/*-
 * Copyright (c) 2017 Ruslan Bukin <br@bsdpad.com>
 * All rights reserved.
 *
 * This software was developed by BAE Systems, the University of Cambridge
 * Computer Laboratory, and Memorial University under DARPA/AFRL contract
 * FA8650-15-C-7558 ("CADETS"), as part of the DARPA Transparent Computing
 * (TC) research program.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/capsicum.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/file.h>
#include <sys/proc.h>

#include <machine/sgx.h>
#include <machine/../linux/linux.h>
#include <machine/../linux/linux_proto.h>
#include <compat/linux/linux_ioctl.h>

#include <amd64/sgx/sgxvar.h>

#include <sys/ioccom.h>

#define SGX_LINUX_IOCTL_MIN     (SGX_IOC_ENCLAVE_CREATE & 0xffff)
#define SGX_LINUX_IOCTL_MAX     (SGX_IOC_ENCLAVE_INIT & 0xffff)

static int
sgx_linux_ioctl(struct thread *td, struct linux_ioctl_args *args)
{
        uint8_t data[SGX_IOCTL_MAX_DATA_LEN];
        cap_rights_t rights;
        struct file *fp;
        u_long cmd;
        int error;
        int len;

        error = fget(td, args->fd, cap_rights_init_one(&rights, CAP_IOCTL),
            &fp);
        if (error != 0)
                return (error);

        cmd = args->cmd;

        args->cmd &= ~(LINUX_IOC_IN | LINUX_IOC_OUT);
        if ((cmd & LINUX_IOC_IN) != 0)
                args->cmd |= IOC_IN;
        if ((cmd & LINUX_IOC_OUT) != 0)
                args->cmd |= IOC_OUT;

        len = IOCPARM_LEN(cmd);
        if (len > SGX_IOCTL_MAX_DATA_LEN) {
                error = EINVAL;
                goto out;
        }

        if ((cmd & LINUX_IOC_IN) != 0) {
                error = copyin((void *)args->arg, data, len);
                if (error != 0)
                        goto out;
        }

        error = fo_ioctl(fp, args->cmd, (caddr_t)data, td->td_ucred, td);
out:
        fdrop(fp, td);
        return (error);
}

LINUX_IOCTL_SET(sgx, SGX_LINUX_IOCTL_MIN, SGX_LINUX_IOCTL_MAX);

static int
sgx_linux_modevent(module_t mod, int type, void *data)
{

        return (0);
}

DEV_MODULE(sgx_linux, sgx_linux_modevent, NULL);
MODULE_DEPEND(sgx_linux, linux64, 1, 1, 1);