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MdePkg: Introduce basic Tdx functions in BaseLib

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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>
This commit is contained in:
Min Xu
2021-11-10 09:00:41 +08:00
committed by mergify[bot]
parent 77228269e7
commit 818bc9596d
6 changed files with 446 additions and 0 deletions
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63
MdePkg/Library/BaseLib/X64/TdProbe.c Normal file
View File

@ -0,0 +1,63 @@
/** @file
Copyright (c) 2020-2021, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <Library/BaseLib.h>
#include <Register/Intel/Cpuid.h>
/**
Probe if TD is enabled.
@return TRUE TD is enabled.
@return FALSE TD is not enabled.
**/
BOOLEAN
EFIAPI
TdIsEnabled (
)
{
UINT32 Eax;
UINT32 Ebx;
UINT32 Ecx;
UINT32 Edx;
UINT32 LargestEax;
BOOLEAN TdEnabled;
CPUID_VERSION_INFO_ECX CpuIdVersionInfoEcx;
TdEnabled = FALSE;
do {
AsmCpuid (CPUID_SIGNATURE, &LargestEax, &Ebx, &Ecx, &Edx);
if ( (Ebx != CPUID_SIGNATURE_GENUINE_INTEL_EBX)
|| (Edx != CPUID_SIGNATURE_GENUINE_INTEL_EDX)
|| (Ecx != CPUID_SIGNATURE_GENUINE_INTEL_ECX))
{
break;
}
AsmCpuid (CPUID_VERSION_INFO, NULL, NULL, &CpuIdVersionInfoEcx.Uint32, NULL);
if (CpuIdVersionInfoEcx.Bits.ParaVirtualized == 0) {
break;
}
if (LargestEax < CPUID_GUESTTD_RUNTIME_ENVIRONMENT) {
break;
}
AsmCpuidEx (CPUID_GUESTTD_RUNTIME_ENVIRONMENT, 0, &Eax, &Ebx, &Ecx, &Edx);
if ( (Ebx != CPUID_GUESTTD_SIGNATURE_GENUINE_INTEL_EBX)
|| (Edx != CPUID_GUESTTD_SIGNATURE_GENUINE_INTEL_EDX)
|| (Ecx != CPUID_GUESTTD_SIGNATURE_GENUINE_INTEL_ECX))
{
break;
}
TdEnabled = TRUE;
} while (FALSE);
return TdEnabled;
}