95 lines
2.6 KiB
ArmAsm
95 lines
2.6 KiB
ArmAsm
/* $NetBSD: pnpbioscall.s,v 1.1 1999/11/12 18:36:46 drochner Exp $ */
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/*
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* Copyright (c) 1999
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* Matthias Drochner. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "assym.h"
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#include <machine/asm.h>
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#include <machine/segments.h>
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.data
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saveesp:
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.space 4
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NENTRY(pnpbioscall)
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pushl %ebp
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movl %esp, %ebp
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/*
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* disable interrupts - our handlers can't deal with frames of the
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* segment we are calling, and the BIOS can't use our IDT anyway
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*/
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pushfl
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cli
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/* call pnpbiostramp() */
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lcall $GSEL(GPNPBIOSTRAMP_SEL, SEL_KPL), $0
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popfl
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popl %ebp
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ret
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NENTRY(pnpbiostramp)
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pushl %ebx
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/* save current stack pointer */
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movl %esp, %eax
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movl %eax, saveesp
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/* switch to new stack */
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movl 8(%ebp), %esp /* call argument */
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movl $GSEL(GPNPBIOSSCRATCH_SEL, SEL_KPL), %eax
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mov %ax, %ss
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/* fake the call return address (16-bit frame) */
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mov %cs, %ax
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push %ax
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movl $(1f - _C_LABEL(pnpbiostramp)), %eax
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push %ax
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/* do a long jump */
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pushl $GSEL(GPNPBIOSCODE_SEL, SEL_KPL)
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pushl (_C_LABEL(pnpbios_entry))
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#if 1
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/* paranoia: don't pass our ds */
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movl $GSEL(GPNPBIOSSCRATCH_SEL, SEL_KPL), %eax
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mov %ax, %ds
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#endif
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lret
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1: /* returned from BIOS call */
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movl $GSEL(GDATA_SEL, SEL_KPL), %ebx
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#if 1
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mov %bx, %ds
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#endif
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/* back to old stack */
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mov %bx, %ss
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movl saveesp, %ebx
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movl %ebx, %esp
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popl %ebx
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lret
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.globl _C_LABEL(epnpbiostramp)
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_C_LABEL(epnpbiostramp):
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