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/* $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);
}
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