config root man

/*-
 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/boot/i386/libi386/i386_copy.c 153589 2005-12-21 02:17:58Z sobomax $");

/*
 * MD primitives supporting placement of module data 
 *
 * XXX should check load address/size against memory top.
 */
#include <stand.h>

#include "libi386.h"
#include "btxv86.h"

ssize_t
i386_copyin(const void *src, vm_offset_t dest, const size_t len)
{
    if (dest + len >= memtop) {
	errno = EFBIG;
	return(-1);
    }

    bcopy(src, PTOV(dest), len);
    return(len);
}

ssize_t
i386_copyout(const vm_offset_t src, void *dest, const size_t len)
{
    if (src + len >= memtop) {
	errno = EFBIG;
	return(-1);
    }
    
    bcopy(PTOV(src), dest, len);
    return(len);
}


ssize_t
i386_readin(const int fd, vm_offset_t dest, const size_t len)
{

    if (dest + len >= memtop_copyin) {
	errno = EFBIG;
	return(-1);
    }

    return (read(fd, PTOV(dest), len));
}