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Annotation of sys/arch/mvme68k/dev/memdevs.c, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: memdevs.c,v 1.6 2005/11/24 22:43:16 miod Exp $ */
        !             2:
        !             3: /*
        !             4:  * Copyright (c) 1995 Theo de Raadt
        !             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:  * 2. Redistributions in binary form must reproduce the above copyright
        !            13:  *    notice, this list of conditions and the following disclaimer in the
        !            14:  *    documentation and/or other materials provided with the distribution.
        !            15:  *
        !            16:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
        !            17:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
        !            18:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
        !            19:  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
        !            20:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
        !            21:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
        !            22:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
        !            23:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
        !            24:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
        !            25:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
        !            26:  */
        !            27:
        !            28: #include <sys/param.h>
        !            29: #include <sys/conf.h>
        !            30: #include <sys/buf.h>
        !            31: #include <sys/systm.h>
        !            32: #include <sys/uio.h>
        !            33: #include <sys/malloc.h>
        !            34: #include <sys/device.h>
        !            35:
        !            36: #include <machine/autoconf.h>
        !            37: #include <machine/cpu.h>
        !            38:
        !            39: #include <mvme68k/dev/memdevs.h>
        !            40:
        !            41: /*ARGSUSED*/
        !            42: int
        !            43: memdevrw(base, len, uio, flags)
        !            44:        vaddr_t base;
        !            45:        int len;
        !            46:        struct uio *uio;
        !            47:        int flags;
        !            48: {
        !            49:        vaddr_t v;
        !            50:        int c;
        !            51:        struct iovec *iov;
        !            52:        int error = 0;
        !            53:
        !            54:        while (uio->uio_resid > 0 && error == 0) {
        !            55:                iov = uio->uio_iov;
        !            56:                if (iov->iov_len == 0) {
        !            57:                        uio->uio_iov++;
        !            58:                        uio->uio_iovcnt--;
        !            59:                        if (uio->uio_iovcnt < 0)
        !            60:                                panic("memdevrw");
        !            61:                        continue;
        !            62:                }
        !            63:
        !            64:                v = uio->uio_offset;
        !            65:                c = min(iov->iov_len, MAXPHYS);
        !            66:                if (v + c > len)
        !            67:                        c = len - v;    /* till end of dev */
        !            68:                if (c == 0)
        !            69:                        return (0);
        !            70:                error = uiomove((caddr_t)base + v, c, uio);
        !            71:        }
        !            72:        return (error);
        !            73: }