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