1 /*++ 2 3 Caution: This file is used for Duet platform only, do not use them in real platform. 4 All variable code, variable metadata, and variable data used by Duet platform are on 5 disk. They can be changed by user. BIOS is not able to protoect those. 6 Duet trusts all meta data from disk. If variable code, variable metadata and variable 7 data is modified in inproper way, the behavior is undefined. 8 9 Copyright (c) 2006 - 2014, Intel Corporation. All rights reserved.<BR> 10 This program and the accompanying materials 11 are licensed and made available under the terms and conditions of the BSD License 12 which accompanies this distribution. The full text of the license may be found at 13 http://opensource.org/licenses/bsd-license.php 14 15 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 16 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 17 18 Module Name: 19 20 MemStorage.c 21 22 Abstract: 23 24 handles variable store/reads with emulated memory 25 26 Revision History 27 28 --*/ 29 #include "FSVariable.h" 30 31 VOID 32 EFIAPI 33 OnVirtualAddressChangeMs ( 34 IN EFI_EVENT Event, 35 IN VOID *Context 36 ); 37 38 EFI_STATUS 39 EFIAPI 40 MemEraseStore( 41 IN VARIABLE_STORAGE *This 42 ); 43 44 EFI_STATUS 45 EFIAPI 46 MemWriteStore ( 47 IN VARIABLE_STORAGE *This, 48 IN UINTN Offset, 49 IN UINTN BufferSize, 50 IN VOID *Buffer 51 ); 52 53 EFI_STATUS 54 MemStorageConstructor ( 55 OUT VARIABLE_STORAGE **VarStore, 56 OUT EFI_EVENT_NOTIFY *GoVirtualEvent, 57 IN UINTN Size 58 ) 59 { 60 EFI_STATUS Status; 61 VS_DEV *Dev; 62 63 Status = gBS->AllocatePool (EfiRuntimeServicesData, sizeof(VS_DEV), (VOID **) &Dev); 64 ASSERT_EFI_ERROR (Status); 65 66 ZeroMem (Dev, sizeof(VS_DEV)); 67 68 Dev->Signature = VS_DEV_SIGNATURE; 69 Dev->Size = Size; 70 71 Dev->VarStore.Erase = MemEraseStore; 72 Dev->VarStore.Write = MemWriteStore; 73 74 Status = gBS->AllocatePool (EfiRuntimeServicesData, Size, (VOID **) &VAR_DATA_PTR (Dev)); 75 ASSERT_EFI_ERROR (Status); 76 77 DEBUG ((EFI_D_ERROR, "VStorage: Size = 0x%x\n", Size)); 78 79 *VarStore = &Dev->VarStore; 80 *GoVirtualEvent = OnVirtualAddressChangeMs; 81 82 return EFI_SUCCESS; 83 } 84 85 VOID 86 EFIAPI 87 OnVirtualAddressChangeMs ( 88 IN EFI_EVENT Event, 89 IN VOID *Context 90 ) 91 { 92 VS_DEV *Dev; 93 94 Dev = DEV_FROM_THIS (Context); 95 96 EfiConvertPointer (0, (VOID **)&VAR_DATA_PTR (Dev)); 97 EfiConvertPointer (0, (VOID **)&Dev->VarStore.Erase); 98 EfiConvertPointer (0, (VOID **)&Dev->VarStore.Write); 99 } 100 101 EFI_STATUS 102 EFIAPI 103 MemEraseStore( 104 IN VARIABLE_STORAGE *This 105 ) 106 { 107 VS_DEV *Dev; 108 109 Dev = DEV_FROM_THIS(This); 110 SetMem (VAR_DATA_PTR (Dev), Dev->Size, VAR_DEFAULT_VALUE); 111 return EFI_SUCCESS; 112 } 113 114 115 EFI_STATUS 116 EFIAPI 117 MemWriteStore ( 118 IN VARIABLE_STORAGE *This, 119 IN UINTN Offset, 120 IN UINTN BufferSize, 121 IN VOID *UserBuffer 122 ) 123 { 124 VS_DEV *Dev; 125 126 Dev = DEV_FROM_THIS(This); 127 128 ASSERT (Offset + BufferSize < Dev->Size); 129 130 // For better performance 131 if (VAR_DATA_PTR (Dev) + Offset != UserBuffer) { 132 CopyMem (VAR_DATA_PTR (Dev) + Offset, UserBuffer, BufferSize); 133 } 134 return EFI_SUCCESS; 135 } 136
