/*
* Copyright (c) 1997, 1999
* Matthias Drochner. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
/*
* Try 2 more fancy BIOS calls to get the size of extended
* memory besides the classical int15/88, take maximum.
* needs lowlevel parts from biosmemx.S and biosmem.S
*/
#include <lib/libsa/stand.h>
#include "libi386.h"
int
getextmemx(void)
{
/*
* Allocate 6 words, not 5, to work around buggy firmware --
* see comment on getmementry in biosmemx.S.
*/
int buf[6], i;
int extmem = getextmem1();
#ifdef SUPPORT_PS2
struct {
uint16_t len;
uint32_t dta[8];
/* pad to 64 bytes - without this, machine would reset */
uint8_t __pad[30];
} __packed bufps2;
#endif
#ifdef DEBUG_MEMSIZE
printf("extmem1: %xk\n", extmem);
#endif
if (!getextmem2(buf)) {
#ifdef DEBUG_MEMSIZE
printf("extmem2: %xk + %xk\n", buf[0], buf[1] * 64);
#endif
if (buf[0] <= 15 * 1024) {
int help = buf[0];
if (help == 15 * 1024)
help += buf[1] * 64;
if (extmem < help)
extmem = help;
}
}
i = 0;
do {
if (getmementry(&i, buf))
break;
#ifdef DEBUG_MEMSIZE
printf("mementry: (%d) %x %x %x %x %x\n",
i, buf[0], buf[1], buf[2], buf[3], buf[4]);
#endif
if ((buf[4] == 1 && buf[0] == 0x100000)
&& extmem < buf[2] / 1024)
extmem = buf[2] / 1024;
} while (i);
#ifdef SUPPORT_PS2
/* use local memory information from RETURN MEMORY-MAP INFORMATION */
if (!getextmemps2((void *) &bufps2)) {
int help = bufps2.dta[0];
if (help == 15 * 1024)
help += bufps2.dta[1];
if (extmem < help)
extmem = help;
}
#endif
