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/** @file
Implment all four UEFI runtime variable services and
install variable architeture protocol.
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.
**/
#include "Variable.h"
EFI_EVENT mVirtualAddressChangeEvent = NULL;
/**
This code finds variable in storage blocks (Volatile or Non-Volatile).
@param VariableName Name of Variable to be found.
@param VendorGuid Variable vendor GUID.
@param Attributes Attribute value of the variable found.
@param DataSize Size of Data found. If size is less than the
data, this value contains the required size.
@param Data Data pointer.
@return EFI_INVALID_PARAMETER Invalid parameter
@return EFI_SUCCESS Find the specified variable
@return EFI_NOT_FOUND Not found
@return EFI_BUFFER_TO_SMALL DataSize is too small for the result
**/
EFI_STATUS
EFIAPI
RuntimeServiceGetVariable (
IN CHAR16 *VariableName,
IN EFI_GUID *VendorGuid,
OUT UINT32 *Attributes OPTIONAL,
IN OUT UINTN *DataSize,
OUT VOID *Data
)
{
return GetVariable (
VariableName,
VendorGuid,
Attributes OPTIONAL,
DataSize,
Data,
&mVariableModuleGlobal->VariableGlobal[Physical],
mVariableModuleGlobal->FvbInstance
);
}
/**
This code Finds the Next available variable.
@param VariableNameSize Size of the variable name
@param VariableName Pointer to variable name
@param VendorGuid Variable Vendor Guid
@return EFI_INVALID_PARAMETER Invalid parameter
@return EFI_SUCCESS Find the specified variable
@return EFI_NOT_FOUND Not found
@return EFI_BUFFER_TO_SMALL DataSize is too small for the result
**/
EFI_STATUS
EFIAPI
RuntimeServiceGetNextVariableName (
IN OUT UINTN *VariableNameSize,
IN OUT CHAR16 *VariableName,
IN OUT EFI_GUID *VendorGuid
)
{
return GetNextVariableName (
VariableNameSize,
VariableName,
VendorGuid,
&mVariableModuleGlobal->VariableGlobal[Physical],
mVariableModuleGlobal->FvbInstance
);
}
/**
This code sets variable in storage blocks (Volatile or Non-Volatile).
@param VariableName Name of Variable to be found
@param VendorGuid Variable vendor GUID
@param Attributes Attribute value of the variable found
@param DataSize Size of Data found. If size is less than the
data, this value contains the required size.
@param Data Data pointer
@return EFI_INVALID_PARAMETER Invalid parameter
@return EFI_SUCCESS Set successfully
@return EFI_OUT_OF_RESOURCES Resource not enough to set variable
@return EFI_NOT_FOUND Not found
@return EFI_WRITE_PROTECTED Variable is read-only
**/
EFI_STATUS
EFIAPI
RuntimeServiceSetVariable (
IN CHAR16 *VariableName,
IN EFI_GUID *VendorGuid,
IN UINT32 Attributes,
IN UINTN DataSize,
IN VOID *Data
)
{
return SetVariable (
VariableName,
VendorGuid,
Attributes,
DataSize,
Data,
&mVariableModuleGlobal->VariableGlobal[Physical],
&mVariableModuleGlobal->VolatileLastVariableOffset,
&mVariableModuleGlobal->NonVolatileLastVariableOffset,
mVariableModuleGlobal->FvbInstance
);
}
/**
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 Pointer to the maximum size of the storage space available
for the EFI variables associated with the attributes specified.
@param RemainingVariableStorageSize Pointer to the remaining size of the storage space available
for EFI variables associated with the attributes specified.
@param MaximumVariableSize Pointer to the maximum size of an individual EFI variables
associated with the attributes specified.
@return EFI_INVALID_PARAMETER An invalid combination of attribute bits was supplied.
@return EFI_SUCCESS Query successfully.
@return EFI_UNSUPPORTED The attribute is not supported on this platform.
**/
EFI_STATUS
EFIAPI
RuntimeServiceQueryVariableInfo (
IN UINT32 Attributes,
OUT UINT64 *MaximumVariableStorageSize,
OUT UINT64 *RemainingVariableStorageSize,
OUT UINT64 *MaximumVariableSize
)
{
return QueryVariableInfo (
Attributes,
MaximumVariableStorageSize,
RemainingVariableStorageSize,
MaximumVariableSize,
&mVariableModuleGlobal->VariableGlobal[Physical],
mVariableModuleGlobal->FvbInstance
);
}
/**
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
)
{
EfiConvertPointer (
0x0,
(VOID **) &mVariableModuleGlobal->VariableGlobal[Physical].NonVolatileVariableBase
);
EfiConvertPointer (
0x0,
(VOID **) &mVariableModuleGlobal->VariableGlobal[Physical].VolatileVariableBase
);
EfiConvertPointer (0x0, (VOID **) &mVariableModuleGlobal);
}
/**
EmuVariable Driver main entry point. The Variable driver places the 4 EFI
runtime services in the EFI System Table and installs arch protocols
for variable read and write services being availible. It also registers
notification function for EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE event.
@param[in] ImageHandle The firmware allocated handle for the EFI image.
@param[in] SystemTable A pointer to the EFI System Table.
@retval EFI_SUCCESS Variable service successfully initialized.
**/
EFI_STATUS
EFIAPI
VariableServiceInitialize (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_HANDLE NewHandle;
EFI_STATUS Status;
Status = VariableCommonInitialize (ImageHandle, SystemTable);
ASSERT_EFI_ERROR (Status);
SystemTable->RuntimeServices->GetVariable = RuntimeServiceGetVariable;
SystemTable->RuntimeServices->GetNextVariableName = RuntimeServiceGetNextVariableName;
SystemTable->RuntimeServices->SetVariable = RuntimeServiceSetVariable;
SystemTable->RuntimeServices->QueryVariableInfo = RuntimeServiceQueryVariableInfo;
//
// Now install the Variable Runtime Architectural Protocol on a new handle
//
NewHandle = NULL;
Status = gBS->InstallMultipleProtocolInterfaces (
&NewHandle,
&gEfiVariableArchProtocolGuid,
NULL,
&gEfiVariableWriteArchProtocolGuid,
NULL,
NULL
);
ASSERT_EFI_ERROR (Status);
Status = gBS->CreateEvent (
EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE,
TPL_NOTIFY,
VariableClassAddressChangeEvent,
NULL,
&mVirtualAddressChangeEvent
);
ASSERT_EFI_ERROR (Status);
return EFI_SUCCESS;
}
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