WebSVN – HelenOS-historic – Diff – /kernel/trunk/generic/src/ipc/sysipc.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.
 */
 
#include <arch.h>
#include <proc/task.h>
#include <proc/thread.h>
#include <errno.h>
#include <memstr.h>
#include <debug.h>
#include <ipc/ipc.h>
#include <ipc/sysipc.h>
#include <ipc/irq.h>
#include <ipc/ipcrsc.h>
#include <arch/interrupt.h>
#include <print.h>
#include <syscall/copy.h>
#include <security/cap.h>
#include <mm/as.h>
 
#define GET_CHECK_PHONE(phone,phoneid,err) { \
      if (phoneid > IPC_MAX_PHONES) { err; } \
      phone = &TASK->phones[phoneid]; \
}
 
#define STRUCT_TO_USPACE(dst,src) copy_to_uspace(dst,src,sizeof(*(src)))
 
/** Return true if the method is a system method */
static inline int is_system_method(__native method)
{
    if (method <= IPC_M_LAST_SYSTEM)
        return 1;
    return 0;
}
 
/** Return true if the message with this method is forwardable
 *
 * - some system messages may be forwarded, for some of them
 *   it is useless
 */
static inline int is_forwardable(__native method)
{
    if (method == IPC_M_PHONE_HUNGUP || method == IPC_M_AS_AREA_SEND \
        || method == IPC_M_AS_AREA_RECV)
        return 0; /* This message is meant only for the receiver */
    return 1;
}
 
/****************************************************/
/* Functions that preprocess answer before sending
 * it to the recepient
 */
 
/** Return true if the caller (ipc_answer) should save
 * the old call contents for answer_preprocess
 */
static inline int answer_need_old(call_t *call)
{
    if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_TO_ME)
        return 1;
    if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_ME_TO)
        return 1;
    if (IPC_GET_METHOD(call->data) == IPC_M_AS_AREA_SEND)
        return 1;
    if (IPC_GET_METHOD(call->data) == IPC_M_AS_AREA_RECV)
        return 1;
    return 0;
}
 
/** Interpret process answer as control information
 *
 * This function is called directly after sys_ipc_answer
 */
static inline int answer_preprocess(call_t *answer, ipc_data_t *olddata)
{
    int phoneid;
 
    if (IPC_GET_RETVAL(answer->data) == EHANGUP) {
        /* In case of forward, hangup the forwared phone,
         * not the originator
         */
        spinlock_lock(&answer->data.phone->lock);
        spinlock_lock(&TASK->answerbox.lock);
        if (answer->data.phone->callee) {
            list_remove(&answer->data.phone->list);
            answer->data.phone->callee = 0;
        }
        spinlock_unlock(&TASK->answerbox.lock);
        spinlock_unlock(&answer->data.phone->lock);
    }
 
    if (!olddata)
        return 0;
 
    if (IPC_GET_METHOD(*olddata) == IPC_M_CONNECT_TO_ME) {
        phoneid = IPC_GET_ARG3(*olddata);
        if (IPC_GET_RETVAL(answer->data)) {
            /* The connection was not accepted */
            phone_dealloc(phoneid);
        } else {
            /* The connection was accepted */
            phone_connect(phoneid,&answer->sender->answerbox);
            /* Set 'phone identification' as arg3 of response */
            IPC_SET_ARG3(answer->data, (__native)&TASK->phones[phoneid]);
        }
    } else if (IPC_GET_METHOD(*olddata) == IPC_M_CONNECT_ME_TO) {
        /* If the users accepted call, connect */
        if (!IPC_GET_RETVAL(answer->data)) {
            ipc_phone_connect((phone_t *)IPC_GET_ARG3(*olddata),
                      &TASK->answerbox);
        }
    } else if (IPC_GET_METHOD(*olddata) == IPC_M_AS_AREA_SEND) {
        if (!IPC_GET_RETVAL(answer->data)) { /* Accepted, handle as_area receipt */
            ipl_t ipl;
            int rc;
            as_t *as;
           
            ipl = interrupts_disable();
            spinlock_lock(&answer->sender->lock);
            as = answer->sender->as;
            spinlock_unlock(&answer->sender->lock);
            interrupts_restore(ipl);
           
            rc = as_area_share(as, IPC_GET_ARG1(*olddata), IPC_GET_ARG2(*olddata),
                       AS, IPC_GET_ARG1(answer->data), IPC_GET_ARG3(*olddata));
            IPC_SET_RETVAL(answer->data, rc);
            return rc;
        }
    } else if (IPC_GET_METHOD(*olddata) == IPC_M_AS_AREA_RECV) {
        if (!IPC_GET_RETVAL(answer->data)) {
            ipl_t ipl;
            as_t *as;
            int rc;
           
            ipl = interrupts_disable();
            spinlock_lock(&answer->sender->lock);
            as = answer->sender->as;
            spinlock_unlock(&answer->sender->lock);
            interrupts_restore(ipl);
           
            rc = as_area_share(AS, IPC_GET_ARG1(answer->data), IPC_GET_ARG2(*olddata),
                       as, IPC_GET_ARG1(*olddata), IPC_GET_ARG2(answer->data));
            IPC_SET_RETVAL(answer->data, rc);
        }
    }
    return 0;
}
 
/** Called before the request is sent
 *
 * @return 0 - no error, -1 - report error to user
 */
static int request_preprocess(call_t *call)
{
    int newphid;
    size_t size;
 
    switch (IPC_GET_METHOD(call->data)) {
    case IPC_M_CONNECT_ME_TO:
        newphid = phone_alloc();
        if (newphid < 0)
            return ELIMIT;
        /* Set arg3 for server */
        IPC_SET_ARG3(call->data, (__native)&TASK->phones[newphid]);
        call->flags |= IPC_CALL_CONN_ME_TO;
        call->private = newphid;
        break;
    case IPC_M_AS_AREA_SEND:
        size = as_get_size(IPC_GET_ARG1(call->data));
        if (!size) {
            return EPERM;
        }
        IPC_SET_ARG2(call->data, size);
        break;
    default:
        break;
    }
    return 0;
}
 
/****************************************************/
/* Functions called to process received call/answer
 * before passing to uspace
 */
 
/** Do basic kernel processing of received call answer */
static void process_answer(call_t *call)
{
    if (IPC_GET_RETVAL(call->data) == EHANGUP && \
        call->flags & IPC_CALL_FORWARDED)
        IPC_SET_RETVAL(call->data, EFORWARD);
 
    if (call->flags & IPC_CALL_CONN_ME_TO) {
        if (IPC_GET_RETVAL(call->data))
            phone_dealloc(call->private);
        else
            IPC_SET_ARG3(call->data, call->private);
    }
}
 
/** Do basic kernel processing of received call request
 *
 * @return 0 - the call should be passed to userspace, 1 - ignore call
 */
static int process_request(answerbox_t *box,call_t *call)
{
    int phoneid;
 
    if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_TO_ME) {
        phoneid = phone_alloc();
        if (phoneid < 0) { /* Failed to allocate phone */
            IPC_SET_RETVAL(call->data, ELIMIT);
            ipc_answer(box,call);
            return -1;
        }
        IPC_SET_ARG3(call->data, phoneid);
    }
    return 0;
}
 
/** Send a call over IPC, wait for reply, return to user
 *
 * @return Call identification, returns -1 on fatal error,
           -2 on 'Too many async request, handle answers first
 */
__native sys_ipc_call_sync_fast(__native phoneid, __native method,
                __native arg1, ipc_data_t *data)
{
    call_t call;
    phone_t *phone;
    int res;
 
    GET_CHECK_PHONE(phone, phoneid, return ENOENT);
 
    ipc_call_static_init(&call);
    IPC_SET_METHOD(call.data, method);
    IPC_SET_ARG1(call.data, arg1);
 
    if (!(res=request_preprocess(&call))) {
        ipc_call_sync(phone, &call);
        process_answer(&call);
    } else
        IPC_SET_RETVAL(call.data, res);
    STRUCT_TO_USPACE(&data->args, &call.data.args);
 
    return 0;
}
 
/** Synchronous IPC call allowing to send whole message */
__native sys_ipc_call_sync(__native phoneid, ipc_data_t *question,
               ipc_data_t *reply)
{
    call_t call;
    phone_t *phone;
    int res;
    int rc;
 
    ipc_call_static_init(&call);
    rc = copy_from_uspace(&call.data.args, &question->args, sizeof(call.data.args));
    if (rc != 0)
        return (__native) rc;
 
    GET_CHECK_PHONE(phone, phoneid, return ENOENT);
 
    if (!(res=request_preprocess(&call))) {
        ipc_call_sync(phone, &call);
        process_answer(&call);
    } else
        IPC_SET_RETVAL(call.data, res);
 
    rc = STRUCT_TO_USPACE(&reply->args, &call.data.args);
    if (rc != 0)
        return rc;
 
    return 0;
}
 
/** Check that the task did not exceed allowed limit
 *
 * @return 0 - Limit OK,   -1 - limit exceeded
 */
static int check_call_limit(void)
{
    if (atomic_preinc(&TASK->active_calls) > IPC_MAX_ASYNC_CALLS) {
        atomic_dec(&TASK->active_calls);
        return -1;
    }
    return 0;
}
 
/** Send an asynchronous call over ipc
 *
 * @return Call identification, returns -1 on fatal error,
           -2 on 'Too many async request, handle answers first
 */
__native sys_ipc_call_async_fast(__native phoneid, __native method,
                 __native arg1, __native arg2)
{
    call_t *call;
    phone_t *phone;
    int res;
 
    if (check_call_limit())
        return IPC_CALLRET_TEMPORARY;
 
    GET_CHECK_PHONE(phone, phoneid, return IPC_CALLRET_FATAL);
 
    call = ipc_call_alloc(0);
    IPC_SET_METHOD(call->data, method);
    IPC_SET_ARG1(call->data, arg1);
    IPC_SET_ARG2(call->data, arg2);
 
    if (!(res=request_preprocess(call)))
        ipc_call(phone, call);
    else
        ipc_backsend_err(phone, call, res);
 
    return (__native) call;
}
 
/** Synchronous IPC call allowing to send whole message
 *
 * @return The same as sys_ipc_call_async
 */
__native sys_ipc_call_async(__native phoneid, ipc_data_t *data)
{
    call_t *call;
    phone_t *phone;
    int res;
    int rc;
 
    if (check_call_limit())
        return IPC_CALLRET_TEMPORARY;
 
    GET_CHECK_PHONE(phone, phoneid, return IPC_CALLRET_FATAL);
 
    call = ipc_call_alloc(0);
    rc = copy_from_uspace(&call->data.args, &data->args, sizeof(call->data.args));
    if (rc != 0) {
        ipc_call_free(call);
        return (__native) rc;
    }
    if (!(res=request_preprocess(call)))
        ipc_call(phone, call);
    else
        ipc_backsend_err(phone, call, res);
 
    return (__native) call;
}
 
/** Forward received call to another destination
 *
 * The arg1 and arg2 are changed in the forwarded message
 *
 * Warning: If implementing non-fast version, make sure that
 *          arg3 is not rewritten for certain system IPC
 */
__native sys_ipc_forward_fast(__native callid, __native phoneid,
                  __native method, __native arg1)
{
    call_t *call;
    phone_t *phone;
 
    call = get_call(callid);
    if (!call)
        return ENOENT;
 
    call->flags |= IPC_CALL_FORWARDED;
 
    GET_CHECK_PHONE(phone, phoneid, {
        IPC_SET_RETVAL(call->data, EFORWARD);
        ipc_answer(&TASK->answerbox, call);
        return ENOENT;
    });    
 
    if (!is_forwardable(IPC_GET_METHOD(call->data))) {
        IPC_SET_RETVAL(call->data, EFORWARD);
        ipc_answer(&TASK->answerbox, call);
        return EPERM;
    }
 
    /* Userspace is not allowed to change method of system methods
     * on forward, allow changing ARG1 and ARG2 by means of method and arg1
     */
    if (is_system_method(IPC_GET_METHOD(call->data))) {
        if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_TO_ME)
            phone_dealloc(IPC_GET_ARG3(call->data));
 
        IPC_SET_ARG1(call->data, method);
        IPC_SET_ARG2(call->data, arg1);
    } else {
        IPC_SET_METHOD(call->data, method);
        IPC_SET_ARG1(call->data, arg1);
    }
 
    return ipc_forward(call, phone, &TASK->answerbox);
}
 
/** Send IPC answer */
__native sys_ipc_answer_fast(__native callid, __native retval,
                 __native arg1, __native arg2)
{
    call_t *call;
    ipc_data_t saved_data;
    int saveddata = 0;
    int rc;
 
    /* Do not answer notification callids */
    if (callid & IPC_CALLID_NOTIFICATION)
        return 0;
 
    call = get_call(callid);
    if (!call)
        return ENOENT;
 
    if (answer_need_old(call)) {
        memcpy(&saved_data, &call->data, sizeof(call->data));
        saveddata = 1;
    }
 
    IPC_SET_RETVAL(call->data, retval);
    IPC_SET_ARG1(call->data, arg1);
    IPC_SET_ARG2(call->data, arg2);
    rc = answer_preprocess(call, saveddata ? &saved_data : NULL);
 
    ipc_answer(&TASK->answerbox, call);
    return rc;
}
 
/** Send IPC answer */
__native sys_ipc_answer(__native callid, ipc_data_t *data)
{
    call_t *call;
    ipc_data_t saved_data;
    int saveddata = 0;
    int rc;
 
    /* Do not answer notification callids */
    if (callid & IPC_CALLID_NOTIFICATION)
        return 0;
 
    call = get_call(callid);
    if (!call)
        return ENOENT;
 
    if (answer_need_old(call)) {
        memcpy(&saved_data, &call->data, sizeof(call->data));
        saveddata = 1;
    }
    rc = copy_from_uspace(&call->data.args, &data->args,
             sizeof(call->data.args));
    if (rc != 0)
        return rc;
 
    rc = answer_preprocess(call, saveddata ? &saved_data : NULL);
   
    ipc_answer(&TASK->answerbox, call);
 
    return rc;
}
 
/** Hang up the phone
 *
 */
__native sys_ipc_hangup(int phoneid)
{
    phone_t *phone;
 
    GET_CHECK_PHONE(phone, phoneid, return ENOENT);
 
    if (ipc_phone_hangup(phone))
        return -1;
 
    return 0;
}
 
/** Wait for incoming ipc call or answer
 *
 * @param calldata Pointer to buffer where the call/answer data is stored
 * @param usec Timeout. See waitq_sleep_timeout() for explanation.
 * @param nonblocking See waitq_sleep_timeout() for explanation.
 *
 * @return Callid, if callid & 1, then the call is answer
 */
__native sys_ipc_wait_for_call(ipc_data_t *calldata, __u32 usec, int nonblocking)
{
    call_t *call;
 
restart:   
    call = ipc_wait_for_call(&TASK->answerbox, usec, nonblocking);
    if (!call)
        return 0;
 
    if (call->flags & IPC_CALL_NOTIF) {
        ASSERT(! (call->flags & IPC_CALL_STATIC_ALLOC));
        STRUCT_TO_USPACE(&calldata->args, &call->data.args);
        ipc_call_free(call);
       
        return ((__native)call) | IPC_CALLID_NOTIFICATION;
    }
 
    if (call->flags & IPC_CALL_ANSWERED) {
        process_answer(call);
 
        ASSERT(! (call->flags & IPC_CALL_STATIC_ALLOC));
 
        atomic_dec(&TASK->active_calls);
 
        if (call->flags & IPC_CALL_DISCARD_ANSWER) {
            ipc_call_free(call);
            goto restart;
        }
 
        STRUCT_TO_USPACE(&calldata->args, &call->data.args);
        ipc_call_free(call);
 
        return ((__native)call) | IPC_CALLID_ANSWERED;
    }
 
    if (process_request(&TASK->answerbox, call))
        goto restart;
 
    /* Include phone address('id') of the caller in the request,
     * copy whole call->data, not only call->data.args */
    if (STRUCT_TO_USPACE(calldata, &call->data)) {
        return 0;
    }
    return (__native)call;
}
 
/** Connect irq handler to task */
__native sys_ipc_register_irq(__native irq, irq_code_t *ucode)
{
    if (!(cap_get(TASK) & CAP_IRQ_REG))
        return EPERM;
 
    if (irq >= IRQ_COUNT)
        return (__native) ELIMIT;
 
    irq_ipc_bind_arch(irq);
 
    return ipc_irq_register(&TASK->answerbox, irq, ucode);
}
 
/* Disconnect irq handler from task */
__native sys_ipc_unregister_irq(__native irq)
{
    if (!(cap_get(TASK) & CAP_IRQ_REG))
        return EPERM;
 
    if (irq >= IRQ_COUNT)
        return (__native) ELIMIT;
 
    ipc_irq_unregister(&TASK->answerbox, irq);
 
    return 0;
}
 

Rev 1434	Rev 1461
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	#include <arch.h>	29	#include <arch.h>
30	#include <proc/task.h>	30	#include <proc/task.h>
31	#include <proc/thread.h>	31	#include <proc/thread.h>
32	#include <errno.h>	32	#include <errno.h>
33	#include <memstr.h>	33	#include <memstr.h>
34	#include <debug.h>	34	#include <debug.h>
35	#include <ipc/ipc.h>	35	#include <ipc/ipc.h>
36	#include <ipc/sysipc.h>	36	#include <ipc/sysipc.h>
37	#include <ipc/irq.h>	37	#include <ipc/irq.h>
38	#include <ipc/ipcrsc.h>	38	#include <ipc/ipcrsc.h>
39	#include <arch/interrupt.h>	39	#include <arch/interrupt.h>
40	#include <print.h>	40	#include <print.h>
41	#include <syscall/copy.h>	41	#include <syscall/copy.h>
42	#include <security/cap.h>	42	#include <security/cap.h>
43	#include <mm/as.h>	43	#include <mm/as.h>
44		44
45	#define GET_CHECK_PHONE(phone,phoneid,err) { \	45	#define GET_CHECK_PHONE(phone,phoneid,err) { \
46	if (phoneid > IPC_MAX_PHONES) { err; } \	46	if (phoneid > IPC_MAX_PHONES) { err; } \
47	phone = &TASK->phones[phoneid]; \	47	phone = &TASK->phones[phoneid]; \
48	}	48	}
49		49
50	#define STRUCT_TO_USPACE(dst,src) copy_to_uspace(dst,src,sizeof(*(src)))	50	#define STRUCT_TO_USPACE(dst,src) copy_to_uspace(dst,src,sizeof(*(src)))
51		51
52	/** Return true if the method is a system method */	52	/** Return true if the method is a system method */
53	static inline int is_system_method(__native method)	53	static inline int is_system_method(__native method)
54	{	54	{
55	if (method <= IPC_M_LAST_SYSTEM)	55	if (method <= IPC_M_LAST_SYSTEM)
56	return 1;	56	return 1;
57	return 0;	57	return 0;
58	}	58	}
59		59
60	/** Return true if the message with this method is forwardable	60	/** Return true if the message with this method is forwardable
61	*	61	*
62	* - some system messages may be forwarded, for some of them	62	* - some system messages may be forwarded, for some of them
63	* it is useless	63	* it is useless
64	*/	64	*/
65	static inline int is_forwardable(__native method)	65	static inline int is_forwardable(__native method)
66	{	66	{
67	if (method == IPC_M_PHONE_HUNGUP \|\| method == IPC_M_AS_AREA_SEND \	67	if (method == IPC_M_PHONE_HUNGUP \|\| method == IPC_M_AS_AREA_SEND \
68	\|\| method == IPC_M_AS_AREA_RECV)	68	\|\| method == IPC_M_AS_AREA_RECV)
69	return 0; /* This message is meant only for the receiver */	69	return 0; /* This message is meant only for the receiver */
70	return 1;	70	return 1;
71	}	71	}
72		72
73	/****************************************************/	73	/****************************************************/
74	/* Functions that preprocess answer before sending	74	/* Functions that preprocess answer before sending
75	* it to the recepient	75	* it to the recepient
76	*/	76	*/
77		77
78	/** Return true if the caller (ipc_answer) should save	78	/** Return true if the caller (ipc_answer) should save
79	* the old call contents for answer_preprocess	79	* the old call contents for answer_preprocess
80	*/	80	*/
81	static inline int answer_need_old(call_t *call)	81	static inline int answer_need_old(call_t *call)
82	{	82	{
83	if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_TO_ME)	83	if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_TO_ME)
84	return 1;	84	return 1;
85	if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_ME_TO)	85	if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_ME_TO)
86	return 1;	86	return 1;
87	if (IPC_GET_METHOD(call->data) == IPC_M_AS_AREA_SEND)	87	if (IPC_GET_METHOD(call->data) == IPC_M_AS_AREA_SEND)
88	return 1;	88	return 1;
89	if (IPC_GET_METHOD(call->data) == IPC_M_AS_AREA_RECV)	89	if (IPC_GET_METHOD(call->data) == IPC_M_AS_AREA_RECV)
90	return 1;	90	return 1;
91	return 0;	91	return 0;
92	}	92	}
93		93
94	/** Interpret process answer as control information	94	/** Interpret process answer as control information
95	*	95	*
96	* This function is called directly after sys_ipc_answer	96	* This function is called directly after sys_ipc_answer
97	*/	97	*/
98	static inline int answer_preprocess(call_t answer, ipc_data_t olddata)	98	static inline int answer_preprocess(call_t answer, ipc_data_t olddata)
99	{	99	{
100	int phoneid;	100	int phoneid;
101		101
102	if (IPC_GET_RETVAL(answer->data) == EHANGUP) {	102	if (IPC_GET_RETVAL(answer->data) == EHANGUP) {
103	/* In case of forward, hangup the forwared phone,	103	/* In case of forward, hangup the forwared phone,
104	* not the originator	104	* not the originator
105	*/	105	*/
106	spinlock_lock(&answer->data.phone->lock);	106	spinlock_lock(&answer->data.phone->lock);
107	spinlock_lock(&TASK->answerbox.lock);	107	spinlock_lock(&TASK->answerbox.lock);
108	if (answer->data.phone->callee) {	108	if (answer->data.phone->callee) {
109	list_remove(&answer->data.phone->list);	109	list_remove(&answer->data.phone->list);
110	answer->data.phone->callee = 0;	110	answer->data.phone->callee = 0;
111	}	111	}
112	spinlock_unlock(&TASK->answerbox.lock);	112	spinlock_unlock(&TASK->answerbox.lock);
113	spinlock_unlock(&answer->data.phone->lock);	113	spinlock_unlock(&answer->data.phone->lock);
114	}	114	}
115		115
116	if (!olddata)	116	if (!olddata)
117	return 0;	117	return 0;
118		118
119	if (IPC_GET_METHOD(*olddata) == IPC_M_CONNECT_TO_ME) {	119	if (IPC_GET_METHOD(*olddata) == IPC_M_CONNECT_TO_ME) {
120	phoneid = IPC_GET_ARG3(*olddata);	120	phoneid = IPC_GET_ARG3(*olddata);
121	if (IPC_GET_RETVAL(answer->data)) {	121	if (IPC_GET_RETVAL(answer->data)) {
122	/* The connection was not accepted */	122	/* The connection was not accepted */
123	phone_dealloc(phoneid);	123	phone_dealloc(phoneid);
124	} else {	124	} else {
125	/* The connection was accepted */	125	/* The connection was accepted */
126	phone_connect(phoneid,&answer->sender->answerbox);	126	phone_connect(phoneid,&answer->sender->answerbox);
127	/* Set 'phone identification' as arg3 of response */	127	/* Set 'phone identification' as arg3 of response */
128	IPC_SET_ARG3(answer->data, (__native)&TASK->phones[phoneid]);	128	IPC_SET_ARG3(answer->data, (__native)&TASK->phones[phoneid]);
129	}	129	}
130	} else if (IPC_GET_METHOD(*olddata) == IPC_M_CONNECT_ME_TO) {	130	} else if (IPC_GET_METHOD(*olddata) == IPC_M_CONNECT_ME_TO) {
131	/* If the users accepted call, connect */	131	/* If the users accepted call, connect */
132	if (!IPC_GET_RETVAL(answer->data)) {	132	if (!IPC_GET_RETVAL(answer->data)) {
133	ipc_phone_connect((phone_t )IPC_GET_ARG3(olddata),	133	ipc_phone_connect((phone_t )IPC_GET_ARG3(olddata),
134	&TASK->answerbox);	134	&TASK->answerbox);
135	}	135	}
136	} else if (IPC_GET_METHOD(*olddata) == IPC_M_AS_AREA_SEND) {	136	} else if (IPC_GET_METHOD(*olddata) == IPC_M_AS_AREA_SEND) {
137	if (!IPC_GET_RETVAL(answer->data)) { /* Accepted, handle as_area receipt */	137	if (!IPC_GET_RETVAL(answer->data)) { /* Accepted, handle as_area receipt */
138	ipl_t ipl;	138	ipl_t ipl;
-		139	int rc;
139	as_t *as;	140	as_t *as;
140		141
141	ipl = interrupts_disable();	142	ipl = interrupts_disable();
142	spinlock_lock(&answer->sender->lock);	143	spinlock_lock(&answer->sender->lock);
143	as = answer->sender->as;	144	as = answer->sender->as;
144	spinlock_unlock(&answer->sender->lock);	145	spinlock_unlock(&answer->sender->lock);
145	interrupts_restore(ipl);	146	interrupts_restore(ipl);
146		147
147	return as_area_share(as, IPC_GET_ARG1(olddata), IPC_GET_ARG2(olddata),	148	rc = as_area_share(as, IPC_GET_ARG1(olddata), IPC_GET_ARG2(olddata),
148	AS, IPC_GET_ARG1(answer->data), IPC_GET_ARG3(*olddata));	149	AS, IPC_GET_ARG1(answer->data), IPC_GET_ARG3(*olddata));
-		150	IPC_SET_RETVAL(answer->data, rc);
-		151	return rc;
149	}	152	}
150	} else if (IPC_GET_METHOD(*olddata) == IPC_M_AS_AREA_RECV) {	153	} else if (IPC_GET_METHOD(*olddata) == IPC_M_AS_AREA_RECV) {
151	if (!IPC_GET_RETVAL(answer->data)) {	154	if (!IPC_GET_RETVAL(answer->data)) {
152	ipl_t ipl;	155	ipl_t ipl;
153	as_t *as;	156	as_t *as;
154	int rc;	157	int rc;
155		158
156	ipl = interrupts_disable();	159	ipl = interrupts_disable();
157	spinlock_lock(&answer->sender->lock);	160	spinlock_lock(&answer->sender->lock);
158	as = answer->sender->as;	161	as = answer->sender->as;
159	spinlock_unlock(&answer->sender->lock);	162	spinlock_unlock(&answer->sender->lock);
160	interrupts_restore(ipl);	163	interrupts_restore(ipl);
161		164
162	rc = as_area_share(AS, IPC_GET_ARG1(answer->data), IPC_GET_ARG2(*olddata),	165	rc = as_area_share(AS, IPC_GET_ARG1(answer->data), IPC_GET_ARG2(*olddata),
163	as, IPC_GET_ARG1(olddata), IPC_GET_ARG3(olddata));	166	as, IPC_GET_ARG1(*olddata), IPC_GET_ARG2(answer->data));
164	IPC_SET_RETVAL(answer->data, rc);	167	IPC_SET_RETVAL(answer->data, rc);
165	}	168	}
166	}	169	}
167	return 0;	170	return 0;
168	}	171	}
169		172
170	/** Called before the request is sent	173	/** Called before the request is sent
171	*	174	*
172	* @return 0 - no error, -1 - report error to user	175	* @return 0 - no error, -1 - report error to user
173	*/	176	*/
174	static int request_preprocess(call_t *call)	177	static int request_preprocess(call_t *call)
175	{	178	{
176	int newphid;	179	int newphid;
177	size_t size;	180	size_t size;
178		181
179	switch (IPC_GET_METHOD(call->data)) {	182	switch (IPC_GET_METHOD(call->data)) {
180	case IPC_M_CONNECT_ME_TO:	183	case IPC_M_CONNECT_ME_TO:
181	newphid = phone_alloc();	184	newphid = phone_alloc();
182	if (newphid < 0)	185	if (newphid < 0)
183	return ELIMIT;	186	return ELIMIT;
184	/* Set arg3 for server */	187	/* Set arg3 for server */
185	IPC_SET_ARG3(call->data, (__native)&TASK->phones[newphid]);	188	IPC_SET_ARG3(call->data, (__native)&TASK->phones[newphid]);
186	call->flags \|= IPC_CALL_CONN_ME_TO;	189	call->flags \|= IPC_CALL_CONN_ME_TO;
187	call->private = newphid;	190	call->private = newphid;
188	break;	191	break;
189	case IPC_M_AS_AREA_SEND:	192	case IPC_M_AS_AREA_SEND:
190	size = as_get_size(IPC_GET_ARG1(call->data));	193	size = as_get_size(IPC_GET_ARG1(call->data));
191	if (!size) {	194	if (!size) {
192	return EPERM;	195	return EPERM;
193	}	196	}
194	IPC_SET_ARG2(call->data, size);	197	IPC_SET_ARG2(call->data, size);
195	break;	198	break;
196	default:	199	default:
197	break;	200	break;
198	}	201	}
199	return 0;	202	return 0;
200	}	203	}
201		204
202	/****************************************************/	205	/****************************************************/
203	/* Functions called to process received call/answer	206	/* Functions called to process received call/answer
204	* before passing to uspace	207	* before passing to uspace
205	*/	208	*/
206		209
207	/** Do basic kernel processing of received call answer */	210	/** Do basic kernel processing of received call answer */
208	static void process_answer(call_t *call)	211	static void process_answer(call_t *call)
209	{	212	{
210	if (IPC_GET_RETVAL(call->data) == EHANGUP && \	213	if (IPC_GET_RETVAL(call->data) == EHANGUP && \
211	call->flags & IPC_CALL_FORWARDED)	214	call->flags & IPC_CALL_FORWARDED)
212	IPC_SET_RETVAL(call->data, EFORWARD);	215	IPC_SET_RETVAL(call->data, EFORWARD);
213		216
214	if (call->flags & IPC_CALL_CONN_ME_TO) {	217	if (call->flags & IPC_CALL_CONN_ME_TO) {
215	if (IPC_GET_RETVAL(call->data))	218	if (IPC_GET_RETVAL(call->data))
216	phone_dealloc(call->private);	219	phone_dealloc(call->private);
217	else	220	else
218	IPC_SET_ARG3(call->data, call->private);	221	IPC_SET_ARG3(call->data, call->private);
219	}	222	}
220	}	223	}
221		224
222	/** Do basic kernel processing of received call request	225	/** Do basic kernel processing of received call request
223	*	226	*
224	* @return 0 - the call should be passed to userspace, 1 - ignore call	227	* @return 0 - the call should be passed to userspace, 1 - ignore call
225	*/	228	*/
226	static int process_request(answerbox_t box,call_t call)	229	static int process_request(answerbox_t box,call_t call)
227	{	230	{
228	int phoneid;	231	int phoneid;
229		232
230	if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_TO_ME) {	233	if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_TO_ME) {
231	phoneid = phone_alloc();	234	phoneid = phone_alloc();
232	if (phoneid < 0) { /* Failed to allocate phone */	235	if (phoneid < 0) { /* Failed to allocate phone */
233	IPC_SET_RETVAL(call->data, ELIMIT);	236	IPC_SET_RETVAL(call->data, ELIMIT);
234	ipc_answer(box,call);	237	ipc_answer(box,call);
235	return -1;	238	return -1;
236	}	239	}
237	IPC_SET_ARG3(call->data, phoneid);	240	IPC_SET_ARG3(call->data, phoneid);
238	}	241	}
239	return 0;	242	return 0;
240	}	243	}
241		244
242	/** Send a call over IPC, wait for reply, return to user	245	/** Send a call over IPC, wait for reply, return to user
243	*	246	*
244	* @return Call identification, returns -1 on fatal error,	247	* @return Call identification, returns -1 on fatal error,
245	-2 on 'Too many async request, handle answers first	248	-2 on 'Too many async request, handle answers first
246	*/	249	*/
247	__native sys_ipc_call_sync_fast(__native phoneid, __native method,	250	__native sys_ipc_call_sync_fast(__native phoneid, __native method,
248	__native arg1, ipc_data_t *data)	251	__native arg1, ipc_data_t *data)
249	{	252	{
250	call_t call;	253	call_t call;
251	phone_t *phone;	254	phone_t *phone;
252	int res;	255	int res;
253		256
254	GET_CHECK_PHONE(phone, phoneid, return ENOENT);	257	GET_CHECK_PHONE(phone, phoneid, return ENOENT);
255		258
256	ipc_call_static_init(&call);	259	ipc_call_static_init(&call);
257	IPC_SET_METHOD(call.data, method);	260	IPC_SET_METHOD(call.data, method);
258	IPC_SET_ARG1(call.data, arg1);	261	IPC_SET_ARG1(call.data, arg1);
259		262
260	if (!(res=request_preprocess(&call))) {	263	if (!(res=request_preprocess(&call))) {
261	ipc_call_sync(phone, &call);	264	ipc_call_sync(phone, &call);
262	process_answer(&call);	265	process_answer(&call);
263	} else	266	} else
264	IPC_SET_RETVAL(call.data, res);	267	IPC_SET_RETVAL(call.data, res);
265	STRUCT_TO_USPACE(&data->args, &call.data.args);	268	STRUCT_TO_USPACE(&data->args, &call.data.args);
266		269
267	return 0;	270	return 0;
268	}	271	}
269		272
270	/** Synchronous IPC call allowing to send whole message */	273	/** Synchronous IPC call allowing to send whole message */
271	__native sys_ipc_call_sync(__native phoneid, ipc_data_t *question,	274	__native sys_ipc_call_sync(__native phoneid, ipc_data_t *question,
272	ipc_data_t *reply)	275	ipc_data_t *reply)
273	{	276	{
274	call_t call;	277	call_t call;
275	phone_t *phone;	278	phone_t *phone;
276	int res;	279	int res;
277	int rc;	280	int rc;
278		281
279	ipc_call_static_init(&call);	282	ipc_call_static_init(&call);
280	rc = copy_from_uspace(&call.data.args, &question->args, sizeof(call.data.args));	283	rc = copy_from_uspace(&call.data.args, &question->args, sizeof(call.data.args));
281	if (rc != 0)	284	if (rc != 0)
282	return (__native) rc;	285	return (__native) rc;
283		286
284	GET_CHECK_PHONE(phone, phoneid, return ENOENT);	287	GET_CHECK_PHONE(phone, phoneid, return ENOENT);
285		288
286	if (!(res=request_preprocess(&call))) {	289	if (!(res=request_preprocess(&call))) {
287	ipc_call_sync(phone, &call);	290	ipc_call_sync(phone, &call);
288	process_answer(&call);	291	process_answer(&call);
289	} else	292	} else
290	IPC_SET_RETVAL(call.data, res);	293	IPC_SET_RETVAL(call.data, res);
291		294
292	rc = STRUCT_TO_USPACE(&reply->args, &call.data.args);	295	rc = STRUCT_TO_USPACE(&reply->args, &call.data.args);
293	if (rc != 0)	296	if (rc != 0)
294	return rc;	297	return rc;
295		298
296	return 0;	299	return 0;
297	}	300	}
298		301
299	/** Check that the task did not exceed allowed limit	302	/** Check that the task did not exceed allowed limit
300	*	303	*
301	* @return 0 - Limit OK, -1 - limit exceeded	304	* @return 0 - Limit OK, -1 - limit exceeded
302	*/	305	*/
303	static int check_call_limit(void)	306	static int check_call_limit(void)
304	{	307	{
305	if (atomic_preinc(&TASK->active_calls) > IPC_MAX_ASYNC_CALLS) {	308	if (atomic_preinc(&TASK->active_calls) > IPC_MAX_ASYNC_CALLS) {
306	atomic_dec(&TASK->active_calls);	309	atomic_dec(&TASK->active_calls);
307	return -1;	310	return -1;
308	}	311	}
309	return 0;	312	return 0;
310	}	313	}
311		314
312	/** Send an asynchronous call over ipc	315	/** Send an asynchronous call over ipc
313	*	316	*
314	* @return Call identification, returns -1 on fatal error,	317	* @return Call identification, returns -1 on fatal error,
315	-2 on 'Too many async request, handle answers first	318	-2 on 'Too many async request, handle answers first
316	*/	319	*/
317	__native sys_ipc_call_async_fast(__native phoneid, __native method,	320	__native sys_ipc_call_async_fast(__native phoneid, __native method,
318	__native arg1, __native arg2)	321	__native arg1, __native arg2)
319	{	322	{
320	call_t *call;	323	call_t *call;
321	phone_t *phone;	324	phone_t *phone;
322	int res;	325	int res;
323		326
324	if (check_call_limit())	327	if (check_call_limit())
325	return IPC_CALLRET_TEMPORARY;	328	return IPC_CALLRET_TEMPORARY;
326		329
327	GET_CHECK_PHONE(phone, phoneid, return IPC_CALLRET_FATAL);	330	GET_CHECK_PHONE(phone, phoneid, return IPC_CALLRET_FATAL);
328		331
329	call = ipc_call_alloc(0);	332	call = ipc_call_alloc(0);
330	IPC_SET_METHOD(call->data, method);	333	IPC_SET_METHOD(call->data, method);
331	IPC_SET_ARG1(call->data, arg1);	334	IPC_SET_ARG1(call->data, arg1);
332	IPC_SET_ARG2(call->data, arg2);	335	IPC_SET_ARG2(call->data, arg2);
333		336
334	if (!(res=request_preprocess(call)))	337	if (!(res=request_preprocess(call)))
335	ipc_call(phone, call);	338	ipc_call(phone, call);
336	else	339	else
337	ipc_backsend_err(phone, call, res);	340	ipc_backsend_err(phone, call, res);
338		341
339	return (__native) call;	342	return (__native) call;
340	}	343	}
341		344
342	/** Synchronous IPC call allowing to send whole message	345	/** Synchronous IPC call allowing to send whole message
343	*	346	*
344	* @return The same as sys_ipc_call_async	347	* @return The same as sys_ipc_call_async
345	*/	348	*/
346	__native sys_ipc_call_async(__native phoneid, ipc_data_t *data)	349	__native sys_ipc_call_async(__native phoneid, ipc_data_t *data)
347	{	350	{
348	call_t *call;	351	call_t *call;
349	phone_t *phone;	352	phone_t *phone;
350	int res;	353	int res;
351	int rc;	354	int rc;
352		355
353	if (check_call_limit())	356	if (check_call_limit())
354	return IPC_CALLRET_TEMPORARY;	357	return IPC_CALLRET_TEMPORARY;
355		358
356	GET_CHECK_PHONE(phone, phoneid, return IPC_CALLRET_FATAL);	359	GET_CHECK_PHONE(phone, phoneid, return IPC_CALLRET_FATAL);
357		360
358	call = ipc_call_alloc(0);	361	call = ipc_call_alloc(0);
359	rc = copy_from_uspace(&call->data.args, &data->args, sizeof(call->data.args));	362	rc = copy_from_uspace(&call->data.args, &data->args, sizeof(call->data.args));
360	if (rc != 0) {	363	if (rc != 0) {
361	ipc_call_free(call);	364	ipc_call_free(call);
362	return (__native) rc;	365	return (__native) rc;
363	}	366	}
364	if (!(res=request_preprocess(call)))	367	if (!(res=request_preprocess(call)))
365	ipc_call(phone, call);	368	ipc_call(phone, call);
366	else	369	else
367	ipc_backsend_err(phone, call, res);	370	ipc_backsend_err(phone, call, res);
368		371
369	return (__native) call;	372	return (__native) call;
370	}	373	}
371		374
372	/** Forward received call to another destination	375	/** Forward received call to another destination
373	*	376	*
374	* The arg1 and arg2 are changed in the forwarded message	377	* The arg1 and arg2 are changed in the forwarded message
375	*	378	*
376	* Warning: If implementing non-fast version, make sure that	379	* Warning: If implementing non-fast version, make sure that
377	* arg3 is not rewritten for certain system IPC	380	* arg3 is not rewritten for certain system IPC
378	*/	381	*/
379	__native sys_ipc_forward_fast(__native callid, __native phoneid,	382	__native sys_ipc_forward_fast(__native callid, __native phoneid,
380	__native method, __native arg1)	383	__native method, __native arg1)
381	{	384	{
382	call_t *call;	385	call_t *call;
383	phone_t *phone;	386	phone_t *phone;
384		387
385	call = get_call(callid);	388	call = get_call(callid);
386	if (!call)	389	if (!call)
387	return ENOENT;	390	return ENOENT;
388		391
389	call->flags \|= IPC_CALL_FORWARDED;	392	call->flags \|= IPC_CALL_FORWARDED;
390		393
391	GET_CHECK_PHONE(phone, phoneid, {	394	GET_CHECK_PHONE(phone, phoneid, {
392	IPC_SET_RETVAL(call->data, EFORWARD);	395	IPC_SET_RETVAL(call->data, EFORWARD);
393	ipc_answer(&TASK->answerbox, call);	396	ipc_answer(&TASK->answerbox, call);
394	return ENOENT;	397	return ENOENT;
395	});	398	});
396		399
397	if (!is_forwardable(IPC_GET_METHOD(call->data))) {	400	if (!is_forwardable(IPC_GET_METHOD(call->data))) {
398	IPC_SET_RETVAL(call->data, EFORWARD);	401	IPC_SET_RETVAL(call->data, EFORWARD);
399	ipc_answer(&TASK->answerbox, call);	402	ipc_answer(&TASK->answerbox, call);
400	return EPERM;	403	return EPERM;
401	}	404	}
402		405
403	/* Userspace is not allowed to change method of system methods	406	/* Userspace is not allowed to change method of system methods
404	* on forward, allow changing ARG1 and ARG2 by means of method and arg1	407	* on forward, allow changing ARG1 and ARG2 by means of method and arg1
405	*/	408	*/
406	if (is_system_method(IPC_GET_METHOD(call->data))) {	409	if (is_system_method(IPC_GET_METHOD(call->data))) {
407	if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_TO_ME)	410	if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_TO_ME)
408	phone_dealloc(IPC_GET_ARG3(call->data));	411	phone_dealloc(IPC_GET_ARG3(call->data));
409		412
410	IPC_SET_ARG1(call->data, method);	413	IPC_SET_ARG1(call->data, method);
411	IPC_SET_ARG2(call->data, arg1);	414	IPC_SET_ARG2(call->data, arg1);
412	} else {	415	} else {
413	IPC_SET_METHOD(call->data, method);	416	IPC_SET_METHOD(call->data, method);
414	IPC_SET_ARG1(call->data, arg1);	417	IPC_SET_ARG1(call->data, arg1);
415	}	418	}
416		419
417	return ipc_forward(call, phone, &TASK->answerbox);	420	return ipc_forward(call, phone, &TASK->answerbox);
418	}	421	}
419		422
420	/** Send IPC answer */	423	/** Send IPC answer */
421	__native sys_ipc_answer_fast(__native callid, __native retval,	424	__native sys_ipc_answer_fast(__native callid, __native retval,
422	__native arg1, __native arg2)	425	__native arg1, __native arg2)
423	{	426	{
424	call_t *call;	427	call_t *call;
425	ipc_data_t saved_data;	428	ipc_data_t saved_data;
426	int saveddata = 0;	429	int saveddata = 0;
427	int rc;	430	int rc;
428		431
429	/* Do not answer notification callids */	432	/* Do not answer notification callids */
430	if (callid & IPC_CALLID_NOTIFICATION)	433	if (callid & IPC_CALLID_NOTIFICATION)
431	return 0;	434	return 0;
432		435
433	call = get_call(callid);	436	call = get_call(callid);
434	if (!call)	437	if (!call)
435	return ENOENT;	438	return ENOENT;
436		439
437	if (answer_need_old(call)) {	440	if (answer_need_old(call)) {
438	memcpy(&saved_data, &call->data, sizeof(call->data));	441	memcpy(&saved_data, &call->data, sizeof(call->data));
439	saveddata = 1;	442	saveddata = 1;
440	}	443	}
441		444
442	IPC_SET_RETVAL(call->data, retval);	445	IPC_SET_RETVAL(call->data, retval);
443	IPC_SET_ARG1(call->data, arg1);	446	IPC_SET_ARG1(call->data, arg1);
444	IPC_SET_ARG2(call->data, arg2);	447	IPC_SET_ARG2(call->data, arg2);
445	rc = answer_preprocess(call, saveddata ? &saved_data : NULL);	448	rc = answer_preprocess(call, saveddata ? &saved_data : NULL);
446		449
447	ipc_answer(&TASK->answerbox, call);	450	ipc_answer(&TASK->answerbox, call);
448	return rc;	451	return rc;
449	}	452	}
450		453
451	/** Send IPC answer */	454	/** Send IPC answer */
452	__native sys_ipc_answer(__native callid, ipc_data_t *data)	455	__native sys_ipc_answer(__native callid, ipc_data_t *data)
453	{	456	{
454	call_t *call;	457	call_t *call;
455	ipc_data_t saved_data;	458	ipc_data_t saved_data;
456	int saveddata = 0;	459	int saveddata = 0;
457	int rc;	460	int rc;
458		461
459	/* Do not answer notification callids */	462	/* Do not answer notification callids */
460	if (callid & IPC_CALLID_NOTIFICATION)	463	if (callid & IPC_CALLID_NOTIFICATION)
461	return 0;	464	return 0;
462		465
463	call = get_call(callid);	466	call = get_call(callid);
464	if (!call)	467	if (!call)
465	return ENOENT;	468	return ENOENT;
466		469
467	if (answer_need_old(call)) {	470	if (answer_need_old(call)) {
468	memcpy(&saved_data, &call->data, sizeof(call->data));	471	memcpy(&saved_data, &call->data, sizeof(call->data));
469	saveddata = 1;	472	saveddata = 1;
470	}	473	}
471	rc = copy_from_uspace(&call->data.args, &data->args,	474	rc = copy_from_uspace(&call->data.args, &data->args,
472	sizeof(call->data.args));	475	sizeof(call->data.args));
473	if (rc != 0)	476	if (rc != 0)
474	return rc;	477	return rc;
475		478
476	rc = answer_preprocess(call, saveddata ? &saved_data : NULL);	479	rc = answer_preprocess(call, saveddata ? &saved_data : NULL);
477		480
478	ipc_answer(&TASK->answerbox, call);	481	ipc_answer(&TASK->answerbox, call);
479		482
480	return rc;	483	return rc;
481	}	484	}
482		485
483	/** Hang up the phone	486	/** Hang up the phone
484	*	487	*
485	*/	488	*/
486	__native sys_ipc_hangup(int phoneid)	489	__native sys_ipc_hangup(int phoneid)
487	{	490	{
488	phone_t *phone;	491	phone_t *phone;
489		492
490	GET_CHECK_PHONE(phone, phoneid, return ENOENT);	493	GET_CHECK_PHONE(phone, phoneid, return ENOENT);
491		494
492	if (ipc_phone_hangup(phone))	495	if (ipc_phone_hangup(phone))
493	return -1;	496	return -1;
494		497
495	return 0;	498	return 0;
496	}	499	}
497		500

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/generic/src/ipc/sysipc.c – Rev 1434 → 1461