biosmemps2.S revision 1.2
1 /* $NetBSD: biosmemps2.S,v 1.2 2003/02/05 21:50:25 dsl Exp $ */ 2 3 /*- 4 * Copyright (c) 2003 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jaromir Dolecek. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #include <machine/asm.h> 40 41 .text 42 43 /* int getextmemp2(void buffer) 44 call int 15 function 0xc7 - later PS/2s - RETURN MEMORY-MAP INFORMATION 45 return: 0=OK, nonzero=error 46 buffer: filled with memory-map table structure 47 */ 48 ENTRY(getextmemps2) 49 .code32 50 pushl %ebp 51 movl %esp,%ebp 52 pushl %ebx 53 pushl %ecx 54 pushl %edx 55 push %esi 56 push %edi 57 58 movl 8(%ebp), %edx # parameter 59 60 call _C_LABEL(prot_to_real) 61 .code16 62 63 # do int15, function 0xc0 call to discover if C7h is supported 64 movb $0xc0, %ah 65 int $0x15 66 setc %bl 67 jc out # 0xc0 not supported if carry set 68 69 # check feature byte 2, bit 4 to see if return memory map is supported 70 movb %es:6(%bx), %al 71 andb $0x10, %al 72 jnz getmem # 0xc7 supported 73 74 # set %bl to indicate failure, and exit 75 movb $2, %bl 76 jmp out 77 78 getmem: 79 # move the parameter to right register 80 movl %edx, %esi 81 andl $0xf, %esi 82 shrl $4, %edx 83 mov %ds, %ax 84 add %dx, %ax 85 mov %ax, %ds 86 87 # actually call int15, function 0xc7 now 88 movb $0xc7, %ah 89 int $0x15 90 setc %bl # save carry 91 92 out: 93 calll _C_LABEL(real_to_prot) 94 .code32 95 96 xorl %eax, %eax 97 movb %bl, %al # return value in %ax 98 99 pop %edi 100 pop %esi 101 popl %edx 102 popl %ecx 103 popl %ebx 104 popl %ebp 105 ret 106
Indexes created Mon Sep 29 21:09:56 GMT 2025