1 /* drm_init.h -- Setup/Cleanup for DRM -*- linux-c -*-
2 * Created: Mon Jan 4 08:58:31 1999 by faith@valinux.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 * 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.
26 *
27 * Authors:
28 * Rickard E. (Rik) Faith <faith@valinux.com>
29 * Gareth Hughes <gareth@valinux.com>
30 */
31
32 #include "drmP.h"
33
34 #if 0
35 int DRM(flags) = DRM_FLAG_DEBUG;
36 #else
37 int DRM(flags) = 0;
38 #endif
39
40 /* drm_parse_option parses a single option. See description for
41 * drm_parse_options for details.
42 */
DRM(parse_option)43 static void DRM(parse_option)(char *s)
44 {
45 char *c, *r;
46
47 DRM_DEBUG("\"%s\"\n", s);
48 if (!s || !*s) return;
49 for (c = s; *c && *c != ':'; c++); /* find : or \0 */
50 if (*c) r = c + 1; else r = NULL; /* remember remainder */
51 *c = '\0'; /* terminate */
52 if (!strcmp(s, "noctx")) {
53 DRM(flags) |= DRM_FLAG_NOCTX;
54 DRM_INFO("Server-mediated context switching OFF\n");
55 return;
56 }
57 if (!strcmp(s, "debug")) {
58 DRM(flags) |= DRM_FLAG_DEBUG;
59 DRM_INFO("Debug messages ON\n");
60 return;
61 }
62 DRM_ERROR("\"%s\" is not a valid option\n", s);
63 return;
64 }
65
66 /* drm_parse_options parse the insmod "drm_opts=" options, or the command-line
67 * options passed to the kernel via LILO. The grammar of the format is as
68 * follows:
69 *
70 * drm ::= 'drm_opts=' option_list
71 * option_list ::= option [ ';' option_list ]
72 * option ::= 'device:' major
73 * | 'debug'
74 * | 'noctx'
75 * major ::= INTEGER
76 *
77 * Note that 's' contains option_list without the 'drm_opts=' part.
78 *
79 * device=major,minor specifies the device number used for /dev/drm
80 * if major == 0 then the misc device is used
81 * if major == 0 and minor == 0 then dynamic misc allocation is used
82 * debug=on specifies that debugging messages will be printk'd
83 * debug=trace specifies that each function call will be logged via printk
84 * debug=off turns off all debugging options
85 *
86 */
87
DRM(parse_options)88 void DRM(parse_options)(char *s)
89 {
90 char *h, *t, *n;
91
92 DRM_DEBUG("\"%s\"\n", s ?: "");
93 if (!s || !*s) return;
94
95 for (h = t = n = s; h && *h; h = n) {
96 for (; *t && *t != ';'; t++); /* find ; or \0 */
97 if (*t) n = t + 1; else n = NULL; /* remember next */
98 *t = '\0'; /* terminate */
99 DRM(parse_option)(h); /* parse */
100 }
101 }
102
103 /* drm_cpu_valid returns non-zero if the DRI will run on this CPU, and 0
104 * otherwise.
105 */
DRM(cpu_valid)106 int DRM(cpu_valid)(void)
107 {
108 #if defined(__i386__)
109 if (boot_cpu_data.x86 == 3) return 0; /* No cmpxchg on a 386 */
110 #endif
111 #if defined(__sparc__) && !defined(__sparc_v9__)
112 return 0; /* No cmpxchg before v9 sparc. */
113 #endif
114 return 1;
115 }
116