diff options
Diffstat (limited to 'sys/dev/drm/drm_auth.c')
| -rw-r--r-- | sys/dev/drm/drm_auth.c | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/sys/dev/drm/drm_auth.c b/sys/dev/drm/drm_auth.c new file mode 100644 index 0000000..910c0b0 --- /dev/null +++ b/sys/dev/drm/drm_auth.c @@ -0,0 +1,173 @@ +/* drm_auth.h -- IOCTLs for authentication -*- linux-c -*- + * Created: Tue Feb 2 08:37:54 1999 by faith@valinux.com + */ +/*- + * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. + * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. + * All Rights Reserved. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + * OTHER DEALINGS IN THE SOFTWARE. + * + * Authors: + * Rickard E. (Rik) Faith <faith@valinux.com> + * Gareth Hughes <gareth@valinux.com> + * + * $FreeBSD$ + */ + +#include "dev/drm/drmP.h" + +static int drm_hash_magic(drm_magic_t magic) +{ + return magic & (DRM_HASH_SIZE-1); +} + +static drm_file_t *drm_find_file(drm_device_t *dev, drm_magic_t magic) +{ + drm_file_t *retval = NULL; + drm_magic_entry_t *pt; + int hash; + + hash = drm_hash_magic(magic); + + DRM_LOCK(); + for (pt = dev->magiclist[hash].head; pt; pt = pt->next) { + if (pt->magic == magic) { + retval = pt->priv; + break; + } + } + DRM_UNLOCK(); + return retval; +} + +static int drm_add_magic(drm_device_t *dev, drm_file_t *priv, drm_magic_t magic) +{ + int hash; + drm_magic_entry_t *entry; + + DRM_DEBUG("%d\n", magic); + + hash = drm_hash_magic(magic); + entry = malloc(sizeof(*entry), M_DRM, M_ZERO | M_NOWAIT); + if (!entry) return DRM_ERR(ENOMEM); + entry->magic = magic; + entry->priv = priv; + entry->next = NULL; + + DRM_LOCK(); + if (dev->magiclist[hash].tail) { + dev->magiclist[hash].tail->next = entry; + dev->magiclist[hash].tail = entry; + } else { + dev->magiclist[hash].head = entry; + dev->magiclist[hash].tail = entry; + } + DRM_UNLOCK(); + + return 0; +} + +static int drm_remove_magic(drm_device_t *dev, drm_magic_t magic) +{ + drm_magic_entry_t *prev = NULL; + drm_magic_entry_t *pt; + int hash; + + DRM_DEBUG("%d\n", magic); + hash = drm_hash_magic(magic); + + DRM_LOCK(); + for (pt = dev->magiclist[hash].head; pt; prev = pt, pt = pt->next) { + if (pt->magic == magic) { + if (dev->magiclist[hash].head == pt) { + dev->magiclist[hash].head = pt->next; + } + if (dev->magiclist[hash].tail == pt) { + dev->magiclist[hash].tail = prev; + } + if (prev) { + prev->next = pt->next; + } + DRM_UNLOCK(); + return 0; + } + } + DRM_UNLOCK(); + + free(pt, M_DRM); + return DRM_ERR(EINVAL); +} + +int drm_getmagic(DRM_IOCTL_ARGS) +{ + DRM_DEVICE; + static drm_magic_t sequence = 0; + drm_auth_t auth; + drm_file_t *priv; + + DRM_LOCK(); + priv = drm_find_file_by_proc(dev, p); + DRM_UNLOCK(); + if (priv == NULL) { + DRM_ERROR("can't find authenticator\n"); + return EINVAL; + } + + /* Find unique magic */ + if (priv->magic) { + auth.magic = priv->magic; + } else { + do { + int old = sequence; + + auth.magic = old+1; + + if (!atomic_cmpset_int(&sequence, old, auth.magic)) + continue; + } while (drm_find_file(dev, auth.magic)); + priv->magic = auth.magic; + drm_add_magic(dev, priv, auth.magic); + } + + DRM_DEBUG("%u\n", auth.magic); + + DRM_COPY_TO_USER_IOCTL((drm_auth_t *)data, auth, sizeof(auth)); + + return 0; +} + +int drm_authmagic(DRM_IOCTL_ARGS) +{ + drm_auth_t auth; + drm_file_t *file; + DRM_DEVICE; + + DRM_COPY_FROM_USER_IOCTL(auth, (drm_auth_t *)data, sizeof(auth)); + + DRM_DEBUG("%u\n", auth.magic); + + if ((file = drm_find_file(dev, auth.magic))) { + file->authenticated = 1; + drm_remove_magic(dev, auth.magic); + return 0; + } + return DRM_ERR(EINVAL); +} |
