Line data    Source code

       1             : /* $OpenBSD: acpiutil.c,v 1.8 2015/03/14 03:38:47 jsg Exp $ */
       2             : /*
       3             :  * Copyright (c) 2005 Thorsten Lockert <tholo@sigmasoft.com>
       4             :  *
       5             :  * Permission to use, copy, modify, and distribute this software for any
       6             :  * purpose with or without fee is hereby granted, provided that the above
       7             :  * copyright notice and this permission notice appear in all copies.
       8             :  *
       9             :  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
      10             :  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
      11             :  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
      12             :  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
      13             :  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
      14             :  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
      15             :  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
      16             :  */
      17             : 
      18             : #include <sys/types.h>
      19             : #include <sys/systm.h>
      20             : #include <sys/device.h>
      21             : 
      22             : #include <dev/acpi/acpivar.h>
      23             : 
      24             : u_int
      25           0 : acpi_checksum(const void *v, size_t len)
      26             : {
      27             :         const u_char *p = v;
      28             :         u_char s = 0;
      29             :         int i;
      30             : 
      31           0 :         for (i = 0; i < len; i++)
      32           0 :                 s += p[i];
      33             : 
      34             :         if (s)
      35             :                 dnprintf(0,"\nacpi0: bad checksum at %p", v);
      36             : 
      37           0 :         return (s);
      38             : }