biosmemx.S revision 1.11
1 1.11 andvar /* $NetBSD: biosmemx.S,v 1.11 2021/08/02 12:56:23 andvar Exp $ */ 2 1.1 drochner 3 1.1 drochner /* 4 1.2 drochner * Copyright (c) 1997, 1999 5 1.1 drochner * Matthias Drochner. All rights reserved. 6 1.1 drochner * 7 1.1 drochner * Redistribution and use in source and binary forms, with or without 8 1.1 drochner * modification, are permitted provided that the following conditions 9 1.1 drochner * are met: 10 1.1 drochner * 1. Redistributions of source code must retain the above copyright 11 1.1 drochner * notice, this list of conditions and the following disclaimer. 12 1.1 drochner * 2. Redistributions in binary form must reproduce the above copyright 13 1.1 drochner * notice, this list of conditions and the following disclaimer in the 14 1.1 drochner * documentation and/or other materials provided with the distribution. 15 1.1 drochner * 16 1.1 drochner * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 1.1 drochner * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 1.1 drochner * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 1.1 drochner * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 1.1 drochner * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 1.1 drochner * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 1.1 drochner * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 1.1 drochner * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 1.1 drochner * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 1.1 drochner * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 1.1 drochner * 27 1.1 drochner */ 28 1.1 drochner 29 1.1 drochner #include <machine/asm.h> 30 1.1 drochner 31 1.1 drochner .text 32 1.1 drochner 33 1.10 maxv /* 34 1.10 maxv * int getextmem2(int buffer[2]) 35 1.10 maxv * 36 1.10 maxv * return: 0=OK, -1=error 37 1.10 maxv * buffer[0]: extmem kBytes below 16M (max 15M/1024) 38 1.10 maxv * buffer[1]: extmem above 16M, in 64k units 39 1.10 maxv */ 40 1.1 drochner ENTRY(getextmem2) 41 1.1 drochner pushl %ebp 42 1.1 drochner movl %esp,%ebp 43 1.1 drochner pushl %ebx 44 1.1 drochner pushl %ecx 45 1.1 drochner pushl %edx 46 1.1 drochner push %esi 47 1.1 drochner push %edi 48 1.1 drochner 49 1.1 drochner call _C_LABEL(prot_to_real) 50 1.3 dsl .code16 51 1.1 drochner 52 1.10 maxv xorl %ebx,%ebx 53 1.10 maxv movl $0xe801,%eax 54 1.1 drochner int $0x15 55 1.6 dsl pushf 56 1.1 drochner 57 1.10 maxv movw %si,%ax 58 1.10 maxv orw %si,%bx 59 1.6 dsl jz 1f /* if zero use configured values */ 60 1.10 maxv movw %cx,%ax /* k below 16M (max 0x3c00 = 15MB) */ 61 1.10 maxv movw %dx,%bx /* 64k above 16M */ 62 1.6 dsl 1: 63 1.6 dsl popf 64 1.6 dsl setc %bl 65 1.1 drochner 66 1.3 dsl calll _C_LABEL(real_to_prot) 67 1.3 dsl .code32 68 1.1 drochner 69 1.10 maxv movl 8(%ebp),%edi 70 1.10 maxv xorl %eax,%eax 71 1.10 maxv movw %cx,%ax 72 1.6 dsl stosl 73 1.10 maxv movw %dx,%ax 74 1.6 dsl stosl 75 1.10 maxv movb %bl,%al 76 1.6 dsl cbw 77 1.1 drochner 78 1.1 drochner pop %edi 79 1.1 drochner pop %esi 80 1.1 drochner popl %edx 81 1.1 drochner popl %ecx 82 1.1 drochner popl %ebx 83 1.1 drochner popl %ebp 84 1.1 drochner ret 85 1.1 drochner 86 1.10 maxv /* 87 1.10 maxv * int getmementry(int *iterator, int buffer[5]) 88 1.10 maxv * 89 1.10 maxv * return: 0=ok, else error 90 1.10 maxv * buffer[0]: start of memory chunk 91 1.10 maxv * buffer[2]: length (bytes) 92 1.10 maxv * buffer[4]: type 93 1.10 maxv */ 94 1.1 drochner ENTRY(getmementry) 95 1.1 drochner pushl %ebp 96 1.1 drochner movl %esp,%ebp 97 1.1 drochner pushl %ebx 98 1.1 drochner pushl %ecx 99 1.1 drochner pushl %edx 100 1.1 drochner push %esi 101 1.1 drochner push %edi 102 1.1 drochner 103 1.10 maxv movl 8(%ebp),%eax 104 1.10 maxv movl 0(%eax),%ebx /* index */ 105 1.10 maxv movl $20,%ecx /* Buffer size */ 106 1.10 maxv movl $0x534d4150,%edx /* "SMAP" */ 107 1.10 maxv movl 12(%ebp),%edi /* buffer address */ 108 1.1 drochner 109 1.1 drochner call _C_LABEL(prot_to_real) 110 1.3 dsl .code16 111 1.4 dsl 112 1.4 dsl push %di 113 1.10 maxv shrl $4,%edi 114 1.10 maxv mov %ds,%ax 115 1.10 maxv add %di,%ax 116 1.10 maxv mov %ax,%es 117 1.4 dsl pop %di 118 1.11 andvar and $0xf,%di /* buffer address now in ES:DI */ 119 1.1 drochner 120 1.10 maxv movl $0xe820,%eax /* Some BIOS check EAX value */ 121 1.1 drochner int $0x15 122 1.1 drochner 123 1.2 drochner setc %cl 124 1.1 drochner 125 1.3 dsl calll _C_LABEL(real_to_prot) 126 1.3 dsl .code32 127 1.1 drochner 128 1.10 maxv movl 8(%ebp),%eax 129 1.10 maxv movl %ebx,0(%eax) /* updated index */ 130 1.10 maxv xorl %eax,%eax 131 1.10 maxv movb %cl,%al 132 1.1 drochner 133 1.1 drochner pop %edi 134 1.1 drochner pop %esi 135 1.1 drochner popl %edx 136 1.1 drochner popl %ecx 137 1.1 drochner popl %ebx 138 1.1 drochner popl %ebp 139 1.1 drochner ret 140 1.9 ad 141 1.10 maxv /* 142 1.10 maxv * int biosA20(void) 143 1.10 maxv * 144 1.10 maxv * return: 0=ok, else error 145 1.10 maxv */ 146 1.9 ad ENTRY(biosA20) 147 1.9 ad pushl %ebp 148 1.9 ad movl %esp,%ebp 149 1.9 ad pushl %ebx 150 1.9 ad pushl %ecx 151 1.9 ad pushl %edx 152 1.9 ad push %esi 153 1.9 ad push %edi 154 1.9 ad 155 1.9 ad call _C_LABEL(prot_to_real) 156 1.9 ad .code16 157 1.9 ad 158 1.10 maxv movl $0x2401,%eax 159 1.9 ad int $0x15 160 1.9 ad setc %cl 161 1.9 ad 162 1.9 ad calll _C_LABEL(real_to_prot) 163 1.9 ad .code32 164 1.9 ad 165 1.10 maxv movzbl %cl,%eax 166 1.9 ad 167 1.9 ad pop %edi 168 1.9 ad pop %esi 169 1.9 ad popl %edx 170 1.9 ad popl %ecx 171 1.9 ad popl %ebx 172 1.9 ad popl %ebp 173 1.9 ad ret 174
Indexes created Tue Sep 30 11:09:46 GMT 2025