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biosmem.S revision 1.10 
      1 /*	$NetBSD: biosmem.S,v 1.10 2016/12/04 08:21:08 maxv 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 /*
     40  * Get mem below 1M, in kByte.
     41  */
     42 ENTRY(getbasemem)
     43 	pusha
     44 
     45 	call	_C_LABEL(prot_to_real)
     46 	.code16
     47 
     48 	int	$0x12
     49 	/* Zero-extend 16-bit result to 32 bits */
     50 	movzwl	%ax,%eax
     51 
     52 	calll	_C_LABEL(real_to_prot)
     53 	.code32
     54 
     55 	movl	%eax,28(%esp)
     56 	popa
     57 	ret
     58 
     59 /*
     60  * Get mem above 1M, in kByte.
     61  */
     62 ENTRY(getextmem1)
     63 	pusha
     64 
     65 	call	_C_LABEL(prot_to_real)
     66 	.code16
     67 
     68 	movb	$0x88,%ah
     69 	int	$0x15
     70 
     71 	/* Zero-extend 16-bit result to 32 bits */
     72 	movzwl	%ax,%eax
     73 
     74 	calll	_C_LABEL(real_to_prot)
     75 	.code32
     76 
     77 	movl	%eax,28(%esp)
     78 	popa
     79 	ret
     80 
     81