AMD64 - Refactor uio_resid and size_t assumptions.
[dragonfly.git] / sys / boot / pc32 / libi386 / i386_copy.c
CommitLineData
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1/*-
2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
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26 * $FreeBSD: src/sys/boot/i386/libi386/i386_copy.c,v 1.10 2003/08/25 23:28:31 obrien Exp $
27 * $DragonFly: src/sys/boot/pc32/libi386/i386_copy.c,v 1.3 2003/11/10 06:08:36 dillon Exp $
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28 */
29
30/*
31 * MD primitives supporting placement of module data
32 *
33 * XXX should check load address/size against memory top.
34 */
35#include <stand.h>
36
37#include "libi386.h"
38#include "btxv86.h"
39
40#define READIN_BUF (16 * 1024)
41
42ssize_t
43i386_copyin(const void *src, vm_offset_t dest, const size_t len)
44{
45 if (dest + len >= memtop) {
46 errno = EFBIG;
47 return(-1);
48 }
49
50 bcopy(src, PTOV(dest), len);
51 return(len);
52}
53
54ssize_t
55i386_copyout(const vm_offset_t src, void *dest, const size_t len)
56{
57 if (src + len >= memtop) {
58 errno = EFBIG;
59 return(-1);
60 }
61
62 bcopy(PTOV(src), dest, len);
63 return(len);
64}
65
66
67ssize_t
68i386_readin(const int fd, vm_offset_t dest, const size_t len)
69{
70 void *buf;
71 size_t resid, chunk, get;
72 ssize_t got;
73
74 if (dest + len >= memtop)
75 return(0);
76
77 chunk = min(READIN_BUF, len);
78 buf = malloc(chunk);
79 if (buf == NULL)
80 return(0);
81
82 for (resid = len; resid > 0; resid -= got, dest += got) {
e54488bb 83 get = szmin(chunk, resid);
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84 got = read(fd, buf, get);
85 if (got <= 0)
86 break;
87 bcopy(buf, PTOV(dest), (size_t)got);
88 }
89 free(buf);
90 return(len - resid);
91}