memutil.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 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD$");
   29 
   30 #include <sys/param.h>
   31 #include <sys/kernel.h>
   32 #include <sys/lock.h>
   33 #include <sys/malloc.h>
   34 #include <sys/memrange.h>
   35 #include <sys/rwlock.h>
   36 #include <sys/systm.h>
   37 
   38 static struct rwlock    mr_lock;
   39 
   40 /*
   41  * Implementation-neutral, kernel-callable functions for manipulating
   42  * memory range attributes.
   43  */
   44 void
   45 mem_range_init(void)
   46 {
   47 
   48         if (mem_range_softc.mr_op == NULL)
   49                 return;
   50         rw_init(&mr_lock, "memrange");
   51         mem_range_softc.mr_op->init(&mem_range_softc);
   52 }
   53 
   54 void
   55 mem_range_destroy(void)
   56 {
   57 
   58         if (mem_range_softc.mr_op == NULL)
   59                 return;
   60         rw_destroy(&mr_lock);
   61 }
   62 
   63 int
   64 mem_range_attr_get(struct mem_range_desc *mrd, int *arg)
   65 {
   66         int nd;
   67 
   68         if (mem_range_softc.mr_op == NULL)
   69                 return (EOPNOTSUPP);
   70         nd = *arg;
   71         rw_rlock(&mr_lock);
   72         if (nd == 0)
   73                 *arg = mem_range_softc.mr_ndesc;
   74         else
   75                 bcopy(mem_range_softc.mr_desc, mrd, nd * sizeof(*mrd));
   76         rw_runlock(&mr_lock);
   77         return (0);
   78 }
   79 
   80 int
   81 mem_range_attr_set(struct mem_range_desc *mrd, int *arg)
   82 {
   83         int ret;
   84 
   85         if (mem_range_softc.mr_op == NULL)
   86                 return (EOPNOTSUPP);
   87         rw_wlock(&mr_lock);
   88         ret = mem_range_softc.mr_op->set(&mem_range_softc, mrd, arg);
   89         rw_wunlock(&mr_lock);
   90         return (ret);
   91 }

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

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