memutil.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2004 Mark R V Murray
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer
   12  *    in this position and unchanged.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
   18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD$");
   31 
   32 #include <sys/param.h>
   33 #include <sys/kernel.h>
   34 #include <sys/lock.h>
   35 #include <sys/malloc.h>
   36 #include <sys/memrange.h>
   37 #include <sys/rwlock.h>
   38 #include <sys/systm.h>
   39 
   40 static struct rwlock    mr_lock;
   41 
   42 /*
   43  * Implementation-neutral, kernel-callable functions for manipulating
   44  * memory range attributes.
   45  */
   46 void
   47 mem_range_init(void)
   48 {
   49 
   50         if (mem_range_softc.mr_op == NULL)
   51                 return;
   52         rw_init(&mr_lock, "memrange");
   53         mem_range_softc.mr_op->init(&mem_range_softc);
   54 }
   55 
   56 void
   57 mem_range_destroy(void)
   58 {
   59 
   60         if (mem_range_softc.mr_op == NULL)
   61                 return;
   62         rw_destroy(&mr_lock);
   63 }
   64 
   65 int
   66 mem_range_attr_get(struct mem_range_desc *mrd, int *arg)
   67 {
   68         int nd;
   69 
   70         if (mem_range_softc.mr_op == NULL)
   71                 return (EOPNOTSUPP);
   72         nd = *arg;
   73         rw_rlock(&mr_lock);
   74         if (nd == 0)
   75                 *arg = mem_range_softc.mr_ndesc;
   76         else
   77                 bcopy(mem_range_softc.mr_desc, mrd, nd * sizeof(*mrd));
   78         rw_runlock(&mr_lock);
   79         return (0);
   80 }
   81 
   82 int
   83 mem_range_attr_set(struct mem_range_desc *mrd, int *arg)
   84 {
   85         int ret;
   86 
   87         if (mem_range_softc.mr_op == NULL)
   88                 return (EOPNOTSUPP);
   89         rw_wlock(&mr_lock);
   90         ret = mem_range_softc.mr_op->set(&mem_range_softc, mrd, arg);
   91         rw_wunlock(&mr_lock);
   92         return (ret);
   93 }

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

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