; $Id: bs3-cmn-SwitchToRing2.asm 59287 2016-01-08 10:08:40Z vboxsync $
;; @file
; BS3Kit - Bs3SwitchToRing2
;

;
; Copyright (C) 2007-2015 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.
;

%include "bs3kit-template-header.mac"

;;
; @cproto   BS3_DECL(void) Bs3SwitchToRing2(void);
;
; @remarks  Does not require 20h of parameter scratch space in 64-bit mode.
;
BS3_PROC_BEGIN_CMN Bs3SwitchToRing2
        push    sAX

        mov     ax, cs
        and     ax, 3
        cmp     ax, 2
        je      .return

        mov     eax, BS3_SYSCALL_TO_RING2
        int     BS3_TRAP_SYSCALL

.return:
        pop     sAX
        ret
BS3_PROC_END_CMN   Bs3SwitchToRing2

