Annotation of sys/arch/mvme88k/dev/memdevs.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: memdevs.c,v 1.5 2003/10/05 20:27:48 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 <mvme88k/dev/memdevs.h>
40:
41: /*ARGSUSED*/
42: int
43: memdevrw(base, len, uio, flags)
44: caddr_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(base + v, c, uio);
71: }
72: return (error);
73: }
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