_call_free(call);	440	ipc_call_free(call);
433	}	441	}
434	}	442	}
435		443
436		444
437	/** Initilize ipc subsystem */	445	/** Initilize ipc subsystem */
438	void ipc_init(void)	446	void ipc_init(void)
439	{	447	{
440	ipc_call_slab = slab_cache_create("ipc_call",	448	ipc_call_slab = slab_cache_create("ipc_call",
441	sizeof(call_t),	449	sizeof(call_t),
442	0,	450	0,
443	NULL, NULL, 0);	451	NULL, NULL, 0);
444	ipc_irq_make_table(IRQ_COUNT);	452	ipc_irq_make_table(IRQ_COUNT);
445	}	453	}
446		454
447		455
448	/** Kconsole - list answerbox contents */	456	/** Kconsole - list answerbox contents */
449	void ipc_print_task(task_id_t taskid)	457	void ipc_print_task(task_id_t taskid)
450	{	458	{
451	task_t *task;	459	task_t *task;
452	int i;	460	int i;
453	call_t *call;	461	call_t *call;
454	link_t *tmp;	462	link_t *tmp;
455		463
456	spinlock_lock(&tasks_lock);	464	spinlock_lock(&tasks_lock);
457	task = task_find_by_id(taskid);	465	task = task_find_by_id(taskid);
458	if (task)	466	if (task)
459	spinlock_lock(&task->lock);	467	spinlock_lock(&task->lock);
460	spinlock_unlock(&tasks_lock);	468	spinlock_unlock(&tasks_lock);
461	if (!task)	469	if (!task)
462	return;	470	return;
463		471
464	/* Print opened phones & details */	472	/* Print opened phones & details */
465	printf("PHONE:\n");	473	printf("PHONE:\n");
466	for (i=0; i < IPC_MAX_PHONES;i++) {	474	for (i=0; i < IPC_MAX_PHONES;i++) {
467	spinlock_lock(&task->phones[i].lock);	475	spinlock_lock(&task->phones[i].lock);
468	if (task->phones[i].state != IPC_PHONE_FREE) {	476	if (task->phones[i].state != IPC_PHONE_FREE) {
469	printf("%d: ",i);	477	printf("%d: ",i);
470	switch (task->phones[i].state) {	478	switch (task->phones[i].state) {
471	case IPC_PHONE_CONNECTING:	479	case IPC_PHONE_CONNECTING:
472	printf("connecting ");	480	printf("connecting ");
473	break;	481	break;
474	case IPC_PHONE_CONNECTED:	482	case IPC_PHONE_CONNECTED:
475	printf("connected to: %P ",	483	printf("connected to: %P ",
476	task->phones[i].callee);	484	task->phones[i].callee);
477	break;	485	break;
478	case IPC_PHONE_SLAMMED:	486	case IPC_PHONE_SLAMMED:
479	printf("slammed by: %P ",	487	printf("slammed by: %P ",
480	task->phones[i].callee);	488	task->phones[i].callee);
481	break;	489	break;
482	case IPC_PHONE_HUNGUP:	490	case IPC_PHONE_HUNGUP:
483	printf("hung up - was: %P ",	491	printf("hung up - was: %P ",
484	task->phones[i].callee);	492	task->phones[i].callee);
485	break;	493	break;
486	default:	494	default:
487	break;	495	break;
488	}	496	}
489	printf("active: %d\n", atomic_get(&task->phones[i].active_calls));	497	printf("active: %d\n", atomic_get(&task->phones[i].active_calls));
490	}	498	}
491	spinlock_unlock(&task->phones[i].lock);	499	spinlock_unlock(&task->phones[i].lock);
492	}	500	}

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/generic/src/ipc/ipc.c – Rev 1595 → 1702