[PATCH v2 4/4] ArmPlatformPkg: Add helpers for HEST table generation

["Omkar Anand Kulkarni" <omkar.kulkarni@arm.com>]

Add helper macros for the generation of the HEST ACPI table. Macros to
initialize the HEST GHESv2 Notification Structure and Error Status
Structure are introduced.

Signed-off-by: Omkar Anand Kulkarni <omkar.kulkarni@arm.com>
---
 ArmPlatformPkg/Include/HestAcpiHeader.h | 49 ++++++++++++++++++++
 1 file changed, 49 insertions(+)

diff --git a/ArmPlatformPkg/Include/HestAcpiHeader.h b/ArmPlatformPkg/Include/HestAcpiHeader.h
new file mode 100644
index 000000000000..5112ee5b22c5
--- /dev/null
+++ b/ArmPlatformPkg/Include/HestAcpiHeader.h
@@ -0,0 +1,49 @@
+/** @file
+  HEST table helper macros.
+
+  Macro definitions to initialize the HEST ACPI table specific structures.
+
+  Copyright (c) 2021, ARM Limited. All rights reserved.
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+  @par Specification Reference:
+    - ACPI Reference Specification 6.3
+    - UEFI Reference Specification 2.8
+**/
+
+#ifndef HEST_ACPI_HEADER_
+#define HEST_ACPI_HEADER_
+
+#include <IndustryStandard/Acpi.h>
+
+//
+// HEST table GHESv2 type related structures.
+//
+// Helper Macro to initialize the HEST GHESv2 Notification Structure.
+// Refer Table 18-394 in ACPI Specification, Version 6.3.
+#define EFI_ACPI_6_3_HARDWARE_ERROR_NOTIFICATION_STRUCTURE_INIT(Type,         \
+  PollInterval, EventId)                                                      \
+  {                                                                           \
+    Type,                                                                     \
+    sizeof (EFI_ACPI_6_3_HARDWARE_ERROR_NOTIFICATION_STRUCTURE),              \
+    {0, 0, 0, 0, 0, 0, 0}, /* ConfigurationWriteEnable */                     \
+    PollInterval,                                                             \
+    EventId,                                                                  \
+    0,                    /* Poll Interval Threshold Value  */                \
+    0,                    /* Poll Interval Threshold Window */                \
+    0,                    /* Error Threshold Value          */                \
+    0                     /* Error Threshold Window         */                \
+  }
+
+// Helper Macro to initialize the HEST GHESv2 Error Status Structure.
+// Refer Section 5.2.3.2 in ACPI Specification, Version 6.3.
+#define EFI_ACPI_6_3_GENERIC_ERROR_STATUS_STRUCTURE_INIT(Address)     \
+  {                                                                   \
+    0,        /* UINT8 Address Space ID */                            \
+    64,       /* Register Bit Width     */                            \
+    0,        /* Register Bit Offset    */                            \
+    4,        /* Access Size            */                            \
+    Address   /* CPER/Read Ack Addr     */                            \
+  }
+
+#endif /* HEST_ACPI_HEADER_ */
-- 
2.17.1