UefiRuntimeLib.h File Reference

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Functions
BOOLEAN EFIAPI	EfiAtRuntime (VOID)
BOOLEAN EFIAPI	EfiGoneVirtual (VOID)
EFI_STATUS EFIAPI	EfiGetTime (OUT EFI_TIME *Time, OUT EFI_TIME_CAPABILITIES *Capabilities OPTIONAL)
EFI_STATUS EFIAPI	EfiSetTime (IN EFI_TIME *Time)
EFI_STATUS EFIAPI	EfiGetWakeupTime (OUT BOOLEAN *Enabled, OUT BOOLEAN *Pending, OUT EFI_TIME *Time)
EFI_STATUS EFIAPI	EfiSetWakeupTime (IN BOOLEAN Enable, IN EFI_TIME *Time OPTIONAL)
EFI_STATUS EFIAPI	EfiGetVariable (IN CHAR16 *VariableName, IN EFI_GUID *VendorGuid, OUT UINT32 *Attributes OPTIONAL, IN OUT UINTN *DataSize, OUT VOID *Data)
EFI_STATUS EFIAPI	EfiGetNextVariableName (IN OUT UINTN *VariableNameSize, IN OUT CHAR16 *VariableName, IN OUT EFI_GUID *VendorGuid)
EFI_STATUS EFIAPI	EfiSetVariable (IN CHAR16 *VariableName, IN EFI_GUID *VendorGuid, IN UINT32 Attributes, IN UINTN DataSize, IN VOID *Data)
EFI_STATUS EFIAPI	EfiGetNextHighMonotonicCount (OUT UINT32 *HighCount)
VOID EFIAPI	EfiResetSystem (IN EFI_RESET_TYPE ResetType, IN EFI_STATUS ResetStatus, IN UINTN DataSize, IN VOID *ResetData OPTIONAL)
EFI_STATUS EFIAPI	EfiConvertPointer (IN UINTN DebugDisposition, IN OUT VOID **Address)
EFI_STATUS EFIAPI	EfiConvertFunctionPointer (IN UINTN DebugDisposition, IN OUT VOID **Address)
EFI_STATUS EFIAPI	EfiSetVirtualAddressMap (IN UINTN MemoryMapSize, IN UINTN DescriptorSize, IN UINT32 DescriptorVersion, IN CONST EFI_MEMORY_DESCRIPTOR *VirtualMap)
EFI_STATUS EFIAPI	EfiConvertList (IN UINTN DebugDisposition, IN OUT LIST_ENTRY *ListHead)
EFI_STATUS EFIAPI	EfiUpdateCapsule (IN EFI_CAPSULE_HEADER **CapsuleHeaderArray, IN UINTN CapsuleCount, IN EFI_PHYSICAL_ADDRESS ScatterGatherList OPTIONAL)
EFI_STATUS EFIAPI	EfiQueryCapsuleCapabilities (IN EFI_CAPSULE_HEADER **CapsuleHeaderArray, IN UINTN CapsuleCount, OUT UINT64 *MaximumCapsuleSize, OUT EFI_RESET_TYPE *ResetType)
EFI_STATUS EFIAPI	EfiQueryVariableInfo (IN UINT32 Attributes, OUT UINT64 *MaximumVariableStorageSize, OUT UINT64 *RemainingVariableStorageSize, OUT UINT64 *MaximumVariableSize)

Detailed Description

Provides library functions for each of the UEFI Runtime Services. Only available to DXE and UEFI module types.

Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.
SPDX-License-Identifier: BSD-2-Clause-Patent

Definition in file UefiRuntimeLib.h.

Function Documentation

EfiAtRuntime()

BOOLEAN EFIAPI EfiAtRuntime

(

VOID

)

This function allows the caller to determine if UEFI ExitBootServices() has been called.

This function returns TRUE after all the EVT_SIGNAL_EXIT_BOOT_SERVICES functions have executed as a result of the OS calling ExitBootServices(). Prior to this time FALSE is returned. This function is used by runtime code to decide it is legal to access services that go away after ExitBootServices().

Return values

TRUE	The system has finished executing the EVT_SIGNAL_EXIT_BOOT_SERVICES event.
FALSE	The system has not finished executing the EVT_SIGNAL_EXIT_BOOT_SERVICES event.

Definition at line 167 of file RuntimeLib.c.

EfiConvertFunctionPointer()

EFI_STATUS EFIAPI EfiConvertFunctionPointer	(	IN UINTN	DebugDisposition,
		IN OUT VOID **	Address
	)

Determines the new virtual address that is to be used on subsequent memory accesses.

For IA32, x64, and EBC, this service is a wrapper for the UEFI Runtime Service ConvertPointer(). See the UEFI Specification for details. For IPF, this function interprets Address as a pointer to an EFI_PLABEL structure and both the EntryPoint and GP fields of an EFI_PLABEL are converted from physical to virtiual addressing. Since IPF allows the GP to point to an address outside a PE/COFF image, the physical to virtual offset for the EntryPoint field is used to adjust the GP field. The UEFI Runtime Service ConvertPointer() is used to convert EntryPoint and the status code for this conversion is always returned. If the convertion of EntryPoint fails, then neither EntryPoint nor GP are modified. See the UEFI Specification for details on the UEFI Runtime Service ConvertPointer().

Parameters

DebugDisposition	Supplies type information for the pointer being converted.
Address	The pointer to a pointer that is to be fixed to be the value needed for the new virtual address mapping being applied.

Returns

EFI_STATUS value from EfiConvertPointer().

Definition at line 593 of file RuntimeLib.c.

EfiConvertList()

EFI_STATUS EFIAPI EfiConvertList	(	IN UINTN	DebugDisposition,
		IN OUT LIST_ENTRY *	ListHead
	)

Convert the standard Lib double linked list to a virtual mapping.

This service uses EfiConvertPointer() to walk a double linked list and convert all the link pointers to their virtual mappings. This function is only guaranteed to work during the EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE event and calling it at other times has undefined results.

Parameters

DebugDisposition	Supplies type information for the pointer being converted.
ListHead	Head of linked list to convert.

Return values

EFI_SUCCESS	Successfully executed the function.
!EFI_SUCCESS	Failed to execute the function.

Convert the standard Lib double linked list to a virtual mapping.

This service uses EfiConvertPointer() to walk a double linked list and convert all the link pointers to their virtual mappings. This function is only guaranteed to work during the EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE event and calling it at other times has undefined results.

Parameters

DebugDisposition	Supplies type information for the pointer being converted.
ListHead	Head of linked list to convert.

Return values

EFI_SUCCESS	Success to execute the function.
!EFI_SUCCESS	Failed to e3xecute the function.

Definition at line 617 of file RuntimeLib.c.

EfiConvertPointer()

EFI_STATUS EFIAPI EfiConvertPointer	(	IN UINTN	DebugDisposition,
		IN OUT VOID **	Address
	)

This service is a wrapper for the UEFI Runtime Service ConvertPointer().

The ConvertPointer() function is used by an EFI component during the SetVirtualAddressMap() operation. ConvertPointer()must be called using physical address pointers during the execution of SetVirtualAddressMap().

Parameters

DebugDisposition	Supplies type information for the pointer being converted.
Address	The pointer to a pointer that is to be fixed to be the value needed for the new virtual address mapping being applied.

Return values

EFI_SUCCESS	The pointer pointed to by Address was modified.
EFI_NOT_FOUND	The pointer pointed to by Address was not found to be part of the current memory map. This is normally fatal.
EFI_INVALID_PARAMETER	Address is NULL.
EFI_INVALID_PARAMETER	*Address is NULL and DebugDisposition does not have the EFI_OPTIONAL_PTR bit set.
EFI_UNSUPPORTED	This call is not supported by this platform at the time the call is made. The platform should describe this runtime service as unsupported at runtime via an EFI_RT_PROPERTIES_TABLE configuration table.

Definition at line 561 of file RuntimeLib.c.

EfiGetNextHighMonotonicCount()

EFI_STATUS EFIAPI EfiGetNextHighMonotonicCount

(

OUT UINT32 *

HighCount

)

This service is a wrapper for the UEFI Runtime Service GetNextHighMonotonicCount().

The platform's monotonic counter is comprised of two 32-bit quantities: the high 32 bits and the low 32 bits. During boot service time the low 32-bit value is volatile: it is reset to zero on every system reset and is increased by 1 on every call to GetNextMonotonicCount(). The high 32-bit value is nonvolatile and is increased by 1 whenever the system resets or whenever the low 32-bit count (returned by GetNextMonoticCount()) overflows.

Parameters

HighCount

Pointer to returned value.

Return values

EFI_SUCCESS	The next high monotonic count was returned.
EFI_DEVICE_ERROR	The device is not functioning properly.
EFI_INVALID_PARAMETER	HighCount is NULL.
EFI_UNSUPPORTED	This call is not supported by this platform at the time the call is made. The platform should describe this runtime service as unsupported at runtime via an EFI_RT_PROPERTIES_TABLE configuration table.

This service is a wrapper for the UEFI Runtime Service GetNextHighMonotonicCount().

The platform's monotonic counter is comprised of two 32-bit quantities: the high 32 bits and the low 32 bits. During boot service time the low 32-bit value is volatile: it is reset to zero on every system reset and is increased by 1 on every call to GetNextMonotonicCount(). The high 32-bit value is nonvolatile and is increased by 1 whenever the system resets or whenever the low 32-bit count (returned by GetNextMonoticCount()) overflows.

Parameters

HighCount

The pointer to returned value.

Return values

EFI_SUCCESS	The next high monotonic count was returned.
EFI_DEVICE_ERROR	The device is not functioning properly.
EFI_INVALID_PARAMETER	HighCount is NULL.
EFI_UNSUPPORTED	This call is not supported by this platform at the time the call is made. The platform should describe this runtime service as unsupported at runtime via an EFI_RT_PROPERTIES_TABLE configuration table.

Definition at line 530 of file RuntimeLib.c.

EfiGetNextVariableName()

EFI_STATUS EFIAPI EfiGetNextVariableName	(	IN OUT UINTN *	VariableNameSize,
		IN OUT CHAR16 *	VariableName,
		IN OUT EFI_GUID *	VendorGuid
	)

This service is a wrapper for the UEFI Runtime Service GetNextVariableName().

GetNextVariableName() is called multiple times to retrieve the VariableName and VendorGuid of all variables currently available in the system. On each call to GetNextVariableName() the previous results are passed into the interface, and on output the interface returns the next variable name data. When the entire variable list has been returned, the error EFI_NOT_FOUND is returned.

Parameters

VariableNameSize	As input, point to maximum size of variable name. As output, point to actual size of variable name.
VariableName	As input, supplies the last VariableName that was returned by GetNextVariableName(). As output, returns the name of variable. The name string is Null-Terminated Unicode string.
VendorGuid	As input, supplies the last VendorGuid that was returned by GetNextVriableName(). As output, returns the VendorGuid of the current variable.

Return values

EFI_SUCCESS	The function completed successfully.
EFI_NOT_FOUND	The next variable was not found.
EFI_BUFFER_TOO_SMALL	The VariableNameSize is too small for the result. VariableNameSize has been updated with the size needed to complete the request.
EFI_INVALID_PARAMETER	VariableNameSize is NULL.
EFI_INVALID_PARAMETER	VariableName is NULL.
EFI_INVALID_PARAMETER	VendorGuid is NULL.
EFI_DEVICE_ERROR	The variable name could not be retrieved due to a hardware error.
EFI_UNSUPPORTED	After ExitBootServices() has been called, this return code may be returned if no variable storage is supported. The platform should describe this runtime service as unsupported at runtime via an EFI_RT_PROPERTIES_TABLE configuration table.

Definition at line 455 of file RuntimeLib.c.

EfiGetTime()

EFI_STATUS EFIAPI EfiGetTime	(	OUT EFI_TIME *	Time,
		OUT EFI_TIME_CAPABILITIES *Capabilities	OPTIONAL
	)

This service is a wrapper for the UEFI Runtime Service GetTime().

The GetTime() function returns a time that was valid sometime during the call to the function. While the returned EFI_TIME structure contains TimeZone and Daylight savings time information, the actual clock does not maintain these values. The current time zone and daylight saving time information returned by GetTime() are the values that were last set via SetTime(). The GetTime() function should take approximately the same amount of time to read the time each time it is called. All reported device capabilities are to be rounded up. During runtime, if a PC-AT CMOS device is present in the platform, the caller must synchronize access to the device before calling GetTime().

Parameters

Time	A pointer to storage to receive a snapshot of the current time.
Capabilities	An optional pointer to a buffer to receive the real time clock device's capabilities.

Return values

EFI_SUCCESS	The operation completed successfully.
EFI_INVALID_PARAMETER	Time is NULL.
EFI_DEVICE_ERROR	The time could not be retrieved due to a hardware error.
EFI_UNSUPPORTED	This call is not supported by this platform at the time the call is made. The platform should describe this runtime service as unsupported at runtime via an EFI_RT_PROPERTIES_TABLE configuration table.

This service is a wrapper for the UEFI Runtime Service GetTime().

The GetTime() function returns a time that was valid sometime during the call to the function. While the returned EFI_TIME structure contains TimeZone and Daylight savings time information, the actual clock does not maintain these values. The current time zone and daylight saving time information returned by GetTime() are the values that were last set via SetTime(). The GetTime() function should take approximately the same amount of time to read the time each time it is called. All reported device capabilities are to be rounded up. During runtime, if a PC-AT CMOS device is present in the platform the caller must synchronize access to the device before calling GetTime().

Parameters

Time	A pointer to storage to receive a snapshot of the current time.
Capabilities	An optional pointer to a buffer to receive the real time clock device's capabilities.

Return values

EFI_SUCCESS	The operation completed successfully.
EFI_INVALID_PARAMETER	Time is NULL.
EFI_DEVICE_ERROR	The time could not be retrieved due to a hardware error.
EFI_UNSUPPORTED	This call is not supported by this platform at the time the call is made. The platform should describe this runtime service as unsupported at runtime via an EFI_RT_PROPERTIES_TABLE configuration table.

Definition at line 262 of file RuntimeLib.c.

EfiGetVariable()

EFI_STATUS EFIAPI EfiGetVariable	(	IN CHAR16 *	VariableName,
		IN EFI_GUID *	VendorGuid,
		OUT UINT32 *Attributes	OPTIONAL,
		IN OUT UINTN *	DataSize,
		OUT VOID *	Data
	)

This service is a wrapper for the UEFI Runtime Service GetVariable().

Each vendor may create and manage its own variables without the risk of name conflicts by using a unique VendorGuid. When a variable is set, its Attributes are supplied to indicate how the data variable should be stored and maintained by the system. The attributes affect when the variable may be accessed and volatility of the data. Any attempts to access a variable that does not have the attribute set for runtime access will yield the EFI_NOT_FOUND error. If the Data buffer is too small to hold the contents of the variable, the error EFI_BUFFER_TOO_SMALL is returned and DataSize is set to the required buffer size to obtain the data.

Parameters

VariableName	the name of the vendor's variable, it's a Null-Terminated Unicode String
VendorGuid	Unify identifier for vendor.
Attributes	Point to memory location to return the attributes of variable. If the point is NULL, the parameter would be ignored.
DataSize	As input, point to the maximum size of return Data-Buffer. As output, point to the actual size of the returned Data-Buffer.
Data	Point to return Data-Buffer.

Return values

EFI_SUCCESS	The function completed successfully.
EFI_NOT_FOUND	The variable was not found.
EFI_BUFFER_TOO_SMALL	The DataSize is too small for the result. DataSize has been updated with the size needed to complete the request.
EFI_INVALID_PARAMETER	VariableName is NULL.
EFI_INVALID_PARAMETER	VendorGuid is NULL.
EFI_INVALID_PARAMETER	DataSize is NULL.
EFI_INVALID_PARAMETER	The DataSize is not too small and Data is NULL.
EFI_DEVICE_ERROR	The variable could not be retrieved due to a hardware error.
EFI_SECURITY_VIOLATION	The variable could not be retrieved due to an authentication failure.
EFI_UNSUPPORTED	After ExitBootServices() has been called, this return code may be returned if no variable storage is supported. The platform should describe this runtime service as unsupported at runtime via an EFI_RT_PROPERTIES_TABLE configuration table.

This service is a wrapper for the UEFI Runtime Service GetVariable().

Each vendor may create and manage its own variables without the risk of name conflicts by using a unique VendorGuid. When a variable is set its Attributes are supplied to indicate how the data variable should be stored and maintained by the system. The attributes affect when the variable may be accessed and volatility of the data. Any attempts to access a variable that does not have the attribute set for runtime access will yield the EFI_NOT_FOUND error. If the Data buffer is too small to hold the contents of the variable, the error EFI_BUFFER_TOO_SMALL is returned and DataSize is set to the required buffer size to obtain the data.

Parameters

VariableName	the name of the vendor's variable, it's a Null-Terminated Unicode String
VendorGuid	Unify identifier for vendor.
Attributes	Point to memory location to return the attributes of variable. If the point is NULL, the parameter would be ignored.
DataSize	As input, point to the maximum size of return Data-Buffer. As output, point to the actual size of the returned Data-Buffer.
Data	Point to return Data-Buffer.

Return values

EFI_SUCCESS	The function completed successfully.
EFI_NOT_FOUND	The variable was not found.
EFI_BUFFER_TOO_SMALL	The DataSize is too small for the result. DataSize has been updated with the size needed to complete the request.
EFI_INVALID_PARAMETER	VariableName is NULL.
EFI_INVALID_PARAMETER	VendorGuid is NULL.
EFI_INVALID_PARAMETER	DataSize is NULL.
EFI_INVALID_PARAMETER	The DataSize is not too small and Data is NULL.
EFI_DEVICE_ERROR	The variable could not be retrieved due to a hardware error.
EFI_SECURITY_VIOLATION	The variable could not be retrieved due to an authentication failure.
EFI_UNSUPPORTED	After ExitBootServices() has been called, this return code may be returned if no variable storage is supported. The platform should describe this runtime service as unsupported at runtime via an EFI_RT_PROPERTIES_TABLE configuration table.

Definition at line 408 of file RuntimeLib.c.

EfiGetWakeupTime()

EFI_STATUS EFIAPI EfiGetWakeupTime	(	OUT BOOLEAN *	Enabled,
		OUT BOOLEAN *	Pending,
		OUT EFI_TIME *	Time
	)

This service is a wrapper for the UEFI Runtime Service GetWakeupTime().

The alarm clock time may be rounded from the set alarm clock time to be within the resolution of the alarm clock device. The resolution of the alarm clock device is defined to be one second. During runtime, if a PC-AT CMOS device is present in the platform the caller must synchronize access to the device before calling GetWakeupTime().

Parameters

Enabled	Indicates if the alarm is currently enabled or disabled.
Pending	Indicates if the alarm signal is pending and requires acknowledgement.
Time	The current alarm setting. Type EFI_TIME is defined in the GetTime() function description.

Return values

EFI_SUCCESS	The alarm settings were returned.
EFI_INVALID_PARAMETER	Enabled is NULL.
EFI_INVALID_PARAMETER	Pending is NULL.
EFI_INVALID_PARAMETER	Time is NULL.
EFI_DEVICE_ERROR	The wakeup time could not be retrieved due to a hardware error.
EFI_UNSUPPORTED	This call is not supported by this platform at the time the call is made. The platform should describe this runtime service as unsupported at runtime via an EFI_RT_PROPERTIES_TABLE configuration table.

Definition at line 329 of file RuntimeLib.c.

EfiGoneVirtual()

BOOLEAN EFIAPI EfiGoneVirtual

(

VOID

)

This function allows the caller to determine if UEFI SetVirtualAddressMap() has been called.

This function returns TRUE after all the EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE functions have executed as a result of the OS calling SetVirtualAddressMap(). Prior to this time FALSE is returned. This function is used by runtime code to decide it is legal to access services that go away after SetVirtualAddressMap().

Return values

TRUE	The system has finished executing the EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE event.
FALSE	The system has not finished executing the EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE event.

Definition at line 188 of file RuntimeLib.c.

EfiQueryCapsuleCapabilities()

EFI_STATUS EFIAPI EfiQueryCapsuleCapabilities	(	IN EFI_CAPSULE_HEADER **	CapsuleHeaderArray,
		IN UINTN	CapsuleCount,
		OUT UINT64 *	MaximumCapsuleSize,
		OUT EFI_RESET_TYPE *	ResetType
	)

This service is a wrapper for the UEFI Runtime Service QueryCapsuleCapabilities().

The QueryCapsuleCapabilities() function allows a caller to test to see if a capsule or capsules can be updated via UpdateCapsule(). The Flags values in the capsule header and size of the entire capsule is checked. If the caller needs to query for generic capsule capability a fake EFI_CAPSULE_HEADER can be constructed where CapsuleImageSize is equal to HeaderSize that is equal to sizeof (EFI_CAPSULE_HEADER). To determine reset requirements, CAPSULE_FLAGS_PERSIST_ACROSS_RESET should be set in the Flags field of the EFI_CAPSULE_HEADER. The firmware must support any capsule that has the CAPSULE_FLAGS_PERSIST_ACROSS_RESET flag set in EFI_CAPSULE_HEADER. The firmware sets the policy for what capsules are supported that do not have the CAPSULE_FLAGS_PERSIST_ACROSS_RESET flag set.

Parameters

CapsuleHeaderArray	Virtual pointer to an array of virtual pointers to the capsules being passed into update capsule. The capsules are assumed to stored in contiguous virtual memory.
CapsuleCount	Number of pointers to EFI_CAPSULE_HEADER in CaspuleHeaderArray.
MaximumCapsuleSize	On output the maximum size that UpdateCapsule() can support as an argument to UpdateCapsule() via CapsuleHeaderArray and ScatterGatherList. Undefined on input.
ResetType	Returns the type of reset required for the capsule update.

Return values

EFI_SUCCESS	A valid answer was returned.
EFI_INVALID_PARAMETER	MaximumCapsuleSize is NULL.
EFI_UNSUPPORTED	The capsule type is not supported on this platform, and MaximumCapsuleSize and ResetType are undefined.
EFI_OUT_OF_RESOURCES	There were insufficient resources to process the query request.
EFI_UNSUPPORTED	This call is not supported by this platform at the time the call is made. The platform should describe this runtime service as unsupported at runtime via an EFI_RT_PROPERTIES_TABLE configuration table.

This service is a wrapper for the UEFI Runtime Service QueryCapsuleCapabilities().

The QueryCapsuleCapabilities() function allows a caller to test to see if a capsule or capsules can be updated via UpdateCapsule(). The Flags values in the capsule header and size of the entire capsule is checked. If the caller needs to query for generic capsule capability a fake EFI_CAPSULE_HEADER can be constructed where CapsuleImageSize is equal to HeaderSize that is equal to sizeof (EFI_CAPSULE_HEADER). To determine reset requirements, CAPSULE_FLAGS_PERSIST_ACROSS_RESET should be set in the Flags field of the EFI_CAPSULE_HEADER. The firmware must support any capsule that has the CAPSULE_FLAGS_PERSIST_ACROSS_RESET flag set in EFI_CAPSULE_HEADER. The firmware sets the policy for what capsules are supported that do not have the CAPSULE_FLAGS_PERSIST_ACROSS_RESET flag set.

Parameters

CapsuleHeaderArray	Virtual pointer to an array of virtual pointers to the capsules being passed into update capsule. The capsules are assumed to stored in contiguous virtual memory.
CapsuleCount	The number of pointers to EFI_CAPSULE_HEADER in CaspuleHeaderArray.
MaximumCapsuleSize	On output the maximum size that UpdateCapsule() can support as an argument to UpdateCapsule() via CapsuleHeaderArray and ScatterGatherList. Undefined on input.
ResetType	Returns the type of reset required for the capsule update.

Return values

EFI_SUCCESS	A valid answer was returned.
EFI_INVALID_PARAMETER	MaximumCapsuleSize is NULL.
EFI_UNSUPPORTED	The capsule type is not supported on this platform, and MaximumCapsuleSize and ResetType are undefined.
EFI_OUT_OF_RESOURCES	There were insufficient resources to process the query request.
EFI_UNSUPPORTED	This call is not supported by this platform at the time the call is made. The platform should describe this runtime service as unsupported at runtime via an EFI_RT_PROPERTIES_TABLE configuration table.

Definition at line 792 of file RuntimeLib.c.

EfiQueryVariableInfo()

EFI_STATUS EFIAPI EfiQueryVariableInfo	(	IN UINT32	Attributes,
		OUT UINT64 *	MaximumVariableStorageSize,
		OUT UINT64 *	RemainingVariableStorageSize,
		OUT UINT64 *	MaximumVariableSize
	)

This service is a wrapper for the UEFI Runtime Service QueryVariableInfo().

The QueryVariableInfo() function allows a caller to obtain the information about the maximum size of the storage space available for the EFI variables, the remaining size of the storage space available for the EFI variables and the maximum size of each individual EFI variable, associated with the attributes specified. The returned MaximumVariableStorageSize, RemainingVariableStorageSize, MaximumVariableSize information may change immediately after the call based on other runtime activities including asynchronous error events. Also, these values associated with different attributes are not additive in nature.

Parameters

Attributes	Attributes bitmask to specify the type of variables on which to return information. Refer to the GetVariable() function description.
MaximumVariableStorageSize	On output the maximum size of the storage space available for the EFI variables associated with the attributes specified.
RemainingVariableStorageSize	Returns the remaining size of the storage space available for the EFI variables associated with the attributes specified.
MaximumVariableSize	Returns the maximum size of the individual EFI variables associated with the attributes specified.

Return values

EFI_SUCCESS	A valid answer was returned.
EFI_INVALID_PARAMETER	An invalid combination of attribute bits was supplied.
EFI_UNSUPPORTED	EFI_UNSUPPORTED The attribute is not supported on this platform, and the MaximumVariableStorageSize, RemainingVariableStorageSize, MaximumVariableSize are undefined.

This service is a wrapper for the UEFI Runtime Service QueryVariableInfo().

The QueryVariableInfo() function allows a caller to obtain the information about the maximum size of the storage space available for the EFI variables, the remaining size of the storage space available for the EFI variables and the maximum size of each individual EFI variable, associated with the attributes specified. The returned MaximumVariableStorageSize, RemainingVariableStorageSize, MaximumVariableSize information may change immediately after the call based on other runtime activities including asynchronous error events. Also, these values associated with different attributes are not additive in nature.

Parameters

Attributes	Attributes bitmask to specify the type of variables on which to return information. Refer to the GetVariable() function description.
MaximumVariableStorageSize	On output the maximum size of the storage space available for the EFI variables associated with the attributes specified.
RemainingVariableStorageSize	Returns the remaining size of the storage space available for the EFI variables associated with the attributes specified..
MaximumVariableSize	Returns the maximum size of the individual EFI variables associated with the attributes specified.

Return values

EFI_SUCCESS	A valid answer was returned.
EFI_INVALID_PARAMETER	An invalid combination of attribute bits was supplied.
EFI_UNSUPPORTED	EFI_UNSUPPORTED The attribute is not supported on this platform, and the MaximumVariableStorageSize, RemainingVariableStorageSize, MaximumVariableSize are undefined.

Definition at line 843 of file RuntimeLib.c.

EfiResetSystem()

VOID EFIAPI EfiResetSystem	(	IN EFI_RESET_TYPE	ResetType,
		IN EFI_STATUS	ResetStatus,
		IN UINTN	DataSize,
		IN VOID *ResetData	OPTIONAL
	)

This service is a wrapper for the UEFI Runtime Service ResetSystem().

The ResetSystem()function resets the entire platform, including all processors and devices,and reboots the system. Calling this interface with ResetType of EfiResetCold causes a system-wide reset. This sets all circuitry within the system to its initial state. This type of reset is asynchronous to system operation and operates without regard to cycle boundaries. EfiResetCold is tantamount to a system power cycle. Calling this interface with ResetType of EfiResetWarm causes a system-wide initialization. The processors are set to their initial state, and pending cycles are not corrupted. If the system does not support this reset type, then an EfiResetCold must be performed. Calling this interface with ResetType of EfiResetShutdown causes the system to enter a power state equivalent to the ACPI G2/S5 or G3 states. If the system does not support this reset type, then when the system is rebooted, it should exhibit the EfiResetCold attributes. The platform may optionally log the parameters from any non-normal reset that occurs. The ResetSystem() function does not return.

Parameters

ResetType	The type of reset to perform.
ResetStatus	The status code for the reset. If the system reset is part of a normal operation, the status code would be EFI_SUCCESS. If the system reset is due to some type of failure the most appropriate EFI Status code would be used.
DataSizeThe	size, in bytes, of ResetData.
ResetData	For a ResetType of EfiResetCold, EfiResetWarm, or EfiResetShutdown the data buffer starts with a Null-terminated Unicode string, optionally followed by additional binary data. The string is a description that the caller may use to further indicate the reason for the system reset. ResetData is only valid if ResetStatus is something other then EFI_SUCCESS. This pointer must be a physical address. For a ResetType of EfiResetPlatformSpecific the data buffer also starts with a Null-terminated string that is followed by an EFI_GUID that describes the specific type of reset to perform.

This service is a wrapper for the UEFI Runtime Service ResetSystem().

The ResetSystem()function resets the entire platform, including all processors and devices,and reboots the system. Calling this interface with ResetType of EfiResetCold causes a system-wide reset. This sets all circuitry within the system to its initial state. This type of reset is asynchronous to system operation and operates without regard to cycle boundaries. EfiResetCold is tantamount to a system power cycle. Calling this interface with ResetType of EfiResetWarm causes a system-wide initialization. The processors are set to their initial state, and pending cycles are not corrupted. If the system does not support this reset type, then an EfiResetCold must be performed. Calling this interface with ResetType of EfiResetShutdown causes the system to enter a power state equivalent to the ACPI G2/S5 or G3 states. If the system does not support this reset type, then when the system is rebooted, it should exhibit the EfiResetCold attributes. The platform may optionally log the parameters from any non-normal reset that occurs. The ResetSystem() function does not return.

Parameters

ResetType	The type of reset to perform.
ResetStatus	The status code for the reset. If the system reset is part of a normal operation, the status code would be EFI_SUCCESS. If the system reset is due to some type of failure the most appropriate EFI Status code would be used.
DataSizeThe	size, in bytes, of ResetData.
ResetData	For a ResetType of EfiResetCold, EfiResetWarm, or EfiResetShutdown the data buffer starts with a Null-terminated Unicode string, optionally followed by additional binary data. The string is a description that the caller may use to further indicate the reason for the system reset. ResetData is only valid if ResetStatus is something other then EFI_SUCCESS. This pointer must be a physical address. For a ResetType of EfiRestUpdate the data buffer also starts with a Null-terminated string that is followed by a physical VOID * to an EFI_CAPSULE_HEADER.

Definition at line 226 of file RuntimeLib.c.

EfiSetTime()

EFI_STATUS EFIAPI EfiSetTime

(

IN EFI_TIME *

Time

)

This service is a wrapper for the UEFI Runtime Service SetTime().

The SetTime() function sets the real time clock device to the supplied time, and records the current time zone and daylight savings time information. The SetTime() function is not allowed to loop based on the current time. For example, if the device does not support a hardware reset for the sub-resolution time, the code is not to implement the feature by waiting for the time to wrap. During runtime, if a PC-AT CMOS device is present in the platform, the caller must synchronize access to the device before calling SetTime().

Parameters

Time

A pointer to the current time. Type EFI_TIME is defined in the GetTime() function description. Full error checking is performed on the different fields of the EFI_TIME structure (refer to the EFI_TIME definition in the GetTime() function description for full details), and EFI_INVALID_PARAMETER is returned if any field is out of range.

Return values

EFI_SUCCESS	The operation completed successfully.
EFI_INVALID_PARAMETER	A time field is out of range.
EFI_DEVICE_ERROR	The time could not be set due to a hardware error.
EFI_UNSUPPORTED	This call is not supported by this platform at the time the call is made. The platform should describe this runtime service as unsupported at runtime via an EFI_RT_PROPERTIES_TABLE configuration table.

This service is a wrapper for the UEFI Runtime Service SetTime().

The SetTime() function sets the real time clock device to the supplied time, and records the current time zone and daylight savings time information. The SetTime() function is not allowed to loop based on the current time. For example, if the device does not support a hardware reset for the sub-resolution time, the code is not to implement the feature by waiting for the time to wrap. During runtime, if a PC-AT CMOS device is present in the platform the caller must synchronize access to the device before calling SetTime().

Parameters

Time

A pointer to the current time. Type EFI_TIME is defined in the GetTime() function description. Full error checking is performed on the different fields of the EFI_TIME structure (refer to the EFI_TIME definition in the GetTime() function description for full details), and EFI_INVALID_PARAMETER is returned if any field is out of range.

Return values

EFI_SUCCESS	The operation completed successfully.
EFI_INVALID_PARAMETER	A time field is out of range.
EFI_DEVICE_ERROR	The time could not be set due to a hardware error.
EFI_UNSUPPORTED	This call is not supported by this platform at the time the call is made. The platform should describe this runtime service as unsupported at runtime via an EFI_RT_PROPERTIES_TABLE configuration table.

Definition at line 297 of file RuntimeLib.c.

EfiSetVariable()

EFI_STATUS EFIAPI EfiSetVariable	(	IN CHAR16 *	VariableName,
		IN EFI_GUID *	VendorGuid,
		IN UINT32	Attributes,
		IN UINTN	DataSize,
		IN VOID *	Data
	)

This service is a wrapper for the UEFI Runtime Service GetNextVariableName()

Variables are stored by the firmware and may maintain their values across power cycles. Each vendor may create and manage its own variables without the risk of name conflicts by using a unique VendorGuid.

Parameters

VariableName	the name of the vendor's variable, as a Null-Terminated Unicode String
VendorGuid	Unify identifier for vendor.
Attributes	Point to memory location to return the attributes of variable. If the point is NULL, the parameter would be ignored.
DataSize	The size in bytes of Data-Buffer.
Data	Point to the content of the variable.

Return values

EFI_SUCCESS	The firmware has successfully stored the variable and its data as defined by the Attributes.
EFI_INVALID_PARAMETER	An invalid combination of attribute bits was supplied, or the DataSize exceeds the maximum allowed.
EFI_INVALID_PARAMETER	VariableName is an empty Unicode string.
EFI_OUT_OF_RESOURCES	Not enough storage is available to hold the variable and its data.
EFI_DEVICE_ERROR	The variable could not be saved due to a hardware failure.
EFI_WRITE_PROTECTED	The variable in question is read-only.
EFI_WRITE_PROTECTED	The variable in question cannot be deleted.
EFI_SECURITY_VIOLATION	The variable could not be written due to EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS set but the AuthInfo does NOT pass the validation check carried out by the firmware.
EFI_NOT_FOUND	The variable trying to be updated or deleted was not found.
EFI_UNSUPPORTED	This call is not supported by this platform at the time the call is made. The platform should describe this runtime service as unsupported at runtime via an EFI_RT_PROPERTIES_TABLE configuration table.

This service is a wrapper for the UEFI Runtime Service GetNextVariableName()

Variables are stored by the firmware and may maintain their values across power cycles. Each vendor may create and manage its own variables without the risk of name conflicts by using a unique VendorGuid.

Parameters

VariableName	The name of the vendor's variable; it's a Null-Terminated Unicode String
VendorGuid	Unify identifier for vendor.
Attributes	Points to a memory location to return the attributes of variable. If the point is NULL, the parameter would be ignored.
DataSize	The size in bytes of Data-Buffer.
Data	Points to the content of the variable.

Return values

EFI_SUCCESS	The firmware has successfully stored the variable and its data as defined by the Attributes.
EFI_INVALID_PARAMETER	An invalid combination of attribute bits was supplied, or the DataSize exceeds the maximum allowed.
EFI_INVALID_PARAMETER	VariableName is an empty Unicode string.
EFI_OUT_OF_RESOURCES	Not enough storage is available to hold the variable and its data.
EFI_DEVICE_ERROR	The variable could not be saved due to a hardware failure.
EFI_WRITE_PROTECTED	The variable in question is read-only.
EFI_WRITE_PROTECTED	The variable in question cannot be deleted.
EFI_SECURITY_VIOLATION	The variable could not be written due to EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS set but the AuthInfo does NOT pass the validation check carried out by the firmware.
EFI_NOT_FOUND	The variable trying to be updated or deleted was not found.
EFI_UNSUPPORTED	This call is not supported by this platform at the time the call is made. The platform should describe this runtime service as unsupported at runtime via an EFI_RT_PROPERTIES_TABLE configuration table.

Definition at line 498 of file RuntimeLib.c.

EfiSetVirtualAddressMap()

EFI_STATUS EFIAPI EfiSetVirtualAddressMap	(	IN UINTN	MemoryMapSize,
		IN UINTN	DescriptorSize,
		IN UINT32	DescriptorVersion,
		IN CONST EFI_MEMORY_DESCRIPTOR *	VirtualMap
	)

This service is a wrapper for the UEFI Runtime Service SetVirtualAddressMap().

The SetVirtualAddressMap() function is used by the OS loader. The function can only be called at runtime, and is called by the owner of the system's memory map. I.e., the component which called ExitBootServices(). All events of type EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE must be signaled before SetVirtualAddressMap() returns.

Parameters

MemoryMapSize	The size in bytes of VirtualMap.
DescriptorSize	The size in bytes of an entry in the VirtualMap.
DescriptorVersion	The version of the structure entries in VirtualMap.
VirtualMap	An array of memory descriptors which contain new virtual address mapping information for all runtime ranges. Type EFI_MEMORY_DESCRIPTOR is defined in the GetMemoryMap() function description.

Return values

EFI_SUCCESS	The virtual address map has been applied.
EFI_UNSUPPORTED	EFI firmware is not at runtime, or the EFI firmware is already in virtual address mapped mode.
EFI_INVALID_PARAMETER	DescriptorSize or DescriptorVersion is invalid.
EFI_NO_MAPPING	A virtual address was not supplied for a range in the memory map that requires a mapping.
EFI_NOT_FOUND	A virtual address was supplied for an address that is not found in the memory map.
EFI_UNSUPPORTED	This call is not supported by this platform at the time the call is made. The platform should describe this runtime service as unsupported at runtime via an EFI_RT_PROPERTIES_TABLE configuration table.

Definition at line 686 of file RuntimeLib.c.

EfiSetWakeupTime()

EFI_STATUS EFIAPI EfiSetWakeupTime	(	IN BOOLEAN	Enable,
		IN EFI_TIME *Time	OPTIONAL
	)

This service is a wrapper for the UEFI Runtime Service SetWakeupTime()

Setting a system wakeup alarm causes the system to wake up or power on at the set time. When the alarm fires, the alarm signal is latched until it is acknowledged by calling SetWakeupTime() to disable the alarm. If the alarm fires before the system is put into a sleeping or off state, since the alarm signal is latched the system will immediately wake up. If the alarm fires while the system is off and there is insufficient power to power on the system, the system is powered on when power is restored.

Parameters

Enable	Enable or disable the wakeup alarm.
Time	If Enable is TRUE, the time to set the wakeup alarm for. Type EFI_TIME is defined in the GetTime() function description. If Enable is FALSE, then this parameter is optional, and may be NULL.

Return values

EFI_SUCCESS	If Enable is TRUE, then the wakeup alarm was enabled. If Enable is FALSE, then the wakeup alarm was disabled.
EFI_INVALID_PARAMETER	A time field is out of range.
EFI_DEVICE_ERROR	The wakeup time could not be set due to a hardware error.
EFI_UNSUPPORTED	This call is not supported by this platform at the time the call is made. The platform should describe this runtime service as unsupported at runtime via an EFI_RT_PROPERTIES_TABLE configuration table.

Definition at line 364 of file RuntimeLib.c.

EfiUpdateCapsule()

EFI_STATUS EFIAPI EfiUpdateCapsule	(	IN EFI_CAPSULE_HEADER **	CapsuleHeaderArray,
		IN UINTN	CapsuleCount,
		IN EFI_PHYSICAL_ADDRESS ScatterGatherList	OPTIONAL
	)

This service is a wrapper for the UEFI Runtime Service UpdateCapsule().

Passes capsules to the firmware with both virtual and physical mapping. Depending on the intended consumption, the firmware may process the capsule immediately. If the payload should persist across a system reset, the reset value returned from EFI_QueryCapsuleCapabilities must be passed into ResetSystem() and will cause the capsule to be processed by the firmware as part of the reset process.

Parameters

CapsuleHeaderArray	Virtual pointer to an array of virtual pointers to the capsules being passed into update capsule. Each capsules is assumed to stored in contiguous virtual memory. The capsules in the CapsuleHeaderArray must be the same capsules as the ScatterGatherList. The CapsuleHeaderArray must have the capsules in the same order as the ScatterGatherList.
CapsuleCount	Number of pointers to EFI_CAPSULE_HEADER in CaspuleHeaderArray.
ScatterGatherList	Physical pointer to a set of EFI_CAPSULE_BLOCK_DESCRIPTOR that describes the location in physical memory of a set of capsules. See Related Definitions for an explanation of how more than one capsule is passed via this interface. The capsules in the ScatterGatherList must be in the same order as the CapsuleHeaderArray. This parameter is only referenced if the capsules are defined to persist across system reset.

Return values

EFI_SUCCESS	A valid capsule was passed. If CAPSULE_FLAGS_PERSIT_ACROSS_RESET is not set, the capsule has been successfully processed by the firmware.
EFI_INVALID_PARAMETER	CapsuleSize is NULL, or an incompatible set of flags were set in the capsule header.
EFI_INVALID_PARAMETER	CapsuleCount is 0
EFI_DEVICE_ERROR	The capsule update was started, but failed due to a device error.
EFI_UNSUPPORTED	The capsule type is not supported on this platform.
EFI_OUT_OF_RESOURCES	There were insufficient resources to process the capsule.
EFI_UNSUPPORTED	This call is not supported by this platform at the time the call is made. The platform should describe this runtime service as unsupported at runtime via an EFI_RT_PROPERTIES_TABLE configuration table.

This service is a wrapper for the UEFI Runtime Service UpdateCapsule().

Passes capsules to the firmware with both virtual and physical mapping. Depending on the intended consumption, the firmware may process the capsule immediately. If the payload should persist across a system reset, the reset value returned from EFI_QueryCapsuleCapabilities must be passed into ResetSystem() and will cause the capsule to be processed by the firmware as part of the reset process.

Parameters

CapsuleHeaderArray	Virtual pointer to an array of virtual pointers to the capsules being passed into update capsule. Each capsules is assumed to stored in contiguous virtual memory. The capsules in the CapsuleHeaderArray must be the same capsules as the ScatterGatherList. The CapsuleHeaderArray must have the capsules in the same order as the ScatterGatherList.
CapsuleCount	The number of pointers to EFI_CAPSULE_HEADER in CaspuleHeaderArray.
ScatterGatherList	Physical pointer to a set of EFI_CAPSULE_BLOCK_DESCRIPTOR that describes the location in physical memory of a set of capsules. See Related Definitions for an explanation of how more than one capsule is passed via this interface. The capsules in the ScatterGatherList must be in the same order as the CapsuleHeaderArray. This parameter is only referenced if the capsules are defined to persist across system reset.

Return values

EFI_SUCCESS	Valid capsule was passed. If CAPSULE_FLAGS_PERSIT_ACROSS_RESET is not set, the capsule has been successfully processed by the firmware.
EFI_INVALID_PARAMETER	CapsuleSize or HeaderSize is NULL.
EFI_INVALID_PARAMETER	CapsuleCount is 0
EFI_DEVICE_ERROR	The capsule update was started, but failed due to a device error.
EFI_UNSUPPORTED	The capsule type is not supported on this platform.
EFI_OUT_OF_RESOURCES	There were insufficient resources to process the capsule.
EFI_UNSUPPORTED	This call is not supported by this platform at the time the call is made. The platform should describe this runtime service as unsupported at runtime via an EFI_RT_PROPERTIES_TABLE configuration table.

Definition at line 740 of file RuntimeLib.c.