1 /**
2  * \file mga_ioc32.c
3  *
4  * 32-bit ioctl compatibility routines for the MGA DRM.
5  *
6  * \author Dave Airlie <airlied@linux.ie> with code from patches by Egbert Eich
7  *
8  *
9  * Copyright (C) Paul Mackerras 2005
10  * Copyright (C) Egbert Eich 2003,2004
11  * Copyright (C) Dave Airlie 2005
12  * All Rights Reserved.
13  *
14  * Permission is hereby granted, free of charge, to any person obtaining a
15  * copy of this software and associated documentation files (the "Software"),
16  * to deal in the Software without restriction, including without limitation
17  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
18  * and/or sell copies of the Software, and to permit persons to whom the
19  * Software is furnished to do so, subject to the following conditions:
20  *
21  * The above copyright notice and this permission notice (including the next
22  * paragraph) shall be included in all copies or substantial portions of the
23  * Software.
24  *
25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
26  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
27  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
28  * THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
29  * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
30  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
31  * IN THE SOFTWARE.
32  */
33 
34 #include <linux/compat.h>
35 
36 #include "drmP.h"
37 #include "drm.h"
38 
39 #include "nouveau_drv.h"
40 
41 /**
42  * Called whenever a 32-bit process running under a 64-bit kernel
43  * performs an ioctl on /dev/dri/card<n>.
44  *
45  * \param filp file pointer.
46  * \param cmd command.
47  * \param arg user argument.
48  * \return zero on success or negative number on failure.
49  */
50 long nouveau_compat_ioctl(struct file *filp, unsigned int cmd,
51 			 unsigned long arg)
52 {
53 	unsigned int nr = DRM_IOCTL_NR(cmd);
54 	drm_ioctl_compat_t *fn = NULL;
55 	int ret;
56 
57 	if (nr < DRM_COMMAND_BASE)
58 		return drm_compat_ioctl(filp, cmd, arg);
59 
60 #if 0
61 	if (nr < DRM_COMMAND_BASE + DRM_ARRAY_SIZE(mga_compat_ioctls))
62 		fn = nouveau_compat_ioctls[nr - DRM_COMMAND_BASE];
63 #endif
64 	if (fn != NULL)
65 		ret = (*fn)(filp, cmd, arg);
66 	else
67 		ret = drm_ioctl(filp, cmd, arg);
68 
69 	return ret;
70 }
71