818bc9596d
RFC: https://bugzilla.tianocore.org/show_bug.cgi?id=3429 Introduce basic Tdx functions in BaseLib: - TdCall () - TdVmCall () - TdIsEnabled () Cc: Michael D Kinney <michael.d.kinney@intel.com> Cc: Liming Gao <gaoliming@byosoft.com.cn> Cc: Zhiguang Liu <zhiguang.liu@intel.com> Cc: Brijesh Singh <brijesh.singh@amd.com> Cc: Erdem Aktas <erdemaktas@google.com> Cc: James Bottomley <jejb@linux.ibm.com> Cc: Jiewen Yao <jiewen.yao@intel.com> Cc: Tom Lendacky <thomas.lendacky@amd.com> Cc: Gerd Hoffmann <kraxel@redhat.com> Acked-by: Gerd Hoffmann <kraxel@redhat.com> Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn> Reviewed-by: Jiewen Yao <jiewen.yao@intel.com> Signed-off-by: Min Xu <min.m.xu@intel.com>
64 lines
1.5 KiB
C
64 lines
1.5 KiB
C
/** @file
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Copyright (c) 2020-2021, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <Library/BaseLib.h>
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#include <Register/Intel/Cpuid.h>
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/**
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Probe if TD is enabled.
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@return TRUE TD is enabled.
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@return FALSE TD is not enabled.
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**/
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BOOLEAN
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EFIAPI
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TdIsEnabled (
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)
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{
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UINT32 Eax;
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UINT32 Ebx;
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UINT32 Ecx;
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UINT32 Edx;
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UINT32 LargestEax;
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BOOLEAN TdEnabled;
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CPUID_VERSION_INFO_ECX CpuIdVersionInfoEcx;
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TdEnabled = FALSE;
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do {
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AsmCpuid (CPUID_SIGNATURE, &LargestEax, &Ebx, &Ecx, &Edx);
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if ( (Ebx != CPUID_SIGNATURE_GENUINE_INTEL_EBX)
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|| (Edx != CPUID_SIGNATURE_GENUINE_INTEL_EDX)
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|| (Ecx != CPUID_SIGNATURE_GENUINE_INTEL_ECX))
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{
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break;
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}
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AsmCpuid (CPUID_VERSION_INFO, NULL, NULL, &CpuIdVersionInfoEcx.Uint32, NULL);
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if (CpuIdVersionInfoEcx.Bits.ParaVirtualized == 0) {
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break;
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}
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if (LargestEax < CPUID_GUESTTD_RUNTIME_ENVIRONMENT) {
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break;
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}
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AsmCpuidEx (CPUID_GUESTTD_RUNTIME_ENVIRONMENT, 0, &Eax, &Ebx, &Ecx, &Edx);
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if ( (Ebx != CPUID_GUESTTD_SIGNATURE_GENUINE_INTEL_EBX)
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|| (Edx != CPUID_GUESTTD_SIGNATURE_GENUINE_INTEL_EDX)
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|| (Ecx != CPUID_GUESTTD_SIGNATURE_GENUINE_INTEL_ECX))
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{
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break;
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}
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TdEnabled = TRUE;
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} while (FALSE);
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return TdEnabled;
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}
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