patch-2.4.18 linux/drivers/char/drm-4.0/init.c

• Lines: 114
• Date: Wed Jan 9 21:56:59 2002
• Orig file: linux.orig/drivers/char/drm-4.0/init.c
• Orig date: Thu Jan 1 00:00:00 1970

diff -Naur -X /home/marcelo/lib/dontdiff linux.orig/drivers/char/drm-4.0/init.c linux/drivers/char/drm-4.0/init.c
@@ -0,0 +1,113 @@
+/* init.c -- Setup/Cleanup for DRM -*- linux-c -*-
+ * Created: Mon Jan  4 08:58:31 1999 by faith@precisioninsight.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
+ * PRECISION INSIGHT 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>
+ *
+ */
+
+#define __NO_VERSION__
+#include "drmP.h"
+
+int			      drm_flags		= 0;
+
+/* drm_parse_option parses a single option.  See description for
+   drm_parse_options for details. */
+
+static void drm_parse_option(char *s)
+{
+	char *c, *r;
+	
+	DRM_DEBUG("\"%s\"\n", s);
+	if (!s || !*s) return;
+	for (c = s; *c && *c != ':'; c++); /* find : or \0 */
+	if (*c) r = c + 1; else r = NULL;  /* remember remainder */
+	*c = '\0';			   /* terminate */
+	if (!strcmp(s, "noctx")) {
+		drm_flags |= DRM_FLAG_NOCTX;
+		DRM_INFO("Server-mediated context switching OFF\n");
+		return;
+	}
+	if (!strcmp(s, "debug")) {
+		drm_flags |= DRM_FLAG_DEBUG;
+		DRM_INFO("Debug messages ON\n");
+		return;
+	}
+	DRM_ERROR("\"%s\" is not a valid option\n", s);
+	return;
+}
+
+/* drm_parse_options parse the insmod "drm=" options, or the command-line
+ * options passed to the kernel via LILO.  The grammar of the format is as
+ * follows:
+ *
+ * drm		::= 'drm=' option_list
+ * option_list	::= option [ ';' option_list ]
+ * option	::= 'device:' major
+ *		|   'debug' 
+ *		|   'noctx'
+ * major	::= INTEGER
+ *
+ * Note that 's' contains option_list without the 'drm=' part.
+ *
+ * device=major,minor specifies the device number used for /dev/drm
+ *	  if major == 0 then the misc device is used
+ *	  if major == 0 and minor == 0 then dynamic misc allocation is used
+ * debug=on specifies that debugging messages will be printk'd
+ * debug=trace specifies that each function call will be logged via printk
+ * debug=off turns off all debugging options
+ *
+ */
+
+void drm_parse_options(char *s)
+{
+	char *h, *t, *n;
+	
+	DRM_DEBUG("\"%s\"\n", s ?: "");
+	if (!s || !*s) return;
+
+	for (h = t = n = s; h && *h; h = n) {
+		for (; *t && *t != ';'; t++);	       /* find ; or \0 */
+		if (*t) n = t + 1; else n = NULL;      /* remember next */
+		*t = '\0';			       /* terminate */
+		drm_parse_option(h);		       /* parse */
+	}
+}
+
+/* drm_cpu_valid returns non-zero if the DRI will run on this CPU, and 0
+ * otherwise. */
+
+int drm_cpu_valid(void)
+{
+#if defined(__i386__)
+	if (boot_cpu_data.x86 == 3) return 0; /* No cmpxchg on a 386 */
+#endif
+#if defined(__sparc__) && !defined(__sparc_v9__)
+	if (1)
+		return 0; /* No cmpxchg before v9 sparc. */
+#endif
+	return 1;
+}