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      1 /*	$NetBSD: inkernel.c,v 1.9 2009/03/18 10:22:27 cegger Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1996, 1997 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Kazuki Sakamoto.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <lib/libsa/stand.h>
     33 #include <sys/param.h>
     34 #include "boot.h"
     35 #include "magic.h"
     36 
     37 #define	KERNENTRY	(RELOC - 0x200000)
     38 
     39 int inopen(struct open_file *);
     40 int inclose(struct open_file *);
     41 int instrategy(void *, int, daddr_t, size_t, void *, size_t *);
     42 
     43 void
     44 init_in(void)
     45 {
     46 	int p;
     47 
     48 	for (p = endaddr(); p < KERNENTRY; p += sizeof (int)) {
     49 		if (*(int *)p != BEBOX_ENTRY ||
     50 		    *(int *)(p + sizeof (int)) != 0 ||
     51 		    *(int *)(p + sizeof (int) * 2) != 0)
     52 			continue;
     53 
     54 		p += sizeof (int) * 3;
     55 		if (memcmp((char *)p, bebox_magic, BEBOX_MAGICSIZE) == 0) {
     56 			kern_len = *(int *)(p + BEBOX_MAGICSIZE);
     57 			memcpy((char *)KERNENTRY,
     58 				(char *)(p + BEBOX_MAGICSIZE + KERNLENSIZE),
     59 				kern_len);
     60 			break;
     61 		}
     62 	}
     63 }
     64 
     65 int
     66 inopen(struct open_file *p)
     67 {
     68 
     69 	if (kern_len)
     70 		return (0);
     71 	return (EINVAL);
     72 }
     73 
     74 int
     75 inclose(struct open_file *p)
     76 {
     77 
     78 	return (0);
     79 }
     80 
     81 int
     82 instrategy(void *devdata, int func, daddr_t blk, size_t size, void *buf,
     83 	   size_t *rsize)
     84 {
     85 
     86 	memcpy(buf, (char *)KERNENTRY + blk * DEV_BSIZE, size);
     87 	*rsize = size;
     88 	return (0);
     89 }
     90