biosmemps2.S revision 1.4
1 /* $NetBSD: biosmemps2.S,v 1.4 2009/11/21 11:52:57 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 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <machine/asm.h> 33 34 .text 35 36 /* int getextmemp2(void buffer) 37 call int 15 function 0xc7 - later PS/2s - RETURN MEMORY-MAP INFORMATION 38 return: 0=OK, nonzero=error 39 buffer: filled with memory-map table structure 40 */ 41 ENTRY(getextmemps2) 42 .code32 43 pushl %ebp 44 movl %esp,%ebp 45 pushl %ebx 46 pushl %ecx 47 pushl %edx 48 push %esi 49 push %edi 50 51 movl 8(%ebp), %edx # parameter 52 53 call _C_LABEL(prot_to_real) 54 .code16 55 56 # do int15, function 0xc0 call to discover if C7h is supported 57 movb $0xc0, %ah 58 int $0x15 59 setc %bl 60 jc out # 0xc0 not supported if carry set 61 62 # check feature byte 2, bit 4 to see if return memory map is supported 63 movb %es:6(%bx), %al 64 andb $0x10, %al 65 jnz getmem # 0xc7 supported 66 67 # set %bl to indicate failure, and exit 68 movb $2, %bl 69 jmp out 70 71 getmem: 72 # move the parameter to right register 73 push %ds 74 movl %edx, %esi 75 andl $0xf, %esi 76 shrl $4, %edx 77 mov %ds, %ax 78 add %dx, %ax 79 mov %ax, %ds 80 81 # actually call int15, function 0xc7 now 82 movb $0xc7, %ah 83 int $0x15 84 setc %bl # save carry 85 pop %ds 86 87 out: 88 calll _C_LABEL(real_to_prot) 89 .code32 90 91 xorl %eax, %eax 92 movb %bl, %al # return value in %ax 93 94 pop %edi 95 pop %esi 96 popl %edx 97 popl %ecx 98 popl %ebx 99 popl %ebp 100 ret 101
Indexes created Tue Sep 30 11:09:46 GMT 2025