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/**
* \file drm_init.h
* Setup/Cleanup for DRM
*
* \author Rickard E. (Rik) Faith <faith@valinux.com>
* \author Gareth Hughes <gareth@valinux.com>
*/
/*
* 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.
*/
#include "drmP.h"
/** Debug flags. Set by parse_option(). */
#if 0
int drm_flags = DRM_FLAG_DEBUG;
#else
int drm_flags = 0;
#endif
EXPORT_SYMBOL(drm_flags);
/**
* Parse a single option.
*
* \param s option string.
*
* \sa See 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, "debug")) {
drm_flags |= DRM_FLAG_DEBUG;
DRM_INFO("Debug messages ON\n");
return;
}
DRM_ERROR("\"%s\" is not a valid option\n", s);
return;
}
/**
* Parse the insmod "drm_opts=" options, or the command-line
* options passed to the kernel via LILO.
*
* \param s contains option_list without the 'drm_opts=' part.
*
* The grammar of the format is as
* follows:
*
* \code
* drm ::= 'drm_opts=' option_list
* option_list ::= option [ ';' option_list ]
* option ::= 'device:' major
* | 'debug'
* | 'noctx'
* major ::= INTEGER
* \endcode
*
* - 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
*
* \todo Actually only the \e presence of the 'debug' option is currently
* checked.
*/
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 */
}
}
/**
* Check whether DRI will run on this CPU.
*
* \return non-zero if the DRI will run on this CPU, or zero 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;
}
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