1 /* $OpenBSD: acpiutil.c,v 1.4 2008/06/11 04:42:09 marco 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 <machine/bus.h> 23 24 #include <dev/acpi/acpireg.h> 25 #include <dev/acpi/acpivar.h> 26 27 u_int 28 acpi_checksum(const void *v, size_t len) 29 { 30 const u_char *p = v; 31 u_char s = 0; 32 int i; 33 34 for (i = 0; i < len; i++) 35 s += p[i]; 36 37 if (s) 38 printf("acpi: bad checksum at %p\n", v); 39 return (s); 40 } 41