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Annotation of sys/dev/acpi/acpiutil.c, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: acpiutil.c,v 1.3 2006/12/19 23:01:47 deraadt 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: }