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 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