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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

 *

 * 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;

}