biosmemps2.S revision 1.7
1 1.7 maxv /* $NetBSD: biosmemps2.S,v 1.7 2016/12/04 08:21:08 maxv Exp $ */ 2 1.1 jdolecek 3 1.7 maxv /* 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 1.7 maxv /* 37 1.7 maxv * int getextmemps2(void *buffer) 38 1.7 maxv * 39 1.7 maxv * call int 15 function 0xc7 - later PS/2s - RETURN MEMORY-MAP INFORMATION 40 1.7 maxv * return: 0=OK, nonzero=error 41 1.7 maxv * buffer: filled with memory-map table structure 42 1.7 maxv */ 43 1.1 jdolecek ENTRY(getextmemps2) 44 1.2 dsl .code32 45 1.7 maxv movl %eax,%edx 46 1.7 maxv xorl %eax,%eax 47 1.6 joerg pusha 48 1.1 jdolecek 49 1.1 jdolecek call _C_LABEL(prot_to_real) 50 1.2 dsl .code16 51 1.1 jdolecek 52 1.7 maxv /* do int15, function 0xc0 call to discover if C7h is supported */ 53 1.7 maxv movb $0xc0,%ah 54 1.1 jdolecek int $0x15 55 1.5 jakllsch setc %cl 56 1.7 maxv jc out /* 0xc0 not supported if carry set */ 57 1.1 jdolecek 58 1.7 maxv /* check feature byte 2, bit 4 to see if return memory map is supported */ 59 1.7 maxv movb %es:6(%bx),%al 60 1.7 maxv andb $0x10,%al 61 1.7 maxv jnz getmem /* 0xc7 supported */ 62 1.7 maxv 63 1.7 maxv /* set %cl to indicate failure, and exit */ 64 1.7 maxv movb $2,%cl 65 1.1 jdolecek jmp out 66 1.1 jdolecek 67 1.1 jdolecek getmem: 68 1.7 maxv /* move the parameter to right register */ 69 1.4 dsl push %ds 70 1.7 maxv movl %edx,%esi 71 1.7 maxv andl $0xf,%esi 72 1.7 maxv shrl $4,%edx 73 1.7 maxv mov %ds,%ax 74 1.7 maxv add %dx,%ax 75 1.7 maxv mov %ax,%ds 76 1.1 jdolecek 77 1.7 maxv /* actually call int15, function 0xc7 now */ 78 1.7 maxv movb $0xc7,%ah 79 1.1 jdolecek int $0x15 80 1.7 maxv setc %cl /* save carry */ 81 1.4 dsl pop %ds 82 1.1 jdolecek 83 1.1 jdolecek out: 84 1.2 dsl calll _C_LABEL(real_to_prot) 85 1.2 dsl .code32 86 1.1 jdolecek 87 1.7 maxv movb %cl,28(%esp) 88 1.6 joerg popa 89 1.1 jdolecek ret 90 1.7 maxv 91
Indexes created Mon Sep 29 21:09:56 GMT 2025