1 /* $NetBSD: getextmemx.c,v 1.10 2011/06/16 13:27:59 joerg Exp $ */
2
3 /*
4 * Copyright (c) 1997, 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 /*
30 * Try 2 more fancy BIOS calls to get the size of extended
31 * memory besides the classical int15/88, take maximum.
32 * needs lowlevel parts from biosmemx.S and biosmem.S
33 */
34
35 #include <lib/libsa/stand.h>
36 #include "libi386.h"
37
38 int
getextmemx(void)39 getextmemx(void)
40 {
41 int buf[5], i;
42 int extmem = getextmem1();
43 #ifdef SUPPORT_PS2
44 struct {
45 uint16_t len;
46 uint32_t dta[8];
47 /* pad to 64 bytes - without this, machine would reset */
48 uint8_t __pad[30];
49 } __packed bufps2;
50 #endif
51
52 #ifdef DEBUG_MEMSIZE
53 printf("extmem1: %xk\n", extmem);
54 #endif
55 if (!getextmem2(buf)) {
56 #ifdef DEBUG_MEMSIZE
57 printf("extmem2: %xk + %xk\n", buf[0], buf[1] * 64);
58 #endif
59 if (buf[0] <= 15 * 1024) {
60 int help = buf[0];
61 if (help == 15 * 1024)
62 help += buf[1] * 64;
63 if (extmem < help)
64 extmem = help;
65 }
66 }
67
68 i = 0;
69 do {
70 if (getmementry(&i, buf))
71 break;
72 #ifdef DEBUG_MEMSIZE
73 printf("mementry: (%d) %x %x %x %x %x\n",
74 i, buf[0], buf[1], buf[2], buf[3], buf[4]);
75 #endif
76 if ((buf[4] == 1 && buf[0] == 0x100000)
77 && extmem < buf[2] / 1024)
78 extmem = buf[2] / 1024;
79 } while (i);
80
81 #ifdef SUPPORT_PS2
82 /* use local memory information from RETURN MEMORY-MAP INFORMATION */
83 if (!getextmemps2((void *) &bufps2)) {
84 int help = bufps2.dta[0];
85 if (help == 15 * 1024)
86 help += bufps2.dta[1];
87 if (extmem < help)
88 extmem = help;
89 }
90 #endif
91
92 return extmem;
93 }
94