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; $Id: bs3-c16-SwitchFromV86To16BitAndCallC.asm $
;; @file
; BS3Kit - Bs3SwitchFromV86To16BitAndCallC
;
;
; Copyright (C) 2007-2019 Oracle Corporation
;
; This file is part of VirtualBox Open Source Edition (OSE), as
; available from http://www.virtualbox.org. This file is free software;
; you can redistribute it and/or modify it under the terms of the GNU
; General Public License (GPL) as published by the Free Software
; Foundation, in version 2 as it comes in the "COPYING" file of the
; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
;
; The contents of this file may alternatively be used under the terms
; of the Common Development and Distribution License Version 1.0
; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
; VirtualBox OSE distribution, in which case the provisions of the
; CDDL are applicable instead of those of the GPL.
;
; You may elect to license modified versions of this file under the
; terms and conditions of either the GPL or the CDDL or both.
;
;*********************************************************************************************************************************
;* Header Files *
;*********************************************************************************************************************************
%include "bs3kit-template-header.mac"
%if TMPL_BITS != 16
%error "16-bit only"
%endif
;*********************************************************************************************************************************
;* External Symbols *
;*********************************************************************************************************************************
%ifdef BS3_STRICT
BS3_EXTERN_DATA16 g_bBs3CurrentMode
TMPL_BEGIN_TEXT
BS3_EXTERN_CMN Bs3Panic
%endif
BS3_EXTERN_CMN Bs3SwitchTo16Bit
BS3_EXTERN_CMN Bs3SwitchTo16BitV86
BS3_EXTERN_CMN Bs3SelRealModeCodeToProtMode
;;
; @cproto BS3_CMN_PROTO_STUB(int, Bs3SwitchFromV86To16BitAndCallC,(FPFNBS3FAR fpfnCall, unsigned cbParams, ...));
;
BS3_PROC_BEGIN_CMN Bs3SwitchFromV86To16BitAndCallC, BS3_PBC_HYBRID
inc bp
push bp
mov bp, sp
;
; Push the arguments first.
;
mov ax, si ; save si
mov si, [bp + 2 + cbCurRetAddr + 4]
%ifdef BS3_STRICT
test si, 1
jz .cbParams_ok
call Bs3Panic
.cbParams_ok:
test byte [g_bBs3CurrentMode], BS3_MODE_CODE_V86
jnz .mode_ok
call Bs3Panic
.mode_ok:
%endif
.push_more:
push word [bp + 2 + cbCurRetAddr + 4 + 2 + si - 2]
sub si, 2
jnz .push_more
mov si, ax ; restore si
;
; Convert the code segment to a 16-bit prot mode selector
;
push word [bp + 2 + cbCurRetAddr + 2]
call Bs3SelRealModeCodeToProtMode
mov [bp + 2 + cbCurRetAddr + 2], ax
add sp, 2
;
; Switch mode.
;
call Bs3SwitchTo16Bit
call far [bp + 2 + cbCurRetAddr]
call Bs3SwitchTo16BitV86
mov sp, bp
pop bp
dec bp
BS3_HYBRID_RET
BS3_PROC_END_CMN Bs3SwitchFromV86To16BitAndCallC
|
