xref: /freebsd/sys/dev/tdfx/tdfx_linux.c (revision 62a52c15422470f97fc7b311d89c83f910bcc1b1)
1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
3  *
4  * Copyright (c) 2006 The FreeBSD Project
5  * All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  *
16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26  * SUCH DAMAGE.
27  */
28 
29 #include <sys/param.h>
30 #include <sys/capsicum.h>
31 #include <sys/file.h>
32 #include <sys/kernel.h>
33 #include <sys/module.h>
34 #include <sys/proc.h>
35 #include <sys/systm.h>
36 
37 #include <dev/tdfx/tdfx_linux.h>
38 
39 LINUX_IOCTL_SET(tdfx, LINUX_IOCTL_TDFX_MIN, LINUX_IOCTL_TDFX_MAX);
40 
41 /*
42  * Linux emulation IOCTL for /dev/tdfx
43  */
44 static int
45 linux_ioctl_tdfx(struct thread *td, struct linux_ioctl_args* args)
46 {
47    cap_rights_t rights;
48    int error = 0;
49    u_long cmd = args->cmd & 0xffff;
50 
51    /* The structure passed to ioctl has two shorts, one int
52       and one void*. */
53    char d_pio[2*sizeof(short) + sizeof(int) + sizeof(void*)];
54 
55    struct file *fp;
56 
57    error = fget(td, args->fd, cap_rights_init_one(&rights, CAP_IOCTL), &fp);
58    if (error != 0)
59 	   return (error);
60    /* We simply copy the data and send it right to ioctl */
61    error = copyin((caddr_t)args->arg, &d_pio, sizeof(d_pio));
62    if (error == 0)
63 	error = fo_ioctl(fp, cmd, (caddr_t)&d_pio, td->td_ucred, td);
64    fdrop(fp, td);
65    return error;
66 }
67 
68 static int
69 tdfx_linux_modevent(struct module *mod __unused, int what, void *arg __unused)
70 {
71 
72 	switch (what) {
73 	case MOD_LOAD:
74 	case MOD_UNLOAD:
75 		return (0);
76 	}
77 	return (EOPNOTSUPP);
78 }
79 
80 static moduledata_t tdfx_linux_mod = {
81 	"tdfx_linux",
82 	tdfx_linux_modevent,
83 	0
84 };
85 
86 /* As in SYSCALL_MODULE */
87 DECLARE_MODULE(tdfx_linux, tdfx_linux_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE);
88 MODULE_VERSION(tdfx_linux, 1);
89 MODULE_DEPEND(tdfx_linux, tdfx, 1, 1, 1);
90 MODULE_DEPEND(tdfx_linux, linux, 1, 1, 1);
91