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|
; $Id: bs3-cmn-ExtCtxRestoreEx.asm $
;; @file
; BS3Kit - Bs3ExtCtxRestoreEx.
;
;
; Copyright (C) 2007-2023 Oracle and/or its affiliates.
;
; This file is part of VirtualBox base platform packages, as
; available from https://www.virtualbox.org.
;
; This program is free software; you can redistribute it and/or
; modify it under the terms of the GNU General Public License
; as published by the Free Software Foundation, in version 3 of the
; License.
;
; This program is distributed in the hope that it will be useful, but
; WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
; General Public License for more details.
;
; You should have received a copy of the GNU General Public License
; along with this program; if not, see <https://www.gnu.org/licenses>.
;
; The contents of this file may alternatively be used under the terms
; of the Common Development and Distribution License Version 1.0
; (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
; in the VirtualBox 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.
;
; SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
;
%include "bs3kit-template-header.mac"
%if ARCH_BITS != 64
BS3_EXTERN_DATA16 g_bBs3CurrentMode
BS3_BEGIN_TEXT64
extern _Bs3ExtCtxRestore_c64
%if ARCH_BITS == 16
extern BS3_CMN_NM(Bs3SelProtFar16DataToFlat)
extern _Bs3SwitchTo16Bit_c64
%else
extern _Bs3SwitchTo32Bit_c64
%endif
TMPL_BEGIN_TEXT
extern BS3_CMN_NM(Bs3SwitchTo64Bit)
%if ARCH_BITS == 16
extern BS3_CMN_NM(Bs3SelProtFar16DataToFlat)
%endif
%endif
extern BS3_CMN_NM(Bs3ExtCtxRestore)
;;
; Restores the extended CPU context (FPU, SSE, AVX, ++), full 64-bit
; when in long mode.
;
; @param pExtCtx
;
BS3_PROC_BEGIN_CMN Bs3ExtCtxRestoreEx, BS3_PBC_NEAR
%if ARCH_BITS == 64
jmp BS3_CMN_NM(Bs3ExtCtxRestore)
%else
push xBP
mov xBP, xSP
push sAX
;
; Check if we're in long mode.
;
mov al, [BS3_DATA16_WRT(g_bBs3CurrentMode)]
and al, BS3_MODE_SYS_MASK
cmp al, BS3_MODE_SYS_LM
je .in_long_mode
;
; Not in long mode, so do normal restore.
;
pop sAX
leave
jmp BS3_CMN_NM(Bs3ExtCtxRestore)
;
; Switch to 64-bit to do the restoring so we can restore 64-bit only state.
;
.in_long_mode:
push sCX
BONLY16 push sDX
; Load ecx with the flat pExtCtx address.
mov ecx, [xBP + xCB + cbCurRetAddr]
%if ARCH_BITS == 16
push ecx
call BS3_CMN_NM(Bs3SelProtFar16DataToFlat)
mov ecx, edx
shl ecx, 16
mov cx, ax
%endif
; Switch to 64-bit mode.
call BS3_CMN_NM(Bs3SwitchTo64Bit)
BITS 64
; Do the restore.
sub rsp, 20h
call _Bs3ExtCtxRestore_c64
add rsp, 20h
; Switch back to the original mode.
%if ARCH_BITS == 16
call _Bs3SwitchTo16Bit_c64
%else
call _Bs3SwitchTo32Bit_c64
%endif
BITS ARCH_BITS
; Restore context and return.
BONLY16 pop sDX
pop sCX
pop sAX
leave
ret
%endif
BS3_PROC_END_CMN Bs3ExtCtxRestoreEx
|
