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biosvideomode.S revision 1.2 
      1  1.1  tsarna 
      2  1.1  tsarna /*
      3  1.1  tsarna  * Copyright (c) 1996
      4  1.1  tsarna  * 	Perry E. Metzger.  All rights reserved.
      5  1.1  tsarna  *
      6  1.1  tsarna  * Redistribution and use in source and binary forms, with or without
      7  1.1  tsarna  * modification, are permitted provided that the following conditions
      8  1.1  tsarna  * are met:
      9  1.1  tsarna  * 1. Redistributions of source code must retain the above copyright
     10  1.1  tsarna  *    notice, this list of conditions and the following disclaimer.
     11  1.1  tsarna  * 2. Redistributions in binary form must reproduce the above copyright
     12  1.1  tsarna  *    notice, this list of conditions and the following disclaimer in the
     13  1.1  tsarna  *    documentation and/or other materials provided with the distribution.
     14  1.1  tsarna  * 3. All advertising materials mentioning features or use of this software
     15  1.1  tsarna  *    must display the following acknowledgements:
     16  1.1  tsarna  *	This product includes software developed for the NetBSD Project
     17  1.1  tsarna  *	by Perry E. Metzger.
     18  1.1  tsarna  * 4. The names of the authors may not be used to endorse or promote products
     19  1.1  tsarna  *    derived from this software without specific prior written permission.
     20  1.1  tsarna  *
     21  1.1  tsarna  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     22  1.1  tsarna  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     23  1.1  tsarna  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     24  1.1  tsarna  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     25  1.1  tsarna  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     26  1.1  tsarna  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     27  1.1  tsarna  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     28  1.1  tsarna  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     29  1.1  tsarna  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     30  1.1  tsarna  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     31  1.1  tsarna  *
     32  1.1  tsarna  */
     33  1.1  tsarna 
     34  1.1  tsarna 
     35  1.1  tsarna #include <machine/asm.h>
     36  1.1  tsarna 
     37  1.1  tsarna #define	data32	.byte 0x66
     38  1.1  tsarna 
     39  1.1  tsarna 	.text
     40  1.1  tsarna 
     41  1.1  tsarna ENTRY(biosvideomode)
     42  1.1  tsarna 	pushl	%ebp
     43  1.1  tsarna 	movl	%esp,%ebp
     44  1.1  tsarna 	pushl	%ebx
     45  1.1  tsarna 	push	%esi
     46  1.1  tsarna 	push	%edi
     47  1.1  tsarna 
     48  1.1  tsarna 	call	_C_LABEL(prot_to_real)
     49  1.2     dsl 	.code16
     50  1.1  tsarna 
     51  1.1  tsarna 	movb	$0, %ah
     52  1.1  tsarna 	movb	$2, %al
     53  1.1  tsarna 	int	$0x10
     54  1.1  tsarna 	# zero-extend 16-bit result to 32 bits.
     55  1.1  tsarna 	movl	$0, %ebx
     56  1.2     dsl 	movw	%ax,%bx
     57  1.1  tsarna 
     58  1.2     dsl 	calll	_C_LABEL(real_to_prot)
     59  1.2     dsl 	.code32
     60  1.1  tsarna 
     61  1.1  tsarna 	movl	%ebx, %eax
     62  1.1  tsarna 
     63  1.1  tsarna 	pop	%edi
     64  1.1  tsarna 	pop	%esi
     65  1.1  tsarna 	popl	%ebx
     66  1.1  tsarna 	popl	%ebp
     67  1.1  tsarna 	ret
     68