BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=4182
Adds SmmSmramSaveStateLib Library class in UefiCpuPkg.dec.
Adds function declaration header file.
Cc: Paul Grimes <paul.gri...@amd.com>
Cc: Garrett Kirkendall <garrett.kirkend...@amd.com>
Cc: Abner Chang <abner.ch...@amd.com>
Cc: Eric Dong <eric.d...@intel.com>
Cc: Ray Ni <ray...@intel.com>
Cc: Rahul Kumar <rahul1.ku...@intel.com>
Cc: Gerd Hoffmann <kra...@redhat.com>
Signed-off-by: Abdul Lateef Attar <abdat...@amd.com>
---
UefiCpuPkg/UefiCpuPkg.dec | 4 ++
.../Include/Library/SmmSmramSaveStateLib.h | 69 +++++++++++++++++++
2 files changed, 73 insertions(+)
create mode 100644 UefiCpuPkg/Include/Library/SmmSmramSaveStateLib.h
diff --git a/UefiCpuPkg/UefiCpuPkg.dec b/UefiCpuPkg/UefiCpuPkg.dec
index cff239d5283e..1de90b677828 100644
--- a/UefiCpuPkg/UefiCpuPkg.dec
+++ b/UefiCpuPkg/UefiCpuPkg.dec
@@ -2,6 +2,7 @@
# This Package provides UEFI compatible CPU modules and libraries.
#
# Copyright (c) 2007 - 2022, Intel Corporation. All rights reserved.<BR>
+# Copyright (C) 2023 Advanced Micro Devices, Inc. All rights reserved.<BR>
#
# SPDX-License-Identifier: BSD-2-Clause-Patent
#
@@ -65,6 +66,9 @@ [LibraryClasses.IA32, LibraryClasses.X64]
## @libraryclass Provides function for manipulating x86 paging structures.
CpuPageTableLib|Include/Library/CpuPageTableLib.h
+ ## @libraryclass Provides functions for manipulating Smram savestate
registers.
+ SmmSmramSaveSateLib|Include/Library/SmmSmramSaveStateLib.h
+
[Guids]
gUefiCpuPkgTokenSpaceGuid = { 0xac05bf33, 0x995a, 0x4ed4, { 0xaa, 0xb8,
0xef, 0x7a, 0xe8, 0xf, 0x5c, 0xb0 }}
gMsegSmramGuid = { 0x5802bce4, 0xeeee, 0x4e33, { 0xa1, 0x30,
0xeb, 0xad, 0x27, 0xf0, 0xe4, 0x39 }}
diff --git a/UefiCpuPkg/Include/Library/SmmSmramSaveStateLib.h
b/UefiCpuPkg/Include/Library/SmmSmramSaveStateLib.h
new file mode 100644
index 000000000000..d10eb064ceac
--- /dev/null
+++ b/UefiCpuPkg/Include/Library/SmmSmramSaveStateLib.h
@@ -0,0 +1,69 @@
+/** @file
+Library that provides service to read/write CPU specific smram save state
registers.
+
+Copyright (c) 2010 - 2019, Intel Corporation. All rights reserved.<BR>
+Copyright (C) 2023 Advanced Micro Devices, Inc. All rights reserved.<BR>
+
+SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef SMM_SMRAM_SAVE_STATE_LIB_H_
+#define SMM_SMRAM_SAVE_STATE_LIB_H_
+
+#include <Protocol/SmmCpu.h>
+#include <Uefi/UefiBaseType.h>
+
+/**
+ Read an SMM Save State register on the target processor. If this function
+ returns EFI_UNSUPPORTED, then the caller is responsible for reading the
+ SMM Save Sate register.
+
+ @param[in] CpuIndex The index of the CPU to read the SMM Save State. The
+ value must be between 0 and the NumberOfCpus field in
+ the System Management System Table (SMST).
+ @param[in] Register The SMM Save State register to read.
+ @param[in] Width The number of bytes to read from the CPU save state.
+ @param[out] Buffer Upon return, this holds the CPU register value read
+ from the save state.
+
+ @retval EFI_SUCCESS The register was read from Save State.
+ @retval EFI_INVALID_PARAMTER Buffer is NULL.
+ @retval EFI_UNSUPPORTED This function does not support reading
Register.
+
+**/
+EFI_STATUS
+EFIAPI
+SmramSaveStateReadRegister (
+ IN UINTN CpuIndex,
+ IN EFI_SMM_SAVE_STATE_REGISTER Register,
+ IN UINTN Width,
+ OUT VOID *Buffer
+ );
+
+/**
+ Writes an SMM Save State register on the target processor. If this function
+ returns EFI_UNSUPPORTED, then the caller is responsible for writing the
+ SMM Save Sate register.
+
+ @param[in] CpuIndex The index of the CPU to write the SMM Save State. The
+ value must be between 0 and the NumberOfCpus field in
+ the System Management System Table (SMST).
+ @param[in] Register The SMM Save State register to write.
+ @param[in] Width The number of bytes to write to the CPU save state.
+ @param[in] Buffer Upon entry, this holds the new CPU register value.
+
+ @retval EFI_SUCCESS The register was written to Save State.
+ @retval EFI_INVALID_PARAMTER Buffer is NULL.
+ @retval EFI_UNSUPPORTED This function does not support writing
Register.
+**/
+EFI_STATUS
+EFIAPI
+SmramSaveStateWriteRegister (
+ IN UINTN CpuIndex,
+ IN EFI_SMM_SAVE_STATE_REGISTER Register,
+ IN UINTN Width,
+ IN CONST VOID *Buffer
+ );
+
+#endif
--
2.25.1
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