From a4ce9ffd470dbbab07ad1a9caeab5049b5a4bb6a Mon Sep 17 00:00:00 2001
From: Jordan Justen <jordan.l.justen@intel.com>
Date: Tue, 12 Nov 2013 18:34:52 +0000
Subject: OvmfPkg: Add QemuFlashFvbServicesRuntimeDxe driver

If QEMU flash is detected, this module will install
FirmwareVolumeBlock support for the QEMU flash device.

It will also set PCDs with the results that:
1. OvmfPkg/EmuVariableFvbRuntimeDxe will be disabled
2. MdeModulePkg variable services will read/write flash directly

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Acked-by: Laszlo Ersek <lersek@redhat.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@14839 6f19259b-4bc3-4df7-8a09-765794883524
---
 OvmfPkg/QemuFlashFvbServicesRuntimeDxe/FvbInfo.c | 137 +++++++++++++++++++++++
 1 file changed, 137 insertions(+)
 create mode 100644 OvmfPkg/QemuFlashFvbServicesRuntimeDxe/FvbInfo.c

(limited to 'OvmfPkg/QemuFlashFvbServicesRuntimeDxe/FvbInfo.c')

diff --git a/OvmfPkg/QemuFlashFvbServicesRuntimeDxe/FvbInfo.c b/OvmfPkg/QemuFlashFvbServicesRuntimeDxe/FvbInfo.c
new file mode 100644
index 0000000000..72845f9555
--- /dev/null
+++ b/OvmfPkg/QemuFlashFvbServicesRuntimeDxe/FvbInfo.c
@@ -0,0 +1,137 @@
+/**@file
+
+Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
+This program and the accompanying materials                          
+are licensed and made available under the terms and conditions of the BSD License         
+which accompanies this distribution.  The full text of the license may be found at        
+http://opensource.org/licenses/bsd-license.php                                            
+                                                                                          
+THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,                     
+WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.             
+
+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 <PiDxe.h>
+//
+// The protocols, PPI and GUID defintions for this module
+//
+#include <Guid/EventGroup.h>
+#include <Guid/FirmwareFileSystem2.h>
+#include <Guid/SystemNvDataGuid.h>
+#include <Protocol/FirmwareVolumeBlock.h>
+#include <Protocol/DevicePath.h>
+//
+// The Library classes this module consumes
+//
+#include <Library/UefiLib.h>
+#include <Library/UefiDriverEntryPoint.h>
+#include <Library/BaseLib.h>
+#include <Library/DxeServicesTableLib.h>
+#include <Library/UefiRuntimeLib.h>
+#include <Library/DebugLib.h>
+#include <Library/HobLib.h>
+#include <Library/BaseMemoryLib.h>
+#include <Library/MemoryAllocationLib.h>
+#include <Library/UefiBootServicesTableLib.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[] = {
+  //
+  // Systen 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),
+      }
+    },
+    {
+      0,
+      0
+    }
+  }
+};
+
+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;
+}
-- 
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