sys/arch/arc/stand/boot/bootinfo.c

   1 /*      $NetBSD: bootinfo.c,v 1.3 2006/07/22 18:15:06 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  *
  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 }