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biosmem.S revision 1.6 
      1 /*	$NetBSD: biosmem.S,v 1.6 2003/02/01 14:48:18 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 
     36 #include <machine/asm.h>
     37 
     38 #define	data32	.byte 0x66
     39 
     40 	.text
     41 
     42 /* get mem below 1M, in kByte */
     43 
     44 ENTRY(getbasemem)
     45 	pushl	%ebp
     46 	movl	%esp,%ebp
     47 	pushl	%ebx
     48 	push	%esi
     49 	push	%edi
     50 
     51 	call	_C_LABEL(prot_to_real)
     52 	.code16
     53 
     54 	int	$0x12
     55 	# zero-extend 16-bit result to 32 bits.
     56 	movl	$0, %ebx
     57 	mov	%ax,%bx
     58 
     59 	calll	_C_LABEL(real_to_prot)
     60 	.code32
     61 
     62 	movl	%ebx, %eax
     63 
     64 	pop	%edi
     65 	pop	%esi
     66 	popl	%ebx
     67 	popl	%ebp
     68 	ret
     69 
     70 /* get mem above 1M, in kByte */
     71 
     72 ENTRY(getextmem1)
     73 	pushl	%ebp
     74 	movl	%esp,%ebp
     75 	pushl	%ebx
     76 	push	%esi
     77 	push	%edi
     78 
     79 	call	_C_LABEL(prot_to_real)
     80 	.code16
     81 
     82 	movb	$0x88,%ah
     83 	int	$0x15
     84 
     85 	# zero-extend 16-bit result to 32 bits.
     86 	movl	$0, %ebx
     87 	mov	%ax,%bx
     88 
     89 	calll	_C_LABEL(real_to_prot)
     90 	.code32
     91 
     92 	movl	%ebx, %eax
     93 
     94 	pop	%edi
     95 	pop	%esi
     96 	popl	%ebx
     97 	popl	%ebp
     98 	ret
     99 
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