1 files changed, 129 insertions, 0 deletions
diff --git a/roms/edk2/OvmfPkg/QemuFlashFvbServicesRuntimeDxe/FvbInfo.c b/roms/edk2/OvmfPkg/QemuFlashFvbServicesRuntimeDxe/FvbInfo.c
new file mode 100644
index 000000000..7a6dfb9c2
--- /dev/null
+++ b/roms/edk2/OvmfPkg/QemuFlashFvbServicesRuntimeDxe/FvbInfo.c
@@ -0,0 +1,129 @@
+/**@file
+
+  Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+  Module Name:
+
+    FvbInfo.c
+
+  Abstract:
+
+    Defines data structure that is the volume header found.These data is intent
+    to decouple FVB driver with FV header.
+
+**/
+
+//
+// The package level header files this module uses
+//
+#include <Pi/PiFirmwareVolume.h>
+
+//
+// The protocols, PPI and GUID definitions for this module
+//
+#include <Guid/SystemNvDataGuid.h>
+//
+// The Library classes this module consumes
+//
+#include <Library/BaseLib.h>
+#include <Library/PcdLib.h>
+
+typedef struct {
+  UINT64                      FvLength;
+  EFI_FIRMWARE_VOLUME_HEADER  FvbInfo;
+  //
+  // EFI_FV_BLOCK_MAP_ENTRY    ExtraBlockMap[n];//n=0
+  //
+  EFI_FV_BLOCK_MAP_ENTRY      End[1];
+} EFI_FVB_MEDIA_INFO;
+
+EFI_FVB_MEDIA_INFO  mPlatformFvbMediaInfo[] = {
+  //
+  // System NvStorage FVB
+  //
+  {
+    FixedPcdGet32 (PcdFlashNvStorageVariableSize) +
+    FixedPcdGet32 (PcdFlashNvStorageFtwWorkingSize) +
+    FixedPcdGet32 (PcdFlashNvStorageFtwSpareSize) +
+    FixedPcdGet32 (PcdOvmfFlashNvStorageEventLogSize),
+    {
+      {
+        0,
+      },  // ZeroVector[16]
+      EFI_SYSTEM_NV_DATA_FV_GUID,
+      FixedPcdGet32 (PcdFlashNvStorageVariableSize) +
+      FixedPcdGet32 (PcdFlashNvStorageFtwWorkingSize) +
+      FixedPcdGet32 (PcdFlashNvStorageFtwSpareSize) +
+      FixedPcdGet32 (PcdOvmfFlashNvStorageEventLogSize),
+      EFI_FVH_SIGNATURE,
+      EFI_FVB2_MEMORY_MAPPED |
+        EFI_FVB2_READ_ENABLED_CAP |
+        EFI_FVB2_READ_STATUS |
+        EFI_FVB2_WRITE_ENABLED_CAP |
+        EFI_FVB2_WRITE_STATUS |
+        EFI_FVB2_ERASE_POLARITY |
+        EFI_FVB2_ALIGNMENT_16,
+      sizeof (EFI_FIRMWARE_VOLUME_HEADER) + sizeof (EFI_FV_BLOCK_MAP_ENTRY),
+      0,  // CheckSum
+      0,  // ExtHeaderOffset
+      {
+        0,
+      },  // Reserved[1]
+      2,  // Revision
+      {
+        {
+          (FixedPcdGet32 (PcdFlashNvStorageVariableSize) +
+           FixedPcdGet32 (PcdFlashNvStorageFtwWorkingSize) +
+           FixedPcdGet32 (PcdFlashNvStorageFtwSpareSize) +
+           FixedPcdGet32 (PcdOvmfFlashNvStorageEventLogSize)) /
+          FixedPcdGet32 (PcdOvmfFirmwareBlockSize),
+          FixedPcdGet32 (PcdOvmfFirmwareBlockSize),
+        }
+      } // BlockMap[1]
+    },
+    {
+      {
+        0,
+        0
+      }
+    }  // End[1]
+  }
+};
+
+EFI_STATUS
+GetFvbInfo (
+  IN  UINT64                        FvLength,
+  OUT EFI_FIRMWARE_VOLUME_HEADER    **FvbInfo
+  )
+{
+  STATIC BOOLEAN Checksummed = FALSE;
+  UINTN Index;
+
+  if (!Checksummed) {
+    for (Index = 0;
+         Index < sizeof (mPlatformFvbMediaInfo) / sizeof (EFI_FVB_MEDIA_INFO);
+         Index += 1) {
+      UINT16 Checksum;
+      mPlatformFvbMediaInfo[Index].FvbInfo.Checksum = 0;
+      Checksum = CalculateCheckSum16 (
+                   (UINT16*) &mPlatformFvbMediaInfo[Index].FvbInfo,
+                   mPlatformFvbMediaInfo[Index].FvbInfo.HeaderLength
+                   );
+      mPlatformFvbMediaInfo[Index].FvbInfo.Checksum = Checksum;
+    }
+    Checksummed = TRUE;
+  }
+
+  for (Index = 0;
+       Index < sizeof (mPlatformFvbMediaInfo) / sizeof (EFI_FVB_MEDIA_INFO);
+       Index += 1) {
+    if (mPlatformFvbMediaInfo[Index].FvLength == FvLength) {
+      *FvbInfo = &mPlatformFvbMediaInfo[Index].FvbInfo;
+      return EFI_SUCCESS;
+    }
+  }
+
+  return EFI_NOT_FOUND;
+}