WebSVN – HelenOS – Diff – /branches/dd/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 <ipc/kbox.h>
#include <udebug/udebug_ipc.h>
#include <arch/interrupt.h>
 
#include <syscall/copy.h>
#include <security/cap.h>
#include <mm/as.h>
#include <print.h>
 
/**
 * Maximum buffer size allowed for IPC_M_DATA_WRITE and IPC_M_DATA_READ
 * requests.
 */
#define DATA_XFER_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_SHARE_OUT:
    case IPC_M_SHARE_IN:
    case IPC_M_DATA_WRITE:
    case IPC_M_DATA_READ:
        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_SHARE_OUT:
    case IPC_M_SHARE_IN:
    case IPC_M_DATA_WRITE:
    case IPC_M_DATA_READ:
        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 ((native_t) IPC_GET_RETVAL(answer->data) == EHANGUP) {
        /* In case of forward, hangup the forwared phone,
         * not the originator
         */
        mutex_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);
        mutex_unlock(&answer->data.phone->lock);
    }
 
    if (!olddata)
        return 0;
 
    if (IPC_GET_METHOD(*olddata) == IPC_M_CONNECT_TO_ME) {
        phoneid = IPC_GET_ARG5(*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 arg5 of response */
            IPC_SET_ARG5(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_ARG5(*olddata),
                &TASK->answerbox);
        }
    } else if (IPC_GET_METHOD(*olddata) == IPC_M_SHARE_OUT) {
        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_SHARE_IN) {
        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_READ) {
        ASSERT(!answer->buffer);
        if (!IPC_GET_RETVAL(answer->data)) {
            /* The recipient agreed to send data. */
            uintptr_t src = IPC_GET_ARG1(answer->data);
            uintptr_t dst = IPC_GET_ARG1(*olddata);
            size_t max_size = IPC_GET_ARG2(*olddata);
            size_t size = IPC_GET_ARG2(answer->data);
            if (size && size <= max_size) {
                /*
                 * Copy the destination VA so that this piece of
                 * information is not lost.
                 */
                IPC_SET_ARG1(answer->data, dst);
 
                answer->buffer = malloc(size, 0);
                int rc = copy_from_uspace(answer->buffer,
                    (void *) src, size);
                if (rc) {
                    IPC_SET_RETVAL(answer->data, rc);
                    free(answer->buffer);
                    answer->buffer = NULL;
                }
            } else if (!size) {
                IPC_SET_RETVAL(answer->data, EOK);
            } else {
                IPC_SET_RETVAL(answer->data, ELIMIT);
            }
        }
    } else if (IPC_GET_METHOD(*olddata) == IPC_M_DATA_WRITE) {
        ASSERT(answer->buffer);
        if (!IPC_GET_RETVAL(answer->data)) {
            /* The recipient agreed to receive data. */
            int rc;
            uintptr_t dst;
            size_t size;
            size_t max_size;
 
            dst = (uintptr_t)IPC_GET_ARG1(answer->data);
            size = (size_t)IPC_GET_ARG2(answer->data);
            max_size = (size_t)IPC_GET_ARG2(*olddata);
 
            if (size <= max_size) {
                rc = copy_to_uspace((void *) dst,
                    answer->buffer, size);
                if (rc)
                    IPC_SET_RETVAL(answer->data, rc);
            } else {
                IPC_SET_RETVAL(answer->data, ELIMIT);
            }
        }
        free(answer->buffer);
        answer->buffer = NULL;
    }
    return 0;
}
 
/** Called before the request is sent.
 *
 * @param call      Call structure with the request.
 * @param phone     Phone that the call will be sent through.
 *
 * @return      Return 0 on success, ELIMIT or EPERM on error.
 */
static int request_preprocess(call_t *call, phone_t *phone)
{
    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 arg5 for server */
        IPC_SET_ARG5(call->data, (unative_t) &TASK->phones[newphid]);
        call->flags |= IPC_CALL_CONN_ME_TO;
        call->priv = newphid;
        break;
    case IPC_M_SHARE_OUT:
        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_READ:
        size = IPC_GET_ARG2(call->data);
        if ((size <= 0 || (size > DATA_XFER_LIMIT)))
            return ELIMIT;
        break;
    case IPC_M_DATA_WRITE:
        src = IPC_GET_ARG1(call->data);
        size = IPC_GET_ARG2(call->data);
       
        if ((size <= 0) || (size > DATA_XFER_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;
#ifdef CONFIG_UDEBUG
    case IPC_M_DEBUG_ALL:
        return udebug_request_preprocess(call, phone);
#endif
    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 (((native_t) 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_ARG5(call->data, call->priv);
    }
 
    if (call->buffer) {
        /* This must be an affirmative answer to IPC_M_DATA_READ. */
        /* or IPC_M_DEBUG_ALL/UDEBUG_M_MEM_READ... */
        uintptr_t dst = IPC_GET_ARG1(call->data);
        size_t size = IPC_GET_ARG2(call->data);
        int rc = copy_to_uspace((void *) dst, call->buffer, size);
        if (rc)
            IPC_SET_RETVAL(call->data, rc);
        free(call->buffer);
        call->buffer = NULL;
    }
}
 
/** 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_ARG5(call->data, phoneid);
    }
    switch (IPC_GET_METHOD(call->data)) {
    case IPC_M_DEBUG_ALL:
        return -1;
    default:
        break;
    }
    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, phone))) {
#ifdef CONFIG_UDEBUG
        udebug_stoppable_begin();
#endif
        rc = ipc_call_sync(phone, &call);
#ifdef CONFIG_UDEBUG
        udebug_stoppable_end();
#endif
        if (rc != EOK)
            return rc;
        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, phone))) {
#ifdef CONFIG_UDEBUG
        udebug_stoppable_begin();
#endif
        rc = ipc_call_sync(phone, &call);
#ifdef CONFIG_UDEBUG
        udebug_stoppable_end();
#endif
        if (rc != EOK)
            return rc;
        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, phone)))
        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, phone)))
        ipc_call(phone, call);
    else
        ipc_backsend_err(phone, call, res);
 
    return (unative_t) call;
}
 
/** Forward a received call to another destination - common code for both the
 * fast and the slow version.
 *
 * @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 arg2      New value of the second argument for the forwarded call.
 * @param arg3      New value of the third argument for the forwarded call.
 * @param arg4      New value of the fourth argument for the forwarded call.
 * @param arg5      New value of the fifth argument for the forwarded call.
 * @param mode      Flags that specify mode of the forward operation.
 * @param slow      If true, arg3, arg4 and arg5 are considered. Otherwise
 *          the function considers only the fast version arguments:
 *          i.e. arg1 and arg2.
 *
 * @return      Return 0 on succes, otherwise return an error code.
 *
 
 
 
 
 
 
 
 
 * Warning: Make sure that ARG5 is not rewritten for certain system IPC
 
 */
static unative_t sys_ipc_forward_common(unative_t callid, unative_t phoneid,
    unative_t method, unative_t arg1, unative_t arg2, unative_t arg3,
    unative_t arg4, unative_t arg5, int mode, bool slow)
{
    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, ARG2, ARG3 and ARG4 by means of method,
     * arg1, arg2 and arg3.
     * 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_ARG5(call->data));
 
            IPC_SET_ARG1(call->data, method);
            IPC_SET_ARG2(call->data, arg1);
            IPC_SET_ARG3(call->data, arg2);
            if (slow) {
                IPC_SET_ARG4(call->data, arg3);
                /*
                 * For system methods we deliberately don't
                 * overwrite ARG5.
                 */
            }
        } else {
            IPC_SET_METHOD(call->data, method);
            IPC_SET_ARG1(call->data, arg1);
            IPC_SET_ARG2(call->data, arg2);
            if (slow) {
                IPC_SET_ARG3(call->data, arg3);
                IPC_SET_ARG4(call->data, arg4);
                IPC_SET_ARG5(call->data, arg5);
            }
        }
    }
 
    return ipc_forward(call, phone, &TASK->answerbox, mode);
}
 
/** Forward a received call to another destination - fast version.
 *
 * @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 arg2      New value of the second 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, ARG2 and ARG3 are
 * overwritten in the forwarded message with the new method and the new
 * arg1 and arg2, respectively. Otherwise the METHOD, ARG1 and ARG2 are
 * rewritten with the new method, arg1 and arg2, respectively. Also note there
 * is a set of immutable methods, for which the new method and arguments are not
 * set and these values are ignored.
 */
unative_t sys_ipc_forward_fast(unative_t callid, unative_t phoneid,
    unative_t method, unative_t arg1, unative_t arg2, int mode)
{
    return sys_ipc_forward_common(callid, phoneid, method, arg1, arg2, 0, 0,
        0, mode, false);
}
 
/** Forward a received call to another destination - slow version.
 *
 * @param callid    Hash of the call to forward.
 * @param phoneid   Phone handle to use for forwarding.
 * @param data      Userspace address of the new IPC data.
 * @param mode      Flags that specify mode of the forward operation.
 *
 * @return      Return 0 on succes, otherwise return an error code.
 *
 * This function is the slow verision of the sys_ipc_forward_fast interface.
 * It can copy all five new arguments and the new method from the userspace.
 * It naturally extends the functionality of the fast version. For system
 * methods, it additionally stores the new value of arg3 to ARG4. For non-system
 * methods, it additionally stores the new value of arg3, arg4 and arg5,
 * respectively, to ARG3, ARG4 and ARG5, respectively.
 */
unative_t sys_ipc_forward_slow(unative_t callid, unative_t phoneid,
    ipc_data_t *data, int mode)
{
    ipc_data_t newdata;
    int rc;
 
    rc = copy_from_uspace(&newdata.args, &data->args,
        sizeof(newdata.args));
    if (rc != 0)
        return (unative_t) rc;
 
    return sys_ipc_forward_common(callid, phoneid,
        IPC_GET_METHOD(newdata), IPC_GET_ARG1(newdata),
        IPC_GET_ARG2(newdata), IPC_GET_ARG3(newdata),
        IPC_GET_ARG4(newdata), IPC_GET_ARG5(newdata), mode, true);
}
 
/** 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:
 
#ifdef CONFIG_UDEBUG
    udebug_stoppable_begin();
#endif  
    call = ipc_wait_for_call(&TASK->answerbox, usec,
        flags | SYNCH_FLAGS_INTERRUPTIBLE);
 
#ifdef CONFIG_UDEBUG
    udebug_stoppable_end();
#endif
    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));
 
 
 
        if (call->flags & IPC_CALL_DISCARD_ANSWER) {
            ipc_call_free(call);
            goto restart;
        } else {
            /*
             * Decrement the counter of active calls only if the
             * call is not an answer to IPC_M_PHONE_HUNGUP,
             * which doesn't contribute to the counter.
             */
            atomic_dec(&TASK->active_calls);
        }
 
        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)) {
        /*
         * The callee will not receive this call and no one else has
         * a chance to answer it. Reply with the EPARTY error code.
         */
        ipc_data_t saved_data;
        int saveddata = 0;
 
        if (answer_need_old(call)) {
            memcpy(&saved_data, &call->data, sizeof(call->data));
            saveddata = 1;
        }
       
        IPC_SET_RETVAL(call->data, EPARTY);
        (void) answer_preprocess(call, saveddata ? &saved_data : NULL);
        ipc_answer(&TASK->answerbox, call);
        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;
}
 
#include <console/console.h>
 
/**
 * Syscall connect to a task by id.
 *
 * @return      Phone id on success, or negative error code.
 */
unative_t sys_ipc_connect_kbox(sysarg64_t *uspace_taskid_arg)
{
#ifdef CONFIG_UDEBUG
    sysarg64_t taskid_arg;
    int rc;
   
    rc = copy_from_uspace(&taskid_arg, uspace_taskid_arg, sizeof(sysarg64_t));
    if (rc != 0)
        return (unative_t) rc;
 
    LOG("sys_ipc_connect_kbox(%" PRIu64 ")\n", taskid_arg.value);
 
    return ipc_connect_kbox(taskid_arg.value);
#else
    return (unative_t) ENOTSUP;
#endif
}
 
/** @}
 */
 

Rev 3022	Rev 4055
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 <ipc/kbox.h>
-		46	#include <udebug/udebug_ipc.h>
45	#include <arch/interrupt.h>	47	#include <arch/interrupt.h>
46	#include <print.h>	-
47	#include <syscall/copy.h>	48	#include <syscall/copy.h>
48	#include <security/cap.h>	49	#include <security/cap.h>
49	#include <mm/as.h>	50	#include <mm/as.h>
50	#include <print.h>	51	#include <print.h>
51		52
52	/**	53	/**
53	* Maximum buffer size allowed for IPC_M_DATA_WRITE and IPC_M_DATA_READ	54	* Maximum buffer size allowed for IPC_M_DATA_WRITE and IPC_M_DATA_READ
54	* requests.	55	* requests.
55	*/	56	*/
56	#define DATA_XFER_LIMIT (64 * 1024)	57	#define DATA_XFER_LIMIT (64 * 1024)
57		58
58	#define GET_CHECK_PHONE(phone, phoneid, err) \	59	#define GET_CHECK_PHONE(phone, phoneid, err) \
59	{ \	60	{ \
60	if (phoneid > IPC_MAX_PHONES) { \	61	if (phoneid > IPC_MAX_PHONES) { \
61	err; \	62	err; \
62	} \	63	} \
63	phone = &TASK->phones[phoneid]; \	64	phone = &TASK->phones[phoneid]; \
64	}	65	}
65		66
66	#define STRUCT_TO_USPACE(dst, src) copy_to_uspace(dst, src, sizeof(*(src)))	67	#define STRUCT_TO_USPACE(dst, src) copy_to_uspace(dst, src, sizeof(*(src)))
67		68
68	/** Decide if the method is a system method.	69	/** Decide if the method is a system method.
69	*	70	*
70	* @param method Method to be decided.	71	* @param method Method to be decided.
71	*	72	*
72	* @return Return 1 if the method is a system method.	73	* @return Return 1 if the method is a system method.
73	* Otherwise return 0.	74	* Otherwise return 0.
74	*/	75	*/
75	static inline int method_is_system(unative_t method)	76	static inline int method_is_system(unative_t method)
76	{	77	{
77	if (method <= IPC_M_LAST_SYSTEM)	78	if (method <= IPC_M_LAST_SYSTEM)
78	return 1;	79	return 1;
79	return 0;	80	return 0;
80	}	81	}
81		82
82	/** Decide if the message with this method is forwardable.	83	/** Decide if the message with this method is forwardable.
83	*	84	*
84	* - some system messages may be forwarded, for some of them	85	* - some system messages may be forwarded, for some of them
85	* it is useless	86	* it is useless
86	*	87	*
87	* @param method Method to be decided.	88	* @param method Method to be decided.
88	*	89	*
89	* @return Return 1 if the method is forwardable.	90	* @return Return 1 if the method is forwardable.
90	* Otherwise return 0.	91	* Otherwise return 0.
91	*/	92	*/
92	static inline int method_is_forwardable(unative_t method)	93	static inline int method_is_forwardable(unative_t method)
93	{	94	{
94	switch (method) {	95	switch (method) {
95	case IPC_M_PHONE_HUNGUP:	96	case IPC_M_PHONE_HUNGUP:
96	/* This message is meant only for the original recipient. */	97	/* This message is meant only for the original recipient. */
97	return 0;	98	return 0;
98	default:	99	default:
99	return 1;	100	return 1;
100	}	101	}
101	}	102	}
102		103
103	/** Decide if the message with this method is immutable on forward.	104	/** Decide if the message with this method is immutable on forward.
104	*	105	*
105	* - some system messages may be forwarded but their content cannot be altered	106	* - some system messages may be forwarded but their content cannot be altered
106	*	107	*
107	* @param method Method to be decided.	108	* @param method Method to be decided.
108	*	109	*
109	* @return Return 1 if the method is immutable on forward.	110	* @return Return 1 if the method is immutable on forward.
110	* Otherwise return 0.	111	* Otherwise return 0.
111	*/	112	*/
112	static inline int method_is_immutable(unative_t method)	113	static inline int method_is_immutable(unative_t method)
113	{	114	{
114	switch (method) {	115	switch (method) {
115	case IPC_M_SHARE_OUT:	116	case IPC_M_SHARE_OUT:
116	case IPC_M_SHARE_IN:	117	case IPC_M_SHARE_IN:
117	case IPC_M_DATA_WRITE:	118	case IPC_M_DATA_WRITE:
118	case IPC_M_DATA_READ:	119	case IPC_M_DATA_READ:
119	return 1;	120	return 1;
120	break;	121	break;
121	default:	122	default:
122	return 0;	123	return 0;
123	}	124	}
124	}	125	}
125		126
126		127
127	/***********************************************************************	128	/***********************************************************************
128	* Functions that preprocess answer before sending it to the recepient.	129	* Functions that preprocess answer before sending it to the recepient.
129	***********************************************************************/	130	***********************************************************************/
130		131
131	/** Decide if the caller (e.g. ipc_answer()) should save the old call contents	132	/** Decide if the caller (e.g. ipc_answer()) should save the old call contents
132	* for answer_preprocess().	133	* for answer_preprocess().
133	*	134	*
134	* @param call Call structure to be decided.	135	* @param call Call structure to be decided.
135	*	136	*
136	* @return Return 1 if the old call contents should be saved.	137	* @return Return 1 if the old call contents should be saved.
137	* Return 0 otherwise.	138	* Return 0 otherwise.
138	*/	139	*/
139	static inline int answer_need_old(call_t *call)	140	static inline int answer_need_old(call_t *call)
140	{	141	{
141	switch (IPC_GET_METHOD(call->data)) {	142	switch (IPC_GET_METHOD(call->data)) {
142	case IPC_M_CONNECT_TO_ME:	143	case IPC_M_CONNECT_TO_ME:
143	case IPC_M_CONNECT_ME_TO:	144	case IPC_M_CONNECT_ME_TO:
144	case IPC_M_SHARE_OUT:	145	case IPC_M_SHARE_OUT:
145	case IPC_M_SHARE_IN:	146	case IPC_M_SHARE_IN:
146	case IPC_M_DATA_WRITE:	147	case IPC_M_DATA_WRITE:
147	case IPC_M_DATA_READ:	148	case IPC_M_DATA_READ:
148	return 1;	149	return 1;
149	default:	150	default:
150	return 0;	151	return 0;
151	}	152	}
152	}	153	}
153		154
154	/** Interpret process answer as control information.	155	/** Interpret process answer as control information.
155	*	156	*
156	* This function is called directly after sys_ipc_answer().	157	* This function is called directly after sys_ipc_answer().
157	*	158	*
158	* @param answer Call structure with the answer.	159	* @param answer Call structure with the answer.
159	* @param olddata Saved data of the request.	160	* @param olddata Saved data of the request.
160	*	161	*
161	* @return Return 0 on success or an error code.	162	* @return Return 0 on success or an error code.
162	*/	163	*/
163	static inline int answer_preprocess(call_t answer, ipc_data_t olddata)	164	static inline int answer_preprocess(call_t answer, ipc_data_t olddata)
164	{	165	{
165	int phoneid;	166	int phoneid;
166		167
167	if ((native_t) IPC_GET_RETVAL(answer->data) == EHANGUP) {	168	if ((native_t) IPC_GET_RETVAL(answer->data) == EHANGUP) {
168	/* In case of forward, hangup the forwared phone,	169	/* In case of forward, hangup the forwared phone,
169	* not the originator	170	* not the originator
170	*/	171	*/
171	mutex_lock(&answer->data.phone->lock);	172	mutex_lock(&answer->data.phone->lock);
172	spinlock_lock(&TASK->answerbox.lock);	173	spinlock_lock(&TASK->answerbox.lock);
173	if (answer->data.phone->state == IPC_PHONE_CONNECTED) {	174	if (answer->data.phone->state == IPC_PHONE_CONNECTED) {
174	list_remove(&answer->data.phone->link);	175	list_remove(&answer->data.phone->link);
175	answer->data.phone->state = IPC_PHONE_SLAMMED;	176	answer->data.phone->state = IPC_PHONE_SLAMMED;
176	}	177	}
177	spinlock_unlock(&TASK->answerbox.lock);	178	spinlock_unlock(&TASK->answerbox.lock);
178	mutex_unlock(&answer->data.phone->lock);	179	mutex_unlock(&answer->data.phone->lock);
179	}	180	}
180		181
181	if (!olddata)	182	if (!olddata)
182	return 0;	183	return 0;
183		184
184	if (IPC_GET_METHOD(*olddata) == IPC_M_CONNECT_TO_ME) {	185	if (IPC_GET_METHOD(*olddata) == IPC_M_CONNECT_TO_ME) {
185	phoneid = IPC_GET_ARG5(*olddata);	186	phoneid = IPC_GET_ARG5(*olddata);
186	if (IPC_GET_RETVAL(answer->data)) {	187	if (IPC_GET_RETVAL(answer->data)) {
187	/* The connection was not accepted */	188	/* The connection was not accepted */
188	phone_dealloc(phoneid);	189	phone_dealloc(phoneid);
189	} else {	190	} else {
190	/* The connection was accepted */	191	/* The connection was accepted */
191	phone_connect(phoneid, &answer->sender->answerbox);	192	phone_connect(phoneid, &answer->sender->answerbox);
192	/* Set 'phone hash' as arg5 of response */	193	/* Set 'phone hash' as arg5 of response */
193	IPC_SET_ARG5(answer->data,	194	IPC_SET_ARG5(answer->data,
194	(unative_t) &TASK->phones[phoneid]);	195	(unative_t) &TASK->phones[phoneid]);
195	}	196	}
196	} else if (IPC_GET_METHOD(*olddata) == IPC_M_CONNECT_ME_TO) {	197	} else if (IPC_GET_METHOD(*olddata) == IPC_M_CONNECT_ME_TO) {
197	/* If the users accepted call, connect */	198	/* If the users accepted call, connect */
198	if (!IPC_GET_RETVAL(answer->data)) {	199	if (!IPC_GET_RETVAL(answer->data)) {
199	ipc_phone_connect((phone_t ) IPC_GET_ARG5(olddata),	200	ipc_phone_connect((phone_t ) IPC_GET_ARG5(olddata),
200	&TASK->answerbox);	201	&TASK->answerbox);
201	}	202	}
202	} else if (IPC_GET_METHOD(*olddata) == IPC_M_SHARE_OUT) {	203	} else if (IPC_GET_METHOD(*olddata) == IPC_M_SHARE_OUT) {
203	if (!IPC_GET_RETVAL(answer->data)) {	204	if (!IPC_GET_RETVAL(answer->data)) {
204	/* Accepted, handle as_area receipt */	205	/* Accepted, handle as_area receipt */
205	ipl_t ipl;	206	ipl_t ipl;
206	int rc;	207	int rc;
207	as_t *as;	208	as_t *as;
208		209
209	ipl = interrupts_disable();	210	ipl = interrupts_disable();
210	spinlock_lock(&answer->sender->lock);	211	spinlock_lock(&answer->sender->lock);
211	as = answer->sender->as;	212	as = answer->sender->as;
212	spinlock_unlock(&answer->sender->lock);	213	spinlock_unlock(&answer->sender->lock);
213	interrupts_restore(ipl);	214	interrupts_restore(ipl);
214		215
215	rc = as_area_share(as, IPC_GET_ARG1(*olddata),	216	rc = as_area_share(as, IPC_GET_ARG1(*olddata),
216	IPC_GET_ARG2(*olddata), AS,	217	IPC_GET_ARG2(*olddata), AS,
217	IPC_GET_ARG1(answer->data), IPC_GET_ARG3(*olddata));	218	IPC_GET_ARG1(answer->data), IPC_GET_ARG3(*olddata));
218	IPC_SET_RETVAL(answer->data, rc);	219	IPC_SET_RETVAL(answer->data, rc);
219	return rc;	220	return rc;
220	}	221	}
221	} else if (IPC_GET_METHOD(*olddata) == IPC_M_SHARE_IN) {	222	} else if (IPC_GET_METHOD(*olddata) == IPC_M_SHARE_IN) {
222	if (!IPC_GET_RETVAL(answer->data)) {	223	if (!IPC_GET_RETVAL(answer->data)) {
223	ipl_t ipl;	224	ipl_t ipl;
224	as_t *as;	225	as_t *as;
225	int rc;	226	int rc;
226		227
227	ipl = interrupts_disable();	228	ipl = interrupts_disable();
228	spinlock_lock(&answer->sender->lock);	229	spinlock_lock(&answer->sender->lock);
229	as = answer->sender->as;	230	as = answer->sender->as;
230	spinlock_unlock(&answer->sender->lock);	231	spinlock_unlock(&answer->sender->lock);
231	interrupts_restore(ipl);	232	interrupts_restore(ipl);
232		233
233	rc = as_area_share(AS, IPC_GET_ARG1(answer->data),	234	rc = as_area_share(AS, IPC_GET_ARG1(answer->data),
234	IPC_GET_ARG2(olddata), as, IPC_GET_ARG1(olddata),	235	IPC_GET_ARG2(olddata), as, IPC_GET_ARG1(olddata),
235	IPC_GET_ARG2(answer->data));	236	IPC_GET_ARG2(answer->data));
236	IPC_SET_RETVAL(answer->data, rc);	237	IPC_SET_RETVAL(answer->data, rc);
237	}	238	}
238	} else if (IPC_GET_METHOD(*olddata) == IPC_M_DATA_READ) {	239	} else if (IPC_GET_METHOD(*olddata) == IPC_M_DATA_READ) {
239	ASSERT(!answer->buffer);	240	ASSERT(!answer->buffer);
240	if (!IPC_GET_RETVAL(answer->data)) {	241	if (!IPC_GET_RETVAL(answer->data)) {
241	/* The recipient agreed to send data. */	242	/* The recipient agreed to send data. */
242	uintptr_t src = IPC_GET_ARG1(answer->data);	243	uintptr_t src = IPC_GET_ARG1(answer->data);
243	uintptr_t dst = IPC_GET_ARG1(*olddata);	244	uintptr_t dst = IPC_GET_ARG1(*olddata);
244	size_t max_size = IPC_GET_ARG2(*olddata);	245	size_t max_size = IPC_GET_ARG2(*olddata);
245	size_t size = IPC_GET_ARG2(answer->data);	246	size_t size = IPC_GET_ARG2(answer->data);
246	if (size && size <= max_size) {	247	if (size && size <= max_size) {
247	/*	248	/*
248	* Copy the destination VA so that this piece of	249	* Copy the destination VA so that this piece of
249	* information is not lost.	250	* information is not lost.
250	*/	251	*/
251	IPC_SET_ARG1(answer->data, dst);	252	IPC_SET_ARG1(answer->data, dst);
252		253
253	answer->buffer = malloc(size, 0);	254	answer->buffer = malloc(size, 0);
254	int rc = copy_from_uspace(answer->buffer,	255	int rc = copy_from_uspace(answer->buffer,
255	(void *) src, size);	256	(void *) src, size);
256	if (rc) {	257	if (rc) {
257	IPC_SET_RETVAL(answer->data, rc);	258	IPC_SET_RETVAL(answer->data, rc);
258	free(answer->buffer);	259	free(answer->buffer);
259	answer->buffer = NULL;	260	answer->buffer = NULL;
260	}	261	}
261	} else if (!size) {	262	} else if (!size) {
262	IPC_SET_RETVAL(answer->data, EOK);	263	IPC_SET_RETVAL(answer->data, EOK);
263	} else {	264	} else {
264	IPC_SET_RETVAL(answer->data, ELIMIT);	265	IPC_SET_RETVAL(answer->data, ELIMIT);
265	}	266	}
266	}	267	}
267	} else if (IPC_GET_METHOD(*olddata) == IPC_M_DATA_WRITE) {	268	} else if (IPC_GET_METHOD(*olddata) == IPC_M_DATA_WRITE) {
268	ASSERT(answer->buffer);	269	ASSERT(answer->buffer);
269	if (!IPC_GET_RETVAL(answer->data)) {	270	if (!IPC_GET_RETVAL(answer->data)) {
270	/* The recipient agreed to receive data. */	271	/* The recipient agreed to receive data. */
271	int rc;	272	int rc;
272	uintptr_t dst;	273	uintptr_t dst;
273	uintptr_t size;	274	size_t size;
274	uintptr_t max_size;	275	size_t max_size;
275		276
276	dst = IPC_GET_ARG1(answer->data);	277	dst = (uintptr_t)IPC_GET_ARG1(answer->data);
277	size = IPC_GET_ARG2(answer->data);	278	size = (size_t)IPC_GET_ARG2(answer->data);
278	max_size = IPC_GET_ARG2(*olddata);	279	max_size = (size_t)IPC_GET_ARG2(*olddata);
279		280
280	if (size <= max_size) {	281	if (size <= max_size) {
281	rc = copy_to_uspace((void *) dst,	282	rc = copy_to_uspace((void *) dst,
282	answer->buffer, size);	283	answer->buffer, size);
283	if (rc)	284	if (rc)
284	IPC_SET_RETVAL(answer->data, rc);	285	IPC_SET_RETVAL(answer->data, rc);
285	} else {	286	} else {
286	IPC_SET_RETVAL(answer->data, ELIMIT);	287	IPC_SET_RETVAL(answer->data, ELIMIT);
287	}	288	}
288	}	289	}
289	free(answer->buffer);	290	free(answer->buffer);
290	answer->buffer = NULL;	291	answer->buffer = NULL;
291	}	292	}
292	return 0;	293	return 0;
293	}	294	}
294		295
295	/** Called before the request is sent.	296	/** Called before the request is sent.
296	*	297	*
297	* @param call Call structure with the request.	298	* @param call Call structure with the request.
-		299	* @param phone Phone that the call will be sent through.
298	*	300	*
299	* @return Return 0 on success, ELIMIT or EPERM on error.	301	* @return Return 0 on success, ELIMIT or EPERM on error.
300	*/	302	*/
301	static int request_preprocess(call_t *call)	303	static int request_preprocess(call_t call, phone_t phone)
302	{	304	{
303	int newphid;	305	int newphid;
304	size_t size;	306	size_t size;
305	uintptr_t src;	307	uintptr_t src;
306	int rc;	308	int rc;
307		309
308	switch (IPC_GET_METHOD(call->data)) {	310	switch (IPC_GET_METHOD(call->data)) {
309	case IPC_M_CONNECT_ME_TO:	311	case IPC_M_CONNECT_ME_TO:
310	newphid = phone_alloc();	312	newphid = phone_alloc();
311	if (newphid < 0)	313	if (newphid < 0)
312	return ELIMIT;	314	return ELIMIT;
313	/* Set arg5 for server */	315	/* Set arg5 for server */
314	IPC_SET_ARG5(call->data, (unative_t) &TASK->phones[newphid]);	316	IPC_SET_ARG5(call->data, (unative_t) &TASK->phones[newphid]);
315	call->flags \|= IPC_CALL_CONN_ME_TO;	317	call->flags \|= IPC_CALL_CONN_ME_TO;
316	call->priv = newphid;	318	call->priv = newphid;
317	break;	319	break;
318	case IPC_M_SHARE_OUT:	320	case IPC_M_SHARE_OUT:
319	size = as_area_get_size(IPC_GET_ARG1(call->data));	321	size = as_area_get_size(IPC_GET_ARG1(call->data));
320	if (!size)	322	if (!size)
321	return EPERM;	323	return EPERM;
322	IPC_SET_ARG2(call->data, size);	324	IPC_SET_ARG2(call->data, size);
323	break;	325	break;
324	case IPC_M_DATA_READ:	326	case IPC_M_DATA_READ:
325	size = IPC_GET_ARG2(call->data);	327	size = IPC_GET_ARG2(call->data);
326	if ((size <= 0 \|\| (size > DATA_XFER_LIMIT)))	328	if ((size <= 0 \|\| (size > DATA_XFER_LIMIT)))
327	return ELIMIT;	329	return ELIMIT;
328	break;	330	break;
329	case IPC_M_DATA_WRITE:	331	case IPC_M_DATA_WRITE:
330	src = IPC_GET_ARG1(call->data);	332	src = IPC_GET_ARG1(call->data);
331	size = IPC_GET_ARG2(call->data);	333	size = IPC_GET_ARG2(call->data);
332		334
333	if ((size <= 0) \|\| (size > DATA_XFER_LIMIT))	335	if ((size <= 0) \|\| (size > DATA_XFER_LIMIT))
334	return ELIMIT;	336	return ELIMIT;
335		337
336	call->buffer = (uint8_t *) malloc(size, 0);	338	call->buffer = (uint8_t *) malloc(size, 0);
337	rc = copy_from_uspace(call->buffer, (void *) src, size);	339	rc = copy_from_uspace(call->buffer, (void *) src, size);
338	if (rc != 0) {	340	if (rc != 0) {
339	free(call->buffer);	341	free(call->buffer);
340	return rc;	342	return rc;
341	}	343	}
342	break;	344	break;
-		345	#ifdef CONFIG_UDEBUG
-		346	case IPC_M_DEBUG_ALL:
-		347	return udebug_request_preprocess(call, phone);
-		348	#endif
343	default:	349	default:
344	break;	350	break;
345	}	351	}
346	return 0;	352	return 0;
347	}	353	}
348		354
349	/*******************************************************************************	355	/*******************************************************************************
350	* Functions called to process received call/answer before passing it to uspace.	356	* Functions called to process received call/answer before passing it to uspace.
351	*******************************************************************************/	357	*******************************************************************************/
352		358
353	/** Do basic kernel processing of received call answer.	359	/** Do basic kernel processing of received call answer.
354	*	360	*
355	* @param call Call structure with the answer.	361	* @param call Call structure with the answer.
356	*/	362	*/
357	static void process_answer(call_t *call)	363	static void process_answer(call_t *call)
358	{	364	{
359	if (((native_t) IPC_GET_RETVAL(call->data) == EHANGUP) &&	365	if (((native_t) IPC_GET_RETVAL(call->data) == EHANGUP) &&
360	(call->flags & IPC_CALL_FORWARDED))	366	(call->flags & IPC_CALL_FORWARDED))
361	IPC_SET_RETVAL(call->data, EFORWARD);	367	IPC_SET_RETVAL(call->data, EFORWARD);
362		368
363	if (call->flags & IPC_CALL_CONN_ME_TO) {	369	if (call->flags & IPC_CALL_CONN_ME_TO) {
364	if (IPC_GET_RETVAL(call->data))	370	if (IPC_GET_RETVAL(call->data))
365	phone_dealloc(call->priv);	371	phone_dealloc(call->priv);
366	else	372	else
367	IPC_SET_ARG5(call->data, call->priv);	373	IPC_SET_ARG5(call->data, call->priv);
368	}	374	}
369		375
370	if (call->buffer) {	376	if (call->buffer) {
371	/* This must be an affirmative answer to IPC_M_DATA_READ. */	377	/* This must be an affirmative answer to IPC_M_DATA_READ. */
-		378	/* or IPC_M_DEBUG_ALL/UDEBUG_M_MEM_READ... */
372	uintptr_t dst = IPC_GET_ARG1(call->data);	379	uintptr_t dst = IPC_GET_ARG1(call->data);
373	size_t size = IPC_GET_ARG2(call->data);	380	size_t size = IPC_GET_ARG2(call->data);
374	int rc = copy_to_uspace((void *) dst, call->buffer, size);	381	int rc = copy_to_uspace((void *) dst, call->buffer, size);
375	if (rc)	382	if (rc)
376	IPC_SET_RETVAL(call->data, rc);	383	IPC_SET_RETVAL(call->data, rc);
377	free(call->buffer);	384	free(call->buffer);
378	call->buffer = NULL;	385	call->buffer = NULL;
379	}	386	}
380	}	387	}
381		388
382	/** Do basic kernel processing of received call request.	389	/** Do basic kernel processing of received call request.
383	*	390	*
384	* @param box Destination answerbox structure.	391	* @param box Destination answerbox structure.
385	* @param call Call structure with the request.	392	* @param call Call structure with the request.
386	*	393	*
387	* @return Return 0 if the call should be passed to userspace.	394	* @return Return 0 if the call should be passed to userspace.
388	* Return -1 if the call should be ignored.	395	* Return -1 if the call should be ignored.
389	*/	396	*/
390	static int process_request(answerbox_t box, call_t call)	397	static int process_request(answerbox_t box, call_t call)
391	{	398	{
392	int phoneid;	399	int phoneid;
393		400
394	if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_TO_ME) {	401	if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_TO_ME) {
395	phoneid = phone_alloc();	402	phoneid = phone_alloc();
396	if (phoneid < 0) { /* Failed to allocate phone */	403	if (phoneid < 0) { /* Failed to allocate phone */
397	IPC_SET_RETVAL(call->data, ELIMIT);	404	IPC_SET_RETVAL(call->data, ELIMIT);
398	ipc_answer(box, call);	405	ipc_answer(box, call);
399	return -1;	406	return -1;
400	}	407	}
401	IPC_SET_ARG5(call->data, phoneid);	408	IPC_SET_ARG5(call->data, phoneid);
402	}	409	}
-		410	switch (IPC_GET_METHOD(call->data)) {
-		411	case IPC_M_DEBUG_ALL:
-		412	return -1;
-		413	default:
-		414	break;
-		415	}
403	return 0;	416	return 0;
404	}	417	}
405		418
406	/** Make a fast call over IPC, wait for reply and return to user.	419	/** Make a fast call over IPC, wait for reply and return to user.
407	*	420	*
408	* This function can handle only three arguments of payload, but is faster than	421	* This function can handle only three arguments of payload, but is faster than
409	* the generic function (i.e. sys_ipc_call_sync_slow()).	422	* the generic function (i.e. sys_ipc_call_sync_slow()).
410	*	423	*
411	* @param phoneid Phone handle for the call.	424	* @param phoneid Phone handle for the call.
412	* @param method Method of the call.	425	* @param method Method of the call.
413	* @param arg1 Service-defined payload argument.	426	* @param arg1 Service-defined payload argument.
414	* @param arg2 Service-defined payload argument.	427	* @param arg2 Service-defined payload argument.
415	* @param arg3 Service-defined payload argument.	428	* @param arg3 Service-defined payload argument.
416	* @param data Address of userspace structure where the reply call will	429	* @param data Address of userspace structure where the reply call will
417	* be stored.	430	* be stored.
418	*	431	*
419	* @return Returns 0 on success.	432	* @return Returns 0 on success.
420	* Return ENOENT if there is no such phone handle.	433	* Return ENOENT if there is no such phone handle.
421	*/	434	*/
422	unative_t sys_ipc_call_sync_fast(unative_t phoneid, unative_t method,	435	unative_t sys_ipc_call_sync_fast(unative_t phoneid, unative_t method,
423	unative_t arg1, unative_t arg2, unative_t arg3, ipc_data_t *data)	436	unative_t arg1, unative_t arg2, unative_t arg3, ipc_data_t *data)
424	{	437	{
425	call_t call;	438	call_t call;
426	phone_t *phone;	439	phone_t *phone;
427	int res;	440	int res;
428	int rc;	441	int rc;
429		442
430	GET_CHECK_PHONE(phone, phoneid, return ENOENT);	443	GET_CHECK_PHONE(phone, phoneid, return ENOENT);
431		444
432	ipc_call_static_init(&call);	445	ipc_call_static_init(&call);
433	IPC_SET_METHOD(call.data, method);	446	IPC_SET_METHOD(call.data, method);
434	IPC_SET_ARG1(call.data, arg1);	447	IPC_SET_ARG1(call.data, arg1);
435	IPC_SET_ARG2(call.data, arg2);	448	IPC_SET_ARG2(call.data, arg2);
436	IPC_SET_ARG3(call.data, arg3);	449	IPC_SET_ARG3(call.data, arg3);
437	/*	450	/*
438	* To achieve deterministic behavior, zero out arguments that are beyond	451	* To achieve deterministic behavior, zero out arguments that are beyond
439	* the limits of the fast version.	452	* the limits of the fast version.
440	*/	453	*/
441	IPC_SET_ARG4(call.data, 0);	454	IPC_SET_ARG4(call.data, 0);
442	IPC_SET_ARG5(call.data, 0);	455	IPC_SET_ARG5(call.data, 0);
443		456
444	if (!(res = request_preprocess(&call))) {	457	if (!(res = request_preprocess(&call, phone))) {
-		458	#ifdef CONFIG_UDEBUG
-		459	udebug_stoppable_begin();
-		460	#endif
445	ipc_call_sync(phone, &call);	461	rc = ipc_call_sync(phone, &call);
-		462	#ifdef CONFIG_UDEBUG
-		463	udebug_stoppable_end();
-		464	#endif
-		465	if (rc != EOK)
-		466	return rc;
446	process_answer(&call);	467	process_answer(&call);
-		468
447	} else {	469	} else {
448	IPC_SET_RETVAL(call.data, res);	470	IPC_SET_RETVAL(call.data, res);
449	}	471	}
450	rc = STRUCT_TO_USPACE(&data->args, &call.data.args);	472	rc = STRUCT_TO_USPACE(&data->args, &call.data.args);
451	if (rc != 0)	473	if (rc != 0)
452	return rc;	474	return rc;
453		475
454	return 0;	476	return 0;
455	}	477	}
456		478
457	/** Make a synchronous IPC call allowing to transmit the entire payload.	479	/** Make a synchronous IPC call allowing to transmit the entire payload.
458	*	480	*
459	* @param phoneid Phone handle for the call.	481	* @param phoneid Phone handle for the call.
460	* @param question Userspace address of call data with the request.	482	* @param question Userspace address of call data with the request.
461	* @param reply Userspace address of call data where to store the	483	* @param reply Userspace address of call data where to store the
462	* answer.	484	* answer.
463	*	485	*
464	* @return Zero on success or an error code.	486	* @return Zero on success or an error code.
465	*/	487	*/
466	unative_t sys_ipc_call_sync_slow(unative_t phoneid, ipc_data_t *question,	488	unative_t sys_ipc_call_sync_slow(unative_t phoneid, ipc_data_t *question,
467	ipc_data_t *reply)	489	ipc_data_t *reply)
468	{	490	{
469	call_t call;	491	call_t call;
470	phone_t *phone;	492	phone_t *phone;
471	int res;	493	int res;
472	int rc;	494	int rc;
473		495
474	ipc_call_static_init(&call);	496	ipc_call_static_init(&call);
475	rc = copy_from_uspace(&call.data.args, &question->args,	497	rc = copy_from_uspace(&call.data.args, &question->args,
476	sizeof(call.data.args));	498	sizeof(call.data.args));
477	if (rc != 0)	499	if (rc != 0)

Subversion Repositories HelenOS

(root)/branches/dd/kernel/generic/src/ipc/sysipc.c – Rev 3022 → 4055