biosmemx.S revision 1.5.2.3
1 1.5.2.3 skrll /* $NetBSD: biosmemx.S,v 1.5.2.3 2004/09/21 13:17:10 skrll 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 1.1 drochner /* int getextmem2(int buffer[2]) 34 1.1 drochner return: 0=OK, -1=error 35 1.1 drochner buffer[0]: extmem kBytes below 16M (max 15M/1024) 36 1.1 drochner buffer[1]: extmem above 16M, in 64k units 37 1.1 drochner */ 38 1.1 drochner ENTRY(getextmem2) 39 1.1 drochner pushl %ebp 40 1.1 drochner movl %esp,%ebp 41 1.1 drochner pushl %ebx 42 1.1 drochner pushl %ecx 43 1.1 drochner pushl %edx 44 1.1 drochner push %esi 45 1.1 drochner push %edi 46 1.1 drochner 47 1.1 drochner call _C_LABEL(prot_to_real) 48 1.3 dsl .code16 49 1.1 drochner 50 1.3 dsl xorl %ebx, %ebx 51 1.1 drochner movl $0xe801, %eax 52 1.1 drochner int $0x15 53 1.5.2.1 skrll pushf 54 1.1 drochner 55 1.5.2.1 skrll movw %si, %ax 56 1.5.2.1 skrll orw %si, %bx 57 1.5.2.1 skrll jz 1f /* if zero use configured values */ 58 1.5.2.1 skrll movw %cx, %ax /* k below 16M (max 0x3c00 = 15MB) */ 59 1.5.2.1 skrll movw %dx, %bx /* 64k above 16M */ 60 1.5.2.1 skrll 1: 61 1.5.2.1 skrll popf 62 1.5.2.1 skrll setc %bl 63 1.1 drochner 64 1.3 dsl calll _C_LABEL(real_to_prot) 65 1.3 dsl .code32 66 1.1 drochner 67 1.5.2.1 skrll movl 8(%ebp), %edi 68 1.5.2.1 skrll xorl %eax, %eax 69 1.5.2.1 skrll movw %cx, %ax 70 1.5.2.1 skrll stosl 71 1.5.2.1 skrll movw %dx, %ax 72 1.5.2.1 skrll stosl 73 1.5.2.1 skrll movb %bl, %al 74 1.5.2.1 skrll cbw 75 1.1 drochner 76 1.1 drochner pop %edi 77 1.1 drochner pop %esi 78 1.1 drochner popl %edx 79 1.1 drochner popl %ecx 80 1.1 drochner popl %ebx 81 1.1 drochner popl %ebp 82 1.1 drochner ret 83 1.1 drochner 84 1.2 drochner /* int getmementry(int *iterator, buffer[5]) 85 1.2 drochner return: 0=ok, else error 86 1.1 drochner buffer[0]: start of memory chunk 87 1.1 drochner buffer[2]: length (bytes) 88 1.1 drochner buffer[4]: type 89 1.1 drochner */ 90 1.1 drochner ENTRY(getmementry) 91 1.1 drochner pushl %ebp 92 1.1 drochner movl %esp,%ebp 93 1.1 drochner pushl %ebx 94 1.1 drochner pushl %ecx 95 1.1 drochner pushl %edx 96 1.1 drochner push %esi 97 1.1 drochner push %edi 98 1.1 drochner 99 1.2 drochner movl 8(%ebp), %eax 100 1.5.2.1 skrll movl 0(%eax), %ebx /* index */ 101 1.5.2.1 skrll movl $20, %ecx /* Buffer size */ 102 1.5.2.1 skrll movl $0x534d4150, %edx /* "SMAP" */ 103 1.5.2.1 skrll movl 12(%ebp), %edi /* buffer address */ 104 1.1 drochner 105 1.1 drochner call _C_LABEL(prot_to_real) 106 1.3 dsl .code16 107 1.4 dsl 108 1.4 dsl push %di 109 1.4 dsl shrl $4, %edi 110 1.4 dsl mov %ds, %ax 111 1.4 dsl add %di, %ax 112 1.5 dsl mov %ax, %es 113 1.4 dsl pop %di 114 1.5.2.1 skrll and $0xf, %di /* buffer addres now in ES:DI */ 115 1.1 drochner 116 1.5.2.1 skrll movl $0xe820, %eax /* Some BIOS check EAX value */ 117 1.1 drochner int $0x15 118 1.1 drochner 119 1.2 drochner setc %cl 120 1.1 drochner 121 1.3 dsl calll _C_LABEL(real_to_prot) 122 1.3 dsl .code32 123 1.1 drochner 124 1.2 drochner movl 8(%ebp), %eax 125 1.5.2.1 skrll movl %ebx, 0(%eax) /* updated index */ 126 1.2 drochner xorl %eax, %eax 127 1.2 drochner movb %cl, %al 128 1.1 drochner 129 1.1 drochner pop %edi 130 1.1 drochner pop %esi 131 1.1 drochner popl %edx 132 1.1 drochner popl %ecx 133 1.1 drochner popl %ebx 134 1.1 drochner popl %ebp 135 1.1 drochner ret 136
Indexes created Wed Oct 22 00:09:40 GMT 2025