1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
|
/** @file
The internal header file includes the common header files, defines
internal structure and functions used by EmuVariable module.
Copyright (c) 2006 - 2008, 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.
**/
#ifndef _VARIABLE_H_
#define _VARIABLE_H_
#include <Uefi.h>
#include <Protocol/VariableWrite.h>
#include <Protocol/Variable.h>
#include <Library/BaseMemoryLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/DebugLib.h>
#include <Library/UefiRuntimeLib.h>
#include <Library/UefiDriverEntryPoint.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/UefiLib.h>
#include <Library/BaseLib.h>
#include <Library/PcdLib.h>
#include <VariableFormat.h>
#include <Guid/EventGroup.h>
#define GET_VARIABLE_NAME_PTR(a) (CHAR16 *) ((UINTN) (a) + sizeof (VARIABLE_HEADER))
typedef enum {
Physical,
Virtual
} VARIABLE_POINTER_TYPE;
typedef struct {
VARIABLE_HEADER *CurrPtr;
VARIABLE_HEADER *EndPtr;
VARIABLE_HEADER *StartPtr;
BOOLEAN Volatile;
} VARIABLE_POINTER_TRACK;
typedef struct {
EFI_PHYSICAL_ADDRESS VolatileVariableBase;
EFI_PHYSICAL_ADDRESS NonVolatileVariableBase;
EFI_LOCK VariableServicesLock;
} VARIABLE_GLOBAL;
typedef struct {
VARIABLE_GLOBAL VariableGlobal[2];
UINTN VolatileLastVariableOffset;
UINTN NonVolatileLastVariableOffset;
UINT32 FvbInstance;
} ESAL_VARIABLE_GLOBAL;
///
/// Don't use module globals after the SetVirtualAddress map is signaled
///
extern ESAL_VARIABLE_GLOBAL *mVariableModuleGlobal;
/**
Initializes variable store area for non-volatile and volatile variable.
This function allocates and initializes memory space for global context of ESAL
variable service and variable store area for non-volatile and volatile variable.
@param ImageHandle The Image handle of this driver.
@param SystemTable The pointer of EFI_SYSTEM_TABLE.
@retval EFI_SUCCESS Function successfully executed.
@retval EFI_OUT_OF_RESOURCES Fail to allocate enough memory resource.
**/
EFI_STATUS
EFIAPI
VariableCommonInitialize (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
);
/**
Entry point of EmuVariable service module.
This function is the entry point of EmuVariable service module.
It registers all interfaces of Variable Services, initializes
variable store for non-volatile and volatile variables, and registers
notification function for EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE event.
@param ImageHandle The Image handle of this driver.
@param SystemTable The pointer of EFI_SYSTEM_TABLE.
@retval EFI_SUCCESS Variable service successfully initialized.
**/
EFI_STATUS
EFIAPI
VariableServiceInitialize (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
);
/**
Notification function of EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE.
This is a notification function registered on EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE event.
It convers pointer to new virtual address.
@param Event Event whose notification function is being invoked.
@param Context Pointer to the notification function's context.
**/
VOID
EFIAPI
VariableClassAddressChangeEvent (
IN EFI_EVENT Event,
IN VOID *Context
);
/**
This code finds variable in storage blocks (Volatile or Non-Volatile).
@param VariableName A Null-terminated Unicode string that is the name of
the vendor's variable.
@param VendorGuid A unique identifier for the vendor.
@param Attributes If not NULL, a pointer to the memory location to return the
attributes bitmask for the variable.
@param DataSize Size of Data found. If size is less than the
data, this value contains the required size.
@param Data On input, the size in bytes of the return Data buffer.
On output, the size of data returned in Data.
@param Global Pointer to VARIABLE_GLOBAL structure
@param Instance Instance of the Firmware Volume.
@retval EFI_SUCCESS The function completed successfully.
@retval EFI_NOT_FOUND The variable was not found.
@retval EFI_BUFFER_TOO_SMALL DataSize is too small for the result. DataSize has
been updated with the size needed to complete the request.
@retval EFI_INVALID_PARAMETER VariableName or VendorGuid or DataSize is NULL.
**/
EFI_STATUS
EFIAPI
GetVariable (
IN CHAR16 *VariableName,
IN EFI_GUID * VendorGuid,
OUT UINT32 *Attributes OPTIONAL,
IN OUT UINTN *DataSize,
OUT VOID *Data,
IN VARIABLE_GLOBAL * Global,
IN UINT32 Instance
);
/**
This code finds the next available variable.
@param VariableNameSize Size of the variable.
@param VariableName On input, supplies the last VariableName that was returned by GetNextVariableName().
On output, returns the Null-terminated Unicode string of the current variable.
@param VendorGuid On input, supplies the last VendorGuid that was returned by GetNextVariableName().
On output, returns the VendorGuid of the current variable.
@param Global Pointer to VARIABLE_GLOBAL structure.
@param Instance Instance of the Firmware Volume.
@retval EFI_SUCCESS The function completed successfully.
@retval EFI_NOT_FOUND The next variable was not found.
@retval EFI_BUFFER_TOO_SMALL VariableNameSize is too small for the result.
VariableNameSize has been updated with the size needed to complete the request.
@retval EFI_INVALID_PARAMETER VariableNameSize or VariableName or VendorGuid is NULL.
**/
EFI_STATUS
EFIAPI
GetNextVariableName (
IN OUT UINTN *VariableNameSize,
IN OUT CHAR16 *VariableName,
IN OUT EFI_GUID *VendorGuid,
IN VARIABLE_GLOBAL *Global,
IN UINT32 Instance
);
/**
This code sets variable in storage blocks (Volatile or Non-Volatile).
@param VariableName A Null-terminated Unicode string that is the name of the vendor's
variable. Each VariableName is unique for each
VendorGuid. VariableName must contain 1 or more
Unicode characters. If VariableName is an empty Unicode
string, then EFI_INVALID_PARAMETER is returned.
@param VendorGuid A unique identifier for the vendor
@param Attributes Attributes bitmask to set for the variable
@param DataSize The size in bytes of the Data buffer. A size of zero causes the
variable to be deleted.
@param Data The contents for the variable
@param Global Pointer to VARIABLE_GLOBAL structure
@param VolatileOffset The offset of last volatile variable
@param NonVolatileOffset The offset of last non-volatile variable
@param Instance Instance of the Firmware Volume.
@retval EFI_SUCCESS The firmware has successfully stored the variable and its data as
defined by the Attributes.
@retval EFI_INVALID_PARAMETER An invalid combination of attribute bits was supplied, or the
DataSize exceeds the maximum allowed, or VariableName is an empty
Unicode string, or VendorGuid is NULL.
@retval EFI_OUT_OF_RESOURCES Not enough storage is available to hold the variable and its data.
@retval EFI_DEVICE_ERROR The variable could not be saved due to a hardware failure.
@retval EFI_WRITE_PROTECTED The variable in question is read-only or cannot be deleted.
@retval EFI_NOT_FOUND The variable trying to be updated or deleted was not found.
**/
EFI_STATUS
EFIAPI
SetVariable (
IN CHAR16 *VariableName,
IN EFI_GUID *VendorGuid,
IN UINT32 Attributes,
IN UINTN DataSize,
IN VOID *Data,
IN VARIABLE_GLOBAL *Global,
IN UINTN *VolatileOffset,
IN UINTN *NonVolatileOffset,
IN UINT32 Instance
);
/**
This code returns information about the EFI variables.
@param Attributes Attributes bitmask to specify the type of variables
on which to return information.
@param MaximumVariableStorageSize On output the maximum size of the storage space available for
the EFI variables associated with the attributes specified.
@param RemainingVariableStorageSize Returns the remaining size of the storage space available for EFI
variables associated with the attributes specified.
@param MaximumVariableSize Returns the maximum size of an individual EFI variable
associated with the attributes specified.
@param Global Pointer to VARIABLE_GLOBAL structure.
@param Instance Instance of the Firmware Volume.
@retval EFI_SUCCESS Valid answer returned.
@retval EFI_INVALID_PARAMETER An invalid combination of attribute bits was supplied
@retval EFI_UNSUPPORTED The attribute is not supported on this platform, and the
MaximumVariableStorageSize, RemainingVariableStorageSize,
MaximumVariableSize are undefined.
**/
EFI_STATUS
EFIAPI
QueryVariableInfo (
IN UINT32 Attributes,
OUT UINT64 *MaximumVariableStorageSize,
OUT UINT64 *RemainingVariableStorageSize,
OUT UINT64 *MaximumVariableSize,
IN VARIABLE_GLOBAL *Global,
IN UINT32 Instance
);
#endif
|
