drm/linux-core/drm_init.c

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/* drm_init.h -- Setup/Cleanup for DRM -*- linux-c -*-
* Created: Mon Jan 4 08:58:31 1999 by faith@valinux.com
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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.
*
* 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:
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*
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* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
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*
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* 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
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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
* OTHER DEALINGS IN THE SOFTWARE.
*
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* Authors:
* Rickard E. (Rik) Faith <faith@valinux.com>
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* Gareth Hughes <gareth@valinux.com>
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*/
#define __NO_VERSION__
#include "drmP.h"
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#if 0
int DRM(flags) = DRM_FLAG_DEBUG;
#else
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int DRM(flags) = 0;
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#endif
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/* drm_parse_option parses a single option. See description for
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* drm_parse_options for details.
*/
static void DRM(parse_option)(char *s)
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{
char *c, *r;
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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")) {
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DRM(flags) |= DRM_FLAG_DEBUG;
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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
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* options passed to the kernel via LILO. The grammar of the format is as
* follows:
*
* drm ::= 'drm_opts=' option_list
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* option_list ::= option [ ';' option_list ]
* option ::= 'device:' major
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* | 'debug'
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* | 'noctx'
* major ::= INTEGER
*
* Note that 's' contains option_list without the 'drm_opts=' part.
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*
* 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
*
*/
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void DRM(parse_options)(char *s)
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{
char *h, *t, *n;
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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 */
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DRM(parse_option)(h); /* parse */
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}
}
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/* drm_cpu_valid returns non-zero if the DRI will run on this CPU, and 0
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* otherwise.
*/
int DRM(cpu_valid)(void)
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{
#if defined(__i386__)
if (boot_cpu_data.x86 == 3) return 0; /* No cmpxchg on a 386 */
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#endif
#if defined(__sparc__) && !defined(__sparc_v9__)
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return 0; /* No cmpxchg before v9 sparc. */
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#endif
return 1;
}