1 /* init.c -- Setup/Cleanup for DRM -*- linux-c -*-
2 * Created: Mon Jan 4 08:58:31 1999 by faith@precisioninsight.com
3 *
4 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
5 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
6 * All Rights Reserved.
7 *
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:
14 *
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
17 * Software.
18 *
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 * PRECISION INSIGHT 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 OTHER
25 * DEALINGS IN THE SOFTWARE.
26 *
27 * Authors:
28 * Rickard E. (Rik) Faith <faith@valinux.com>
29 *
30 */
31
32 #define __NO_VERSION__
33 #include "drmP.h"
34
35 int drm_flags = 0;
36
37 /* drm_parse_option parses a single option. See description for
38 drm_parse_options for details. */
39
drm_parse_option(char * s)40 static void drm_parse_option(char *s)
41 {
42 char *c, *r;
43
44 DRM_DEBUG("\"%s\"\n", s);
45 if (!s || !*s) return;
46 for (c = s; *c && *c != ':'; c++); /* find : or \0 */
47 if (*c) r = c + 1; else r = NULL; /* remember remainder */
48 *c = '\0'; /* terminate */
49 if (!strcmp(s, "noctx")) {
50 drm_flags |= DRM_FLAG_NOCTX;
51 DRM_INFO("Server-mediated context switching OFF\n");
52 return;
53 }
54 if (!strcmp(s, "debug")) {
55 drm_flags |= DRM_FLAG_DEBUG;
56 DRM_INFO("Debug messages ON\n");
57 return;
58 }
59 DRM_ERROR("\"%s\" is not a valid option\n", s);
60 return;
61 }
62
63 /* drm_parse_options parse the insmod "drm=" options, or the command-line
64 * options passed to the kernel via LILO. The grammar of the format is as
65 * follows:
66 *
67 * drm ::= 'drm=' option_list
68 * option_list ::= option [ ';' option_list ]
69 * option ::= 'device:' major
70 * | 'debug'
71 * | 'noctx'
72 * major ::= INTEGER
73 *
74 * Note that 's' contains option_list without the 'drm=' part.
75 *
76 * device=major,minor specifies the device number used for /dev/drm
77 * if major == 0 then the misc device is used
78 * if major == 0 and minor == 0 then dynamic misc allocation is used
79 * debug=on specifies that debugging messages will be printk'd
80 * debug=trace specifies that each function call will be logged via printk
81 * debug=off turns off all debugging options
82 *
83 */
84
drm_parse_options(char * s)85 void drm_parse_options(char *s)
86 {
87 char *h, *t, *n;
88
89 DRM_DEBUG("\"%s\"\n", s ?: "");
90 if (!s || !*s) return;
91
92 for (h = t = n = s; h && *h; h = n) {
93 for (; *t && *t != ';'; t++); /* find ; or \0 */
94 if (*t) n = t + 1; else n = NULL; /* remember next */
95 *t = '\0'; /* terminate */
96 drm_parse_option(h); /* parse */
97 }
98 }
99
100 /* drm_cpu_valid returns non-zero if the DRI will run on this CPU, and 0
101 * otherwise. */
102
drm_cpu_valid(void)103 int drm_cpu_valid(void)
104 {
105 #if defined(__i386__)
106 if (boot_cpu_data.x86 == 3) return 0; /* No cmpxchg on a 386 */
107 #endif
108 #if defined(__sparc__) && !defined(__sparc_v9__)
109 if (1)
110 return 0; /* No cmpxchg before v9 sparc. */
111 #endif
112 return 1;
113 }
114