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bootinfo.c revision 1.3 
      1 /*	$NetBSD: bootinfo.c,v 1.3 2008/01/26 14:35:25 tsutsui Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1999 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Jonathan Stone, Michael Hitch and Simon Burge.
      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 <machine/types.h>
     40 #include <lib/libsa/stand.h>
     41 #include <lib/libkern/libkern.h>
     42 
     43 #include "bootinfo.h"
     44 
     45 struct btinfo_common *bootinfo;		/* bootinfo address */
     46 
     47 static char *bi_next;			/* pointer to next bootinfo data */
     48 static int bi_size;			/* current bootinfo size */
     49 
     50 void
     51 bi_init(void *bi_addr)
     52 {
     53 	struct btinfo_magic bi_magic;
     54 
     55 	bootinfo = bi_addr;
     56 	bootinfo->next = 0;
     57 	bootinfo->type = BTINFO_NONE;
     58 
     59 	bi_next = (void *)bootinfo;
     60 	bi_size = 0;
     61 
     62 	bi_magic.magic = BOOTINFO_MAGIC;
     63 	bi_add(&bi_magic, BTINFO_MAGIC, sizeof(bi_magic));
     64 }
     65 
     66 void
     67 bi_add(void *new, int type, size_t size)
     68 {
     69 	struct btinfo_common *bi;
     70 
     71 	if (bi_size + size > BOOTINFO_SIZE)
     72 		return;		/* XXX should report error? */
     73 
     74 	bi_size += size;
     75 
     76 	/* register new bootinfo data */
     77 	memcpy(bi_next, new, size);
     78 	bi = (void *)bi_next;
     79 	bi->next = size;
     80 	bi->type = type;
     81 
     82 	/* update pointer to next bootinfo data */
     83 	bi_next += size;
     84 	bi = (void *)bi_next;
     85 	bi->next = 0;
     86 	bi->type = BTINFO_NONE;
     87 }
     88