biosmemps2.S revision 1.6
1 1.6 joerg /* $NetBSD: biosmemps2.S,v 1.6 2011/06/16 13:27:59 joerg Exp $ */ 2 1.1 jdolecek 3 1.1 jdolecek /*- 4 1.1 jdolecek * Copyright (c) 2003 The NetBSD Foundation, Inc. 5 1.1 jdolecek * All rights reserved. 6 1.1 jdolecek * 7 1.1 jdolecek * This code is derived from software contributed to The NetBSD Foundation 8 1.1 jdolecek * by Jaromir Dolecek. 9 1.1 jdolecek * 10 1.1 jdolecek * Redistribution and use in source and binary forms, with or without 11 1.1 jdolecek * modification, are permitted provided that the following conditions 12 1.1 jdolecek * are met: 13 1.1 jdolecek * 1. Redistributions of source code must retain the above copyright 14 1.1 jdolecek * notice, this list of conditions and the following disclaimer. 15 1.1 jdolecek * 2. Redistributions in binary form must reproduce the above copyright 16 1.1 jdolecek * notice, this list of conditions and the following disclaimer in the 17 1.1 jdolecek * documentation and/or other materials provided with the distribution. 18 1.1 jdolecek * 19 1.1 jdolecek * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 1.1 jdolecek * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 1.1 jdolecek * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 1.1 jdolecek * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 1.1 jdolecek * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 1.1 jdolecek * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 1.1 jdolecek * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 1.1 jdolecek * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 1.1 jdolecek * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 1.1 jdolecek * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 1.1 jdolecek * POSSIBILITY OF SUCH DAMAGE. 30 1.1 jdolecek */ 31 1.1 jdolecek 32 1.1 jdolecek #include <machine/asm.h> 33 1.1 jdolecek 34 1.1 jdolecek .text 35 1.1 jdolecek 36 1.1 jdolecek /* int getextmemp2(void buffer) 37 1.1 jdolecek call int 15 function 0xc7 - later PS/2s - RETURN MEMORY-MAP INFORMATION 38 1.1 jdolecek return: 0=OK, nonzero=error 39 1.1 jdolecek buffer: filled with memory-map table structure 40 1.1 jdolecek */ 41 1.1 jdolecek ENTRY(getextmemps2) 42 1.2 dsl .code32 43 1.6 joerg movl %eax, %edx 44 1.6 joerg xorl %eax, %eax 45 1.6 joerg pusha 46 1.1 jdolecek 47 1.1 jdolecek call _C_LABEL(prot_to_real) 48 1.2 dsl .code16 49 1.1 jdolecek 50 1.1 jdolecek # do int15, function 0xc0 call to discover if C7h is supported 51 1.1 jdolecek movb $0xc0, %ah 52 1.1 jdolecek int $0x15 53 1.5 jakllsch setc %cl 54 1.1 jdolecek jc out # 0xc0 not supported if carry set 55 1.1 jdolecek 56 1.1 jdolecek # check feature byte 2, bit 4 to see if return memory map is supported 57 1.2 dsl movb %es:6(%bx), %al 58 1.1 jdolecek andb $0x10, %al 59 1.1 jdolecek jnz getmem # 0xc7 supported 60 1.1 jdolecek 61 1.5 jakllsch # set %cl to indicate failure, and exit 62 1.5 jakllsch movb $2, %cl 63 1.1 jdolecek jmp out 64 1.1 jdolecek 65 1.1 jdolecek getmem: 66 1.1 jdolecek # move the parameter to right register 67 1.4 dsl push %ds 68 1.1 jdolecek movl %edx, %esi 69 1.2 dsl andl $0xf, %esi 70 1.2 dsl shrl $4, %edx 71 1.2 dsl mov %ds, %ax 72 1.2 dsl add %dx, %ax 73 1.2 dsl mov %ax, %ds 74 1.1 jdolecek 75 1.1 jdolecek # actually call int15, function 0xc7 now 76 1.1 jdolecek movb $0xc7, %ah 77 1.1 jdolecek int $0x15 78 1.5 jakllsch setc %cl # save carry 79 1.4 dsl pop %ds 80 1.1 jdolecek 81 1.1 jdolecek out: 82 1.2 dsl calll _C_LABEL(real_to_prot) 83 1.2 dsl .code32 84 1.1 jdolecek 85 1.6 joerg movb %cl, 28(%esp) 86 1.6 joerg popa 87 1.1 jdolecek ret 88
Indexes created Mon Sep 29 21:09:56 GMT 2025