biosmemx.S revision 1.6
1 /* $NetBSD: biosmemx.S,v 1.6 2003/11/07 11:34:28 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 #include <machine/asm.h> 36 37 .text 38 39 /* int getextmem2(int buffer[2]) 40 return: 0=OK, -1=error 41 buffer[0]: extmem kBytes below 16M (max 15M/1024) 42 buffer[1]: extmem above 16M, in 64k units 43 */ 44 ENTRY(getextmem2) 45 pushl %ebp 46 movl %esp,%ebp 47 pushl %ebx 48 pushl %ecx 49 pushl %edx 50 push %esi 51 push %edi 52 53 call _C_LABEL(prot_to_real) 54 .code16 55 56 xorl %ebx, %ebx 57 movl $0xe801, %eax 58 int $0x15 59 pushf 60 61 movw %si, %ax 62 orw %si, %bx 63 jz 1f /* if zero use configured values */ 64 movw %cx, %ax /* k below 16M (max 0x3c00 = 15MB) */ 65 movw %dx, %bx /* 64k above 16M */ 66 1: 67 popf 68 setc %bl 69 70 calll _C_LABEL(real_to_prot) 71 .code32 72 73 movl 8(%ebp), %edi 74 xorl %eax, %eax 75 movw %cx, %ax 76 stosl 77 movw %dx, %ax 78 stosl 79 movb %bl, %al 80 cbw 81 82 pop %edi 83 pop %esi 84 popl %edx 85 popl %ecx 86 popl %ebx 87 popl %ebp 88 ret 89 90 /* int getmementry(int *iterator, buffer[5]) 91 return: 0=ok, else error 92 buffer[0]: start of memory chunk 93 buffer[2]: length (bytes) 94 buffer[4]: type 95 */ 96 ENTRY(getmementry) 97 pushl %ebp 98 movl %esp,%ebp 99 pushl %ebx 100 pushl %ecx 101 pushl %edx 102 push %esi 103 push %edi 104 105 movl 8(%ebp), %eax 106 movl 0(%eax), %ebx /* index */ 107 movl $20, %ecx /* Buffer size */ 108 movl $0x534d4150, %edx /* "SMAP" */ 109 movl 12(%ebp), %edi /* buffer address */ 110 111 call _C_LABEL(prot_to_real) 112 .code16 113 114 push %di 115 shrl $4, %edi 116 mov %ds, %ax 117 add %di, %ax 118 mov %ax, %es 119 pop %di 120 and $0xf, %di /* buffer addres now in ES:DI */ 121 122 movl $0xe820, %eax /* Some BIOS check EAX value */ 123 int $0x15 124 125 setc %cl 126 127 calll _C_LABEL(real_to_prot) 128 .code32 129 130 movl 8(%ebp), %eax 131 movl %ebx, 0(%eax) /* updated index */ 132 xorl %eax, %eax 133 movb %cl, %al 134 135 pop %edi 136 pop %esi 137 popl %edx 138 popl %ecx 139 popl %ebx 140 popl %ebp 141 ret 142
Indexes created Tue Sep 30 10:09:55 GMT 2025