1 /* drm_auth.h -- IOCTLs for authentication -*- linux-c -*-
2 * Created: Tue Feb 2 08:37:54 1999 by faith@valinux.com
4 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
5 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
8 * Permission is hereby granted, free of charge, to any person obtaining a
9 * copy of this software and associated documentation files (the "Software"),
10 * to deal in the Software without restriction, including without limitation
11 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
12 * and/or sell copies of the Software, and to permit persons to whom the
13 * Software is furnished to do so, subject to the following conditions:
15 * The above copyright notice and this permission notice (including the next
16 * paragraph) shall be included in all copies or substantial portions of the
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
23 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
24 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
25 * OTHER DEALINGS IN THE SOFTWARE.
28 * Rickard E. (Rik) Faith <faith@valinux.com>
29 * Gareth Hughes <gareth@valinux.com>
30 * $FreeBSD: src/sys/dev/drm/drm_auth.h,v 1.3.2.1 2003/04/26 07:05:28 anholt Exp $
31 * $DragonFly: src/sys/dev/drm/Attic/drm_auth.h,v 1.2 2003/06/17 04:28:24 dillon Exp $
34 #include "dev/drm/drmP.h"
36 static int DRM(hash_magic)(drm_magic_t magic)
38 return magic & (DRM_HASH_SIZE-1);
41 static drm_file_t *DRM(find_file)(drm_device_t *dev, drm_magic_t magic)
43 drm_file_t *retval = NULL;
44 drm_magic_entry_t *pt;
45 int hash = DRM(hash_magic)(magic);
48 for (pt = dev->magiclist[hash].head; pt; pt = pt->next) {
49 if (pt->magic == magic) {
58 int DRM(add_magic)(drm_device_t *dev, drm_file_t *priv, drm_magic_t magic)
61 drm_magic_entry_t *entry;
63 DRM_DEBUG("%d\n", magic);
65 hash = DRM(hash_magic)(magic);
66 entry = (drm_magic_entry_t*) DRM(alloc)(sizeof(*entry), DRM_MEM_MAGIC);
67 if (!entry) return DRM_ERR(ENOMEM);
68 memset(entry, 0, sizeof(*entry));
74 if (dev->magiclist[hash].tail) {
75 dev->magiclist[hash].tail->next = entry;
76 dev->magiclist[hash].tail = entry;
78 dev->magiclist[hash].head = entry;
79 dev->magiclist[hash].tail = entry;
86 int DRM(remove_magic)(drm_device_t *dev, drm_magic_t magic)
88 drm_magic_entry_t *prev = NULL;
89 drm_magic_entry_t *pt;
92 DRM_DEBUG("%d\n", magic);
93 hash = DRM(hash_magic)(magic);
96 for (pt = dev->magiclist[hash].head; pt; prev = pt, pt = pt->next) {
97 if (pt->magic == magic) {
98 if (dev->magiclist[hash].head == pt) {
99 dev->magiclist[hash].head = pt->next;
101 if (dev->magiclist[hash].tail == pt) {
102 dev->magiclist[hash].tail = prev;
105 prev->next = pt->next;
113 DRM(free)(pt, sizeof(*pt), DRM_MEM_MAGIC);
114 return DRM_ERR(EINVAL);
117 int DRM(getmagic)(DRM_IOCTL_ARGS)
119 static drm_magic_t sequence = 0;
124 /* Find unique magic */
126 auth.magic = priv->magic;
133 if (!atomic_cmpset_int(&sequence, old, auth.magic))
135 } while (DRM(find_file)(dev, auth.magic));
136 priv->magic = auth.magic;
137 DRM(add_magic)(dev, priv, auth.magic);
140 DRM_DEBUG("%u\n", auth.magic);
142 DRM_COPY_TO_USER_IOCTL((drm_auth_t *)data, auth, sizeof(auth));
147 int DRM(authmagic)(DRM_IOCTL_ARGS)
153 DRM_COPY_FROM_USER_IOCTL(auth, (drm_auth_t *)data, sizeof(auth));
155 DRM_DEBUG("%u\n", auth.magic);
156 if ((file = DRM(find_file)(dev, auth.magic))) {
157 file->authenticated = 1;
158 DRM(remove_magic)(dev, auth.magic);
161 return DRM_ERR(EINVAL);