apm_bioscall.s

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    1 /*-
    2  * Copyright (c) 1997 Jonathan Lemon
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  * $FreeBSD: releng/5.0/sys/pc98/apm/apm_bioscall.s 103436 2002-09-17 01:49:00Z peter $
   27  */
   28 
   29 /*
   30  * Functions for calling x86 BIOS functions from the BSD kernel
   31  */
   32         
   33 #include <machine/asmacros.h>
   34 
   35 #include "assym.s"
   36 
   37         .text
   38 
   39 /*
   40  * bios32_apm98(regs, offset, segment)
   41  *      struct bios_regs *regs;
   42  *      u_int offset;
   43  *      u_short segment;
   44  */
   45 ENTRY(bios32_apm98)
   46         pushl   %ebp
   47         movl    16(%esp),%ebp
   48         mov     %bp,bioscall_vector+4
   49         movl    12(%esp),%ebp
   50         movl    %ebp,bioscall_vector
   51         movl    8(%esp),%ebp
   52         pushl   %ebx
   53         pushl   %esi
   54         pushl   %edi
   55         movl    0(%ebp),%eax
   56         movl    4(%ebp),%ebx
   57         movl    8(%ebp),%ecx
   58         movl    12(%ebp),%edx
   59         movl    16(%ebp),%esi
   60         movl    20(%ebp),%edi
   61         pushl   %ebp
   62         pushfl
   63         cli
   64         lcall   *bioscall_vector
   65         movl    %eax,%edi
   66         movl    %edx,%esi
   67         lahf
   68         movl    apm_necsmm_addr,%edx
   69         andl    %edx,%edx
   70         jz      9f
   71         inb     %dx,%al
   72         andl    apm_necsmm_mask,%eax
   73         outb    %al,%dx
   74 9:      
   75         sti
   76         popl    %ebp
   77         movl    %edi,0(%ebp)
   78         movl    %ebx,4(%ebp)
   79         movl    %ecx,8(%ebp)
   80         movl    %esi,12(%ebp)
   81         movl    $0,16(%ebp)     /* esi is cannot get */
   82         movl    $0,20(%ebp)     /* edi is cannot get */
   83         movl    %edi,%eax
   84         andl    $0x100,%eax
   85         popl    %edi
   86         popl    %esi
   87         popl    %ebx
   88         popl    %ebp
   89         ret

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sys/pc98/apm/apm_bioscall.s