The Smm Base HOB is used to store the relocated SmBase in
array for each Processors. If gSmmBaseHobGuid produced,
indicate SmBase for each Processors have been relocated.
The SmBase address in hob can be guaranteed the SMRAM state
save areas for all processors do not overlap.
Cc: Eric Dong <eric.d...@intel.com>
Cc: Ray Ni <ray...@intel.com>
Cc: Zeng Star <star.z...@intel.com>
Cc: Laszlo Ersek <ler...@redhat.com>
Cc: Gerd Hoffmann <kra...@redhat.com>
Cc: Rahul Kumar <rahul1.ku...@intel.com>
Signed-off-by: Jiaxin Wu <jiaxin...@intel.com>
---
UefiCpuPkg/Include/Guid/SmmBaseHob.h | 51 ++++++++++++++++++++++++++++++++++++
UefiCpuPkg/UefiCpuPkg.dec | 3 +++
2 files changed, 54 insertions(+)
create mode 100644 UefiCpuPkg/Include/Guid/SmmBaseHob.h
diff --git a/UefiCpuPkg/Include/Guid/SmmBaseHob.h
b/UefiCpuPkg/Include/Guid/SmmBaseHob.h
new file mode 100644
index 0000000000..090b22a274
--- /dev/null
+++ b/UefiCpuPkg/Include/Guid/SmmBaseHob.h
@@ -0,0 +1,51 @@
+/** @file
+ The Smm Base HOB is used to store the information of:
+ * The relocated SmBase in array for each Processors.
+
+ If gSmmBaseHobGuid produced, indicate SmBase for each Processors
+ have been relocated and SmBase in HOB can be guaranteed the SMRAM
+ state save areas for all processors do not overlap. SMM CPU driver
+ should retrieve the SMBASE addresses from this HOB and installs the
+ SMI handler at [SMBASE+8000h] for each processor instead of relocating
+ SMM Base addresses from SMRAM again.
+
+ With SMM Base Hob, SMM CPU driver doesn't need the RSM instruction
+ to reload the SMBASE register with the new allocated value in SMBASE
+ field each time it exits SMM. SMBASE Register for each processors
+ have already been programmed in parallel since the same default
+ SMBASE Address (0x30000) is not used, thus the CPUs over-writing
+ each other's SMM Save State Area will not happen. This way will save
+ boot time on multi-core system.
+
+ Copyright (c) 2023, Intel Corporation. All rights reserved.<BR>
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef SMM_BASE_HOB_H_
+#define SMM_BASE_HOB_H_
+
+#include <Protocol/MpService.h>
+#include <PiPei.h>
+
+#define SMM_BASE_HOB_DATA_GUID \
+ { \
+ 0xc2217ba7, 0x03bb, 0x4f63, {0xa6, 0x47, 0x7c, 0x25, 0xc5, 0xfc, 0x9d,
0x73} \
+ }
+
+#pragma pack(1)
+typedef struct {
+ ///
+ /// Describes the Number of all max supported processors.
+ ///
+ UINT64 NumberOfProcessors;
+ ///
+ /// Pointer to SmBase address for each Processors.
+ ///
+ UINT64 SmBase[];
+} SMM_BASE_HOB_DATA;
+#pragma pack()
+
+extern EFI_GUID gSmmBaseHobGuid;
+
+#endif
diff --git a/UefiCpuPkg/UefiCpuPkg.dec b/UefiCpuPkg/UefiCpuPkg.dec
index cff239d528..2afd08cdd2 100644
--- a/UefiCpuPkg/UefiCpuPkg.dec
+++ b/UefiCpuPkg/UefiCpuPkg.dec
@@ -76,10 +76,13 @@
gEdkiiCpuFeaturesInitDoneGuid = { 0xc77c3a41, 0x61ab, 0x4143, { 0x98, 0x3e,
0x33, 0x39, 0x28, 0x6, 0x28, 0xe5 }}
## Include/Guid/MicrocodePatchHob.h
gEdkiiMicrocodePatchHobGuid = { 0xd178f11d, 0x8716, 0x418e, { 0xa1, 0x31,
0x96, 0x7d, 0x2a, 0xc4, 0x28, 0x43 }}
+ ## Include/Guid/SmmBaseHob.h
+ gSmmBaseHobGuid = { 0xc2217ba7, 0x03bb, 0x4f63, {0xa6, 0x47, 0x7c,
0x25, 0xc5, 0xfc, 0x9d, 0x73 }}
+
[Protocols]
## Include/Protocol/SmmCpuService.h
gEfiSmmCpuServiceProtocolGuid = { 0x1d202cab, 0xc8ab, 0x4d5c, { 0x94,
0xf7, 0x3c, 0xfc, 0xc0, 0xd3, 0xd3, 0x35 }}
gEdkiiSmmCpuRendezvousProtocolGuid = { 0xaa00d50b, 0x4911, 0x428f, { 0xb9,
0x1a, 0xa5, 0x9d, 0xdb, 0x13, 0xe2, 0x4c }}
--
2.16.2.windows.1
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