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Annotation of sys/arch/mvme68k/dev/memdevs.c, Revision 1.1.1.1

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: }