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biosvideomode.S revision 1.3 
      1 /*	$NetBSD: biosvideomode.S,v 1.3 2003/04/16 13:49:21 dsl Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1996
      5  * 	Perry E. Metzger.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgements:
     17  *	This product includes software developed for the NetBSD Project
     18  *	by Perry E. Metzger.
     19  * 4. The names of the authors may not be used to endorse or promote products
     20  *    derived from this software without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     23  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     24  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     25  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     26  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     27  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     28  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     29  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     30  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     31  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     32  *
     33  */
     34 
     35 #include <machine/asm.h>
     36 
     37 	.text
     38 
     39 ENTRY(biosvideomode)
     40 	pushl	%ebp
     41 	movl	%esp,%ebp
     42 	pushl	%ebx
     43 	push	%esi
     44 	push	%edi
     45 
     46 	call	_C_LABEL(prot_to_real)
     47 	.code16
     48 
     49 	movb	$0, %ah
     50 	movb	$2, %al
     51 	int	$0x10
     52 	# zero-extend 16-bit result to 32 bits.
     53 	movl	$0, %ebx
     54 	movw	%ax,%bx
     55 
     56 	calll	_C_LABEL(real_to_prot)
     57 	.code32
     58 
     59 	movl	%ebx, %eax
     60 
     61 	pop	%edi
     62 	pop	%esi
     63 	popl	%ebx
     64 	popl	%ebp
     65 	ret
     66