1/* $NetBSD: biosmem.S,v 1.8 2005/12/11 12:17:48 christos Exp $ */ 2 3/* 4 * Copyright (c) 1996 5 * Perry E. Metzger. 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 acknowledgements: 17 * This product includes software developed for the NetBSD Project 18 * by Perry E. Metzger. 19 * 4. The names of the authors 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/* get mem below 1M, in kByte */ 40 41ENTRY(getbasemem) 42 pushl %ebp 43 movl %esp,%ebp 44 pushl %ebx 45 push %esi 46 push %edi 47 48 call _C_LABEL(prot_to_real) 49 .code16 50 51 int $0x12 52 # zero-extend 16-bit result to 32 bits. 53 movl $0, %ebx 54 mov %ax,%bx 55 56 calll _C_LABEL(real_to_prot) 57 .code32 58 59 movl %ebx, %eax 60 61 pop %edi 62 pop %esi 63 popl %ebx 64 popl %ebp 65 ret 66 67/* get mem above 1M, in kByte */ 68 69ENTRY(getextmem1) 70 pushl %ebp 71 movl %esp,%ebp 72 pushl %ebx 73 push %esi 74 push %edi 75 76 call _C_LABEL(prot_to_real) 77 .code16 78 79 movb $0x88,%ah 80 int $0x15 81 82 # zero-extend 16-bit result to 32 bits. 83 movl $0, %ebx 84 mov %ax,%bx 85 86 calll _C_LABEL(real_to_prot) 87 .code32 88 89 movl %ebx, %eax 90 91 pop %edi 92 pop %esi 93 popl %ebx 94 popl %ebp 95 ret 96 97