HelenOS sources

root/kernel/generic/src/ipc/ops/shareout.c

DEFINITIONS

1. request_preprocess
2. answer_preprocess

/*
 * Copyright (c) 2012 Jakub Jermar
 * 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 kernel_generic_ipc
 * @{
 */
/** @file
 */

#include <ipc/sysipc_ops.h>
#include <ipc/ipc.h>
#include <mm/as.h>
#include <synch/spinlock.h>
#include <proc/task.h>
#include <syscall/copy.h>
#include <abi/errno.h>
#include <arch.h>

static errno_t request_preprocess(call_t *call, phone_t *phone)
{
        size_t size = as_area_get_size(ipc_get_arg1(&call->data));

        if (!size)
                return EPERM;
        ipc_set_arg2(&call->data, size);

        return EOK;
}

static errno_t answer_preprocess(call_t *answer, ipc_data_t *olddata)
{
        errno_t rc = EOK;

        if (!ipc_get_retval(&answer->data)) {
                /* Accepted, handle as_area receipt */

                irq_spinlock_lock(&answer->sender->lock, true);
                as_t *as = answer->sender->as;
                irq_spinlock_unlock(&answer->sender->lock, true);

                uintptr_t dst_base = (uintptr_t) -1;
                rc = as_area_share(as, ipc_get_arg1(olddata),
                    ipc_get_arg2(olddata), AS, ipc_get_arg3(olddata),
                    &dst_base, ipc_get_arg1(&answer->data));

                if (rc == EOK) {
                        rc = copy_to_uspace(ipc_get_arg2(&answer->data),
                            &dst_base, sizeof(dst_base));
                }

                ipc_set_retval(&answer->data, rc);
        }

        return rc;
}

sysipc_ops_t ipc_m_share_out_ops = {
        .request_preprocess = request_preprocess,
        .request_forget = null_request_forget,
        .request_process = null_request_process,
        .answer_cleanup = null_answer_cleanup,
        .answer_preprocess = answer_preprocess,
        .answer_process = null_answer_process,
};

/** @}
 */