| 1 | /* $Id: CPUMR3Host-x86.cpp 109210 2025-05-08 22:09:06Z vboxsync $ */
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| 2 | /** @file
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| 3 | * CPUM - X86 Host Specific code.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2013-2024 Oracle and/or its affiliates.
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| 8 | *
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| 9 | * This file is part of VirtualBox base platform packages, as
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| 10 | * available from https://www.virtualbox.org.
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| 11 | *
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| 12 | * This program is free software; you can redistribute it and/or
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| 13 | * modify it under the terms of the GNU General Public License
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| 14 | * as published by the Free Software Foundation, in version 3 of the
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| 15 | * License.
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| 16 | *
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| 17 | * This program is distributed in the hope that it will be useful, but
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| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | * General Public License for more details.
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| 21 | *
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| 22 | * You should have received a copy of the GNU General Public License
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| 23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | *
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| 25 | * SPDX-License-Identifier: GPL-3.0-only
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| 26 | */
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| 27 |
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| 28 |
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| 29 | /*********************************************************************************************************************************
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| 30 | * Header Files *
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| 31 | *********************************************************************************************************************************/
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| 32 | #define LOG_GROUP LOG_GROUP_CPUM
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| 33 | #include <VBox/vmm/cpum.h>
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| 34 | #include "CPUMInternal.h"
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| 35 | #include <VBox/vmm/vmcc.h>
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| 36 |
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| 37 | #include <iprt/asm-amd64-x86.h>
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| 38 | #include <iprt/string.h>
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| 39 |
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| 40 |
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| 41 |
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| 42 | /**
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| 43 | * Determins the host CPU MXCSR mask.
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| 44 | *
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| 45 | * @returns MXCSR mask.
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| 46 | */
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| 47 | VMMR3DECL(uint32_t) CPUMR3DeterminHostMxCsrMask(void)
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| 48 | {
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| 49 | if ( ASMHasCpuId()
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| 50 | && RTX86IsValidStdRange(ASMCpuId_EAX(0))
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| 51 | && ASMCpuId_EDX(1) & X86_CPUID_FEATURE_EDX_FXSR)
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| 52 | {
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| 53 | uint8_t volatile abBuf[sizeof(X86FXSTATE) + 64];
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| 54 | PX86FXSTATE pState = (PX86FXSTATE)&abBuf[64 - ((uintptr_t)&abBuf[0] & 63)];
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| 55 | RT_ZERO(*pState);
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| 56 | ASMFxSave(pState);
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| 57 | if (pState->MXCSR_MASK == 0)
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| 58 | return 0xffbf;
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| 59 | return pState->MXCSR_MASK;
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| 60 | }
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| 61 | return 0;
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| 62 | }
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| 63 |
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