WebSVN – HelenOS – Diff – /trunk/kernel/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.
 */
 
/** @addtogroup genericipc
 * @{
 */
/** @file
 */
 
#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>
#include <print.h>
 
/** Maximum buffer size allowed for IPC_M_DATA_SEND requests. */
#define DATA_SEND_LIMIT     (64 * 1024)
 
#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)))
 
/** Decide if the method is a system method.
 *
 * @param method    Method to be decided.
 *
 * @return      Return 1 if the method is a system method.
 *          Otherwise return 0.
 */
static inline int method_is_system(unative_t method)
{
    if (method <= IPC_M_LAST_SYSTEM)
        return 1;
    return 0;
}
 
/** Decide if the message with this method is forwardable.
 *
 * - some system messages may be forwarded, for some of them
 *   it is useless
 *
 * @param method    Method to be decided.
 *
 * @return      Return 1 if the method is forwardable.
 *          Otherwise return 0.
 */
static inline int method_is_forwardable(unative_t method)
{
    switch (method) {
    case IPC_M_PHONE_HUNGUP:
        /* This message is meant only for the original recipient. */
        return 0;
    default:
        return 1;
    }
}
 
/** Decide if the message with this method is immutable on forward.
 *
 * - some system messages may be forwarded but their content cannot be altered
 *
 * @param method    Method to be decided.
 *
 * @return      Return 1 if the method is immutable on forward.
 *          Otherwise return 0.
 */
static inline int method_is_immutable(unative_t method)
{
    switch (method) {
    case IPC_M_AS_AREA_SEND:
    case IPC_M_AS_AREA_RECV:
    case IPC_M_DATA_SEND:
        return 1;
        break;
    default:
        return 0;
    }
}
 
 
/***********************************************************************
 * Functions that preprocess answer before sending it to the recepient.
 ***********************************************************************/
 
/** Decide if the caller (e.g. ipc_answer()) should save the old call contents
 * for answer_preprocess().
 *
 * @param call      Call structure to be decided.
 *
 * @return      Return 1 if the old call contents should be saved.
 *          Return 0 otherwise.
 */
static inline int answer_need_old(call_t *call)
{
    switch (IPC_GET_METHOD(call->data)) {
    case IPC_M_CONNECT_TO_ME:
    case IPC_M_CONNECT_ME_TO:
    case IPC_M_AS_AREA_SEND:
    case IPC_M_AS_AREA_RECV:
    case IPC_M_DATA_SEND:
        return 1;
    default:
        return 0;
    }
}
 
/** Interpret process answer as control information.
 *
 * This function is called directly after sys_ipc_answer().
 *
 * @param answer    Call structure with the answer.
 * @param olddata   Saved data of the request.
 *
 * @return      Return 0 on success or an error code.
 */
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->state == IPC_PHONE_CONNECTED) {
            list_remove(&answer->data.phone->link);
            answer->data.phone->state = IPC_PHONE_SLAMMED;
        }
        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 hash' as arg3 of response */
            IPC_SET_ARG3(answer->data,
                (unative_t) &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);
        }
    } else if (IPC_GET_METHOD(*olddata) == IPC_M_DATA_SEND) {
        if (!IPC_GET_RETVAL(answer->data)) {
            int rc;
            uintptr_t dst;
            uintptr_t size;
 
            ASSERT(answer->buffer);
 
            dst = IPC_GET_ARG1(answer->data);
            size = IPC_GET_ARG3(answer->data);
 
            rc = copy_to_uspace((void *) dst, answer->buffer, size);
            if (rc != 0)
                IPC_SET_RETVAL(answer->data, rc);
            free(answer->buffer);
            answer->buffer = NULL;
        }
    }
    return 0;
}
 
/** Called before the request is sent.
 *
 * @param call      Call structure with the request.
 *
 * @return      Return 0 on success, ELIMIT or EPERM on error.
 */
static int request_preprocess(call_t *call)
{
    int newphid;
    size_t size;
    uintptr_t src;
    int rc;
 
    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, (unative_t) &TASK->phones[newphid]);
        call->flags |= IPC_CALL_CONN_ME_TO;
        call->priv = newphid;
        break;
    case IPC_M_AS_AREA_SEND:
        size = as_area_get_size(IPC_GET_ARG1(call->data));
        if (!size)
            return EPERM;
        IPC_SET_ARG2(call->data, size);
        break;
    case IPC_M_DATA_SEND:
        src = IPC_GET_ARG2(call->data);
        size = IPC_GET_ARG3(call->data);
       
        if ((size <= 0) || (size > DATA_SEND_LIMIT))
            return ELIMIT;
       
        call->buffer = (uint8_t *) malloc(size, 0);
        rc = copy_from_uspace(call->buffer, (void *) src, size);
        if (rc != 0) {
            free(call->buffer);
            return rc;
        }
        break;
    default:
        break;
    }
    return 0;
}
 
/*******************************************************************************
 * Functions called to process received call/answer before passing it to uspace.
 *******************************************************************************/
 
/** Do basic kernel processing of received call answer.
 *
 * @param call      Call structure with the 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->priv);
        else
            IPC_SET_ARG3(call->data, call->priv);
    }
}
 
/** Do basic kernel processing of received call request.
 *
 * @param box       Destination answerbox structure.
 * @param call      Call structure with the request.
 *
 * @return      Return 0 if the call should be passed to userspace.
 *          Return -1 if the call should be ignored.
 */
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;
}
 
/** Make a fast call over IPC, wait for reply and return to user.
 *
 * This function can handle only three arguments of payload, but is faster than
 * the generic function (i.e. sys_ipc_call_sync_slow()).
 *
 * @param phoneid   Phone handle for the call.
 * @param method    Method of the call.
 * @param arg1      Service-defined payload argument.
 * @param arg2      Service-defined payload argument.
 * @param arg3      Service-defined payload argument.
 * @param data      Address of userspace structure where the reply call will
 *          be stored.
 *
 * @return      Returns 0 on success.
 *          Return ENOENT if there is no such phone handle.
 */
unative_t sys_ipc_call_sync_fast(unative_t phoneid, unative_t method,
    unative_t arg1, unative_t arg2, unative_t arg3, ipc_data_t *data)
{
    call_t call;
    phone_t *phone;
    int res;
    int rc;
 
    GET_CHECK_PHONE(phone, phoneid, return ENOENT);
 
    ipc_call_static_init(&call);
    IPC_SET_METHOD(call.data, method);
    IPC_SET_ARG1(call.data, arg1);
    IPC_SET_ARG2(call.data, arg2);
    IPC_SET_ARG3(call.data, arg3);
    /*
     * To achieve deterministic behavior, zero out arguments that are beyond
     * the limits of the fast version.
     */
    IPC_SET_ARG4(call.data, 0);
    IPC_SET_ARG5(call.data, 0);
 
    if (!(res = request_preprocess(&call))) {
        ipc_call_sync(phone, &call);
        process_answer(&call);
    } else {
        IPC_SET_RETVAL(call.data, res);
    }
    rc = STRUCT_TO_USPACE(&data->args, &call.data.args);
    if (rc != 0)
        return rc;
 
    return 0;
}
 
/** Make a synchronous IPC call allowing to transmit the entire payload.
 *
 * @param phoneid   Phone handle for the call.
 * @param question  Userspace address of call data with the request.
 * @param reply     Userspace address of call data where to store the
 *          answer.
 *
 * @return      Zero on success or an error code.
 */
unative_t sys_ipc_call_sync_slow(unative_t 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 (unative_t) 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 the allowed limit of asynchronous calls.
 *
 * @return      Return 0 if limit not reached or -1 if 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;
}
 
/** Make a fast asynchronous call over IPC.
 *
 * This function can only handle four arguments of payload, but is faster than
 * the generic function sys_ipc_call_async_slow().
 *
 * @param phoneid   Phone handle for the call.
 * @param method    Method of the call.
 * @param arg1      Service-defined payload argument.
 * @param arg2      Service-defined payload argument.
 * @param arg3      Service-defined payload argument.
 * @param arg4      Service-defined payload argument.
 *
 * @return      Return call hash on success.
 *          Return IPC_CALLRET_FATAL in case of a fatal error and
 *          IPC_CALLRET_TEMPORARY if there are too many pending
 *          asynchronous requests; answers should be handled first.
 */
unative_t sys_ipc_call_async_fast(unative_t phoneid, unative_t method,
    unative_t arg1, unative_t arg2, unative_t arg3, unative_t arg4)
{
    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);
    IPC_SET_ARG3(call->data, arg3);
    IPC_SET_ARG4(call->data, arg4);
    /*
     * To achieve deterministic behavior, zero out arguments that are beyond
     * the limits of the fast version.
     */
    IPC_SET_ARG5(call->data, 0);
 
    if (!(res = request_preprocess(call)))
        ipc_call(phone, call);
    else
        ipc_backsend_err(phone, call, res);
 
    return (unative_t) call;
}
 
/** Make an asynchronous IPC call allowing to transmit the entire payload.
 *
 * @param phoneid   Phone handle for the call.
 * @param data      Userspace address of call data with the request.
 *
 * @return      See sys_ipc_call_async_fast().
 */
unative_t sys_ipc_call_async_slow(unative_t 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 (unative_t) rc;
    }
    if (!(res = request_preprocess(call)))
        ipc_call(phone, call);
    else
        ipc_backsend_err(phone, call, res);
 
    return (unative_t) call;
}
 
/** Forward a received call to another destination.
 *
 * @param callid    Hash of the call to forward.
 * @param phoneid   Phone handle to use for forwarding.
 * @param method    New method to use for the forwarded call.
 * @param arg1      New value of the first argument for the forwarded call.
 * @param mode      Flags that specify mode of the forward operation.
 *
 * @return      Return 0 on succes, otherwise return an error code.
 *
 * In case the original method is a system method, ARG1 and ARG2 are overwritten
 * in the forwarded message with the new method and the new arg1, respectively.
 * Otherwise the METHOD and ARG1 are rewritten with the new method and arg1,
 * respectively. Also note there is a set of immutable methods, for which the
 * new method and argument is not set and these values are ignored.
 *
 * Warning: When implementing support for changing additional payload
 *      arguments, make sure that ARG3 is not rewritten for certain
 *      system IPC
 */
unative_t sys_ipc_forward_fast(unative_t callid, unative_t phoneid,
    unative_t method, unative_t arg1, int mode)
{
    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 (!method_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 the method is immutable, don't change anything.
     */
    if (!method_is_immutable(IPC_GET_METHOD(call->data))) {
        if (method_is_system(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, mode);
}
 
/** Answer an IPC call - fast version.
 *
 * This function can handle only two return arguments of payload, but is faster
 * than the generic sys_ipc_answer().
 *
 * @param callid    Hash of the call to be answered.
 * @param retval    Return value of the answer.
 * @param arg1      Service-defined return value.
 * @param arg2      Service-defined return value.
 * @param arg3      Service-defined return value.
 * @param arg4      Service-defined return value.
 *
 * @return      Return 0 on success, otherwise return an error code.   
 */
unative_t sys_ipc_answer_fast(unative_t callid, unative_t retval,
    unative_t arg1, unative_t arg2, unative_t arg3, unative_t arg4)
{
    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);
    IPC_SET_ARG3(call->data, arg3);
    IPC_SET_ARG4(call->data, arg4);
    /*
     * To achieve deterministic behavior, zero out arguments that are beyond
     * the limits of the fast version.
     */
    IPC_SET_ARG5(call->data, 0);
    rc = answer_preprocess(call, saveddata ? &saved_data : NULL);
 
    ipc_answer(&TASK->answerbox, call);
    return rc;
}
 
/** Answer an IPC call.
 *
 * @param callid    Hash of the call to be answered.
 * @param data      Userspace address of call data with the answer.
 *
 * @return      Return 0 on success, otherwise return an error code.
 */
unative_t sys_ipc_answer_slow(unative_t 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 a phone.
 *
 * @param       Phone handle of the phone to be hung up.
 *
 * @return      Return 0 on success or an error code.
 */
unative_t 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 an incoming IPC call or an answer.
 *
 * @param calldata  Pointer to buffer where the call/answer data is stored.
 * @param usec      Timeout. See waitq_sleep_timeout() for explanation.
 * @param flags     Select mode of sleep operation. See waitq_sleep_timeout()
 *          for explanation.
 *
 * @return      Hash of the call.
 *          If IPC_CALLID_NOTIFICATION bit is set in the hash, the
 *          call is a notification. IPC_CALLID_ANSWERED denotes an
 *          answer.
 */
unative_t sys_ipc_wait_for_call(ipc_data_t *calldata, uint32_t usec, int flags)
{
    call_t *call;
 
restart:   
    call = ipc_wait_for_call(&TASK->answerbox, usec,
        flags | SYNCH_FLAGS_INTERRUPTIBLE);
    if (!call)
        return 0;
 
    if (call->flags & IPC_CALL_NOTIF) {
        ASSERT(! (call->flags & IPC_CALL_STATIC_ALLOC));
 
        /* Set in_phone_hash to the interrupt counter */
        call->data.phone = (void *) call->priv;
       
        STRUCT_TO_USPACE(calldata, &call->data);
 
        ipc_call_free(call);
       
        return ((unative_t) 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 ((unative_t) 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 (unative_t)call;
}
 
/** Connect an IRQ handler to a task.
 *
 * @param inr       IRQ number.
 * @param devno     Device number.
 * @param method    Method to be associated with the notification.
 * @param ucode     Uspace pointer to the top-half pseudocode.
 *
 * @return      EPERM or a return code returned by ipc_irq_register().
 */
unative_t sys_ipc_register_irq(inr_t inr, devno_t devno, unative_t method,
    irq_code_t *ucode)
{
    if (!(cap_get(TASK) & CAP_IRQ_REG))
        return EPERM;
 
    return ipc_irq_register(&TASK->answerbox, inr, devno, method, ucode);
}
 
/** Disconnect an IRQ handler from a task.
 *
 * @param inr       IRQ number.
 * @param devno     Device number.
 *
 * @return      Zero on success or EPERM on error..
 */
unative_t sys_ipc_unregister_irq(inr_t inr, devno_t devno)
{
    if (!(cap_get(TASK) & CAP_IRQ_REG))
        return EPERM;
 
    ipc_irq_unregister(&TASK->answerbox, inr, devno);
 
    return 0;
}
 
/** @}
 */
 

Rev 2620	Rev 2622
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	29	/** @addtogroup genericipc
30	* @{	30	* @{
31	*/	31	*/
32	/** @file	32	/** @file
33	*/	33	*/
34		34
35	#include <arch.h>	35	#include <arch.h>
36	#include <proc/task.h>	36	#include <proc/task.h>
37	#include <proc/thread.h>	37	#include <proc/thread.h>
38	#include <errno.h>	38	#include <errno.h>
39	#include <memstr.h>	39	#include <memstr.h>
40	#include <debug.h>	40	#include <debug.h>
41	#include <ipc/ipc.h>	41	#include <ipc/ipc.h>
42	#include <ipc/sysipc.h>	42	#include <ipc/sysipc.h>
43	#include <ipc/irq.h>	43	#include <ipc/irq.h>
44	#include <ipc/ipcrsc.h>	44	#include <ipc/ipcrsc.h>
45	#include <arch/interrupt.h>	45	#include <arch/interrupt.h>
46	#include <print.h>	46	#include <print.h>
47	#include <syscall/copy.h>	47	#include <syscall/copy.h>
48	#include <security/cap.h>	48	#include <security/cap.h>
49	#include <mm/as.h>	49	#include <mm/as.h>
50	#include <print.h>	50	#include <print.h>
51		51
52	/** Maximum buffer size allowed for IPC_M_DATA_SEND requests. */	52	/** Maximum buffer size allowed for IPC_M_DATA_SEND requests. */
53	#define DATA_SEND_LIMIT (64 * 1024)	53	#define DATA_SEND_LIMIT (64 * 1024)
54		54
55	#define GET_CHECK_PHONE(phone, phoneid, err) \	55	#define GET_CHECK_PHONE(phone, phoneid, err) \
56	{ \	56	{ \
57	if (phoneid > IPC_MAX_PHONES) { \	57	if (phoneid > IPC_MAX_PHONES) { \
58	err; \	58	err; \
59	} \	59	} \
60	phone = &TASK->phones[phoneid]; \	60	phone = &TASK->phones[phoneid]; \
61	}	61	}
62		62
63	#define STRUCT_TO_USPACE(dst, src) copy_to_uspace(dst, src, sizeof(*(src)))	63	#define STRUCT_TO_USPACE(dst, src) copy_to_uspace(dst, src, sizeof(*(src)))
64		64
65	/** Decide if the method is a system method.	65	/** Decide if the method is a system method.
66	*	66	*
67	* @param method Method to be decided.	67	* @param method Method to be decided.
68	*	68	*
69	* @return Return 1 if the method is a system method.	69	* @return Return 1 if the method is a system method.
70	* Otherwise return 0.	70	* Otherwise return 0.
71	*/	71	*/
72	static inline int method_is_system(unative_t method)	72	static inline int method_is_system(unative_t method)
73	{	73	{
74	if (method <= IPC_M_LAST_SYSTEM)	74	if (method <= IPC_M_LAST_SYSTEM)
75	return 1;	75	return 1;
76	return 0;	76	return 0;
77	}	77	}
78		78
79	/** Decide if the message with this method is forwardable.	79	/** Decide if the message with this method is forwardable.
80	*	80	*
81	* - some system messages may be forwarded, for some of them	81	* - some system messages may be forwarded, for some of them
82	* it is useless	82	* it is useless
83	*	83	*
84	* @param method Method to be decided.	84	* @param method Method to be decided.
85	*	85	*
86	* @return Return 1 if the method is forwardable.	86	* @return Return 1 if the method is forwardable.
87	* Otherwise return 0.	87	* Otherwise return 0.
88	*/	88	*/
89	static inline int method_is_forwardable(unative_t method)	89	static inline int method_is_forwardable(unative_t method)
90	{	90	{
91	switch (method) {	91	switch (method) {
92	case IPC_M_PHONE_HUNGUP:	92	case IPC_M_PHONE_HUNGUP:
93	/* This message is meant only for the original recipient. */	93	/* This message is meant only for the original recipient. */
94	return 0;	94	return 0;
95	default:	95	default:
96	return 1;	96	return 1;
97	}	97	}
98	}	98	}
99		99
100	/** Decide if the message with this method is immutable on forward.	100	/** Decide if the message with this method is immutable on forward.
101	*	101	*
102	* - some system messages may be forwarded but their content cannot be altered	102	* - some system messages may be forwarded but their content cannot be altered
103	*	103	*
104	* @param method Method to be decided.	104	* @param method Method to be decided.
105	*	105	*
106	* @return Return 1 if the method is immutable on forward.	106	* @return Return 1 if the method is immutable on forward.
107	* Otherwise return 0.	107	* Otherwise return 0.
108	*/	108	*/
109	static inline int method_is_immutable(unative_t method)	109	static inline int method_is_immutable(unative_t method)
110	{	110	{
111	switch (method) {	111	switch (method) {
112	case IPC_M_AS_AREA_SEND:	112	case IPC_M_AS_AREA_SEND:
113	case IPC_M_AS_AREA_RECV:	113	case IPC_M_AS_AREA_RECV:
114	case IPC_M_DATA_SEND:	114	case IPC_M_DATA_SEND:
115	return 1;	115	return 1;
116	break;	116	break;
117	default:	117	default:
118	return 0;	118	return 0;
119	}	119	}
120	}	120	}
121		121
122		122
123	/***********************************************************************	123	/***********************************************************************
124	* Functions that preprocess answer before sending it to the recepient.	124	* Functions that preprocess answer before sending it to the recepient.
125	***********************************************************************/	125	***********************************************************************/
126		126
127	/** Decide if the caller (e.g. ipc_answer()) should save the old call contents	127	/** Decide if the caller (e.g. ipc_answer()) should save the old call contents
128	* for answer_preprocess().	128	* for answer_preprocess().
129	*	129	*
130	* @param call Call structure to be decided.	130	* @param call Call structure to be decided.
131	*	131	*
132	* @return Return 1 if the old call contents should be saved.	132	* @return Return 1 if the old call contents should be saved.
133	* Return 0 otherwise.	133	* Return 0 otherwise.
134	*/	134	*/
135	static inline int answer_need_old(call_t *call)	135	static inline int answer_need_old(call_t *call)
136	{	136	{
137	switch (IPC_GET_METHOD(call->data)) {	137	switch (IPC_GET_METHOD(call->data)) {
138	case IPC_M_CONNECT_TO_ME:	138	case IPC_M_CONNECT_TO_ME:
139	case IPC_M_CONNECT_ME_TO:	139	case IPC_M_CONNECT_ME_TO:
140	case IPC_M_AS_AREA_SEND:	140	case IPC_M_AS_AREA_SEND:
141	case IPC_M_AS_AREA_RECV:	141	case IPC_M_AS_AREA_RECV:
142	case IPC_M_DATA_SEND:	142	case IPC_M_DATA_SEND:
143	return 1;	143	return 1;
144	default:	144	default:
145	return 0;	145	return 0;
146	}	146	}
147	}	147	}
148		148
149	/** Interpret process answer as control information.	149	/** Interpret process answer as control information.
150	*	150	*
151	* This function is called directly after sys_ipc_answer().	151	* This function is called directly after sys_ipc_answer().
152	*	152	*
153	* @param answer Call structure with the answer.	153	* @param answer Call structure with the answer.
154	* @param olddata Saved data of the request.	154	* @param olddata Saved data of the request.
155	*	155	*
156	* @return Return 0 on success or an error code.	156	* @return Return 0 on success or an error code.
157	*/	157	*/
158	static inline int answer_preprocess(call_t answer, ipc_data_t olddata)	158	static inline int answer_preprocess(call_t answer, ipc_data_t olddata)
159	{	159	{
160	int phoneid;	160	int phoneid;
161		161
162	if (IPC_GET_RETVAL(answer->data) == EHANGUP) {	162	if (IPC_GET_RETVAL(answer->data) == EHANGUP) {
163	/* In case of forward, hangup the forwared phone,	163	/* In case of forward, hangup the forwared phone,
164	* not the originator	164	* not the originator
165	*/	165	*/
166	spinlock_lock(&answer->data.phone->lock);	166	spinlock_lock(&answer->data.phone->lock);
167	spinlock_lock(&TASK->answerbox.lock);	167	spinlock_lock(&TASK->answerbox.lock);
168	if (answer->data.phone->state == IPC_PHONE_CONNECTED) {	168	if (answer->data.phone->state == IPC_PHONE_CONNECTED) {
169	list_remove(&answer->data.phone->link);	169	list_remove(&answer->data.phone->link);
170	answer->data.phone->state = IPC_PHONE_SLAMMED;	170	answer->data.phone->state = IPC_PHONE_SLAMMED;
171	}	171	}
172	spinlock_unlock(&TASK->answerbox.lock);	172	spinlock_unlock(&TASK->answerbox.lock);
173	spinlock_unlock(&answer->data.phone->lock);	173	spinlock_unlock(&answer->data.phone->lock);
174	}	174	}
175		175
176	if (!olddata)	176	if (!olddata)
177	return 0;	177	return 0;
178		178
179	if (IPC_GET_METHOD(*olddata) == IPC_M_CONNECT_TO_ME) {	179	if (IPC_GET_METHOD(*olddata) == IPC_M_CONNECT_TO_ME) {
180	phoneid = IPC_GET_ARG3(*olddata);	180	phoneid = IPC_GET_ARG3(*olddata);
181	if (IPC_GET_RETVAL(answer->data)) {	181	if (IPC_GET_RETVAL(answer->data)) {
182	/* The connection was not accepted */	182	/* The connection was not accepted */
183	phone_dealloc(phoneid);	183	phone_dealloc(phoneid);
184	} else {	184	} else {
185	/* The connection was accepted */	185	/* The connection was accepted */
186	phone_connect(phoneid, &answer->sender->answerbox);	186	phone_connect(phoneid, &answer->sender->answerbox);
187	/* Set 'phone hash' as arg3 of response */	187	/* Set 'phone hash' as arg3 of response */
188	IPC_SET_ARG3(answer->data,	188	IPC_SET_ARG3(answer->data,
189	(unative_t) &TASK->phones[phoneid]);	189	(unative_t) &TASK->phones[phoneid]);
190	}	190	}
191	} else if (IPC_GET_METHOD(*olddata) == IPC_M_CONNECT_ME_TO) {	191	} else if (IPC_GET_METHOD(*olddata) == IPC_M_CONNECT_ME_TO) {
192	/* If the users accepted call, connect */	192	/* If the users accepted call, connect */
193	if (!IPC_GET_RETVAL(answer->data)) {	193	if (!IPC_GET_RETVAL(answer->data)) {
194	ipc_phone_connect((phone_t ) IPC_GET_ARG3(olddata),	194	ipc_phone_connect((phone_t ) IPC_GET_ARG3(olddata),
195	&TASK->answerbox);	195	&TASK->answerbox);
196	}	196	}
197	} else if (IPC_GET_METHOD(*olddata) == IPC_M_AS_AREA_SEND) {	197	} else if (IPC_GET_METHOD(*olddata) == IPC_M_AS_AREA_SEND) {
198	if (!IPC_GET_RETVAL(answer->data)) {	198	if (!IPC_GET_RETVAL(answer->data)) {
199	/* Accepted, handle as_area receipt */	199	/* Accepted, handle as_area receipt */
200	ipl_t ipl;	200	ipl_t ipl;
201	int rc;	201	int rc;
202	as_t *as;	202	as_t *as;
203		203
204	ipl = interrupts_disable();	204	ipl = interrupts_disable();
205	spinlock_lock(&answer->sender->lock);	205	spinlock_lock(&answer->sender->lock);
206	as = answer->sender->as;	206	as = answer->sender->as;
207	spinlock_unlock(&answer->sender->lock);	207	spinlock_unlock(&answer->sender->lock);
208	interrupts_restore(ipl);	208	interrupts_restore(ipl);
209		209
210	rc = as_area_share(as, IPC_GET_ARG1(*olddata),	210	rc = as_area_share(as, IPC_GET_ARG1(*olddata),
211	IPC_GET_ARG2(*olddata), AS,	211	IPC_GET_ARG2(*olddata), AS,
212	IPC_GET_ARG1(answer->data), IPC_GET_ARG3(*olddata));	212	IPC_GET_ARG1(answer->data), IPC_GET_ARG3(*olddata));
213	IPC_SET_RETVAL(answer->data, rc);	213	IPC_SET_RETVAL(answer->data, rc);
214	return rc;	214	return rc;
215	}	215	}
216	} else if (IPC_GET_METHOD(*olddata) == IPC_M_AS_AREA_RECV) {	216	} else if (IPC_GET_METHOD(*olddata) == IPC_M_AS_AREA_RECV) {
217	if (!IPC_GET_RETVAL(answer->data)) {	217	if (!IPC_GET_RETVAL(answer->data)) {
218	ipl_t ipl;	218	ipl_t ipl;
219	as_t *as;	219	as_t *as;
220	int rc;	220	int rc;
221		221
222	ipl = interrupts_disable();	222	ipl = interrupts_disable();
223	spinlock_lock(&answer->sender->lock);	223	spinlock_lock(&answer->sender->lock);
224	as = answer->sender->as;	224	as = answer->sender->as;
225	spinlock_unlock(&answer->sender->lock);	225	spinlock_unlock(&answer->sender->lock);
226	interrupts_restore(ipl);	226	interrupts_restore(ipl);
227		227
228	rc = as_area_share(AS, IPC_GET_ARG1(answer->data),	228	rc = as_area_share(AS, IPC_GET_ARG1(answer->data),
229	IPC_GET_ARG2(olddata), as, IPC_GET_ARG1(olddata),	229	IPC_GET_ARG2(olddata), as, IPC_GET_ARG1(olddata),
230	IPC_GET_ARG2(answer->data));	230	IPC_GET_ARG2(answer->data));
231	IPC_SET_RETVAL(answer->data, rc);	231	IPC_SET_RETVAL(answer->data, rc);
232	}	232	}
233	} else if (IPC_GET_METHOD(*olddata) == IPC_M_DATA_SEND) {	233	} else if (IPC_GET_METHOD(*olddata) == IPC_M_DATA_SEND) {
234	if (!IPC_GET_RETVAL(answer->data)) {	234	if (!IPC_GET_RETVAL(answer->data)) {
235	int rc;	235	int rc;
236	uintptr_t dst;	236	uintptr_t dst;
237	uintptr_t size;	237	uintptr_t size;
238		238
239	ASSERT(answer->buffer);	239	ASSERT(answer->buffer);
240		240
241	dst = IPC_GET_ARG1(answer->data);	241	dst = IPC_GET_ARG1(answer->data);
242	size = IPC_GET_ARG3(answer->data);	242	size = IPC_GET_ARG3(answer->data);
243		243
244	rc = copy_to_uspace((void *) dst, answer->buffer, size);	244	rc = copy_to_uspace((void *) dst, answer->buffer, size);
245	if (rc != 0)	245	if (rc != 0)
246	IPC_SET_RETVAL(answer->data, rc);	246	IPC_SET_RETVAL(answer->data, rc);
247	free(answer->buffer);	247	free(answer->buffer);
248	answer->buffer = NULL;	248	answer->buffer = NULL;
249	}	249	}
250	}	250	}
251	return 0;	251	return 0;
252	}	252	}
253		253
254	/** Called before the request is sent.	254	/** Called before the request is sent.
255	*	255	*
256	* @param call Call structure with the request.	256	* @param call Call structure with the request.
257	*	257	*
258	* @return Return 0 on success, ELIMIT or EPERM on error.	258	* @return Return 0 on success, ELIMIT or EPERM on error.
259	*/	259	*/
260	static int request_preprocess(call_t *call)	260	static int request_preprocess(call_t *call)
261	{	261	{
262	int newphid;	262	int newphid;
263	size_t size;	263	size_t size;
264	uintptr_t src;	264	uintptr_t src;
265	int rc;	265	int rc;
266		266
267	switch (IPC_GET_METHOD(call->data)) {	267	switch (IPC_GET_METHOD(call->data)) {
268	case IPC_M_CONNECT_ME_TO:	268	case IPC_M_CONNECT_ME_TO:
269	newphid = phone_alloc();	269	newphid = phone_alloc();
270	if (newphid < 0)	270	if (newphid < 0)
271	return ELIMIT;	271	return ELIMIT;
272	/* Set arg3 for server */	272	/* Set arg3 for server */
273	IPC_SET_ARG3(call->data, (unative_t) &TASK->phones[newphid]);	273	IPC_SET_ARG3(call->data, (unative_t) &TASK->phones[newphid]);
274	call->flags \|= IPC_CALL_CONN_ME_TO;	274	call->flags \|= IPC_CALL_CONN_ME_TO;
275	call->priv = newphid;	275	call->priv = newphid;
276	break;	276	break;
277	case IPC_M_AS_AREA_SEND:	277	case IPC_M_AS_AREA_SEND:
278	size = as_area_get_size(IPC_GET_ARG1(call->data));	278	size = as_area_get_size(IPC_GET_ARG1(call->data));
279	if (!size)	279	if (!size)
280	return EPERM;	280	return EPERM;
281	IPC_SET_ARG2(call->data, size);	281	IPC_SET_ARG2(call->data, size);
282	break;	282	break;
283	case IPC_M_DATA_SEND:	283	case IPC_M_DATA_SEND:
284	src = IPC_GET_ARG2(call->data);	284	src = IPC_GET_ARG2(call->data);
285	size = IPC_GET_ARG3(call->data);	285	size = IPC_GET_ARG3(call->data);
286		286
287	if ((size <= 0) \|\| (size > DATA_SEND_LIMIT))	287	if ((size <= 0) \|\| (size > DATA_SEND_LIMIT))
288	return ELIMIT;	288	return ELIMIT;
289		289
290	call->buffer = (uint8_t *) malloc(size, 0);	290	call->buffer = (uint8_t *) malloc(size, 0);
291	rc = copy_from_uspace(call->buffer, (void *) src, size);	291	rc = copy_from_uspace(call->buffer, (void *) src, size);
292	if (rc != 0) {	292	if (rc != 0) {
293	free(call->buffer);	293	free(call->buffer);
294	return rc;	294	return rc;
295	}	295	}
296	break;	296	break;
297	default:	297	default:
298	break;	298	break;
299	}	299	}
300	return 0;	300	return 0;
301	}	301	}
302		302
303	/*******************************************************************************	303	/*******************************************************************************
304	* Functions called to process received call/answer before passing it to uspace.	304	* Functions called to process received call/answer before passing it to uspace.
305	*******************************************************************************/	305	*******************************************************************************/
306		306
307	/** Do basic kernel processing of received call answer.	307	/** Do basic kernel processing of received call answer.
308	*	308	*
309	* @param call Call structure with the answer.	309	* @param call Call structure with the answer.
310	*/	310	*/
311	static void process_answer(call_t *call)	311	static void process_answer(call_t *call)
312	{	312	{
313	if (IPC_GET_RETVAL(call->data) == EHANGUP &&	313	if (IPC_GET_RETVAL(call->data) == EHANGUP &&
314	(call->flags & IPC_CALL_FORWARDED))	314	(call->flags & IPC_CALL_FORWARDED))
315	IPC_SET_RETVAL(call->data, EFORWARD);	315	IPC_SET_RETVAL(call->data, EFORWARD);
316		316
317	if (call->flags & IPC_CALL_CONN_ME_TO) {	317	if (call->flags & IPC_CALL_CONN_ME_TO) {
318	if (IPC_GET_RETVAL(call->data))	318	if (IPC_GET_RETVAL(call->data))
319	phone_dealloc(call->priv);	319	phone_dealloc(call->priv);
320	else	320	else
321	IPC_SET_ARG3(call->data, call->priv);	321	IPC_SET_ARG3(call->data, call->priv);
322	}	322	}
323	}	323	}
324		324
325	/** Do basic kernel processing of received call request.	325	/** Do basic kernel processing of received call request.
326	*	326	*
327	* @param box Destination answerbox structure.	327	* @param box Destination answerbox structure.
328	* @param call Call structure with the request.	328	* @param call Call structure with the request.
329	*	329	*
330	* @return Return 0 if the call should be passed to userspace.	330	* @return Return 0 if the call should be passed to userspace.
331	* Return -1 if the call should be ignored.	331	* Return -1 if the call should be ignored.
332	*/	332	*/
333	static int process_request(answerbox_t box, call_t call)	333	static int process_request(answerbox_t box, call_t call)
334	{	334	{
335	int phoneid;	335	int phoneid;
336		336
337	if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_TO_ME) {	337	if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_TO_ME) {
338	phoneid = phone_alloc();	338	phoneid = phone_alloc();
339	if (phoneid < 0) { /* Failed to allocate phone */	339	if (phoneid < 0) { /* Failed to allocate phone */
340	IPC_SET_RETVAL(call->data, ELIMIT);	340	IPC_SET_RETVAL(call->data, ELIMIT);
341	ipc_answer(box, call);	341	ipc_answer(box, call);
342	return -1;	342	return -1;
343	}	343	}
344	IPC_SET_ARG3(call->data, phoneid);	344	IPC_SET_ARG3(call->data, phoneid);
345	}	345	}
346	return 0;	346	return 0;
347	}	347	}
348		348
349	/** Make a fast call over IPC, wait for reply and return to user.	349	/** Make a fast call over IPC, wait for reply and return to user.
350	*	350	*
351	* This function can handle only three arguments of payload, but is faster than	351	* This function can handle only three arguments of payload, but is faster than
352	* the generic function (i.e. sys_ipc_call_sync_slow()).	352	* the generic function (i.e. sys_ipc_call_sync_slow()).
353	*	353	*
354	* @param phoneid Phone handle for the call.	354	* @param phoneid Phone handle for the call.
355	* @param method Method of the call.	355	* @param method Method of the call.
356	* @param arg1 Service-defined payload argument.	356	* @param arg1 Service-defined payload argument.
357	* @param arg2 Service-defined payload argument.	357	* @param arg2 Service-defined payload argument.
358	* @param arg3 Service-defined payload argument.	358	* @param arg3 Service-defined payload argument.
359	* @param data Address of userspace structure where the reply call will	359	* @param data Address of userspace structure where the reply call will
360	* be stored.	360	* be stored.
361	*	361	*
362	* @return Returns 0 on success.	362	* @return Returns 0 on success.
363	* Return ENOENT if there is no such phone handle.	363	* Return ENOENT if there is no such phone handle.
364	*/	364	*/
365	unative_t sys_ipc_call_sync_fast(unative_t phoneid, unative_t method,	365	unative_t sys_ipc_call_sync_fast(unative_t phoneid, unative_t method,
366	unative_t arg1, unative_t arg2, unative_t arg3, ipc_data_t *data)	366	unative_t arg1, unative_t arg2, unative_t arg3, ipc_data_t *data)
367	{	367	{
368	call_t call;	368	call_t call;
369	phone_t *phone;	369	phone_t *phone;
370	int res;	370	int res;
371	int rc;	371	int rc;
372		372
373	GET_CHECK_PHONE(phone, phoneid, return ENOENT);	373	GET_CHECK_PHONE(phone, phoneid, return ENOENT);
374		374
375	ipc_call_static_init(&call);	375	ipc_call_static_init(&call);
376	IPC_SET_METHOD(call.data, method);	376	IPC_SET_METHOD(call.data, method);
377	IPC_SET_ARG1(call.data, arg1);	377	IPC_SET_ARG1(call.data, arg1);
378	IPC_SET_ARG2(call.data, arg2);	378	IPC_SET_ARG2(call.data, arg2);
379	IPC_SET_ARG3(call.data, arg3);	379	IPC_SET_ARG3(call.data, arg3);
380	/*	380	/*
381	* To achieve deterministic behavior, zero out arguments that are beyond	381	* To achieve deterministic behavior, zero out arguments that are beyond
382	* the limits of the fast version.	382	* the limits of the fast version.
383	*/	383	*/
384	IPC_SET_ARG4(call.data, 0);	384	IPC_SET_ARG4(call.data, 0);
385	IPC_SET_ARG5(call.data, 0);	385	IPC_SET_ARG5(call.data, 0);
386		386
387	if (!(res = request_preprocess(&call))) {	387	if (!(res = request_preprocess(&call))) {
388	ipc_call_sync(phone, &call);	388	ipc_call_sync(phone, &call);
389	process_answer(&call);	389	process_answer(&call);
390	} else {	390	} else {
391	IPC_SET_RETVAL(call.data, res);	391	IPC_SET_RETVAL(call.data, res);
392	}	392	}
393	rc = STRUCT_TO_USPACE(&data->args, &call.data.args);	393	rc = STRUCT_TO_USPACE(&data->args, &call.data.args);
394	if (rc != 0)	394	if (rc != 0)
395	return rc;	395	return rc;
396		396
397	return 0;	397	return 0;
398	}	398	}
399		399
400	/** Make a synchronous IPC call allowing to transmit the entire payload.	400	/** Make a synchronous IPC call allowing to transmit the entire payload.
401	*	401	*
402	* @param phoneid Phone handle for the call.	402	* @param phoneid Phone handle for the call.
403	* @param question Userspace address of call data with the request.	403	* @param question Userspace address of call data with the request.
404	* @param reply Userspace address of call data where to store the	404	* @param reply Userspace address of call data where to store the
405	* answer.	405	* answer.
406	*	406	*
407	* @return Zero on success or an error code.	407	* @return Zero on success or an error code.
408	*/	408	*/
409	unative_t sys_ipc_call_sync_slow(unative_t phoneid, ipc_data_t *question,	409	unative_t sys_ipc_call_sync_slow(unative_t phoneid, ipc_data_t *question,
410	ipc_data_t *reply)	410	ipc_data_t *reply)
411	{	411	{
412	call_t call;	412	call_t call;
413	phone_t *phone;	413	phone_t *phone;
414	int res;	414	int res;
415	int rc;	415	int rc;
416		416
417	ipc_call_static_init(&call);	417	ipc_call_static_init(&call);
418	rc = copy_from_uspace(&call.data.args, &question->args,	418	rc = copy_from_uspace(&call.data.args, &question->args,
419	sizeof(call.data.args));	419	sizeof(call.data.args));
420	if (rc != 0)	420	if (rc != 0)
421	return (unative_t) rc;	421	return (unative_t) rc;
422		422
423	GET_CHECK_PHONE(phone, phoneid, return ENOENT);	423	GET_CHECK_PHONE(phone, phoneid, return ENOENT);
424		424
425	if (!(res = request_preprocess(&call))) {	425	if (!(res = request_preprocess(&call))) {
426	ipc_call_sync(phone, &call);	426	ipc_call_sync(phone, &call);
427	process_answer(&call);	427	process_answer(&call);
428	} else	428	} else
429	IPC_SET_RETVAL(call.data, res);	429	IPC_SET_RETVAL(call.data, res);
430		430
431	rc = STRUCT_TO_USPACE(&reply->args, &call.data.args);	431	rc = STRUCT_TO_USPACE(&reply->args, &call.data.args);
432	if (rc != 0)	432	if (rc != 0)
433	return rc;	433	return rc;
434		434
435	return 0;	435	return 0;
436	}	436	}
437		437
438	/** Check that the task did not exceed the allowed limit of asynchronous calls.	438	/** Check that the task did not exceed the allowed limit of asynchronous calls.
439	*	439	*
440	* @return Return 0 if limit not reached or -1 if limit exceeded.	440	* @return Return 0 if limit not reached or -1 if limit exceeded.
441	*/	441	*/
442	static int check_call_limit(void)	442	static int check_call_limit(void)
443	{	443	{
444	if (atomic_preinc(&TASK->active_calls) > IPC_MAX_ASYNC_CALLS) {	444	if (atomic_preinc(&TASK->active_calls) > IPC_MAX_ASYNC_CALLS) {
445	atomic_dec(&TASK->active_calls);	445	atomic_dec(&TASK->active_calls);
446	return -1;	446	return -1;
447	}	447	}
448	return 0;	448	return 0;
449	}	449	}
450		450
451	/** Make a fast asynchronous call over IPC.	451	/** Make a fast asynchronous call over IPC.
452	*	452	*
453	* This function can only handle four arguments of payload, but is faster than	453	* This function can only handle four arguments of payload, but is faster than
454	* the generic function sys_ipc_call_async_slow().	454	* the generic function sys_ipc_call_async_slow().
455	*	455	*
456	* @param phoneid Phone handle for the call.	456	* @param phoneid Phone handle for the call.
457	* @param method Method of the call.	457	* @param method Method of the call.
458	* @param arg1 Service-defined payload argument.	458	* @param arg1 Service-defined payload argument.
459	* @param arg2 Service-defined payload argument.	459	* @param arg2 Service-defined payload argument.
460	* @param arg3 Service-defined payload argument.	460	* @param arg3 Service-defined payload argument.
461	* @param arg4 Service-defined payload argument.	461	* @param arg4 Service-defined payload argument.
462	*	462	*
463	* @return Return call hash on success.	463	* @return Return call hash on success.
464	* Return IPC_CALLRET_FATAL in case of a fatal error and	464	* Return IPC_CALLRET_FATAL in case of a fatal error and
465	* IPC_CALLRET_TEMPORARY if there are too many pending	465	* IPC_CALLRET_TEMPORARY if there are too many pending
466	* asynchronous requests; answers should be handled first.	466	* asynchronous requests; answers should be handled first.
467	*/	467	*/
468	unative_t sys_ipc_call_async_fast(unative_t phoneid, unative_t method,	468	unative_t sys_ipc_call_async_fast(unative_t phoneid, unative_t method,
469	unative_t arg1, unative_t arg2, unative_t arg3, unative_t arg4)	469	unative_t arg1, unative_t arg2, unative_t arg3, unative_t arg4)
470	{	470	{
471	call_t *call;	471	call_t *call;
472	phone_t *phone;	472	phone_t *phone;
473	int res;	473	int res;
474		474
475	if (check_call_limit())	475	if (check_call_limit())
476	return IPC_CALLRET_TEMPORARY;	476	return IPC_CALLRET_TEMPORARY;
477		477
478	GET_CHECK_PHONE(phone, phoneid, return IPC_CALLRET_FATAL);	478	GET_CHECK_PHONE(phone, phoneid, return IPC_CALLRET_FATAL);
479		479
480	call = ipc_call_alloc(0);	480	call = ipc_call_alloc(0);
481	IPC_SET_METHOD(call->data, method);	481	IPC_SET_METHOD(call->data, method);
482	IPC_SET_ARG1(call->data, arg1);	482	IPC_SET_ARG1(call->data, arg1);
483	IPC_SET_ARG2(call->data, arg2);	483	IPC_SET_ARG2(call->data, arg2);
484	IPC_SET_ARG3(call->data, arg3);	484	IPC_SET_ARG3(call->data, arg3);
485	IPC_SET_ARG4(call->data, arg4);	485	IPC_SET_ARG4(call->data, arg4);
486	/*	486	/*
487	* To achieve deterministic behavior, zero out arguments that are beyond	487	* To achieve deterministic behavior, zero out arguments that are beyond
488	* the limits of the fast version.	488	* the limits of the fast version.
489	*/	489	*/
490	IPC_SET_ARG5(call->data, 0);	490	IPC_SET_ARG5(call->data, 0);
491		491
492	if (!(res = request_preprocess(call)))	492	if (!(res = request_preprocess(call)))
493	ipc_call(phone, call);	493	ipc_call(phone, call);
494	else	494	else
495	ipc_backsend_err(phone, call, res);	495	ipc_backsend_err(phone, call, res);
496		496
497	return (unative_t) call;	497	return (unative_t) call;
498	}	498	}
499		499
500	/** Make an asynchronous IPC call allowing to transmit the entire payload.	500	/** Make an asynchronous IPC call allowing to transmit the entire payload.

Subversion Repositories HelenOS

(root)/trunk/kernel/generic/src/ipc/sysipc.c @ 2071 – Rev 2620 → 2622