1 2/* 3 * Copyright (c) 1996 4 * Perry E. Metzger. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgements: 16 * This product includes software developed for the NetBSD Project 17 * by Perry E. Metzger. 18 * 4. The names of the authors may not be used to endorse or promote products 19 * derived from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 * 32 */ 33 34 35#include <machine/asm.h> 36 37#define data32 .byte 0x66 38 39 .text 40 41ENTRY(biosvideomode) 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 50 movb $0, %ah 51 movb $2, %al 52 int $0x10 53 # zero-extend 16-bit result to 32 bits. 54 data32 55 movl $0, %ebx 56 mov %eax,%ebx # !!! at run time, it is mov %ax,%bx 57 58 data32 59 call _C_LABEL(real_to_prot) 60 61 movl %ebx, %eax 62 63 pop %edi 64 pop %esi 65 popl %ebx 66 popl %ebp 67 ret 68