FreeBSD/Linux Kernel Cross Reference
sys/dev/drm/drm_init.h

     /* 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>
     *
     * $FreeBSD: releng/5.0/sys/dev/drm/drm_init.h 95584 2002-04-27 20:47:57Z anholt $
     */
    
    #define __NO_VERSION__
    #include "dev/drm/drmP.h"
    
    #if 1 && DRM_DEBUG_CODE
    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)
   {
   #ifdef __linux__
   #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
   #endif /* __linux__ */
           return 1;
   }

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