biosmemps2.S revision 1.1
1 /* $NetBSD: biosmemps2.S,v 1.1 2003/01/23 21:22:25 jdolecek 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 #define addr32 .byte 0x67 42 #define data32 .byte 0x66 43 44 .text 45 46 /* int getextmemp2(void buffer) 47 call int 15 function 0xc7 - later PS/2s - RETURN MEMORY-MAP INFORMATION 48 return: 0=OK, nonzero=error 49 buffer: filled with memory-map table structure 50 */ 51 ENTRY(getextmemps2) 52 pushl %ebp 53 movl %esp,%ebp 54 pushl %ebx 55 pushl %ecx 56 pushl %edx 57 push %esi 58 push %edi 59 60 movl 8(%ebp), %edx # parameter 61 62 call _C_LABEL(prot_to_real) 63 64 # do int15, function 0xc0 call to discover if C7h is supported 65 movb $0xc0, %ah 66 int $0x15 67 setc %bl 68 jc out # 0xc0 not supported if carry set 69 70 # check feature byte 2, bit 4 to see if return memory map is supported 71 addr32 72 movb %es:6(%ebx), %al 73 andb $0x10, %al 74 jnz getmem # 0xc7 supported 75 76 # set %bl to indicate failure, and exit 77 movb $2, %bl 78 jmp out 79 80 getmem: 81 # move the parameter to right register 82 data32 83 movl %edx, %esi 84 85 # actually call int15, function 0xc7 now 86 movb $0xc7, %ah 87 int $0x15 88 setc %bl # save carry 89 90 out: 91 data32 92 call _C_LABEL(real_to_prot) 93 94 xorl %eax, %eax 95 movb %bl, %al # return value in %ax 96 97 pop %edi 98 pop %esi 99 popl %edx 100 popl %ecx 101 popl %ebx 102 popl %ebp 103 ret 104
Indexes created Tue Sep 30 11:09:46 GMT 2025