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Diffstat (limited to '')
-rw-r--r-- | src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-ExtCtxGetSize.c | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-ExtCtxGetSize.c b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-ExtCtxGetSize.c new file mode 100644 index 00000000..69b9bf46 --- /dev/null +++ b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-ExtCtxGetSize.c @@ -0,0 +1,69 @@ +/* $Id: bs3-cmn-ExtCtxGetSize.c $ */ +/** @file + * BS3Kit - Bs3ExtCtxGetSize + */ + +/* + * 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 + */ + + +/********************************************************************************************************************************* +* Header Files * +*********************************************************************************************************************************/ +#include "bs3kit-template-header.h" +#include <iprt/asm-amd64-x86.h> + + +#undef Bs3ExtCtxGetSize +BS3_CMN_DEF(uint16_t, Bs3ExtCtxGetSize,(uint64_t BS3_FAR *pfFlags)) +{ + uint32_t fEcx, fEdx; + *pfFlags = 0; + + ASMCpuIdExSlow(1, 0, 0, 0, NULL, NULL, &fEcx, &fEdx); +#if 1 /* To disable xsave/xrstor till IEM groks it... */ + if (fEcx & X86_CPUID_FEATURE_ECX_XSAVE) + { + uint32_t fEax; + ASMCpuIdExSlow(13, 0, 0, 0, &fEax, NULL, &fEcx, &fEdx); + if ( fEcx >= sizeof(X86FXSTATE) + sizeof(X86XSAVEHDR) + && fEcx < _32K) + { + *pfFlags = fEax | ((uint64_t)fEdx << 32); + return RT_UOFFSETOF(BS3EXTCTX, Ctx) + RT_ALIGN(fEcx, 256); + } + } +#endif + if (fEdx & X86_CPUID_FEATURE_EDX_FXSR) + return RT_UOFFSETOF(BS3EXTCTX, Ctx) + sizeof(X86FXSTATE); + return RT_UOFFSETOF(BS3EXTCTX, Ctx) + sizeof(X86FPUSTATE); +} + |