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; $Id: bs3-cmn-SelFlatCodeToProtFar16.asm $
;; @file
; BS3Kit - Bs3SelFlatCodeToProtFar16.
;
;
; 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"
;*********************************************************************************************************************************
;* External Symbols *
;*********************************************************************************************************************************
BS3_EXTERN_CMN Bs3SelFlatCodeToRealMode
BS3_EXTERN_CMN Bs3SelRealModeCodeToProtMode
TMPL_BEGIN_TEXT
;;
; @cproto BS3_CMN_PROTO(uint32_t, Bs3SelRealModeCodeToProtMode,(uint32_t uFlatAddr), false);
;
; @uses Only return registers (ax:dx, eax, eax)
;
BS3_PROC_BEGIN_CMN Bs3SelFlatCodeToProtFar16, BS3_PBC_NEAR
BS3_CALL_CONV_PROLOG 1
push xBP
mov xBP, xSP
;
; Call Bs3SelFlatCodeToRealMode and then Bs3SelRealModeCodeToProtMode.
; This avoid some code duplication.
;
%if TMPL_BITS == 16
push word [xBP + xCB + cbCurRetAddr + 2]
push word [xBP + xCB + cbCurRetAddr]
call Bs3SelFlatCodeToRealMode
add sp, 4h
push ax ; save the offset as it will be the same.
push dx
call Bs3SelRealModeCodeToProtMode
add sp, 2h
mov dx, ax ; The protected mode selector.
pop ax ; The offset.
%elif TMPL_BITS == 32
push dword [xBP + xCB + cbCurRetAddr]
call Bs3SelFlatCodeToRealMode
add esp, 4h
push eax ; save the result.
shr eax, 16
push eax
call Bs3SelRealModeCodeToProtMode
add esp, 4h
mov [esp + 2], ax ; Update the selector before popping the result.
pop eax
%elif TMPL_BITS == 64
push xCX ; Preserve RCX to make the behaviour uniform.
sub xSP, 28h ; 20h bytes of calling convention scratch and 8 byte for saving the result.
mov ecx, [xBP + xCB + cbCurRetAddr] ; move straight to parameter 0 register.
call Bs3SelFlatCodeToRealMode
mov [xBP - xCB*2], eax ; Save the result.
shr eax, 16
mov ecx, eax ; Move straight to parameter 0 register.
call Bs3SelRealModeCodeToProtMode
shl eax, 16 ; Shift prot mode selector into result position.
mov ax, [xBP - xCB*2] ; The segment offset from the previous call.
add xSP, 28h
pop xCX
%else
%error "TMPL_BITS=" TMPL_BITS "!"
%endif
pop xBP
BS3_CALL_CONV_EPILOG 1
BS3_HYBRID_RET
BS3_PROC_END_CMN Bs3SelFlatCodeToProtFar16
;
; We may be using the near code in some critical code paths, so don't
; penalize it.
;
BS3_CMN_FAR_STUB Bs3SelFlatCodeToProtFar16, 4
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