1 /* $NetBSD: getextmemx.c,v 1.5 2003/11/07 11:30:39 dsl 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 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed for the NetBSD Project 18 * by Matthias Drochner. 19 * 4. The name of the author may not be used to endorse or promote products 20 * derived from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 * 33 */ 34 35 /* 36 * Try 2 more fancy BIOS calls to get the size of extended 37 * memory besides the classical int15/88, take maximum. 38 * needs lowlevel parts from biosmemx.S and biosmem.S 39 */ 40 41 #include <lib/libsa/stand.h> 42 #include "libi386.h" 43 44 extern int getextmem2 __P((int *)); 45 extern int getmementry __P((int *, int *)); 46 extern int getextmemps2 __P((void *)); 47 48 int 49 getextmemx() 50 { 51 int buf[5], i; 52 int extmem = getextmem1(); 53 #ifdef SUPPORT_PS2 54 struct { 55 uint16_t len; 56 uint32_t dta[8]; 57 /* pad to 64 bytes - without this, machine would reset */ 58 uint8_t __pad[30]; 59 } __attribute__((__packed__)) bufps2; 60 #endif 61 62 #ifdef DEBUG_MEMSIZE 63 printf("extmem1: %xk\n", extmem); 64 #endif 65 if (!getextmem2(buf)) { 66 #ifdef DEBUG_MEMSIZE 67 printf("extmem2: %xk + %xk\n", buf[0], buf[1] * 64); 68 #endif 69 if (buf[0] <= 15 * 1024) { 70 int help = buf[0]; 71 if (help == 15 * 1024) 72 help += buf[1] * 64; 73 if (extmem < help) 74 extmem = help; 75 } 76 } 77 78 i = 0; 79 do { 80 if (getmementry(&i, buf)) 81 break; 82 #ifdef DEBUG_MEMSIZE 83 printf("mementry: (%d) %x %x %x %x %x\n", 84 i, buf[0], buf[1], buf[2], buf[3], buf[4]); 85 #endif 86 if ((buf[4] == 1 && buf[0] == 0x100000) 87 && extmem < buf[2] / 1024) 88 extmem = buf[2] / 1024; 89 } while (i); 90 91 #ifdef SUPPORT_PS2 92 /* use local memory information from RETURN MEMORY-MAP INFORMATION */ 93 if (!getextmemps2((void *) &bufps2)) { 94 int help = bufps2.dta[0]; 95 if (help == 15 * 1024) 96 help += bufps2.dta[1]; 97 if (extmem < help) 98 extmem = help; 99 } 100 #endif 101 102 return (extmem); 103 } 104