[PATCH 2/4] SecurityPkg: introduce TpmIoLib to abstract TPM IO access

["Cohen, Eugene" <eugene@hp.com>]

SecurityPkg: introduce TpmIoLib to abstract TPM IO access
 
Contributed-under: TianoCore Contribution Agreement 1.1
Cc: Chao Zhang <chao.b.zhang@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Signed-off-by: Eugene Cohen <eugene@hp.com>
---
 SecurityPkg/Include/Library/TpmIoLib.h | 196 ++++++++++++++++++++
 1 file changed, 196 insertions(+)

diff --git a/SecurityPkg/Include/Library/TpmIoLib.h b/SecurityPkg/Include/Library/TpmIoLib.h
new file mode 100644
index 0000000..aaf0f0c
--- /dev/null
+++ b/SecurityPkg/Include/Library/TpmIoLib.h
@@ -0,0 +1,196 @@
+/** @file
+  This library is to abstract TPM2 register accesses so that a common
+  interface can be used for multiple underlying busses such as TPM,
+  SPI, or I2C access.
+
+Copyright (c) 2018 HP Development Company, L.P.
+This program and the accompanying materials
+are licensed and made available under the terms and conditions of the BSD License
+which accompanies this distribution.  The full text of the license may be found at
+http://opensource.org/licenses/bsd-license.php
+
+THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#ifndef _TPM_IO_LIB_H_
+#define _TPM_IO_LIB_H_
+
+#include <Base.h>
+
+
+/**
+  Reads an 8-bit TPM register.
+
+  Reads the 8-bit TPM register specified by Address. The 8-bit read value is
+  returned. This function must guarantee that all TPM read and write
+  operations are serialized.
+
+  If 8-bit TPM register operations are not supported, then ASSERT().
+
+  @param  Address The TPM register to read.
+
+  @return The value read.
+
+**/
+UINT8
+EFIAPI
+TpmRead8 (
+  IN      UINTN                     Address
+  );
+
+/**
+  Writes an 8-bit TPM register.
+
+  Writes the 8-bit TPM register specified by Address with the value specified
+  by Value and returns Value. This function must guarantee that all TPM read
+  and write operations are serialized.
+
+  If 8-bit TPM register operations are not supported, then ASSERT().
+
+  @param  Address The TPM register to write.
+  @param  Value   The value to write to the TPM register.
+
+  @return Value.
+
+**/
+UINT8
+EFIAPI
+TpmWrite8 (
+  IN      UINTN                     Address,
+  IN      UINT8                     Value
+  );
+
+/**
+  Reads a 16-bit TPM register.
+
+  Reads the 16-bit TPM register specified by Address. The 16-bit read value is
+  returned. This function must guarantee that all TPM read and write
+  operations are serialized.
+
+  If 16-bit TPM register operations are not supported, then ASSERT().
+  If Address is not aligned on a 16-bit boundary, then ASSERT().
+
+  @param  Address The TPM register to read.
+
+  @return The value read.
+
+**/
+UINT16
+EFIAPI
+TpmRead16 (
+  IN      UINTN                     Address
+  );
+
+/**
+  Writes a 16-bit TPM register.
+
+  Writes the 16-bit TPM register specified by Address with the value specified
+  by Value and returns Value. This function must guarantee that all TPM read
+  and write operations are serialized.
+
+  If 16-bit TPM register operations are not supported, then ASSERT().
+  If Address is not aligned on a 16-bit boundary, then ASSERT().
+
+  @param  Address The TPM register to write.
+  @param  Value   The value to write to the TPM register.
+
+  @return Value.
+
+**/
+UINT16
+EFIAPI
+TpmWrite16 (
+  IN      UINTN                     Address,
+  IN      UINT16                    Value
+  );
+
+/**
+  Reads a 32-bit TPM register.
+
+  Reads the 32-bit TPM register specified by Address. The 32-bit read value is
+  returned. This function must guarantee that all TPM read and write
+  operations are serialized.
+
+  If 32-bit TPM register operations are not supported, then ASSERT().
+  If Address is not aligned on a 32-bit boundary, then ASSERT().
+
+  @param  Address The TPM register to read.
+
+  @return The value read.
+
+**/
+UINT32
+EFIAPI
+TpmRead32 (
+  IN      UINTN                     Address
+  );
+
+/**
+  Writes a 32-bit TPM register.
+
+  Writes the 32-bit TPM register specified by Address with the value specified
+  by Value and returns Value. This function must guarantee that all TPM read
+  and write operations are serialized.
+
+  If 32-bit TPM register operations are not supported, then ASSERT().
+  If Address is not aligned on a 32-bit boundary, then ASSERT().
+
+  @param  Address The TPM register to write.
+  @param  Value   The value to write to the TPM register.
+
+  @return Value.
+
+**/
+UINT32
+EFIAPI
+TpmWrite32 (
+  IN      UINTN                     Address,
+  IN      UINT32                    Value
+  );
+
+
+/**
+  Reads a 64-bit TPM register.
+
+  Reads the 64-bit TPM register specified by Address. The 64-bit read value is
+  returned. This function must guarantee that all TPM read and write
+  operations are serialized.
+
+  If 64-bit TPM register operations are not supported, then ASSERT().
+  If Address is not aligned on a 64-bit boundary, then ASSERT().
+
+  @param  Address The TPM register to read.
+
+  @return The value read.
+
+**/
+UINT64
+EFIAPI
+TpmRead64 (
+  IN      UINTN                     Address
+  );
+
+/**
+  Writes a 64-bit TPM register.
+
+  Writes the 64-bit TPM register specified by Address with the value specified
+  by Value and returns Value. This function must guarantee that all TPM read
+  and write operations are serialized.
+
+  If 64-bit TPM register operations are not supported, then ASSERT().
+  If Address is not aligned on a 64-bit boundary, then ASSERT().
+
+  @param  Address The TPM register to write.
+  @param  Value   The value to write to the TPM register.
+
+**/
+UINT64
+EFIAPI
+TpmWrite64 (
+  IN      UINTN                     Address,
+  IN      UINT64                    Value
+  );
+
+#endif
-- 
2.7.4