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/** @file
* IPRT - X86 and AMD64 Helpers.
*/
/*
* Copyright (C) 2006-2025 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
*/
#ifndef IPRT_INCLUDED_x86_helpers_h
#define IPRT_INCLUDED_x86_helpers_h
#ifndef RT_WITHOUT_PRAGMA_ONCE
# pragma once
#endif
#include <iprt/types.h>
/** @defgroup grp_rt_x86_helpers x86 Helper Functions
* @ingroup grp_rt_x86
* @{
*/
/**
* Tests if it a genuine Intel CPU based on the ASMCpuId(0) output.
*
* @returns true/false.
* @param uEBX EBX return from ASMCpuId(0)
* @param uECX ECX return from ASMCpuId(0)
* @param uEDX EDX return from ASMCpuId(0)
*/
DECLINLINE(bool) RTX86IsIntelCpu(uint32_t uEBX, uint32_t uECX, uint32_t uEDX)
{
/* 'GenuineIntel' */
return uEBX == UINT32_C(0x756e6547) /* 'Genu' */
&& uEDX == UINT32_C(0x49656e69) /* 'ineI' */
&& uECX == UINT32_C(0x6c65746e); /* 'ntel' */
}
/**
* Tests if it an authentic AMD CPU based on the ASMCpuId(0) output.
*
* @returns true/false.
* @param uEBX EBX return from ASMCpuId(0)
* @param uECX ECX return from ASMCpuId(0)
* @param uEDX EDX return from ASMCpuId(0)
*/
DECLINLINE(bool) RTX86IsAmdCpu(uint32_t uEBX, uint32_t uECX, uint32_t uEDX)
{
/* 'AuthenticAMD' */
return uEBX == UINT32_C(0x68747541) /* 'Auth' */
&& uEDX == UINT32_C(0x69746e65) /* 'enti' */
&& uECX == UINT32_C(0x444d4163); /* 'dAMD' */
}
/**
* Tests if it a centaur hauling VIA CPU based on the ASMCpuId(0) output.
*
* @returns true/false.
* @param uEBX EBX return from ASMCpuId(0).
* @param uECX ECX return from ASMCpuId(0).
* @param uEDX EDX return from ASMCpuId(0).
*/
DECLINLINE(bool) RTX86IsViaCentaurCpu(uint32_t uEBX, uint32_t uECX, uint32_t uEDX)
{
/* 'CentaurHauls' */
return uEBX == UINT32_C(0x746e6543) /* 'Cent' */
&& uEDX == UINT32_C(0x48727561) /* 'aurH' */
&& uECX == UINT32_C(0x736c7561); /* 'auls' */
}
/**
* Tests if it a Shanghai CPU based on the ASMCpuId(0) output.
*
* @returns true/false.
* @param uEBX EBX return from ASMCpuId(0).
* @param uECX ECX return from ASMCpuId(0).
* @param uEDX EDX return from ASMCpuId(0).
*/
DECLINLINE(bool) RTX86IsShanghaiCpu(uint32_t uEBX, uint32_t uECX, uint32_t uEDX)
{
/* ' Shanghai ' */
return uEBX == UINT32_C(0x68532020) /* ' Sh' */
&& uEDX == UINT32_C(0x68676e61) /* 'angh' */
&& uECX == UINT32_C(0x20206961); /* 'ai ' */
}
/**
* Tests if it a genuine Hygon CPU based on the ASMCpuId(0) output.
*
* @returns true/false.
* @param uEBX EBX return from ASMCpuId(0)
* @param uECX ECX return from ASMCpuId(0)
* @param uEDX EDX return from ASMCpuId(0)
*/
DECLINLINE(bool) RTX86IsHygonCpu(uint32_t uEBX, uint32_t uECX, uint32_t uEDX)
{
/* 'HygonGenuine' */
return uEBX == UINT32_C(0x6f677948) /* Hygo */
&& uECX == UINT32_C(0x656e6975) /* uine */
&& uEDX == UINT32_C(0x6e65476e); /* nGen */
}
/**
* Checks whether ASMCpuId_EAX(0x00000000) indicates a valid range.
*
*
* @returns true/false.
* @param uEAX The EAX value of CPUID leaf 0x00000000.
*
* @note This only succeeds if there are at least two leaves in the range.
* @remarks The upper range limit is just some half reasonable value we've
* picked out of thin air.
*/
DECLINLINE(bool) RTX86IsValidStdRange(uint32_t uEAX)
{
return uEAX >= UINT32_C(0x00000001) && uEAX <= UINT32_C(0x000fffff);
}
/**
* Checks whether ASMCpuId_EAX(0x80000000) indicates a valid range.
*
* This only succeeds if there are at least two leaves in the range.
*
* @returns true/false.
* @param uEAX The EAX value of CPUID leaf 0x80000000.
*
* @note This only succeeds if there are at least two leaves in the range.
* @remarks The upper range limit is just some half reasonable value we've
* picked out of thin air.
*/
DECLINLINE(bool) RTX86IsValidExtRange(uint32_t uEAX)
{
return uEAX >= UINT32_C(0x80000001) && uEAX <= UINT32_C(0x800fffff);
}
/**
* Checks whether ASMCpuId_EAX(0x40000000) indicates a valid range.
*
* This only succeeds if there are at least two leaves in the range.
*
* @returns true/false.
* @param uEAX The EAX value of CPUID leaf 0x40000000.
*
* @note Unlike RTX86IsValidStdRange() and RTX86IsValidExtRange(), a single
* leaf is okay here. So, you always need to check the range.
* @remarks The upper range limit is take from the intel docs.
*/
DECLINLINE(bool) RTX86IsValidHypervisorRange(uint32_t uEAX)
{
return uEAX >= UINT32_C(0x40000000) && uEAX <= UINT32_C(0x4fffffff);
}
/**
* Extracts the CPU family from ASMCpuId(1) or ASMCpuId(0x80000001)
*
* @returns Family.
* @param uEAX EAX return from ASMCpuId(1) or ASMCpuId(0x80000001).
*/
DECLINLINE(uint32_t) RTX86GetCpuFamily(uint32_t uEAX)
{
return ((uEAX >> 8) & 0xf) == 0xf
? ((uEAX >> 20) & 0x7f) + 0xf
: ((uEAX >> 8) & 0xf);
}
/**
* Extracts the CPU model from ASMCpuId(1) or ASMCpuId(0x80000001), Intel variant.
*
* @returns Model.
* @param uEAX EAX from ASMCpuId(1) or ASMCpuId(0x80000001).
*/
DECLINLINE(uint32_t) RTX86GetCpuModelIntel(uint32_t uEAX)
{
return ((uEAX >> 8) & 0xf) == 0xf || (((uEAX >> 8) & 0xf) == 0x6) /* family! */
? ((uEAX >> 4) & 0xf) | ((uEAX >> 12) & 0xf0)
: ((uEAX >> 4) & 0xf);
}
/**
* Extracts the CPU model from ASMCpuId(1) or ASMCpuId(0x80000001), AMD variant.
*
* @returns Model.
* @param uEAX EAX from ASMCpuId(1) or ASMCpuId(0x80000001).
*/
DECLINLINE(uint32_t) RTX86GetCpuModelAMD(uint32_t uEAX)
{
return ((uEAX >> 8) & 0xf) == 0xf
? ((uEAX >> 4) & 0xf) | ((uEAX >> 12) & 0xf0)
: ((uEAX >> 4) & 0xf);
}
/**
* Extracts the CPU model from ASMCpuId(1) or ASMCpuId(0x80000001)
*
* @returns Model.
* @param uEAX EAX from ASMCpuId(1) or ASMCpuId(0x80000001).
* @param fIntel Whether it's an intel CPU. Use RTX86IsIntelCpu() or
* RTX86IsIntelCpu().
*/
DECLINLINE(uint32_t) RTX86GetCpuModel(uint32_t uEAX, bool fIntel)
{
return ((uEAX >> 8) & 0xf) == 0xf || (((uEAX >> 8) & 0xf) == 0x6 && fIntel) /* family! */
? ((uEAX >> 4) & 0xf) | ((uEAX >> 12) & 0xf0)
: ((uEAX >> 4) & 0xf);
}
/**
* Extracts the CPU stepping from ASMCpuId(1) or ASMCpuId(0x80000001)
*
* @returns Model.
* @param uEAX EAX from ASMCpuId(1) or ASMCpuId(0x80000001).
*/
DECLINLINE(uint32_t) RTX86GetCpuStepping(uint32_t uEAX)
{
return uEAX & 0xf;
}
/** @} */
#endif /* !IPRT_INCLUDED_x86_helpers_h */
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