| /* drm_init.h -- Setup/Cleanup for DRM -*- linux-c -*- |
| * Created: Mon Jan 4 08:58:31 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> |
| */ |
| |
| #include "drmP.h" |
| |
| #if 0 |
| int DRM(flags) = DRM_FLAG_DEBUG; |
| #else |
| int DRM(flags) = 0; |
| #endif |
| |
| /* 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_opts=" options, or the command-line |
| * options passed to the kernel via LILO. The grammar of the format is as |
| * follows: |
| * |
| * drm ::= 'drm_opts=' option_list |
| * option_list ::= option [ ';' option_list ] |
| * option ::= 'device:' major |
| * | 'debug' |
| * | 'noctx' |
| * major ::= INTEGER |
| * |
| * Note that 's' contains option_list without the 'drm_opts=' 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__) |
| return 0; /* No cmpxchg before v9 sparc. */ |
| #endif |
| return 1; |
| } |