129 lines
3.7 KiB
C
129 lines
3.7 KiB
C
/**
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* \file drm_init.h
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* Setup/Cleanup for DRM
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*
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* \author Rickard E. (Rik) Faith <faith@valinux.com>
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* \author Gareth Hughes <gareth@valinux.com>
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*/
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/*
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* Created: Mon Jan 4 08:58:31 1999 by faith@valinux.com
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*
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* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
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* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include "drmP.h"
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/** Debug flags. Set by parse_option(). */
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#if 0
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int DRM(flags) = DRM_FLAG_DEBUG;
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#else
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int DRM(flags) = 0;
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#endif
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/**
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* Parse a single option.
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*
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* \param s option string.
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*
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* \sa See parse_options() for details.
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*/
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static void DRM(parse_option)(char *s)
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{
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char *c, *r;
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DRM_DEBUG("\"%s\"\n", s);
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if (!s || !*s) return;
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for (c = s; *c && *c != ':'; c++); /* find : or \0 */
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if (*c) r = c + 1; else r = NULL; /* remember remainder */
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*c = '\0'; /* terminate */
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if (!strcmp(s, "debug")) {
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DRM(flags) |= DRM_FLAG_DEBUG;
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DRM_INFO("Debug messages ON\n");
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return;
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}
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DRM_ERROR("\"%s\" is not a valid option\n", s);
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return;
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}
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/**
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* Parse the insmod "drm_opts=" options, or the command-line
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* options passed to the kernel via LILO.
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*
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* \param s contains option_list without the 'drm_opts=' part.
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*
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* The grammar of the format is as
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* follows:
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*
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* \code
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* drm ::= 'drm_opts=' option_list
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* option_list ::= option [ ';' option_list ]
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* option ::= 'device:' major
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* | 'debug'
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* | 'noctx'
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* major ::= INTEGER
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* \endcode
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*
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* - device=major,minor specifies the device number used for /dev/drm
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* - if major == 0 then the misc device is used
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* - if major == 0 and minor == 0 then dynamic misc allocation is used
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* - debug=on specifies that debugging messages will be printk'd
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* - debug=trace specifies that each function call will be logged via printk
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* - debug=off turns off all debugging options
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*
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* \todo Actually only the \e presence of the 'debug' option is currently
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* checked.
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*/
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void DRM(parse_options)(char *s)
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{
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char *h, *t, *n;
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DRM_DEBUG("\"%s\"\n", s ?: "");
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if (!s || !*s) return;
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for (h = t = n = s; h && *h; h = n) {
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for (; *t && *t != ';'; t++); /* find ; or \0 */
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if (*t) n = t + 1; else n = NULL; /* remember next */
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*t = '\0'; /* terminate */
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DRM(parse_option)(h); /* parse */
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}
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}
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/**
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* Check whether DRI will run on this CPU.
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*
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* \return non-zero if the DRI will run on this CPU, or zero otherwise.
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*/
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int DRM(cpu_valid)(void)
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{
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#if defined(__i386__)
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if (boot_cpu_data.x86 == 3) return 0; /* No cmpxchg on a 386 */
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#endif
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#if defined(__sparc__) && !defined(__sparc_v9__)
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return 0; /* No cmpxchg before v9 sparc. */
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#endif
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return 1;
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}
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