SecurityPkg: Cache TPM interface type info
Cache TPM interface type info to avoid excessive interface ID register read Cc: Long Qin <qin.long@intel.com> Cc: Yao Jiewen <jiewen.yao@intel.com> Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Chao Zhang <chao.b.zhang@intel.com> Reviewed-by: Long Qin <qin.long@intel.com>
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@@ -3,7 +3,7 @@
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It can be registered to Tpm2 Device router, to be active TPM2 engine,
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based on platform setting.
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Copyright (c) 2013 - 2016, Intel Corporation. All rights reserved. <BR>
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Copyright (c) 2013 - 2018, Intel Corporation. All rights reserved. <BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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@@ -18,9 +18,22 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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#include <Library/BaseMemoryLib.h>
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#include <Library/DebugLib.h>
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#include <Library/Tpm2DeviceLib.h>
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#include <Library/PcdLib.h>
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#include <Guid/TpmInstance.h>
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/**
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Return PTP interface type.
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@param[in] Register Pointer to PTP register.
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@return PTP interface type.
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**/
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TPM2_PTP_INTERFACE_TYPE
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Tpm2GetPtpInterface (
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IN VOID *Register
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);
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/**
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Dump PTP register information.
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@@ -72,7 +85,7 @@ TPM2_DEVICE_INTERFACE mDTpm2InternalTpm2Device = {
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};
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/**
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The function register DTPM2.0 instance.
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The function register DTPM2.0 instance and caches current active TPM interface type.
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@retval EFI_SUCCESS DTPM2.0 instance is registered, or system dose not surpport registr DTPM2.0 instance
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**/
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@@ -82,7 +95,8 @@ Tpm2InstanceLibDTpmConstructor (
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VOID
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)
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{
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EFI_STATUS Status;
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EFI_STATUS Status;
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TPM2_PTP_INTERFACE_TYPE PtpInterface;
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Status = Tpm2RegisterTpm2DeviceLib (&mDTpm2InternalTpm2Device);
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if ((Status == EFI_SUCCESS) || (Status == EFI_UNSUPPORTED)) {
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@@ -90,6 +104,13 @@ Tpm2InstanceLibDTpmConstructor (
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// Unsupported means platform policy does not need this instance enabled.
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//
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if (Status == EFI_SUCCESS) {
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//
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// Cache current active TpmInterfaceType only when needed
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//
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if (PcdGet8(PcdActiveTpmInterfaceType) == 0xFF) {
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PtpInterface = Tpm2GetPtpInterface ((VOID *) (UINTN) PcdGet64 (PcdTpmBaseAddress));
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PcdSet8S(PcdActiveTpmInterfaceType, PtpInterface);
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}
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DumpPtpInfo ((VOID *) (UINTN) PcdGet64 (PcdTpmBaseAddress));
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}
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return EFI_SUCCESS;
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