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inkernel.c revision 1.1 
      1 /*	$Id: inkernel.c,v 1.1 1998/01/16 04:17:49 sakamoto 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  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 #include <sys/param.h>
     40 #include "stand.h"
     41 #include "magic.h"
     42 
     43 #define	KERNENTRY	(RELOC - 0x200000)
     44 
     45 init_in()
     46 {
     47 	int p;
     48 
     49 	for (p = endaddr(); p < KERNENTRY; p += sizeof (int)) {
     50 		if (*(int *)p != ENTRY ||
     51 		    *(int *)(p + sizeof (int)) != 0 ||
     52 		    *(int *)(p + sizeof (int) * 2) != 0)
     53 			continue;
     54 
     55 		p += sizeof (int) * 3;
     56 		if (bcmp((char *)p, magic, MAGICSIZE) == 0) {
     57 			kern_len = *(int *)(p + MAGICSIZE);
     58 			bcopy((char *)(p + MAGICSIZE + KERNLENSIZE),
     59 				(char *)KERNENTRY, kern_len);
     60 			break;
     61 		}
     62 	}
     63 }
     64 
     65 int
     66 inopen(p)
     67 	struct open_file *p;
     68 {
     69 	if (kern_len)
     70 		return (0);
     71 	return (EINVAL);
     72 }
     73 
     74 int
     75 inclose(p)
     76 	struct open_file *p;
     77 {
     78 	return (0);
     79 }
     80 
     81 int
     82 instrategy(devdata, func, blk, size, buf, rsize)
     83 	void *devdata;	/* device uniq data */
     84 	int func;	/* function (read or write) */
     85 	daddr_t blk;	/* block number */
     86 	size_t size;	/* request size in bytes */
     87 	void *buf;	/* buffer */
     88 	size_t *rsize;	/* bytes transferred */
     89 {
     90 
     91 	bcopy((char *)(KERNENTRY + blk * DEV_BSIZE), buf, size);
     92 	*rsize = size;
     93 	return (0);
     94 }
     95