From 9071550e8697ed9df3d24b369bd30e3f0e190d1f Mon Sep 17 00:00:00 2001
From: klu2 <klu2@6f19259b-4bc3-4df7-8a09-765794883524>
Date: Fri, 18 Apr 2008 03:09:54 +0000
Subject: Add missing module for duet package.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@5088 6f19259b-4bc3-4df7-8a09-765794883524
---
 DuetPkg/FSVariable/MemStorage.c | 135 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 135 insertions(+)
 create mode 100644 DuetPkg/FSVariable/MemStorage.c

(limited to 'DuetPkg/FSVariable/MemStorage.c')

diff --git a/DuetPkg/FSVariable/MemStorage.c b/DuetPkg/FSVariable/MemStorage.c
new file mode 100644
index 0000000000..ed72b898f0
--- /dev/null
+++ b/DuetPkg/FSVariable/MemStorage.c
@@ -0,0 +1,135 @@
+/*++
+
+Copyright (c) 2006 - 2007, Intel Corporation
+All rights reserved. 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:
+
+    MemStorage.c
+
+Abstract:
+
+    handles variable store/reads with emulated memory
+
+Revision History
+
+--*/
+#include "FSVariable.h"
+
+STATIC
+VOID
+EFIAPI
+OnVirtualAddressChange (
+  IN EFI_EVENT            Event,
+  IN VOID                 *Context
+  );
+
+STATIC
+EFI_STATUS
+EFIAPI
+MemEraseStore(
+  IN VARIABLE_STORAGE   *This
+  );
+
+STATIC
+EFI_STATUS
+EFIAPI
+MemWriteStore (
+  IN VARIABLE_STORAGE   *This,
+  IN UINTN                Offset,
+  IN UINTN                BufferSize,
+  IN VOID                 *Buffer
+  );
+
+EFI_STATUS
+MemStorageConstructor (
+  OUT VARIABLE_STORAGE          **VarStore,
+  OUT EFI_EVENT_NOTIFY          *GoVirtualEvent,
+  IN  UINTN                     Size
+  )
+{
+  EFI_STATUS                  Status;
+  VS_DEV                      *Dev;
+
+  Status = gBS->AllocatePool (EfiRuntimeServicesData, sizeof(VS_DEV), &Dev);
+  ASSERT_EFI_ERROR (Status);
+
+  ZeroMem (Dev, sizeof(VS_DEV));
+
+  Dev->Signature   = VARIABLE_STORE_SIGNATURE;
+  Dev->Size        = Size;
+
+  Dev->VarStore.Erase    = MemEraseStore;
+  Dev->VarStore.Write    = MemWriteStore;
+
+  Status = gBS->AllocatePool (EfiRuntimeServicesData, Size, &VAR_DATA_PTR (Dev));
+  ASSERT_EFI_ERROR (Status);
+
+  DEBUG ((EFI_D_ERROR, "VStorage: Size = 0x%x\n", Size));
+  
+  *VarStore       = &Dev->VarStore;
+  *GoVirtualEvent = OnVirtualAddressChange;
+
+  return EFI_SUCCESS;
+}
+
+STATIC
+VOID
+EFIAPI
+OnVirtualAddressChange (
+  IN EFI_EVENT            Event,
+  IN VOID                 *Context
+  )
+{
+  VS_DEV                  *Dev;
+
+  Dev = DEV_FROM_THIS (Context);
+
+  EfiConvertPointer (0, &VAR_DATA_PTR (Dev));
+  EfiConvertPointer (0, (VOID**)&Dev->VarStore.Erase);
+  EfiConvertPointer (0, (VOID**)&Dev->VarStore.Write);
+}
+
+STATIC
+EFI_STATUS
+EFIAPI
+MemEraseStore(
+  IN VARIABLE_STORAGE   *This
+  )
+{
+  VS_DEV              *Dev;
+
+  Dev = DEV_FROM_THIS(This);
+  SetMem (VAR_DATA_PTR (Dev), Dev->Size, VAR_DEFAULT_VALUE);
+  return EFI_SUCCESS;
+}
+
+
+STATIC
+EFI_STATUS
+EFIAPI
+MemWriteStore (
+  IN VARIABLE_STORAGE     *This,
+  IN UINTN                Offset,
+  IN UINTN                BufferSize,
+  IN VOID                 *UserBuffer
+  )
+{
+  VS_DEV              *Dev;
+
+  Dev = DEV_FROM_THIS(This);
+
+  ASSERT (Offset + BufferSize < Dev->Size);
+
+  // For better performance
+  if (VAR_DATA_PTR (Dev) + Offset != UserBuffer) {
+    CopyMem (VAR_DATA_PTR (Dev) + Offset, UserBuffer, BufferSize);
+  }
+  return EFI_SUCCESS;
+}
-- 
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