i386_copy.c revision 64187 
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 *
26 * $FreeBSD: head/sys/boot/i386/libi386/i386_copy.c 64187 2000-08-03 09:14:02Z jhb $
27 */
28
29/*
30 * MD primitives supporting placement of module data
31 *
32 * XXX should check load address/size against memory top.
33 */
34#include <stand.h>
35
36#include "libi386.h"
37#include "btxv86.h"
38
39#define READIN_BUF	(16 * 1024)
40
41ssize_t
42i386_copyin(const void *src, vm_offset_t dest, const size_t len)
43{
44    if (dest + len >= memtop) {
45	errno = EFBIG;
46	return(-1);
47    }
48
49    bcopy(src, PTOV(dest), len);
50    return(len);
51}
52
53ssize_t
54i386_copyout(const vm_offset_t src, void *dest, const size_t len)
55{
56    if (src + len >= memtop) {
57	errno = EFBIG;
58	return(-1);
59    }
60
61    bcopy(PTOV(src), dest, len);
62    return(len);
63}
64
65
66ssize_t
67i386_readin(const int fd, vm_offset_t dest, const size_t len)
68{
69    void	*buf;
70    size_t	resid, chunk, get;
71    ssize_t	got;
72
73    if (dest + len >= memtop)
74	return(0);
75
76    chunk = min(READIN_BUF, len);
77    buf = malloc(chunk);
78    if (buf == NULL)
79	return(0);
80
81    for (resid = len; resid > 0; resid -= got, dest += got) {
82	get = min(chunk, resid);
83	got = read(fd, buf, get);
84	if (got <= 0)
85	    break;
86	bcopy(buf, PTOV(dest), (size_t)got);
87    }
88    free(buf);
89    return(len - resid);
90}
91