1 /* $NetBSD: getextmemx.c,v 1.9 2008/12/14 17:03:43 christos 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 extern int getextmem2(int *); 39 extern int getmementry(int *, int *); 40 extern int getextmemps2(void *); 41 42 int 43 getextmemx(void) 44 { 45 int buf[5], i; 46 int extmem = getextmem1(); 47 #ifdef SUPPORT_PS2 48 struct { 49 uint16_t len; 50 uint32_t dta[8]; 51 /* pad to 64 bytes - without this, machine would reset */ 52 uint8_t __pad[30]; 53 } __packed bufps2; 54 #endif 55 56 #ifdef DEBUG_MEMSIZE 57 printf("extmem1: %xk\n", extmem); 58 #endif 59 if (!getextmem2(buf)) { 60 #ifdef DEBUG_MEMSIZE 61 printf("extmem2: %xk + %xk\n", buf[0], buf[1] * 64); 62 #endif 63 if (buf[0] <= 15 * 1024) { 64 int help = buf[0]; 65 if (help == 15 * 1024) 66 help += buf[1] * 64; 67 if (extmem < help) 68 extmem = help; 69 } 70 } 71 72 i = 0; 73 do { 74 if (getmementry(&i, buf)) 75 break; 76 #ifdef DEBUG_MEMSIZE 77 printf("mementry: (%d) %x %x %x %x %x\n", 78 i, buf[0], buf[1], buf[2], buf[3], buf[4]); 79 #endif 80 if ((buf[4] == 1 && buf[0] == 0x100000) 81 && extmem < buf[2] / 1024) 82 extmem = buf[2] / 1024; 83 } while (i); 84 85 #ifdef SUPPORT_PS2 86 /* use local memory information from RETURN MEMORY-MAP INFORMATION */ 87 if (!getextmemps2((void *) &bufps2)) { 88 int help = bufps2.dta[0]; 89 if (help == 15 * 1024) 90 help += bufps2.dta[1]; 91 if (extmem < help) 92 extmem = help; 93 } 94 #endif 95 96 return extmem; 97 } 98