| 1 | /* $Id: bs3-cmn-ExtCtxGetSize.c 66419 2017-04-04 15:49:07Z vboxsync $ */
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| 2 | /** @file
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| 3 | * BS3Kit - Bs3ExtCtxGetSize
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2007-2017 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | *
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| 17 | * The contents of this file may alternatively be used under the terms
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| 18 | * of the Common Development and Distribution License Version 1.0
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| 19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | * VirtualBox OSE distribution, in which case the provisions of the
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| 21 | * CDDL are applicable instead of those of the GPL.
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| 22 | *
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| 23 | * You may elect to license modified versions of this file under the
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| 24 | * terms and conditions of either the GPL or the CDDL or both.
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| 25 | */
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| 26 |
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| 27 |
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| 28 | /*********************************************************************************************************************************
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| 29 | * Header Files *
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| 30 | *********************************************************************************************************************************/
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| 31 | #include "bs3kit-template-header.h"
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| 32 | #include <iprt/asm-amd64-x86.h>
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| 33 |
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| 34 |
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| 35 | #undef Bs3ExtCtxGetSize
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| 36 | BS3_CMN_DEF(uint16_t, Bs3ExtCtxGetSize,(uint64_t BS3_FAR *pfFlags))
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| 37 | {
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| 38 | uint32_t fEcx, fEdx;
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| 39 | *pfFlags = 0;
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| 40 |
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| 41 | ASMCpuIdExSlow(1, 0, 0, 0, NULL, NULL, &fEcx, &fEdx);
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| 42 | #if 1 /* To disable xsave/xrstor till IEM groks it... */
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| 43 | if (fEcx & X86_CPUID_FEATURE_ECX_XSAVE)
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| 44 | {
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| 45 | uint32_t fEax;
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| 46 | ASMCpuIdExSlow(13, 0, 0, 0, &fEax, NULL, &fEcx, &fEdx);
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| 47 | if ( fEcx >= sizeof(X86FXSTATE) + sizeof(X86XSAVEHDR)
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| 48 | && fEcx < _32K)
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| 49 | {
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| 50 | *pfFlags = fEax | ((uint64_t)fEdx << 32);
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| 51 | return RT_OFFSETOF(BS3EXTCTX, Ctx) + RT_ALIGN(fEcx, 256);
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| 52 | }
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| 53 | }
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| 54 | #endif
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| 55 | if (fEdx & X86_CPUID_FEATURE_EDX_FXSR)
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| 56 | return RT_OFFSETOF(BS3EXTCTX, Ctx) + sizeof(X86FXSTATE);
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| 57 | return RT_OFFSETOF(BS3EXTCTX, Ctx) + sizeof(X86FPUSTATE);
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| 58 | }
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| 59 |
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