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      1 /*	$NetBSD: bootinfo_memmap.c,v 1.8 2024/08/24 20:23:11 riastradh Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1999
      5  *	Matthias Drochner.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  *
     27  */
     28 
     29 #include <lib/libsa/stand.h>
     30 #include "libi386.h"
     31 #include "bootinfo.h"
     32 
     33 struct btinfo_memmap *btinfo_memmap = NULL;
     34 
     35 extern int getmementry(int *, int *);
     36 
     37 void
     38 bi_getmemmap(void)
     39 {
     40 	/*
     41 	 * Allocate 6 words, not 5, to work around buggy firmware --
     42 	 * see comment on getmementry in biosmemx.S.
     43 	 */
     44 	int buf[6], i, nranges, n;
     45 
     46 	nranges = 0;
     47 	i = 0;
     48 	do {
     49 		if (getmementry(&i, buf))
     50 			break;
     51 		nranges++;
     52 	} while (i);
     53 
     54 	btinfo_memmap = alloc(sizeof(struct btinfo_memmap)
     55 		+ (nranges - 1) * sizeof(struct bi_memmap_entry));
     56 
     57 	i = 0;
     58 	for (n = 0; n < nranges; n++) {
     59 		getmementry(&i, buf);
     60 		memcpy(&btinfo_memmap->entry[n], buf,
     61 		       sizeof(struct bi_memmap_entry));
     62 	}
     63 	btinfo_memmap->num = nranges;
     64 
     65 	BI_ADD(btinfo_memmap, BTINFO_MEMMAP, sizeof(struct btinfo_memmap)
     66 	       + (nranges - 1) * sizeof(struct bi_memmap_entry));
     67 }
     68