[PATCH 1/2] MdePkg/IndustryStandard: Add SMBIOS anchor string & length defines.

["Giri Mudusuru" <girim@apple.com>]

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REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3805

Add SMBIOS spec defined anchor strings & length defines.

 - '_SM_' chapter 5.2.1 SMBIOS 2.1 (32-bit) Entry Point
 - '_SM3_' chapter 5.2.2 SMBIOS 3.0 (64-bit) Entry Point

Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Zhiguang Liu <zhiguang.liu@intel.com>
Cc: Andrew Fish <afish@apple.com>
Signed-off-by: Giri Mudusuru <girim@apple.com>
---
 MdePkg/Include/IndustryStandard/SmBios.h | 22 ++++++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

diff --git a/MdePkg/Include/IndustryStandard/SmBios.h b/MdePkg/Include/IndustryStandard/SmBios.h
index 9cbdec1182..4c560e758b 100644
--- a/MdePkg/Include/IndustryStandard/SmBios.h
+++ b/MdePkg/Include/IndustryStandard/SmBios.h
@@ -48,6 +48,24 @@ SPDX-License-Identifier: BSD-2-Clause-Patent
 //
 #define SMBIOS_3_0_TABLE_MAX_LENGTH  0xFFFFFFFF
 
+///
+/// Reference SMBIOS 3.4, chapter 5.2.1 SMBIOS 2.1 (32-bit) Entry Point
+/// Table 1 – SMBIOS 2.1 (32-bit) Entry Point structure, offset 00h
+/// _SM_, specified as four ASCII characters (5F 53 4D 5F).
+///@{
+#define SMBIOS_ANCHOR_STRING         "_SM_"
+#define SMBIOS_ANCHOR_STRING_LENGTH  4
+///@}
+
+///
+/// Reference SMBIOS 3.4, chapter 5.2.2 SMBIOS 3.0 (64-bit) Entry Point
+/// Table 2 – SMBIOS 3.0 (64-bit) Entry Point structure, offset 00h
+/// _SM3_, specified as five ASCII characters (5F 53 4D 33 5F).
+///@{
+#define SMBIOS_3_0_ANCHOR_STRING         "_SM3_"
+#define SMBIOS_3_0_ANCHOR_STRING_LENGTH  5
+///@}
+
 //
 // SMBIOS type macros which is according to SMBIOS 3.3.0 specification.
 //
@@ -138,7 +156,7 @@ typedef UINT16 SMBIOS_HANDLE;
 ///
 #pragma pack(1)
 typedef struct {
-  UINT8     AnchorString[4];
+  UINT8     AnchorString[SMBIOS_ANCHOR_STRING_LENGTH];
   UINT8     EntryPointStructureChecksum;
   UINT8     EntryPointLength;
   UINT8     MajorVersion;
@@ -155,7 +173,7 @@ typedef struct {
 } SMBIOS_TABLE_ENTRY_POINT;
 
 typedef struct {
-  UINT8     AnchorString[5];
+  UINT8     AnchorString[SMBIOS_3_0_ANCHOR_STRING_LENGTH];
   UINT8     EntryPointStructureChecksum;
   UINT8     EntryPointLength;
   UINT8     MajorVersion;
-- 
2.39.2 (Apple Git-144)