patch-2.4.8 linux/drivers/char/drm/drm_auth.h

• Lines: 163
• Date: Fri Aug 10 18:14:41 2001
• Orig file: v2.4.7/linux/drivers/char/drm/drm_auth.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.7/linux/drivers/char/drm/drm_auth.h linux/drivers/char/drm/drm_auth.h
@@ -0,0 +1,162 @@
+/* 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>
+ */
+
+#define __NO_VERSION__
+#include "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	  = DRM(hash_magic)(magic);
+
+	down(&dev->struct_sem);
+	for (pt = dev->magiclist[hash].head; pt; pt = pt->next) {
+		if (pt->magic == magic) {
+			retval = pt->priv;
+			break;
+		}
+	}
+	up(&dev->struct_sem);
+	return retval;
+}
+
+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	     = DRM(alloc)(sizeof(*entry), DRM_MEM_MAGIC);
+	if (!entry) return -ENOMEM;
+	entry->magic = magic;
+	entry->priv  = priv;
+	entry->next  = NULL;
+
+	down(&dev->struct_sem);
+	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;
+	}
+	up(&dev->struct_sem);
+
+	return 0;
+}
+
+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);
+
+	down(&dev->struct_sem);
+	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;
+			}
+			up(&dev->struct_sem);
+			return 0;
+		}
+	}
+	up(&dev->struct_sem);
+
+	DRM(free)(pt, sizeof(*pt), DRM_MEM_MAGIC);
+
+	return -EINVAL;
+}
+
+int DRM(getmagic)(struct inode *inode, struct file *filp,
+		  unsigned int cmd, unsigned long arg)
+{
+	static drm_magic_t sequence = 0;
+	static spinlock_t  lock	    = SPIN_LOCK_UNLOCKED;
+	drm_file_t	   *priv    = filp->private_data;
+	drm_device_t	   *dev	    = priv->dev;
+	drm_auth_t	   auth;
+
+				/* Find unique magic */
+	if (priv->magic) {
+		auth.magic = priv->magic;
+	} else {
+		do {
+			spin_lock(&lock);
+			if (!sequence) ++sequence; /* reserve 0 */
+			auth.magic = sequence++;
+			spin_unlock(&lock);
+		} while (DRM(find_file)(dev, auth.magic));
+		priv->magic = auth.magic;
+		DRM(add_magic)(dev, priv, auth.magic);
+	}
+
+	DRM_DEBUG("%u\n", auth.magic);
+	if (copy_to_user((drm_auth_t *)arg, &auth, sizeof(auth)))
+		return -EFAULT;
+	return 0;
+}
+
+int DRM(authmagic)(struct inode *inode, struct file *filp,
+		   unsigned int cmd, unsigned long arg)
+{
+	drm_file_t	   *priv    = filp->private_data;
+	drm_device_t	   *dev	    = priv->dev;
+	drm_auth_t	   auth;
+	drm_file_t	   *file;
+
+	if (copy_from_user(&auth, (drm_auth_t *)arg, sizeof(auth)))
+		return -EFAULT;
+	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 -EINVAL;
+}