memdev.c

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    1 /*-
    2  * Copyright (c) 2004 Mark R V Murray
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer
   10  *    in this position and unchanged.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
   16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   25  *
   26  */
   27 
   28 #include <sys/cdefs.h>
   29 __FBSDID("$FreeBSD: releng/10.0/sys/dev/mem/memdev.c 252841 2013-07-05 21:31:16Z jamie $");
   30 
   31 #include <sys/param.h>
   32 #include <sys/conf.h>
   33 #include <sys/fcntl.h>
   34 #include <sys/kernel.h>
   35 #include <sys/lock.h>
   36 #include <sys/malloc.h>
   37 #include <sys/memrange.h>
   38 #include <sys/module.h>
   39 #include <sys/mutex.h>
   40 #include <sys/priv.h>
   41 #include <sys/proc.h>
   42 #include <sys/signalvar.h>
   43 #include <sys/systm.h>
   44 #include <sys/uio.h>
   45 
   46 #include <vm/vm.h>
   47 #include <vm/pmap.h>
   48 
   49 #include <machine/memdev.h>
   50 
   51 static struct cdev *memdev, *kmemdev;
   52 
   53 static struct cdevsw mem_cdevsw = {
   54         .d_version =    D_VERSION,
   55         .d_flags =      D_MEM|D_NEEDGIANT,
   56         .d_open =       memopen,
   57         .d_read =       memrw,
   58         .d_write =      memrw,
   59         .d_ioctl =      memioctl,
   60         .d_mmap =       memmmap,
   61         .d_name =       "mem",
   62 };
   63 
   64 /* ARGSUSED */
   65 int
   66 memopen(struct cdev *dev __unused, int flags, int fmt __unused,
   67     struct thread *td)
   68 {
   69         int error = 0;
   70 
   71         if (flags & FREAD)
   72                 error = priv_check(td, PRIV_KMEM_READ);
   73         if (flags & FWRITE) {
   74                 if (error == 0)
   75                         error = priv_check(td, PRIV_KMEM_WRITE);
   76                 if (error == 0)
   77                         error = securelevel_gt(td->td_ucred, 0);
   78         }
   79 
   80         return (error);
   81 }
   82 
   83 /* ARGSUSED */
   84 static int
   85 mem_modevent(module_t mod __unused, int type, void *data __unused)
   86 {
   87         switch(type) {
   88         case MOD_LOAD:
   89                 if (bootverbose)
   90                         printf("mem: <memory>\n");
   91                 mem_range_init();
   92                 memdev = make_dev(&mem_cdevsw, CDEV_MINOR_MEM,
   93                         UID_ROOT, GID_KMEM, 0640, "mem");
   94                 kmemdev = make_dev(&mem_cdevsw, CDEV_MINOR_KMEM,
   95                         UID_ROOT, GID_KMEM, 0640, "kmem");
   96                 break;
   97 
   98         case MOD_UNLOAD:
   99                 mem_range_destroy();
  100                 destroy_dev(memdev);
  101                 destroy_dev(kmemdev);
  102                 break;
  103 
  104         case MOD_SHUTDOWN:
  105                 break;
  106 
  107         default:
  108                 return(EOPNOTSUPP);
  109 
  110         }
  111 
  112         return (0);
  113 }
  114 
  115 DEV_MODULE(mem, mem_modevent, NULL);
  116 MODULE_VERSION(mem, 1);

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FreeBSD/Linux Kernel Cross Reference sys/dev/mem/memdev.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/mem/memdev.c