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bootinfo.c revision 1.1.144.1 
      1 /*	$NetBSD: bootinfo.c,v 1.1.144.1 2008/05/16 02:23:15 yamt 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 <sys/param.h>
     33 #include <machine/types.h>
     34 #include <lib/libsa/stand.h>
     35 #include <lib/libkern/libkern.h>
     36 
     37 #include "bootinfo.h"
     38 
     39 static char *bootinfo = NULL;
     40 static char *bi_next;
     41 static int bi_size;
     42 
     43 u_long
     44 bi_init(addr)
     45 	u_long addr;
     46 {
     47 	struct btinfo_common *bi;
     48 	struct btinfo_magic bi_magic;
     49 	u_long *endp;
     50 
     51 	endp = (u_long *)ALIGN(addr);
     52 	/*
     53 	 * For the first word we load our end address,
     54 	 * giving enough space for the bootinfo structure.
     55 	 */
     56 	endp[0] = (u_long)((char *)endp + BOOTINFO_SIZE);
     57 	bootinfo = (char *)ALIGN(&endp[2]);
     58 	endp[1] = (u_long)bootinfo;
     59 	bi = (struct btinfo_common *)bootinfo;
     60 	bi->next = bi->type = 0;
     61 	bi_next = bootinfo;
     62 	bi_size = 0;
     63 
     64 	bi_magic.magic = BOOTINFO_MAGIC;
     65 	bi_add(&bi_magic, BTINFO_MAGIC, sizeof(bi_magic));
     66 	return (u_long) endp;
     67 }
     68 
     69 void
     70 bi_add(new, type, size)
     71 	void *new;
     72 	int type;
     73 	size_t size;
     74 {
     75 	struct btinfo_common *bi;
     76 
     77 	if (bi_size + size > BOOTINFO_SIZE)
     78 		return;				/* XXX error? */
     79 
     80 	bi = new;
     81 	bi->next = ALIGN(size);
     82 	bi->type = type;
     83 	memcpy(bi_next, new, size);
     84 	bi_next += ALIGN(size);
     85 
     86 	bi = (struct btinfo_common *)bi_next;
     87 	bi->next = bi->type = 0;
     88 }
     89