i386_copy.c revision 55211
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 55211 1999-12-29 09:54:46Z msmith $ 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 41int 42i386_copyin(void *src, vm_offset_t dest, 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 53int 54i386_copyout(vm_offset_t src, void *dest, 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 66int 67i386_readin(int fd, vm_offset_t dest, 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), got); 87 } 88 free(buf); 89 return(len - resid); 90} 91 92 93