94 lines
2.7 KiB
C
94 lines
2.7 KiB
C
/* $NetBSD: getextmemx.c,v 1.10 2011/06/16 13:27:59 joerg Exp $ */
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/*
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* Copyright (c) 1997, 1999
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* Matthias Drochner. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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/*
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* Try 2 more fancy BIOS calls to get the size of extended
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* memory besides the classical int15/88, take maximum.
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* needs lowlevel parts from biosmemx.S and biosmem.S
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*/
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#include <lib/libsa/stand.h>
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#include "libi386.h"
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int
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getextmemx(void)
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{
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int buf[5], i;
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int extmem = getextmem1();
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#ifdef SUPPORT_PS2
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struct {
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uint16_t len;
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uint32_t dta[8];
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/* pad to 64 bytes - without this, machine would reset */
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uint8_t __pad[30];
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} __packed bufps2;
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#endif
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#ifdef DEBUG_MEMSIZE
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printf("extmem1: %xk\n", extmem);
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#endif
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if (!getextmem2(buf)) {
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#ifdef DEBUG_MEMSIZE
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printf("extmem2: %xk + %xk\n", buf[0], buf[1] * 64);
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#endif
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if (buf[0] <= 15 * 1024) {
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int help = buf[0];
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if (help == 15 * 1024)
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help += buf[1] * 64;
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if (extmem < help)
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extmem = help;
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}
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}
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i = 0;
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do {
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if (getmementry(&i, buf))
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break;
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#ifdef DEBUG_MEMSIZE
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printf("mementry: (%d) %x %x %x %x %x\n",
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i, buf[0], buf[1], buf[2], buf[3], buf[4]);
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#endif
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if ((buf[4] == 1 && buf[0] == 0x100000)
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&& extmem < buf[2] / 1024)
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extmem = buf[2] / 1024;
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} while (i);
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#ifdef SUPPORT_PS2
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/* use local memory information from RETURN MEMORY-MAP INFORMATION */
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if (!getextmemps2((void *) &bufps2)) {
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int help = bufps2.dta[0];
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if (help == 15 * 1024)
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help += bufps2.dta[1];
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if (extmem < help)
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extmem = help;
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}
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#endif
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return extmem;
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}
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