Home | History | Annotate | Line # | Download | only in lib
getextmemx.c revision 1.9.2.1 
      1 /*	$NetBSD: getextmemx.c,v 1.9.2.1 2011/08/27 15:37:28 jym 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
     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