[PATCH v3] MinPlatformPkg: Update HWSignature filed in FADT

["VincentX Ke" <vincentx.ke@intel.com>]

From: VincentX Ke <vincentx.ke@intel.com>

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4428

Calculating CRC based on checksum from all ACPI tables.
Update HWSignature filed in FADT based on CRC while ACPI table changed.

Signed-off-by: VincentX Ke <vincentx.ke@intel.com>
Cc: Chasel Chiu <chasel.chiu@intel.com>
Cc: Nate DeSimone <nathaniel.l.desimone@intel.com>
Cc: Isaac Oram <isaac.w.oram@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Eric Dong <eric.dong@intel.com>
---
 Platform/Intel/MinPlatformPkg/Acpi/AcpiTables/AcpiPlatform.c   | 110 +++++++++++++++++++-
 Platform/Intel/MinPlatformPkg/Acpi/AcpiTables/AcpiPlatform.inf |   1 +
 2 files changed, 110 insertions(+), 1 deletion(-)

diff --git a/Platform/Intel/MinPlatformPkg/Acpi/AcpiTables/AcpiPlatform.c b/Platform/Intel/MinPlatformPkg/Acpi/AcpiTables/AcpiPlatform.c
index e967031a3b..d84c1d4f6d 100644
--- a/Platform/Intel/MinPlatformPkg/Acpi/AcpiTables/AcpiPlatform.c
+++ b/Platform/Intel/MinPlatformPkg/Acpi/AcpiTables/AcpiPlatform.c
@@ -1285,6 +1285,108 @@ IsHardwareChange (
   FreePool (HWChange);
 }
 
+/**
+  This function calculates RCR based on Checksum from all ACPI tables.
+  It also calculates CRC and provides as HWSignature filed in FADT table.
+**/
+VOID
+IsAcpiTableChange (
+  VOID
+  )
+{
+  EFI_STATUS                                    Status;
+  UINTN                                         Index;
+  UINTN                                         AcpiTableCount;
+  UINT32                                        Table;
+  UINT32                                        CRC;
+  UINT32                                        *AcpiTable;
+  EFI_ACPI_6_5_ROOT_SYSTEM_DESCRIPTION_POINTER  *Rsdp;
+  EFI_ACPI_DESCRIPTION_HEADER                   *Rsdt;
+  EFI_ACPI_DESCRIPTION_HEADER                   *Xsdt;
+  EFI_ACPI_6_5_FIRMWARE_ACPI_CONTROL_STRUCTURE  *FacsPtr;
+  EFI_ACPI_6_5_FIXED_ACPI_DESCRIPTION_TABLE     *pFADT;
+
+  AcpiTableCount = 0;
+  AcpiTable      = NULL;
+  Rsdp           = NULL;
+  Rsdt           = NULL;
+  Xsdt           = NULL;
+  FacsPtr        = NULL;
+  pFADT          = NULL;
+
+  DEBUG ((DEBUG_INFO, "%a() - Start\n", __FUNCTION__));
+
+  Status = EfiGetSystemConfigurationTable (&gEfiAcpiTableGuid, (VOID **)&Rsdp);
+  if (EFI_ERROR (Status) || (Rsdp == NULL)) {
+    return;
+  }
+
+  //
+  // ACPI table count starts with 2 as RSDT and XSDT are already located.
+  // Then add ACPI tables found by XSDT and FADT.
+  //
+  Rsdt           = (EFI_ACPI_DESCRIPTION_HEADER *)(UINTN)Rsdp->RsdtAddress;
+  Xsdt           = (EFI_ACPI_DESCRIPTION_HEADER *)(UINTN)Rsdp->XsdtAddress;
+  AcpiTableCount = AcpiTableCount + 2;
+  AcpiTableCount = AcpiTableCount + (Xsdt->Length - sizeof (EFI_ACPI_DESCRIPTION_HEADER))/sizeof (UINT64);
+
+  for (Index = sizeof (EFI_ACPI_DESCRIPTION_HEADER); Index < (Xsdt->Length); Index = Index + sizeof (UINT64)) {
+    Table = *((UINT32 *)((UINT8 *)Xsdt + Index));
+    if (((EFI_ACPI_DESCRIPTION_HEADER *)(UINTN)Table)->Signature == EFI_ACPI_6_5_FIXED_ACPI_DESCRIPTION_TABLE_SIGNATURE) {
+      pFADT = (EFI_ACPI_6_5_FIXED_ACPI_DESCRIPTION_TABLE *)(UINTN)Table;
+      if ((pFADT->XDsdt != 0) || (pFADT->Dsdt != 0)) {
+        AcpiTableCount = AcpiTableCount + 1;
+      }
+    }
+  }
+
+  //
+  // Allocate memory for founded ACPI tables.
+  //
+  AcpiTable = AllocateZeroPool (sizeof (UINT32) * AcpiTableCount);
+  if (AcpiTable == NULL) {
+    return;
+  }
+
+  AcpiTableCount              = 0;
+  AcpiTable[AcpiTableCount++] = Rsdt->Checksum;
+  AcpiTable[AcpiTableCount++] = Xsdt->Checksum;
+
+  for (Index = sizeof (EFI_ACPI_DESCRIPTION_HEADER); Index < (Xsdt->Length); Index = Index + sizeof (UINT64)) {
+    Table                       = *((UINT32 *)((UINT8 *)Xsdt + Index));
+    AcpiTable[AcpiTableCount++] = ((EFI_ACPI_DESCRIPTION_HEADER *)(UINTN)Table)->Checksum;
+    if (((EFI_ACPI_DESCRIPTION_HEADER *)(UINTN)Table)->Signature == EFI_ACPI_6_5_FIXED_ACPI_DESCRIPTION_TABLE_SIGNATURE) {
+      pFADT = (EFI_ACPI_6_5_FIXED_ACPI_DESCRIPTION_TABLE *)(UINTN)Table;
+      if (pFADT->XDsdt != 0) {
+        AcpiTable[AcpiTableCount++] = ((EFI_ACPI_DESCRIPTION_HEADER *)(UINTN)pFADT->XDsdt)->Checksum;
+      } else {
+        AcpiTable[AcpiTableCount++] = ((EFI_ACPI_DESCRIPTION_HEADER *)(UINTN)pFADT->Dsdt)->Checksum;
+      }
+    }
+  }
+
+  //
+  // pFADT table not found.
+  //
+  if (pFADT == NULL) {
+    return;
+  }
+
+  //
+  // Calculate CRC value.
+  //
+  Status = gBS->CalculateCrc32 (AcpiTable, AcpiTableCount, &CRC);
+  DEBUG ((DEBUG_INFO, "CRC = %x and Status = %r\n", CRC, Status));
+
+  //
+  // Set HardwareSignature value based on CRC value.
+  //
+  FacsPtr                    = (EFI_ACPI_6_5_FIRMWARE_ACPI_CONTROL_STRUCTURE *)(UINTN)pFADT->FirmwareCtrl;
+  FacsPtr->HardwareSignature = CRC;
+  FreePool (AcpiTable);
+  DEBUG ((DEBUG_INFO, "%a() - End\n", __FUNCTION__));
+}
+
 VOID
 UpdateLocalTable (
   VOID
@@ -1329,7 +1431,13 @@ AcpiEndOfDxeEvent (
   //
   // Calculate Hardware Signature value based on current platform configurations
   //
-  IsHardwareChange ();
+  if ((PcdGet8 (PcdFadtMajorVersion) <= EFI_ACPI_6_3_FIXED_ACPI_DESCRIPTION_TABLE_REVISION) &&
+      (PcdGet8 (PcdFadtMinorVersion) <= EFI_ACPI_6_3_FIXED_ACPI_DESCRIPTION_TABLE_MINOR_REVISION))
+  {
+    IsHardwareChange ();
+  } else {
+    IsAcpiTableChange ();
+  }
 }
 
 /**
diff --git a/Platform/Intel/MinPlatformPkg/Acpi/AcpiTables/AcpiPlatform.inf b/Platform/Intel/MinPlatformPkg/Acpi/AcpiTables/AcpiPlatform.inf
index 694492112b..f47cc3908d 100644
--- a/Platform/Intel/MinPlatformPkg/Acpi/AcpiTables/AcpiPlatform.inf
+++ b/Platform/Intel/MinPlatformPkg/Acpi/AcpiTables/AcpiPlatform.inf
@@ -128,6 +128,7 @@
   gEfiGlobalVariableGuid                        ## CONSUMES
   gEfiHobListGuid                               ## CONSUMES
   gEfiEndOfDxeEventGroupGuid                    ## CONSUMES
+  gEfiAcpiTableGuid                             ## CONSUMES
 
 [Depex]
   gEfiAcpiTableProtocolGuid           AND
-- 
2.39.2.windows.1