xref: /src/sys/arch/prep/stand/boot/inkernel.c

/*	$NetBSD: inkernel.c,v 1.1 2000/02/29 15:21:51 nonaka Exp $	*/

/*-
 * Copyright (c) 1996, 1997 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Kazuki Sakamoto.
 *
 * 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *        This product includes software developed by the NetBSD
 *        Foundation, Inc. and its contributors.
 * 4. Neither the name of The NetBSD Foundation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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 <lib/libsa/stand.h>
#include <sys/param.h>

#include "boot.h"
#include "magic.h"

#define	KERNENTRY	(RELOC - 0x200000)

#ifndef	HEAD_SIZE
#define	HEAD_SIZE	0
#endif

#ifndef	KERN_OFFSET
#define	KERN_OFFSET	0
#endif

u_long head_size = HEAD_SIZE;
u_long kern_offset = KERN_OFFSET;

void
init_in()
{
	extern u_long ladr;
	u_long p = ladr + kern_offset - head_size;

	if (memcmp((char *)p, magic, MAGICSIZE) == 0) {
		kern_len = *(int *)(p + MAGICSIZE);
		memcpy((char *)KERNENTRY,
			(char *)(p + MAGICSIZE + KERNLENSIZE),
			kern_len);
	} else
		printf("magic not found.\n");
}

int
inopen(p)
	struct open_file *p;
{

	if (kern_len)
		return (0);
	return (EINVAL);
}

int
inclose(p)
	struct open_file *p;
{
	return (0);
}

int
instrategy(devdata, func, blk, size, buf, rsize)
	void *devdata;	/* device uniq data */
	int func;	/* function (read or write) */
	daddr_t blk;	/* block number */
	size_t size;	/* request size in bytes */
	void *buf;	/* buffer */
	size_t *rsize;	/* bytes transferred */
{

	memcpy(buf, (char *)(KERNENTRY + blk * DEV_BSIZE), size);
	*rsize = size;
	return (0);
}