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biosvideomode.S revision 1.2 
      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 
     41 ENTRY(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 	.code16
     50 
     51 	movb	$0, %ah
     52 	movb	$2, %al
     53 	int	$0x10
     54 	# zero-extend 16-bit result to 32 bits.
     55 	movl	$0, %ebx
     56 	movw	%ax,%bx
     57 
     58 	calll	_C_LABEL(real_to_prot)
     59 	.code32
     60 
     61 	movl	%ebx, %eax
     62 
     63 	pop	%edi
     64 	pop	%esi
     65 	popl	%ebx
     66 	popl	%ebp
     67 	ret
     68