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      1 /*	$NetBSD: bootinfo.c,v 1.4 2008/04/28 20:23:13 martin 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  *
     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 <machine/types.h>
     33 #include <lib/libsa/stand.h>
     34 #include <lib/libkern/libkern.h>
     35 
     36 #include "bootinfo.h"
     37 
     38 struct btinfo_common *bootinfo;		/* bootinfo address */
     39 
     40 static char *bi_next;			/* pointer to next bootinfo data */
     41 static int bi_size;			/* current bootinfo size */
     42 
     43 void
     44 bi_init(void *bi_addr)
     45 {
     46 	struct btinfo_magic bi_magic;
     47 
     48 	bootinfo = bi_addr;
     49 	bootinfo->next = 0;
     50 	bootinfo->type = BTINFO_NONE;
     51 
     52 	bi_next = (void *)bootinfo;
     53 	bi_size = 0;
     54 
     55 	bi_magic.magic = BOOTINFO_MAGIC;
     56 	bi_add(&bi_magic, BTINFO_MAGIC, sizeof(bi_magic));
     57 }
     58 
     59 void
     60 bi_add(void *new, int type, size_t size)
     61 {
     62 	struct btinfo_common *bi;
     63 
     64 	if (bi_size + size > BOOTINFO_SIZE)
     65 		return;		/* XXX should report error? */
     66 
     67 	bi_size += size;
     68 
     69 	/* register new bootinfo data */
     70 	memcpy(bi_next, new, size);
     71 	bi = (void *)bi_next;
     72 	bi->next = size;
     73 	bi->type = type;
     74 
     75 	/* update pointer to next bootinfo data */
     76 	bi_next += size;
     77 	bi = (void *)bi_next;
     78 	bi->next = 0;
     79 	bi->type = BTINFO_NONE;
     80 }
     81