diff options
Diffstat (limited to 'src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-RegGetXcr0.asm')
| -rw-r--r-- | src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-RegGetXcr0.asm | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-RegGetXcr0.asm b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-RegGetXcr0.asm new file mode 100644 index 00000000..f717205d --- /dev/null +++ b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-RegGetXcr0.asm @@ -0,0 +1,77 @@ +; $Id: bs3-cmn-RegGetXcr0.asm $ +;; @file +; BS3Kit - Bs3RegGetXcr0 +; + +; +; 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" + + +;; +; @cproto BS3_CMN_PROTO_STUB(uint64_t, Bs3RegGetXcr0,(void)); +; +; @returns Register value. +; @remarks Does not require 20h of parameter scratch space in 64-bit mode. +; +; @uses No GPRs, though 16-bit mode the upper 48-bits of RAX, RDX and RCX are cleared. +; +BS3_PROC_BEGIN_CMN Bs3RegGetXcr0, BS3_PBC_HYBRID_SAFE + push xBP + mov xBP, xSP +TONLY64 push rdx + + ; Read the value. +TNOT16 push sCX + xor ecx, ecx + xgetbv +TNOT16 pop sCX + + ; Move the edx:eax value into the appropriate return register(s). +%if TMPL_BITS == 16 + ; value [dx cx bx ax] + ror eax, 16 + mov bx, ax + mov cx, dx + shr eax, 16 + shr edx, 16 +%elif TMPL_BITS == 64 + mov eax, eax + shr rdx, 32 + or rax, rdx +%endif + +TONLY64 pop rdx + pop xBP + BS3_HYBRID_RET +BS3_PROC_END_CMN Bs3RegGetXcr0 + |