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inkernel.c revision 1.3 
      1 /*	$NetBSD: inkernel.c,v 1.3 2003/01/30 00:36:32 matt 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 <lib/libsa/stand.h>
     40 #include <sys/param.h>
     41 
     42 #include "boot.h"
     43 #include "magic.h"
     44 
     45 #define	KERNENTRY	(RELOC - 0x200000)
     46 
     47 #ifndef	HEAD_SIZE
     48 #define	HEAD_SIZE	0
     49 #endif
     50 
     51 #ifndef	KERN_OFFSET
     52 #define	KERN_OFFSET	0
     53 #endif
     54 
     55 u_long head_size = HEAD_SIZE;
     56 u_long kern_offset = KERN_OFFSET;
     57 
     58 void
     59 init_in()
     60 {
     61 	extern u_long ladr;
     62 	u_long p = ladr + kern_offset - head_size;
     63 
     64 	if (memcmp((char *)p, magic, MAGICSIZE) == 0) {
     65 		kern_len = *(int *)(p + MAGICSIZE);
     66 		memcpy((char *)KERNENTRY,
     67 			(char *)(p + MAGICSIZE + KERNLENSIZE),
     68 			kern_len);
     69 	} else
     70 		printf("magic not found.\n");
     71 }
     72 
     73 int
     74 inopen(p)
     75 	struct open_file *p;
     76 {
     77 
     78 	if (kern_len)
     79 		return (0);
     80 	return (EINVAL);
     81 }
     82 
     83 int
     84 inclose(p)
     85 	struct open_file *p;
     86 {
     87 	return (0);
     88 }
     89 
     90 int
     91 instrategy(devdata, func, blk, size, buf, rsize)
     92 	void *devdata;	/* device uniq data */
     93 	int func;	/* function (read or write) */
     94 	daddr_t blk;	/* block number */
     95 	size_t size;	/* request size in bytes */
     96 	void *buf;	/* buffer */
     97 	size_t *rsize;	/* bytes transferred */
     98 {
     99 
    100 	memcpy(buf, (char *)KERNENTRY + ((long)blk * DEV_BSIZE), size);
    101 	*rsize = size;
    102 	return (0);
    103 }
    104