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741a1e5895
Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Eric Dong <eric.dong@intel.com> Reviewed-by: Ruiyu Ni <ruiyu.ni@intel.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16217 6f19259b-4bc3-4df7-8a09-765794883524
136 lines
3.3 KiB
C
136 lines
3.3 KiB
C
/*++
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Caution: This file is used for Duet platform only, do not use them in real platform.
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All variable code, variable metadata, and variable data used by Duet platform are on
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disk. They can be changed by user. BIOS is not able to protoect those.
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Duet trusts all meta data from disk. If variable code, variable metadata and variable
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data is modified in inproper way, the behavior is undefined.
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Copyright (c) 2006 - 2014, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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Module Name:
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MemStorage.c
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Abstract:
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handles variable store/reads with emulated memory
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Revision History
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--*/
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#include "FSVariable.h"
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VOID
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EFIAPI
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OnVirtualAddressChangeMs (
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IN EFI_EVENT Event,
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IN VOID *Context
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);
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EFI_STATUS
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EFIAPI
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MemEraseStore(
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IN VARIABLE_STORAGE *This
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);
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EFI_STATUS
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EFIAPI
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MemWriteStore (
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IN VARIABLE_STORAGE *This,
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IN UINTN Offset,
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IN UINTN BufferSize,
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IN VOID *Buffer
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);
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EFI_STATUS
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MemStorageConstructor (
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OUT VARIABLE_STORAGE **VarStore,
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OUT EFI_EVENT_NOTIFY *GoVirtualEvent,
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IN UINTN Size
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)
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{
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EFI_STATUS Status;
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VS_DEV *Dev;
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Status = gBS->AllocatePool (EfiRuntimeServicesData, sizeof(VS_DEV), (VOID **) &Dev);
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ASSERT_EFI_ERROR (Status);
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ZeroMem (Dev, sizeof(VS_DEV));
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Dev->Signature = VS_DEV_SIGNATURE;
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Dev->Size = Size;
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Dev->VarStore.Erase = MemEraseStore;
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Dev->VarStore.Write = MemWriteStore;
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Status = gBS->AllocatePool (EfiRuntimeServicesData, Size, (VOID **) &VAR_DATA_PTR (Dev));
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ASSERT_EFI_ERROR (Status);
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DEBUG ((EFI_D_ERROR, "VStorage: Size = 0x%x\n", Size));
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*VarStore = &Dev->VarStore;
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*GoVirtualEvent = OnVirtualAddressChangeMs;
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return EFI_SUCCESS;
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}
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VOID
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EFIAPI
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OnVirtualAddressChangeMs (
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IN EFI_EVENT Event,
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IN VOID *Context
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)
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{
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VS_DEV *Dev;
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Dev = DEV_FROM_THIS (Context);
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EfiConvertPointer (0, (VOID **)&VAR_DATA_PTR (Dev));
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EfiConvertPointer (0, (VOID **)&Dev->VarStore.Erase);
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EfiConvertPointer (0, (VOID **)&Dev->VarStore.Write);
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}
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EFI_STATUS
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EFIAPI
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MemEraseStore(
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IN VARIABLE_STORAGE *This
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)
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{
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VS_DEV *Dev;
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Dev = DEV_FROM_THIS(This);
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SetMem (VAR_DATA_PTR (Dev), Dev->Size, VAR_DEFAULT_VALUE);
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return EFI_SUCCESS;
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}
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EFI_STATUS
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EFIAPI
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MemWriteStore (
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IN VARIABLE_STORAGE *This,
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IN UINTN Offset,
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IN UINTN BufferSize,
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IN VOID *UserBuffer
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)
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{
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VS_DEV *Dev;
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Dev = DEV_FROM_THIS(This);
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ASSERT (Offset + BufferSize < Dev->Size);
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// For better performance
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if (VAR_DATA_PTR (Dev) + Offset != UserBuffer) {
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CopyMem (VAR_DATA_PTR (Dev) + Offset, UserBuffer, BufferSize);
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}
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return EFI_SUCCESS;
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}
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