path: root/MdePkg/Include/Uefi/UefiSpec.h

/** @file
  Include file that supports UEFI.

  This include file must contain things defined in the UEFI 2.5 specification.
  If a code construct is defined in the UEFI 2.5 specification it must be included
  by this include file.

Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials are licensed and made available under 
the terms and conditions of the BSD License that 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 __UEFI_SPEC_H__
#define __UEFI_SPEC_H__

#include <Uefi/UefiMultiPhase.h>

#include <Protocol/DevicePath.h>
#include <Protocol/SimpleTextIn.h>
#include <Protocol/SimpleTextInEx.h>
#include <Protocol/SimpleTextOut.h>

///
/// Enumeration of EFI memory allocation types.
///
typedef enum {
  ///
  /// Allocate any available range of pages that satisfies the request.
  ///
  AllocateAnyPages,
  ///
  /// Allocate any available range of pages whose uppermost address is less than 
  /// or equal to a specified maximum address.
  ///
  AllocateMaxAddress,
  ///
  /// Allocate pages at a specified address.
  ///
  AllocateAddress,
  ///
  /// Maximum enumeration value that may be used for bounds checking.
  ///
  MaxAllocateType
} EFI_ALLOCATE_TYPE;

//
// Bit definitions for EFI_TIME.Daylight
//
#define EFI_TIME_ADJUST_DAYLIGHT  0x01
#define EFI_TIME_IN_DAYLIGHT      0x02

///
/// Value definition for EFI_TIME.TimeZone.
///
#define EFI_UNSPECIFIED_TIMEZONE  0x07FF

//
// Memory cacheability attributes
//
#define EFI_MEMORY_UC               0x0000000000000001ULL
#define EFI_MEMORY_WC               0x0000000000000002ULL
#define EFI_MEMORY_WT               0x0000000000000004ULL
#define EFI_MEMORY_WB               0x0000000000000008ULL
#define EFI_MEMORY_UCE              0x0000000000000010ULL
//
// Physical memory protection attributes
//
// Note: UEFI spec 2.5 and following: use EFI_MEMORY_RO as write-protected physical memory
// protection attribute. Also, EFI_MEMORY_WP means cacheability attribute.
//
#define EFI_MEMORY_WP               0x0000000000001000ULL
#define EFI_MEMORY_RP               0x0000000000002000ULL
#define EFI_MEMORY_XP               0x0000000000004000ULL
#define EFI_MEMORY_RO               0x0000000000020000ULL
//
// Physical memory persistence attribute. 
// The memory region supports byte-addressable non-volatility.
//
#define EFI_MEMORY_NV               0x0000000000008000ULL
//
// The memory region provides higher reliability relative to other memory in the system.
// If all memory has the same reliability, then this bit is not used.
//
#define EFI_MEMORY_MORE_RELIABLE    0x0000000000010000ULL
//
// Runtime memory attribute
//
#define EFI_MEMORY_RUNTIME          0x8000000000000000ULL

///
/// Memory descriptor version number.
///
#define EFI_MEMORY_DESCRIPTOR_VERSION 1

///
/// Definition of an EFI memory descriptor.
///
typedef struct {
  ///
  /// Type of the memory region.  See EFI_MEMORY_TYPE.
  ///
  UINT32                Type;
  ///
  /// Physical address of the first byte of the memory region.  Must aligned 
  /// on a 4 KB boundary.
  ///
  EFI_PHYSICAL_ADDRESS  PhysicalStart;
  ///
  /// Virtual address of the first byte of the memory region.  Must aligned 
  /// on a 4 KB boundary.
  ///
  EFI_VIRTUAL_ADDRESS   VirtualStart;
  ///
  /// Number of 4KB pages in the memory region.
  ///
  UINT64                NumberOfPages;
  ///
  /// Attributes of the memory region that describe the bit mask of capabilities
  /// for that memory region, and not necessarily the current settings for that 
  /// memory region.
  ///
  UINT64                Attribute;
} EFI_MEMORY_DESCRIPTOR;

/**
  Allocates memory pages from the system.

  @param[in]       Type         The type of allocation to perform.
  @param[in]       MemoryType   The type of memory to allocate.
                                MemoryType values in the range 0x70000000..0x7FFFFFFF
                                are reserved for OEM use. MemoryType values in the range
                                0x80000000..0xFFFFFFFF are reserved for use by UEFI OS loaders
                                that are provided by operating system vendors. The only illegal
                                memory type values are those in the range EfiMaxMemoryType..0x6FFFFFFF.
  @param[in]       Pages        The number of contiguous 4 KB pages to allocate.
  @param[in, out]  Memory       The pointer to a physical address. On input, the way in which the address is
                                used depends on the value of Type.

  @retval EFI_SUCCESS           The requested pages were allocated.
  @retval EFI_INVALID_PARAMETER 1) Type is not AllocateAnyPages or
                                AllocateMaxAddress or AllocateAddress.
                                2) MemoryType is in the range
                                EfiMaxMemoryType..0x6FFFFFFF.
                                3) Memory is NULL.
                                4) MemoryType was EfiPersistentMemory.
  @retval EFI_OUT_OF_RESOURCES  The pages could not be allocated.
  @retval EFI_NOT_FOUND         The requested pages could not be found.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_ALLOCATE_PAGES)(
  IN     EFI_ALLOCATE_TYPE            Type,
  IN     EFI_MEMORY_TYPE              MemoryType,
  IN     UINTN                        Pages,
  IN OUT EFI_PHYSICAL_ADDRESS         *Memory
  );

/**
  Frees memory pages.

  @param[in]  Memory      The base physical address of the pages to be freed.
  @param[in]  Pages       The number of contiguous 4 KB pages to free.

  @retval EFI_SUCCESS           The requested pages were freed.
  @retval EFI_INVALID_PARAMETER Memory is not a page-aligned address or Pages is invalid.
  @retval EFI_NOT_FOUND         The requested memory pages were not allocated with
                                AllocatePages().

**/
typedef
EFI_STATUS
(EFIAPI *EFI_FREE_PAGES)(
  IN  EFI_PHYSICAL_ADDRESS         Memory,
  IN  UINTN                        Pages
  );

/**
  Returns the current memory map.

  @param[in, out]  MemoryMapSize         A pointer to the size, in bytes, of the MemoryMap buffer.
                                         On input, this is the size of the buffer allocated by the caller.
                                         On output, it is the size of the buffer returned by the firmware if
                                         the buffer was large enough, or the size of the buffer needed to contain
                                         the map if the buffer was too small.
  @param[in, out]  MemoryMap             A pointer to the buffer in which firmware places the current memory
                                         map.
  @param[out]      MapKey                A pointer to the location in which firmware returns the key for the
                                         current memory map.
  @param[out]      DescriptorSize        A pointer to the location in which firmware returns the size, in bytes, of
                                         an individual EFI_MEMORY_DESCRIPTOR.
  @param[out]      DescriptorVersion     A pointer to the location in which firmware returns the version number
                                         associated with the EFI_MEMORY_DESCRIPTOR.

  @retval EFI_SUCCESS           The memory map was returned in the MemoryMap buffer.
  @retval EFI_BUFFER_TOO_SMALL  The MemoryMap buffer was too small. The current buffer size
                                needed to hold the memory map is returned in MemoryMapSize.
  @retval EFI_INVALID_PARAMETER 1) MemoryMapSize is NULL.
                                2) The MemoryMap buffer is not too small and MemoryMap is
                                   NULL.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_GET_MEMORY_MAP)(
  IN OUT UINTN                       *MemoryMapSize,
  IN OUT EFI_MEMORY_DESCRIPTOR       *MemoryMap,
  OUT    UINTN                       *MapKey,
  OUT    UINTN                       *DescriptorSize,
  OUT    UINT32                      *DescriptorVersion
  );

/**
  Allocates pool memory.

  @param[in]   PoolType         The type of pool to allocate.
                                MemoryType values in the range 0x70000000..0x7FFFFFFF
                                are reserved for OEM use. MemoryType values in the range
                                0x80000000..0xFFFFFFFF are reserved for use by UEFI OS loaders
                                that are provided by operating system vendors. The only illegal
                                memory type values are those in the range EfiMaxMemoryType..0x6FFFFFFF.
  @param[in]   Size             The number of bytes to allocate from the pool.
  @param[out]  Buffer           A pointer to a pointer to the allocated buffer if the call succeeds;
                                undefined otherwise.

  @retval EFI_SUCCESS           The requested number of bytes was allocated.
  @retval EFI_OUT_OF_RESOURCES  The pool requested could not be allocated.
  @retval EFI_INVALID_PARAMETER PoolType was invalid or Buffer is NULL.
                                PoolType was EfiPersistentMemory.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_ALLOCATE_POOL)(
  IN  EFI_MEMORY_TYPE              PoolType,
  IN  UINTN                        Size,
  OUT VOID                         **Buffer
  );

/**
  Returns pool memory to the system.

  @param[in]  Buffer            The pointer to the buffer to free.

  @retval EFI_SUCCESS           The memory was returned to the system.
  @retval EFI_INVALID_PARAMETER Buffer was invalid.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_FREE_POOL)(
  IN  VOID                         *Buffer
  );

/**
  Changes the runtime addressing mode of EFI firmware from physical to virtual.

  @param[in]  MemoryMapSize     The size in bytes of VirtualMap.
  @param[in]  DescriptorSize    The size in bytes of an entry in the VirtualMap.
  @param[in]  DescriptorVersion The version of the structure entries in VirtualMap.
  @param[in]  VirtualMap        An array of memory descriptors which contain new virtual
                                address mapping information for all runtime ranges.

  @retval EFI_SUCCESS           The virtual address map has been applied.
  @retval EFI_UNSUPPORTED       EFI firmware is not at runtime, or the EFI firmware is already in
                                virtual address mapped mode.
  @retval EFI_INVALID_PARAMETER DescriptorSize or DescriptorVersion is invalid.
  @retval EFI_NO_MAPPING        A virtual address was not supplied for a range in the memory
                                map that requires a mapping.
  @retval EFI_NOT_FOUND         A virtual address was supplied for an address that is not found
                                in the memory map.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_SET_VIRTUAL_ADDRESS_MAP)(
  IN  UINTN                        MemoryMapSize,
  IN  UINTN                        DescriptorSize,
  IN  UINT32                       DescriptorVersion,
  IN  EFI_MEMORY_DESCRIPTOR        *VirtualMap
  );

/**
  Connects one or more drivers to a controller.

  @param[in]  ControllerHandle      The handle of the controller to which driver(s) are to be connected.
  @param[in]  DriverImageHandle     A pointer to an ordered list handles that support the
                                    EFI_DRIVER_BINDING_PROTOCOL.
  @param[in]  RemainingDevicePath   A pointer to the device path that specifies a child of the
                                    controller specified by ControllerHandle.
  @param[in]  Recursive             If TRUE, then ConnectController() is called recursively
                                    until the entire tree of controllers below the controller specified
                                    by ControllerHandle have been created. If FALSE, then
                                    the tree of controllers is only expanded one level.

  @retval EFI_SUCCESS           1) One or more drivers were connected to ControllerHandle.
                                2) No drivers were connected to ControllerHandle, but
                                RemainingDevicePath is not NULL, and it is an End Device
                                Path Node.
  @retval EFI_INVALID_PARAMETER ControllerHandle is NULL.
  @retval EFI_NOT_FOUND         1) There are no EFI_DRIVER_BINDING_PROTOCOL instances
                                present in the system.
                                2) No drivers were connected to ControllerHandle.
  @retval EFI_SECURITY_VIOLATION 
                                The user has no permission to start UEFI device drivers on the device path 
                                associated with the ControllerHandle or specified by the RemainingDevicePath.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_CONNECT_CONTROLLER)(
  IN  EFI_HANDLE                    ControllerHandle,
  IN  EFI_HANDLE                    *DriverImageHandle,   OPTIONAL
  IN  EFI_DEVICE_PATH_PROTOCOL      *RemainingDevicePath, OPTIONAL
  IN  BOOLEAN                       Recursive
  );

/**
  Disconnects one or more drivers from a controller.

  @param[in]  ControllerHandle      The handle of the controller from which driver(s) are to be disconnected.
  @param[in]  DriverImageHandle     The driver to disconnect from ControllerHandle.
                                    If DriverImageHandle is NULL, then all the drivers currently managing
                                    ControllerHandle are disconnected from ControllerHandle.
  @param[in]  ChildHandle           The handle of the child to destroy.
                                    If ChildHandle is NULL, then all the children of ControllerHandle are
                                    destroyed before the drivers are disconnected from ControllerHandle.

  @retval EFI_SUCCESS           1) One or more drivers were disconnected from the controller.
                                2) On entry, no drivers are managing ControllerHandle.
                                3) DriverImageHandle is not NULL, and on entry
                                   DriverImageHandle is not managing ControllerHandle.
  @retval EFI_INVALID_PARAMETER 1) ControllerHandle is NULL.
                                2) DriverImageHandle is not NULL, and it is not a valid EFI_HANDLE.
                                3) ChildHandle is not NULL, and it is not a valid EFI_HANDLE.
                                4) DriverImageHandle does not support the EFI_DRIVER_BINDING_PROTOCOL.
  @retval EFI_OUT_OF_RESOURCES  There are not enough resources available to disconnect any drivers from
                                ControllerHandle.
  @retval EFI_DEVICE_ERROR      The controller could not be disconnected because of a device error.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_DISCONNECT_CONTROLLER)(
  IN  EFI_HANDLE                     ControllerHandle,
  IN  EFI_HANDLE                     DriverImageHandle, OPTIONAL
  IN  EFI_HANDLE                     ChildHandle        OPTIONAL
  );



//
// ConvertPointer DebugDisposition type.
//
#define EFI_OPTIONAL_PTR     0x00000001

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

  @param[in]       DebugDisposition  Supplies type information for the pointer being converted.
  @param[in, out]  Address           A pointer to a pointer that is to be fixed to be the value needed
                                     for the new virtual address mappings being applied.

  @retval EFI_SUCCESS           The pointer pointed to by Address was modified.
  @retval EFI_INVALID_PARAMETER 1) Address is NULL.
                                2) *Address is NULL and DebugDisposition does
                                not have the EFI_OPTIONAL_PTR bit set.
  @retval EFI_NOT_FOUND         The pointer pointed to by Address was not found to be part
                                of the current memory map. This is normally fatal.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_CONVERT_POINTER)(
  IN     UINTN                      DebugDisposition,
  IN OUT VOID                       **Address
  );


//
// These types can be ORed together as needed - for example,
// EVT_TIMER might be Ored with EVT_NOTIFY_WAIT or
// EVT_NOTIFY_SIGNAL.
//
#define EVT_TIMER                         0x80000000
#define EVT_RUNTIME                       0x40000000
#define EVT_NOTIFY_WAIT                   0x00000100
#define EVT_NOTIFY_SIGNAL                 0x00000200

#define EVT_SIGNAL_EXIT_BOOT_SERVICES     0x00000201
#define EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE 0x60000202

//
// The event's NotifyContext pointer points to a runtime memory
// address.
// The event is deprecated in UEFI2.0 and later specifications.
//
#define EVT_RUNTIME_CONTEXT               0x20000000


/**
  Invoke a notification event

  @param[in]  Event                 Event whose notification function is being invoked.
  @param[in]  Context               The pointer to the notification function's context,
                                    which is implementation-dependent.

**/
typedef
VOID
(EFIAPI *EFI_EVENT_NOTIFY)(
  IN  EFI_EVENT                Event,
  IN  VOID                     *Context
  );

/**
  Creates an event.

  @param[in]   Type             The type of event to create and its mode and attributes.
  @param[in]   NotifyTpl        The task priority level of event notifications, if needed.
  @param[in]   NotifyFunction   The pointer to the event's notification function, if any.
  @param[in]   NotifyContext    The pointer to the notification function's context; corresponds to parameter
                                Context in the notification function.
  @param[out]  Event            The pointer to the newly created event if the call succeeds; undefined
                                otherwise.

  @retval EFI_SUCCESS           The event structure was created.
  @retval EFI_INVALID_PARAMETER One or more parameters are invalid.
  @retval EFI_OUT_OF_RESOURCES  The event could not be allocated.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_CREATE_EVENT)(
  IN  UINT32                       Type,
  IN  EFI_TPL                      NotifyTpl,
  IN  EFI_EVENT_NOTIFY             NotifyFunction,
  IN  VOID                         *NotifyContext,
  OUT EFI_EVENT                    *Event
  );

/**
  Creates an event in a group.

  @param[in]   Type             The type of event to create and its mode and attributes.
  @param[in]   NotifyTpl        The task priority level of event notifications,if needed.
  @param[in]   NotifyFunction   The pointer to the event's notification function, if any.
  @param[in]   NotifyContext    The pointer to the notification function's context; corresponds to parameter
                                Context in the notification function.
  @param[in]   EventGroup       The pointer to the unique identifier of the group to which this event belongs.
                                If this is NULL, then the function behaves as if the parameters were passed
                                to CreateEvent.
  @param[out]  Event            The pointer to the newly created event if the call succeeds; undefined
                                otherwise.

  @retval EFI_SUCCESS           The event structure was created.
  @retval EFI_INVALID_PARAMETER One or more parameters are invalid.
  @retval EFI_OUT_OF_RESOURCES  The event could not be allocated.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_CREATE_EVENT_EX)(
  IN       UINT32                 Type,
  IN       EFI_TPL                NotifyTpl,
  IN       EFI_EVENT_NOTIFY       NotifyFunction OPTIONAL,
  IN CONST VOID                   *NotifyContext OPTIONAL,
  IN CONST EFI_GUID               *EventGroup    OPTIONAL,
  OUT      EFI_EVENT              *Event
  );

///
/// Timer delay types
///
typedef enum {
  ///
  /// An event's timer settings is to be cancelled and not trigger time is to be set/
  ///
  TimerCancel,
  ///
  /// An event is to be signaled periodically at a specified interval from the current time.
  ///
  TimerPeriodic,
  ///
  /// An event is to be signaled once at a specified interval from the current time.
  ///
  TimerRelative
} EFI_TIMER_DELAY;

/**
  Sets the type of timer and the trigger time for a timer event.

  @param[in]  Event             The timer event that is to be signaled at the specified time.
  @param[in]  Type              The type of time that is specified in TriggerTime.
  @param[in]  TriggerTime       The number of 100ns units until the timer expires.
                                A TriggerTime of 0 is legal.
                                If Type is TimerRelative and TriggerTime is 0, then the timer
                                event will be signaled on the next timer tick.
                                If Type is TimerPeriodic and TriggerTime is 0, then the timer
                                event will be signaled on every timer tick.

  @retval EFI_SUCCESS           The event has been set to be signaled at the requested time.
  @retval EFI_INVALID_PARAMETER Event or Type is not valid.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_SET_TIMER)(
  IN  EFI_EVENT                Event,
  IN  EFI_TIMER_DELAY          Type,
  IN  UINT64                   TriggerTime
  );

/**
  Signals an event.

  @param[in]  Event             The event to signal.

  @retval EFI_SUCCESS           The event has been signaled.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_SIGNAL_EVENT)(
  IN  EFI_EVENT                Event
  );

/**
  Stops execution until an event is signaled.

  @param[in]   NumberOfEvents   The number of events in the Event array.
  @param[in]   Event            An array of EFI_EVENT.
  @param[out]  Index            The pointer to the index of the event which satisfied the wait condition.

  @retval EFI_SUCCESS           The event indicated by Index was signaled.
  @retval EFI_INVALID_PARAMETER 1) NumberOfEvents is 0.
                                2) The event indicated by Index is of type
                                   EVT_NOTIFY_SIGNAL.
  @retval EFI_UNSUPPORTED       The current TPL is not TPL_APPLICATION.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_WAIT_FOR_EVENT)(
  IN  UINTN                    NumberOfEvents,
  IN  EFI_EVENT                *Event,
  OUT UINTN                    *Index
  );

/**
  Closes an event.

  @param[in]  Event             The event to close.

  @retval EFI_SUCCESS           The event has been closed.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_CLOSE_EVENT)(
  IN EFI_EVENT                Event
  );

/**
  Checks whether an event is in the signaled state.

  @param[in]  Event             The event to check.

  @retval EFI_SUCCESS           The event is in the signaled state.
  @retval EFI_NOT_READY         The event is not in the signaled state.
  @retval EFI_INVALID_PARAMETER Event is of type EVT_NOTIFY_SIGNAL.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_CHECK_EVENT)(
  IN EFI_EVENT                Event
  );


//
// Task priority level
//
#define TPL_APPLICATION       4
#define TPL_CALLBACK          8
#define TPL_NOTIFY            16
#define TPL_HIGH_LEVEL        31


/**
  Raises a task's priority level and returns its previous level.

  @param[in]  NewTpl          The new task priority level.

  @return Previous task priority level

**/
typedef
EFI_TPL
(EFIAPI *EFI_RAISE_TPL)(
  IN EFI_TPL      NewTpl
  );

/**
  Restores a task's priority level to its previous value.

  @param[in]  OldTpl          The previous task priority level to restore.

**/
typedef
VOID
(EFIAPI *EFI_RESTORE_TPL)(
  IN EFI_TPL      OldTpl
  );

/**
  Returns the value of a variable.

  @param[in]       VariableName  A Null-terminated string that is the name of the vendor's
                                 variable.
  @param[in]       VendorGuid    A unique identifier for the vendor.
  @param[out]      Attributes    If not NULL, a pointer to the memory location to return the
                                 attributes bitmask for the variable.
  @param[in, out]  DataSize      On input, the size in bytes of the return Data buffer.
                                 On output the size of data returned in Data.
  @param[out]      Data          The buffer to return the contents of the variable.

  @retval EFI_SUCCESS            The function completed successfully.
  @retval EFI_NOT_FOUND          The variable was not found.
  @retval EFI_BUFFER_TOO_SMALL   The DataSize is too small for the result.
  @retval EFI_INVALID_PARAMETER  VariableName is NULL.
  @retval EFI_INVALID_PARAMETER  VendorGuid is NULL.
  @retval EFI_INVALID_PARAMETER  DataSize is NULL.
  @retval EFI_INVALID_PARAMETER  The DataSize is not too small and Data is NULL.
  @retval EFI_DEVICE_ERROR       The variable could not be retrieved due to a hardware error.
  @retval EFI_SECURITY_VIOLATION The variable could not be retrieved due to an authentication failure.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_GET_VARIABLE)(
  IN     CHAR16                      *VariableName,
  IN     EFI_GUID                    *VendorGuid,
  OUT    UINT32                      *Attributes,    OPTIONAL
  IN OUT UINTN                       *DataSize,
  OUT    VOID                        *Data
  );

/**
  Enumerates the current variable names.

  @param[in, out]  VariableNameSize The size of the VariableName buffer.
  @param[in, out]  VariableName     On input, supplies the last VariableName that was returned
                                    by GetNextVariableName(). On output, returns the Nullterminated
                                    string of the current variable.
  @param[in, out]  VendorGuid       On input, supplies the last VendorGuid that was returned by
                                    GetNextVariableName(). On output, returns the
                                    VendorGuid of the current variable.

  @retval EFI_SUCCESS           The function completed successfully.
  @retval EFI_NOT_FOUND         The next variable was not found.
  @retval EFI_BUFFER_TOO_SMALL  The VariableNameSize is too small for the result.
  @retval EFI_INVALID_PARAMETER VariableNameSize is NULL.
  @retval EFI_INVALID_PARAMETER VariableName is NULL.
  @retval EFI_INVALID_PARAMETER VendorGuid is NULL.
  @retval EFI_DEVICE_ERROR      The variable could not be retrieved due to a hardware error.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_GET_NEXT_VARIABLE_NAME)(
  IN OUT UINTN                    *VariableNameSize,
  IN OUT CHAR16                   *VariableName,
  IN OUT EFI_GUID                 *VendorGuid
  );

/**
  Sets the value of a variable.

  @param[in]  VariableName       A Null-terminated string that is the name of the vendor's variable.
                                 Each VariableName is unique for each VendorGuid. VariableName must
                                 contain 1 or more characters. If VariableName is an empty string,
                                 then EFI_INVALID_PARAMETER is returned.
  @param[in]  VendorGuid         A unique identifier for the vendor.
  @param[in]  Attributes         Attributes bitmask to set for the variable.
  @param[in]  DataSize           The size in bytes of the Data buffer. Unless the EFI_VARIABLE_APPEND_WRITE, 
                                 EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS, or 
                                 EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS attribute is set, a size of zero 
                                 causes the variable to be deleted. When the EFI_VARIABLE_APPEND_WRITE attribute is 
                                 set, then a SetVariable() call with a DataSize of zero will not cause any change to 
                                 the variable value (the timestamp associated with the variable may be updated however 
                                 even if no new data value is provided,see the description of the 
                                 EFI_VARIABLE_AUTHENTICATION_2 descriptor below. In this case the DataSize will not 
                                 be zero since the EFI_VARIABLE_AUTHENTICATION_2 descriptor will be populated). 
  @param[in]  Data               The contents for the variable.

  @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, name, and GUID was supplied, or the
                                 DataSize exceeds the maximum allowed.
  @retval EFI_INVALID_PARAMETER  VariableName is an empty string.
  @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 retrieved due to a hardware error.
  @retval EFI_WRITE_PROTECTED    The variable in question is read-only.
  @retval EFI_WRITE_PROTECTED    The variable in question cannot be deleted.
  @retval EFI_SECURITY_VIOLATION The variable could not be written due to EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS 
                                 or EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACESS being set, but the AuthInfo 
                                 does NOT pass the validation check carried out by the firmware.
  
  @retval EFI_NOT_FOUND          The variable trying to be updated or deleted was not found.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_SET_VARIABLE)(
  IN  CHAR16                       *VariableName,
  IN  EFI_GUID                     *VendorGuid,
  IN  UINT32                       Attributes,
  IN  UINTN                        DataSize,
  IN  VOID                         *Data
  );


///
/// This provides the capabilities of the
/// real time clock device as exposed through the EFI interfaces.
///
typedef struct {
  ///
  /// Provides the reporting resolution of the real-time clock device in
  /// counts per second. For a normal PC-AT CMOS RTC device, this
  /// value would be 1 Hz, or 1, to indicate that the device only reports
  /// the time to the resolution of 1 second.
  ///
  UINT32    Resolution;
  ///
  /// Provides the timekeeping accuracy of the real-time clock in an
  /// error rate of 1E-6 parts per million. For a clock with an accuracy
  /// of 50 parts per million, the value in this field would be
  /// 50,000,000.
  ///
  UINT32    Accuracy;
  ///
  /// A TRUE indicates that a time set operation clears the device's
  /// time below the Resolution reporting level. A FALSE
  /// indicates that the state below the Resolution level of the
  /// device is not cleared when the time is set. Normal PC-AT CMOS
  /// RTC devices set this value to FALSE.
  ///
  BOOLEAN   SetsToZero;
} EFI_TIME_CAPABILITIES;

/**
  Returns the current time and date information, and the time-keeping capabilities
  of the hardware platform.

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

  @retval EFI_SUCCESS           The operation completed successfully.
  @retval EFI_INVALID_PARAMETER Time is NULL.
  @retval EFI_DEVICE_ERROR      The time could not be retrieved due to hardware error.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_GET_TIME)(
  OUT  EFI_TIME                    *Time,
  OUT  EFI_TIME_CAPABILITIES       *Capabilities OPTIONAL
  );

/**
  Sets the current local time and date information.

  @param[in]  Time              A pointer to the current time.

  @retval EFI_SUCCESS           The operation completed successfully.
  @retval EFI_INVALID_PARAMETER A time field is out of range.
  @retval EFI_DEVICE_ERROR      The time could not be set due due to hardware error.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_SET_TIME)(
  IN  EFI_TIME                     *Time
  );

/**
  Returns the current wakeup alarm clock setting.

  @param[out]  Enabled          Indicates if the alarm is currently enabled or disabled.
  @param[out]  Pending          Indicates if the alarm signal is pending and requires acknowledgement.
  @param[out]  Time             The current alarm setting.

  @retval EFI_SUCCESS           The alarm settings were returned.
  @retval EFI_INVALID_PARAMETER Enabled is NULL.
  @retval EFI_INVALID_PARAMETER Pending is NULL.
  @retval EFI_INVALID_PARAMETER Time is NULL.
  @retval EFI_DEVICE_ERROR      The wakeup time could not be retrieved due to a hardware error.
  @retval EFI_UNSUPPORTED       A wakeup timer is not supported on this platform.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_GET_WAKEUP_TIME)(
  OUT BOOLEAN                     *Enabled,
  OUT BOOLEAN                     *Pending,
  OUT EFI_TIME                    *Time
  );

/**
  Sets the system wakeup alarm clock time.

  @param[in]  Enable            Enable or disable the wakeup alarm.
  @param[in]  Time              If Enable is TRUE, the time to set the wakeup alarm for.
                                If Enable is FALSE, then this parameter is optional, and may be NULL.

  @retval EFI_SUCCESS           If Enable is TRUE, then the wakeup alarm was enabled. If
                                Enable is FALSE, then the wakeup alarm was disabled.
  @retval EFI_INVALID_PARAMETER A time field is out of range.
  @retval EFI_DEVICE_ERROR      The wakeup time could not be set due to a hardware error.
  @retval EFI_UNSUPPORTED       A wakeup timer is not supported on this platform.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_SET_WAKEUP_TIME)(
  IN  BOOLEAN                      Enable,
  IN  EFI_TIME                     *Time   OPTIONAL
  );

/**
  Loads an EFI image into memory.

  @param[in]   BootPolicy        If TRUE, indicates that the request originates from the boot
                                 manager, and that the boot manager is attempting to load
                                 FilePath as a boot selection. Ignored if SourceBuffer is
                                 not NULL.
  @param[in]   ParentImageHandle The caller's image handle.
  @param[in]   DevicePath        The DeviceHandle specific file path from which the image is
                                 loaded.
  @param[in]   SourceBuffer      If not NULL, a pointer to the memory location containing a copy
                                 of the image to be loaded.
  @param[in]   SourceSize        The size in bytes of SourceBuffer. Ignored if SourceBuffer is NULL.
  @param[out]  ImageHandle       The pointer to the returned image handle that is created when the
                                 image is successfully loaded.

  @retval EFI_SUCCESS            Image was loaded into memory correctly.
  @retval EFI_NOT_FOUND          Both SourceBuffer and DevicePath are NULL.
  @retval EFI_INVALID_PARAMETER  One or more parametes are invalid.
  @retval EFI_UNSUPPORTED        The image type is not supported.
  @retval EFI_OUT_OF_RESOURCES   Image was not loaded due to insufficient resources.
  @retval EFI_LOAD_ERROR         Image was not loaded because the image format was corrupt or not
                                 understood.
  @retval EFI_DEVICE_ERROR       Image was not loaded because the device returned a read error.
  @retval EFI_ACCESS_DENIED      Image was not loaded because the platform policy prohibits the 
                                 image from being loaded. NULL is returned in *ImageHandle.
  @retval EFI_SECURITY_VIOLATION Image was loaded and an ImageHandle was created with a 
                                 valid EFI_LOADED_IMAGE_PROTOCOL. However, the current 
                                 platform policy specifies that the image should not be started.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_IMAGE_LOAD)(
  IN  BOOLEAN                      BootPolicy,
  IN  EFI_HANDLE                   ParentImageHandle,
  IN  EFI_DEVICE_PATH_PROTOCOL     *DevicePath,
  IN  VOID                         *SourceBuffer OPTIONAL,
  IN  UINTN                        SourceSize,
  OUT EFI_HANDLE                   *ImageHandle
  );

/**
  Transfers control to a loaded image's entry point.

  @param[in]   ImageHandle       Handle of image to be started.
  @param[out]  ExitDataSize      The pointer to the size, in bytes, of ExitData.
  @param[out]  ExitData          The pointer to a pointer to a data buffer that includes a Null-terminated
                                 string, optionally followed by additional binary data.

  @retval EFI_INVALID_PARAMETER  ImageHandle is either an invalid image handle or the image
                                 has already been initialized with StartImage.
  @retval EFI_SECURITY_VIOLATION The current platform policy specifies that the image should not be started.
  @return Exit code from image

**/
typedef
EFI_STATUS
(EFIAPI *EFI_IMAGE_START)(
  IN  EFI_HANDLE                  ImageHandle,
  OUT UINTN                       *ExitDataSize,
  OUT CHAR16                      **ExitData    OPTIONAL
  );

/**
  Terminates a loaded EFI image and returns control to boot services.

  @param[in]  ImageHandle       Handle that identifies the image. This parameter is passed to the 
                                image on entry.
  @param[in]  ExitStatus        The image's exit code.
  @param[in]  ExitDataSize      The size, in bytes, of ExitData. Ignored if ExitStatus is EFI_SUCCESS.
  @param[in]  ExitData          The pointer to a data buffer that includes a Null-terminated string,
                                optionally followed by additional binary data. The string is a 
                                description that the caller may use to further indicate the reason 
                                for the image's exit. ExitData is only valid if ExitStatus 
                                is something other than EFI_SUCCESS. The ExitData buffer 
                                must be allocated by calling AllocatePool().

  @retval EFI_SUCCESS           The image specified by ImageHandle was unloaded.
  @retval EFI_INVALID_PARAMETER The image specified by ImageHandle has been loaded and
                                started with LoadImage() and StartImage(), but the
                                image is not the currently executing image.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_EXIT)(
  IN  EFI_HANDLE                   ImageHandle,
  IN  EFI_STATUS                   ExitStatus,
  IN  UINTN                        ExitDataSize,
  IN  CHAR16                       *ExitData     OPTIONAL
  );

/**
  Unloads an image.

  @param[in]  ImageHandle       Handle that identifies the image to be unloaded.

  @retval EFI_SUCCESS           The image has been unloaded.
  @retval EFI_INVALID_PARAMETER ImageHandle is not a valid image handle.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_IMAGE_UNLOAD)(
  IN  EFI_HANDLE                   ImageHandle
  );

/**
  Terminates all boot services.

  @param[in]  ImageHandle       Handle that identifies the exiting image.
  @param[in]  MapKey            Key to the latest memory map.

  @retval EFI_SUCCESS           Boot services have been terminated.
  @retval EFI_INVALID_PARAMETER MapKey is incorrect.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_EXIT_BOOT_SERVICES)(
  IN  EFI_HANDLE                   ImageHandle,
  IN  UINTN                        MapKey
  );

/**
  Induces a fine-grained stall.

  @param[in]  Microseconds      The number of microseconds to stall execution.

  @retval EFI_SUCCESS           Execution was stalled at least the requested number of
                                Microseconds.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_STALL)(
  IN  UINTN                    Microseconds
  );

/**
  Sets the system's watchdog timer.

  @param[in]  Timeout           The number of seconds to set the watchdog timer to.
  @param[in]  WatchdogCode      The numeric code to log on a watchdog timer timeout event.
  @param[in]  DataSize          The size, in bytes, of WatchdogData.
  @param[in]  WatchdogData      A data buffer that includes a Null-terminated string, optionally
                                followed by additional binary data.

  @retval EFI_SUCCESS           The timeout has been set.
  @retval EFI_INVALID_PARAMETER The supplied WatchdogCode is invalid.
  @retval EFI_UNSUPPORTED       The system does not have a watchdog timer.
  @retval EFI_DEVICE_ERROR      The watchdog timer could not be programmed due to a hardware
                                error.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_SET_WATCHDOG_TIMER)(
  IN UINTN                    Timeout,
  IN UINT64                   WatchdogCode,
  IN UINTN                    DataSize,
  IN CHAR16                   *WatchdogData OPTIONAL
  );

/**
  Resets the entire platform.

  @param[in]  ResetType         The type of reset to perform.
  @param[in]  ResetStatus       The status code for the reset.
  @param[in]  DataSize          The size, in bytes, of WatchdogData.
  @param[in]  ResetData         For a ResetType of EfiResetCold, EfiResetWarm, or
                                EfiResetShutdown the data buffer starts with a Null-terminated
                                string, optionally followed by additional binary data.

**/
typedef
VOID
(EFIAPI *EFI_RESET_SYSTEM)(
  IN EFI_RESET_TYPE           ResetType,
  IN EFI_STATUS               ResetStatus,
  IN UINTN                    DataSize,
  IN VOID                     *ResetData OPTIONAL
  );

/**
  Returns a monotonically increasing count for the platform.

  @param[out]  Count            The pointer to returned value.

  @retval EFI_SUCCESS           The next monotonic count was returned.
  @retval EFI_INVALID_PARAMETER Count is NULL.
  @retval EFI_DEVICE_ERROR      The device is not functioning properly.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_GET_NEXT_MONOTONIC_COUNT)(
  OUT UINT64                  *Count
  );

/**
  Returns the next high 32 bits of the platform's monotonic counter.

  @param[out]  HighCount        The pointer to returned value.

  @retval EFI_SUCCESS           The next high monotonic count was returned.
  @retval EFI_INVALID_PARAMETER HighCount is NULL.
  @retval EFI_DEVICE_ERROR      The device is not functioning properly.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_GET_NEXT_HIGH_MONO_COUNT)(
  OUT UINT32                  *HighCount
  );

/**
  Computes and returns a 32-bit CRC for a data buffer.

  @param[in]   Data             A pointer to the buffer on which the 32-bit CRC is to be computed.
  @param[in]   DataSize         The number of bytes in the buffer Data.
  @param[out]  Crc32            The 32-bit CRC that was computed for the data buffer specified by Data
                                and DataSize.

  @retval EFI_SUCCESS           The 32-bit CRC was computed for the data buffer and returned in
                                Crc32.
  @retval EFI_INVALID_PARAMETER Data is NULL.
  @retval EFI_INVALID_PARAMETER Crc32 is NULL.
  @retval EFI_INVALID_PARAMETER DataSize is 0.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_CALCULATE_CRC32)(
  IN  VOID                              *Data,
  IN  UINTN                             DataSize,
  OUT UINT32                            *Crc32
  );

/**
  Copies the contents of one buffer to another buffer.

  @param[in]  Destination       The pointer to the destination buffer of the memory copy.
  @param[in]  Source            The pointer to the source buffer of the memory copy.
  @param[in]  Length            Number of bytes to copy from Source to Destination.

**/
typedef
VOID
(EFIAPI *EFI_COPY_MEM)(
  IN VOID     *Destination,
  IN VOID     *Source,
  IN UINTN    Length
  );

/**
  The SetMem() function fills a buffer with a specified value.

  @param[in]  Buffer            The pointer to the buffer to fill.
  @param[in]  Size              Number of bytes in Buffer to fill.
  @param[in]  Value             Value to fill Buffer with.

**/
typedef
VOID
(EFIAPI *EFI_SET_MEM)(
  IN VOID     *Buffer,
  IN UINTN    Size,
  IN UINT8    Value
  );

///
/// Enumeration of EFI Interface Types
///
typedef enum {
  ///
  /// Indicates that the supplied protocol interface is supplied in native form.
  ///
  EFI_NATIVE_INTERFACE
} EFI_INTERFACE_TYPE;

/**
  Installs a protocol interface on a device handle. If the handle does not exist, it is created and added
  to the list of handles in the system. InstallMultipleProtocolInterfaces() performs
  more error checking than InstallProtocolInterface(), so it is recommended that
  InstallMultipleProtocolInterfaces() be used in place of
  InstallProtocolInterface()

  @param[in, out]  Handle         A pointer to the EFI_HANDLE on which the interface is to be installed.
  @param[in]       Protocol       The numeric ID of the protocol interface.
  @param[in]       InterfaceType  Indicates whether Interface is supplied in native form.
  @param[in]       Interface      A pointer to the protocol interface.

  @retval EFI_SUCCESS           The protocol interface was installed.
  @retval EFI_OUT_OF_RESOURCES  Space for a new handle could not be allocated.
  @retval EFI_INVALID_PARAMETER Handle is NULL.
  @retval EFI_INVALID_PARAMETER Protocol is NULL.
  @retval EFI_INVALID_PARAMETER InterfaceType is not EFI_NATIVE_INTERFACE.
  @retval EFI_INVALID_PARAMETER Protocol is already installed on the handle specified by Handle.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_INSTALL_PROTOCOL_INTERFACE)(
  IN OUT EFI_HANDLE               *Handle,
  IN     EFI_GUID                 *Protocol,
  IN     EFI_INTERFACE_TYPE       InterfaceType,
  IN     VOID                     *Interface
  );

/**
  Installs one or more protocol interfaces into the boot services environment.

  @param[in, out]  Handle       The pointer to a handle to install the new protocol interfaces on,
                                or a pointer to NULL if a new handle is to be allocated.
  @param  ...                   A variable argument list containing pairs of protocol GUIDs and protocol
                                interfaces.

  @retval EFI_SUCCESS           All the protocol interface was installed.
  @retval EFI_OUT_OF_RESOURCES  There was not enough memory in pool to install all the protocols.
  @retval EFI_ALREADY_STARTED   A Device Path Protocol instance was passed in that is already present in
                                the handle database.
  @retval EFI_INVALID_PARAMETER Handle is NULL.
  @retval EFI_INVALID_PARAMETER Protocol is already installed on the handle specified by Handle.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_INSTALL_MULTIPLE_PROTOCOL_INTERFACES)(
  IN OUT EFI_HANDLE           *Handle,
  ...
  );

/**
  Reinstalls a protocol interface on a device handle.

  @param[in]  Handle            Handle on which the interface is to be reinstalled.
  @param[in]  Protocol          The numeric ID of the interface.
  @param[in]  OldInterface      A pointer to the old interface. NULL can be used if a structure is not
                                associated with Protocol.
  @param[in]  NewInterface      A pointer to the new interface.

  @retval EFI_SUCCESS           The protocol interface was reinstalled.
  @retval EFI_NOT_FOUND         The OldInterface on the handle was not found.
  @retval EFI_ACCESS_DENIED     The protocol interface could not be reinstalled,
                                because OldInterface is still being used by a
                                driver that will not release it.
  @retval EFI_INVALID_PARAMETER Handle is NULL.
  @retval EFI_INVALID_PARAMETER Protocol is NULL.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_REINSTALL_PROTOCOL_INTERFACE)(
  IN EFI_HANDLE               Handle,
  IN EFI_GUID                 *Protocol,
  IN VOID                     *OldInterface,
  IN VOID                     *NewInterface
  );

/**
  Removes a protocol interface from a device handle. It is recommended that
  UninstallMultipleProtocolInterfaces() be used in place of
  UninstallProtocolInterface().

  @param[in]  Handle            The handle on which the interface was installed.
  @param[in]  Protocol          The numeric ID of the interface.
  @param[in]  Interface         A pointer to the interface.

  @retval EFI_SUCCESS           The interface was removed.
  @retval EFI_NOT_FOUND         The interface was not found.
  @retval EFI_ACCESS_DENIED     The interface was not removed because the interface
                                is still being used by a driver.
  @retval EFI_INVALID_PARAMETER Handle is NULL.
  @retval EFI_INVALID_PARAMETER Protocol is NULL.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_UNINSTALL_PROTOCOL_INTERFACE)(
  IN EFI_HANDLE               Handle,
  IN EFI_GUID                 *Protocol,
  IN VOID                     *Interface
  );

/**
  Removes one or more protocol interfaces into the boot services environment.

  @param[in]  Handle            The handle to remove the protocol interfaces from.
  @param  ...                   A variable argument list containing pairs of protocol GUIDs and
                                protocol interfaces.

  @retval EFI_SUCCESS           All the protocol interfaces were removed.
  @retval EFI_INVALID_PARAMETER One of the protocol interfaces was not previously installed on Handle.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_UNINSTALL_MULTIPLE_PROTOCOL_INTERFACES)(
  IN EFI_HANDLE           Handle,
  ...
  );

/**
  Queries a handle to determine if it supports a specified protocol.

  @param[in]   Handle           The handle being queried.
  @param[in]   Protocol         The published unique identifier of the protocol.
  @param[out]  Interface        Supplies the address where a pointer to the corresponding Protocol
                                Interface is returned.

  @retval EFI_SUCCESS           The interface information for the specified protocol was returned.
  @retval EFI_UNSUPPORTED       The device does not support the specified protocol.
  @retval EFI_INVALID_PARAMETER Handle is NULL.
  @retval EFI_INVALID_PARAMETER Protocol is NULL.
  @retval EFI_INVALID_PARAMETER Interface is NULL.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_HANDLE_PROTOCOL)(
  IN  EFI_HANDLE               Handle,
  IN  EFI_GUID                 *Protocol,
  OUT VOID                     **Interface
  );

#define EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL  0x00000001
#define EFI_OPEN_PROTOCOL_GET_PROTOCOL        0x00000002
#define EFI_OPEN_PROTOCOL_TEST_PROTOCOL       0x00000004
#define EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER 0x00000008
#define EFI_OPEN_PROTOCOL_BY_DRIVER           0x00000010
#define EFI_OPEN_PROTOCOL_EXCLUSIVE           0x00000020

/**
  Queries a handle to determine if it supports a specified protocol. If the protocol is supported by the
  handle, it opens the protocol on behalf of the calling agent.

  @param[in]   Handle           The handle for the protocol interface that is being opened.
  @param[in]   Protocol         The published unique identifier of the protocol.
  @param[out]  Interface        Supplies the address where a pointer to the corresponding Protocol
                                Interface is returned.
  @param[in]   AgentHandle      The handle of the agent that is opening the protocol interface
                                specified by Protocol and Interface.
  @param[in]   ControllerHandle If the agent that is opening a protocol is a driver that follows the
                                UEFI Driver Model, then this parameter is the controller handle
                                that requires the protocol interface. If the agent does not follow
                                the UEFI Driver Model, then this parameter is optional and may
                                be NULL.
  @param[in]   Attributes       The open mode of the protocol interface specified by Handle
                                and Protocol.

  @retval EFI_SUCCESS           An item was added to the open list for the protocol interface, and the
                                protocol interface was returned in Interface.
  @retval EFI_UNSUPPORTED       Handle does not support Protocol.
  @retval EFI_INVALID_PARAMETER One or more parameters are invalid.
  @retval EFI_ACCESS_DENIED     Required attributes can't be supported in current environment.
  @retval EFI_ALREADY_STARTED   Item on the open list already has requierd attributes whose agent
                                handle is the same as AgentHandle.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_OPEN_PROTOCOL)(
  IN  EFI_HANDLE                Handle,
  IN  EFI_GUID                  *Protocol,
  OUT VOID                      **Interface, OPTIONAL
  IN  EFI_HANDLE                AgentHandle,
  IN  EFI_HANDLE                ControllerHandle,
  IN  UINT32                    Attributes
  );


/**
  Closes a protocol on a handle that was opened using OpenProtocol().

  @param[in]  Handle            The handle for the protocol interface that was previously opened
                                with OpenProtocol(), and is now being closed.
  @param[in]  Protocol          The published unique identifier of the protocol.
  @param[in]  AgentHandle       The handle of the agent that is closing the protocol interface.
  @param[in]  ControllerHandle  If the agent that opened a protocol is a driver that follows the
                                UEFI Driver Model, then this parameter is the controller handle
                                that required the protocol interface.

  @retval EFI_SUCCESS           The protocol instance was closed.
  @retval EFI_INVALID_PARAMETER 1) Handle is NULL.
                                2) AgentHandle is NULL.
                                3) ControllerHandle is not NULL and ControllerHandle is not a valid EFI_HANDLE.
                                4) Protocol is NULL.
  @retval EFI_NOT_FOUND         1) Handle does not support the protocol specified by Protocol.
                                2) The protocol interface specified by Handle and Protocol is not
                                   currently open by AgentHandle and ControllerHandle.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_CLOSE_PROTOCOL)(
  IN EFI_HANDLE               Handle,
  IN EFI_GUID                 *Protocol,
  IN EFI_HANDLE               AgentHandle,
  IN EFI_HANDLE               ControllerHandle
  );

///
/// EFI Oprn Protocol Information Entry
///
typedef struct {
  EFI_HANDLE  AgentHandle;
  EFI_HANDLE  ControllerHandle;
  UINT32      Attributes;
  UINT32      OpenCount;
} EFI_OPEN_PROTOCOL_INFORMATION_ENTRY;

/**
  Retrieves the list of agents that currently have a protocol interface opened.

  @param[in]   Handle           The handle for the protocol interface that is being queried.
  @param[in]   Protocol         The published unique identifier of the protocol.
  @param[out]  EntryBuffer      A pointer to a buffer of open protocol information in the form of
                                EFI_OPEN_PROTOCOL_INFORMATION_ENTRY structures.
  @param[out]  EntryCount       A pointer to the number of entries in EntryBuffer.

  @retval EFI_SUCCESS           The open protocol information was returned in EntryBuffer, and the
                                number of entries was returned EntryCount.
  @retval EFI_OUT_OF_RESOURCES  There are not enough resources available to allocate EntryBuffer.
  @retval EFI_NOT_FOUND         Handle does not support the protocol specified by Protocol.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_OPEN_PROTOCOL_INFORMATION)(
  IN  EFI_HANDLE                          Handle,
  IN  EFI_GUID                            *Protocol,
  OUT EFI_OPEN_PROTOCOL_INFORMATION_ENTRY **EntryBuffer,
  OUT UINTN                               *EntryCount
  );

/**
  Retrieves the list of protocol interface GUIDs that are installed on a handle in a buffer allocated
  from pool.

  @param[in]   Handle              The handle from which to retrieve the list of protocol interface
                                   GUIDs.
  @param[out]  ProtocolBuffer      A pointer to the list of protocol interface GUID pointers that are
                                   installed on Handle.
  @param[out]  ProtocolBufferCount A pointer to the number of GUID pointers present in
                                   ProtocolBuffer.

  @retval EFI_SUCCESS           The list of protocol interface GUIDs installed on Handle was returned in
                                ProtocolBuffer. The number of protocol interface GUIDs was
                                returned in ProtocolBufferCount.
  @retval EFI_OUT_OF_RESOURCES  There is not enough pool memory to store the results.
  @retval EFI_INVALID_PARAMETER Handle is NULL.
  @retval EFI_INVALID_PARAMETER Handle is not a valid EFI_HANDLE.
  @retval EFI_INVALID_PARAMETER ProtocolBuffer is NULL.
  @retval EFI_INVALID_PARAMETER ProtocolBufferCount is NULL.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_PROTOCOLS_PER_HANDLE)(
  IN  EFI_HANDLE      Handle,
  OUT EFI_GUID        ***ProtocolBuffer,
  OUT UINTN           *ProtocolBufferCount
  );

/**
  Creates an event that is to be signaled whenever an interface is installed for a specified protocol.

  @param[in]   Protocol         The numeric ID of the protocol for which the event is to be registered.
  @param[in]   Event            Event that is to be signaled whenever a protocol interface is registered
                                for Protocol.
  @param[out]  Registration     A pointer to a memory location to receive the registration value.

  @retval EFI_SUCCESS           The notification event has been registered.
  @retval EFI_OUT_OF_RESOURCES  Space for the notification event could not be allocated.
  @retval EFI_INVALID_PARAMETER Protocol is NULL.
  @retval EFI_INVALID_PARAMETER Event is NULL.
  @retval EFI_INVALID_PARAMETER Registration is NULL.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_REGISTER_PROTOCOL_NOTIFY)(
  IN  EFI_GUID                 *Protocol,
  IN  EFI_EVENT                Event,
  OUT VOID                     **Registration
  );

///
/// Enumeration of EFI Locate Search Types
///
typedef enum {
  ///
  /// Retrieve all the handles in the handle database.
  ///
  AllHandles,
  ///
  /// Retrieve the next handle fron a RegisterProtocolNotify() event.
  ///
  ByRegisterNotify,
  ///
  /// Retrieve the set of handles from the handle database that support a 
  /// specified protocol.
  ///
  ByProtocol
} EFI_LOCATE_SEARCH_TYPE;

/**
  Returns an array of handles that support a specified protocol.

  @param[in]       SearchType   Specifies which handle(s) are to be returned.
  @param[in]       Protocol     Specifies the protocol to search by.
  @param[in]       SearchKey    Specifies the search key.
  @param[in, out]  BufferSize   On input, the size in bytes of Buffer. On output, the size in bytes of
                                the array returned in Buffer (if the buffer was large enough) or the
                                size, in bytes, of the buffer needed to obtain the array (if the buffer was
                                not large enough).
  @param[out]      Buffer       The buffer in which the array is returned.

  @retval EFI_SUCCESS           The array of handles was returned.
  @retval EFI_NOT_FOUND         No handles match the search.
  @retval EFI_BUFFER_TOO_SMALL  The BufferSize is too small for the result.
  @retval EFI_INVALID_PARAMETER SearchType is not a member of EFI_LOCATE_SEARCH_TYPE.
  @retval EFI_INVALID_PARAMETER SearchType is ByRegisterNotify and SearchKey is NULL.
  @retval EFI_INVALID_PARAMETER SearchType is ByProtocol and Protocol is NULL.
  @retval EFI_INVALID_PARAMETER One or more matches are found and BufferSize is NULL.
  @retval EFI_INVALID_PARAMETER BufferSize is large enough for the result and Buffer is NULL.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_LOCATE_HANDLE)(
  IN     EFI_LOCATE_SEARCH_TYPE   SearchType,
  IN     EFI_GUID                 *Protocol,    OPTIONAL
  IN     VOID                     *SearchKey,   OPTIONAL
  IN OUT UINTN                    *BufferSize,
  OUT    EFI_HANDLE               *Buffer
  );

/**
  Locates the handle to a device on the device path that supports the specified protocol.

  @param[in]       Protocol     Specifies the protocol to search for.
  @param[in, out]  DevicePath   On input, a pointer to a pointer to the device path. On output, the device
                                path pointer is modified to point to the remaining part of the device
                                path.
  @param[out]      Device       A pointer to the returned device handle.

  @retval EFI_SUCCESS           The resulting handle was returned.
  @retval EFI_NOT_FOUND         No handles match the search.
  @retval EFI_INVALID_PARAMETER Protocol is NULL.
  @retval EFI_INVALID_PARAMETER DevicePath is NULL.
  @retval EFI_INVALID_PARAMETER A handle matched the search and Device is NULL.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_LOCATE_DEVICE_PATH)(
  IN     EFI_GUID                         *Protocol,
  IN OUT EFI_DEVICE_PATH_PROTOCOL         **DevicePath,
  OUT    EFI_HANDLE                       *Device
  );

/**
  Adds, updates, or removes a configuration table entry from the EFI System Table.

  @param[in]  Guid              A pointer to the GUID for the entry to add, update, or remove.
  @param[in]  Table             A pointer to the configuration table for the entry to add, update, or
                                remove. May be NULL.

  @retval EFI_SUCCESS           The (Guid, Table) pair was added, updated, or removed.
  @retval EFI_NOT_FOUND         An attempt was made to delete a nonexistent entry.
  @retval EFI_INVALID_PARAMETER Guid is NULL.
  @retval EFI_OUT_OF_RESOURCES  There is not enough memory available to complete the operation.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_INSTALL_CONFIGURATION_TABLE)(
  IN EFI_GUID                 *Guid,
  IN VOID                     *Table
  );

/**
  Returns an array of handles that support the requested protocol in a buffer allocated from pool.

  @param[in]       SearchType   Specifies which handle(s) are to be returned.
  @param[in]       Protocol     Provides the protocol to search by.
                                This parameter is only valid for a SearchType of ByProtocol.
  @param[in]       SearchKey    Supplies the search key depending on the SearchType.
  @param[in, out]  NoHandles    The number of handles returned in Buffer.
  @param[out]      Buffer       A pointer to the buffer to return the requested array of handles that
                                support Protocol.

  @retval EFI_SUCCESS           The array of handles was returned in Buffer, and the number of
                                handles in Buffer was returned in NoHandles.
  @retval EFI_NOT_FOUND         No handles match the search.
  @retval EFI_OUT_OF_RESOURCES  There is not enough pool memory to store the matching results.
  @retval EFI_INVALID_PARAMETER NoHandles is NULL.
  @retval EFI_INVALID_PARAMETER Buffer is NULL.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_LOCATE_HANDLE_BUFFER)(
  IN     EFI_LOCATE_SEARCH_TYPE       SearchType,
  IN     EFI_GUID                     *Protocol,      OPTIONAL
  IN     VOID                         *SearchKey,     OPTIONAL
  IN OUT UINTN                        *NoHandles,
  OUT    EFI_HANDLE                   **Buffer
  );

/**
  Returns the first protocol instance that matches the given protocol.

  @param[in]  Protocol          Provides the protocol to search for.
  @param[in]  Registration      Optional registration key returned from
                                RegisterProtocolNotify().
  @param[out]  Interface        On return, a pointer to the first interface that matches Protocol and
                                Registration.

  @retval EFI_SUCCESS           A protocol instance matching Protocol was found and returned in
                                Interface.
  @retval EFI_NOT_FOUND         No protocol instances were found that match Protocol and
                                Registration.
  @retval EFI_INVALID_PARAMETER Interface is NULL.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_LOCATE_PROTOCOL)(
  IN  EFI_GUID  *Protocol,
  IN  VOID      *Registration, OPTIONAL
  OUT VOID      **Interface
  );

///
/// EFI Capsule Block Descriptor
///
typedef struct {
  ///
  /// Length in bytes of the data pointed to by DataBlock/ContinuationPointer.
  ///
  UINT64                  Length;
  union {
    ///
    /// Physical address of the data block. This member of the union is
    /// used if Length is not equal to zero.
    ///
    EFI_PHYSICAL_ADDRESS  DataBlock;
    ///
    /// Physical address of another block of
    /// EFI_CAPSULE_BLOCK_DESCRIPTOR structures. This
    /// member of the union is used if Length is equal to zero. If
    /// ContinuationPointer is zero this entry represents the end of the list.
    ///
    EFI_PHYSICAL_ADDRESS  ContinuationPointer;
  } Union;
} EFI_CAPSULE_BLOCK_DESCRIPTOR;

///
/// EFI Capsule Header.
///
typedef struct {
  ///
  /// A GUID that defines the contents of a capsule.
  ///
  EFI_GUID          CapsuleGuid;
  ///
  /// The size of the capsule header. This may be larger than the size of
  /// the EFI_CAPSULE_HEADER since CapsuleGuid may imply
  /// extended header entries
  ///
  UINT32            HeaderSize;
  ///
  /// Bit-mapped list describing the capsule attributes. The Flag values
  /// of 0x0000 - 0xFFFF are defined by CapsuleGuid. Flag values
  /// of 0x10000 - 0xFFFFFFFF are defined by this specification
  ///
  UINT32            Flags;
  ///
  /// Size in bytes of the capsule.
  ///
  UINT32            CapsuleImageSize;
} EFI_CAPSULE_HEADER;

///
/// The EFI System Table entry must point to an array of capsules
/// that contain the same CapsuleGuid value. The array must be
/// prefixed by a UINT32 that represents the size of the array of capsules.
///
typedef struct {
  ///
  /// the size of the array of capsules.
  ///
  UINT32   CapsuleArrayNumber;
  ///
  /// Point to an array of capsules that contain the same CapsuleGuid value.
  ///
  VOID*    CapsulePtr[1];
} EFI_CAPSULE_TABLE;

#define CAPSULE_FLAGS_PERSIST_ACROSS_RESET          0x00010000
#define CAPSULE_FLAGS_POPULATE_SYSTEM_TABLE         0x00020000
#define CAPSULE_FLAGS_INITIATE_RESET                0x00040000

/**
  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.

  @param[in]  CapsuleHeaderArray Virtual pointer to an array of virtual pointers to the capsules
                                 being passed into update capsule.
  @param[in]  CapsuleCount       Number of pointers to EFI_CAPSULE_HEADER in
                                 CaspuleHeaderArray.
  @param[in]  ScatterGatherList  Physical pointer to a set of
                                 EFI_CAPSULE_BLOCK_DESCRIPTOR that describes the
                                 location in physical memory of a set of capsules.

  @retval EFI_SUCCESS           Valid capsule was passed. If
                                CAPSULE_FLAGS_PERSIT_ACROSS_RESET is not set, the
                                capsule has been successfully processed by the firmware.
  @retval EFI_INVALID_PARAMETER CapsuleSize is NULL, or an incompatible set of flags were
                                set in the capsule header.
  @retval EFI_INVALID_PARAMETER CapsuleCount is 0.
  @retval EFI_DEVICE_ERROR      The capsule update was started, but failed due to a device error.
  @retval EFI_UNSUPPORTED       The capsule type is not supported on this platform.
  @retval EFI_OUT_OF_RESOURCES  When ExitBootServices() has been previously called this error indicates the capsule 
                                is compatible with this platform but is not capable of being submitted or processed 
                                in runtime. The caller may resubmit the capsule prior to ExitBootServices().
  @retval EFI_OUT_OF_RESOURCES  When ExitBootServices() has not been previously called then this error indicates 
                                the capsule is compatible with this platform but there are insufficient resources to process.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_UPDATE_CAPSULE)(
  IN EFI_CAPSULE_HEADER     **CapsuleHeaderArray,
  IN UINTN                  CapsuleCount,
  IN EFI_PHYSICAL_ADDRESS   ScatterGatherList   OPTIONAL
  );

/**
  Returns if the capsule can be supported via UpdateCapsule().

  @param[in]   CapsuleHeaderArray  Virtual pointer to an array of virtual pointers to the capsules
                                   being passed into update capsule.
  @param[in]   CapsuleCount        Number of pointers to EFI_CAPSULE_HEADER in
                                   CaspuleHeaderArray.
  @param[out]  MaxiumCapsuleSize   On output the maximum size that UpdateCapsule() can
                                   support as an argument to UpdateCapsule() via
                                   CapsuleHeaderArray and ScatterGatherList.
  @param[out]  ResetType           Returns the type of reset required for the capsule update.

  @retval EFI_SUCCESS           Valid answer returned.
  @retval EFI_UNSUPPORTED       The capsule type is not supported on this platform, and
                                MaximumCapsuleSize and ResetType are undefined.
  @retval EFI_INVALID_PARAMETER MaximumCapsuleSize is NULL.
  @retval EFI_OUT_OF_RESOURCES  When ExitBootServices() has been previously called this error indicates the capsule 
                                is compatible with this platform but is not capable of being submitted or processed 
                                in runtime. The caller may resubmit the capsule prior to ExitBootServices().
  @retval EFI_OUT_OF_RESOURCES  When ExitBootServices() has not been previously called then this error indicates 
                                the capsule is compatible with this platform but there are insufficient resources to process.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_QUERY_CAPSULE_CAPABILITIES)(
  IN  EFI_CAPSULE_HEADER     **CapsuleHeaderArray,
  IN  UINTN                  CapsuleCount,
  OUT UINT64                 *MaximumCapsuleSize,
  OUT EFI_RESET_TYPE         *ResetType
  );

/**
  Returns information about the EFI variables.

  @param[in]   Attributes                   Attributes bitmask to specify the type of variables on
                                            which to return information.
  @param[out]  MaximumVariableStorageSize   On output the maximum size of the storage space
                                            available for the EFI variables associated with the
                                            attributes specified.
  @param[out]  RemainingVariableStorageSize Returns the remaining size of the storage space
                                            available for the EFI variables associated with the
                                            attributes specified.
  @param[out]  MaximumVariableSize          Returns the maximum size of the individual EFI
                                            variables associated with the attributes specified.

  @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.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_QUERY_VARIABLE_INFO)(
  IN  UINT32            Attributes,
  OUT UINT64            *MaximumVariableStorageSize,
  OUT UINT64            *RemainingVariableStorageSize,
  OUT UINT64            *MaximumVariableSize
  );

//
// Firmware should stop at a firmware user interface on next boot
//
#define EFI_OS_INDICATIONS_BOOT_TO_FW_UI                    0x0000000000000001
#define EFI_OS_INDICATIONS_TIMESTAMP_REVOCATION             0x0000000000000002
#define EFI_OS_INDICATIONS_FILE_CAPSULE_DELIVERY_SUPPORTED  0x0000000000000004
#define EFI_OS_INDICATIONS_FMP_CAPSULE_SUPPORTED            0x0000000000000008
#define EFI_OS_INDICATIONS_CAPSULE_RESULT_VAR_SUPPORTED     0x0000000000000010

//
// EFI Runtime Services Table
//
#define EFI_SYSTEM_TABLE_SIGNATURE      SIGNATURE_64 ('I','B','I',' ','S','Y','S','T')
#define EFI_2_50_SYSTEM_TABLE_REVISION  ((2 << 16) | (50))
#define EFI_2_40_SYSTEM_TABLE_REVISION  ((2 << 16) | (40))
#define EFI_2_31_SYSTEM_TABLE_REVISION  ((2 << 16) | (31))
#define EFI_2_30_SYSTEM_TABLE_REVISION  ((2 << 16) | (30))
#define EFI_2_20_SYSTEM_TABLE_REVISION  ((2 << 16) | (20))
#define EFI_2_10_SYSTEM_TABLE_REVISION  ((2 << 16) | (10))
#define EFI_2_00_SYSTEM_TABLE_REVISION  ((2 << 16) | (00))
#define EFI_1_10_SYSTEM_TABLE_REVISION  ((1 << 16) | (10))
#define EFI_1_02_SYSTEM_TABLE_REVISION  ((1 << 16) | (02))
#define EFI_SYSTEM_TABLE_REVISION       EFI_2_50_SYSTEM_TABLE_REVISION
#define EFI_SPECIFICATION_VERSION       EFI_SYSTEM_TABLE_REVISION

#define EFI_RUNTIME_SERVICES_SIGNATURE  SIGNATURE_64 ('R','U','N','T','S','E','R','V')
#define EFI_RUNTIME_SERVICES_REVISION   EFI_SPECIFICATION_VERSION

///
/// EFI Runtime Services Table.
///
typedef struct {
  ///
  /// The table header for the EFI Runtime Services Table.
  ///
  EFI_TABLE_HEADER                Hdr;

  //
  // Time Services
  //
  EFI_GET_TIME                    GetTime;
  EFI_SET_TIME                    SetTime;
  EFI_GET_WAKEUP_TIME             GetWakeupTime;
  EFI_SET_WAKEUP_TIME             SetWakeupTime;

  //
  // Virtual Memory Services
  //
  EFI_SET_VIRTUAL_ADDRESS_MAP     SetVirtualAddressMap;
  EFI_CONVERT_POINTER             ConvertPointer;

  //
  // Variable Services
  //
  EFI_GET_VARIABLE                GetVariable;
  EFI_GET_NEXT_VARIABLE_NAME      GetNextVariableName;
  EFI_SET_VARIABLE                SetVariable;

  //
  // Miscellaneous Services
  //
  EFI_GET_NEXT_HIGH_MONO_COUNT    GetNextHighMonotonicCount;
  EFI_RESET_SYSTEM                ResetSystem;

  //
  // UEFI 2.0 Capsule Services
  //
  EFI_UPDATE_CAPSULE              UpdateCapsule;
  EFI_QUERY_CAPSULE_CAPABILITIES  QueryCapsuleCapabilities;

  //
  // Miscellaneous UEFI 2.0 Service
  //
  EFI_QUERY_VARIABLE_INFO         QueryVariableInfo;
} EFI_RUNTIME_SERVICES;


#define EFI_BOOT_SERVICES_SIGNATURE   SIGNATURE_64 ('B','O','O','T','S','E','R','V')
#define EFI_BOOT_SERVICES_REVISION    EFI_SPECIFICATION_VERSION

///
/// EFI Boot Services Table.
///
typedef struct {
  ///
  /// The table header for the EFI Boot Services Table.
  ///
  EFI_TABLE_HEADER                Hdr;

  //
  // Task Priority Services
  //
  EFI_RAISE_TPL                   RaiseTPL;
  EFI_RESTORE_TPL                 RestoreTPL;

  //
  // Memory Services
  //
  EFI_ALLOCATE_PAGES              AllocatePages;
  EFI_FREE_PAGES                  FreePages;
  EFI_GET_MEMORY_MAP              GetMemoryMap;
  EFI_ALLOCATE_POOL               AllocatePool;
  EFI_FREE_POOL                   FreePool;

  //
  // Event & Timer Services
  //
  EFI_CREATE_EVENT                  CreateEvent;
  EFI_SET_TIMER                     SetTimer;
  EFI_WAIT_FOR_EVENT                WaitForEvent;
  EFI_SIGNAL_EVENT                  SignalEvent;
  EFI_CLOSE_EVENT                   CloseEvent;
  EFI_CHECK_EVENT                   CheckEvent;

  //
  // Protocol Handler Services
  //
  EFI_INSTALL_PROTOCOL_INTERFACE    InstallProtocolInterface;
  EFI_REINSTALL_PROTOCOL_INTERFACE  ReinstallProtocolInterface;
  EFI_UNINSTALL_PROTOCOL_INTERFACE  UninstallProtocolInterface;
  EFI_HANDLE_PROTOCOL               HandleProtocol;
  VOID                              *Reserved;
  EFI_REGISTER_PROTOCOL_NOTIFY      RegisterProtocolNotify;
  EFI_LOCATE_HANDLE                 LocateHandle;
  EFI_LOCATE_DEVICE_PATH            LocateDevicePath;
  EFI_INSTALL_CONFIGURATION_TABLE   InstallConfigurationTable;

  //
  // Image Services
  //
  EFI_IMAGE_LOAD                    LoadImage;
  EFI_IMAGE_START                   StartImage;
  EFI_EXIT                          Exit;
  EFI_IMAGE_UNLOAD                  UnloadImage;
  EFI_EXIT_BOOT_SERVICES            ExitBootServices;

  //
  // Miscellaneous Services
  //
  EFI_GET_NEXT_MONOTONIC_COUNT      GetNextMonotonicCount;
  EFI_STALL                         Stall;
  EFI_SET_WATCHDOG_TIMER            SetWatchdogTimer;

  //
  // DriverSupport Services
  //
  EFI_CONNECT_CONTROLLER            ConnectController;
  EFI_DISCONNECT_CONTROLLER         DisconnectController;

  //
  // Open and Close Protocol Services
  //
  EFI_OPEN_PROTOCOL                 OpenProtocol;
  EFI_CLOSE_PROTOCOL                CloseProtocol;
  EFI_OPEN_PROTOCOL_INFORMATION     OpenProtocolInformation;

  //
  // Library Services
  //
  EFI_PROTOCOLS_PER_HANDLE          ProtocolsPerHandle;
  EFI_LOCATE_HANDLE_BUFFER          LocateHandleBuffer;
  EFI_LOCATE_PROTOCOL               LocateProtocol;
  EFI_INSTALL_MULTIPLE_PROTOCOL_INTERFACES    InstallMultipleProtocolInterfaces;
  EFI_UNINSTALL_MULTIPLE_PROTOCOL_INTERFACES  UninstallMultipleProtocolInterfaces;

  //
  // 32-bit CRC Services
  //
  EFI_CALCULATE_CRC32               CalculateCrc32;

  //
  // Miscellaneous Services
  //
  EFI_COPY_MEM                      CopyMem;
  EFI_SET_MEM                       SetMem;
  EFI_CREATE_EVENT_EX               CreateEventEx;
} EFI_BOOT_SERVICES;

///
/// Contains a set of GUID/pointer pairs comprised of the ConfigurationTable field in the
/// EFI System Table.
///
typedef struct {
  ///
  /// The 128-bit GUID value that uniquely identifies the system configuration table.
  ///
  EFI_GUID                          VendorGuid;
  ///
  /// A pointer to the table associated with VendorGuid.
  ///
  VOID                              *VendorTable;
} EFI_CONFIGURATION_TABLE;

///
/// EFI System Table
///
typedef struct {
  ///
  /// The table header for the EFI System Table.
  ///
  EFI_TABLE_HEADER                  Hdr;
  ///
  /// A pointer to a null terminated string that identifies the vendor
  /// that produces the system firmware for the platform.
  ///
  CHAR16                            *FirmwareVendor;
  ///
  /// A firmware vendor specific value that identifies the revision
  /// of the system firmware for the platform.
  ///
  UINT32                            FirmwareRevision;
  ///
  /// The handle for the active console input device. This handle must support
  /// EFI_SIMPLE_TEXT_INPUT_PROTOCOL and EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL.
  ///
  EFI_HANDLE                        ConsoleInHandle;
  ///
  /// A pointer to the EFI_SIMPLE_TEXT_INPUT_PROTOCOL interface that is
  /// associated with ConsoleInHandle.
  ///
  EFI_SIMPLE_TEXT_INPUT_PROTOCOL    *ConIn;
  ///
  /// The handle for the active console output device.
  ///
  EFI_HANDLE                        ConsoleOutHandle;
  ///
  /// A pointer to the EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL interface
  /// that is associated with ConsoleOutHandle.
  ///
  EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL   *ConOut;
  ///
  /// The handle for the active standard error console device.
  /// This handle must support the EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL.
  ///
  EFI_HANDLE                        StandardErrorHandle;
  ///
  /// A pointer to the EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL interface
  /// that is associated with StandardErrorHandle.
  ///
  EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL   *StdErr;
  ///
  /// A pointer to the EFI Runtime Services Table.
  ///
  EFI_RUNTIME_SERVICES              *RuntimeServices;
  ///
  /// A pointer to the EFI Boot Services Table.
  ///
  EFI_BOOT_SERVICES                 *BootServices;
  ///
  /// The number of system configuration tables in the buffer ConfigurationTable.
  ///
  UINTN                             NumberOfTableEntries;
  ///
  /// A pointer to the system configuration tables.
  /// The number of entries in the table is NumberOfTableEntries.
  ///
  EFI_CONFIGURATION_TABLE           *ConfigurationTable;
} EFI_SYSTEM_TABLE;

/**
  This is the declaration of an EFI image entry point. This entry point is
  the same for UEFI Applications, UEFI OS Loaders, and UEFI Drivers including
  both device drivers and bus drivers.

  @param[in]  ImageHandle       The firmware allocated handle for the UEFI image.
  @param[in]  SystemTable       A pointer to the EFI System Table.

  @retval EFI_SUCCESS           The operation completed successfully.
  @retval Others                An unexpected error occurred.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_IMAGE_ENTRY_POINT)(
  IN  EFI_HANDLE                   ImageHandle,
  IN  EFI_SYSTEM_TABLE             *SystemTable
  );

//
// EFI Load Option. This data structure describes format of UEFI boot option variables.
//
// NOTE: EFI Load Option is a byte packed buffer of variable length fields.
// The first two fields have fixed length. They are declared as members of the
// EFI_LOAD_OPTION structure. All the other fields are variable length fields.
// They are listed in the comment block below for reference purposes.
//
#pragma pack(1)
typedef struct _EFI_LOAD_OPTION {
  ///
  /// The attributes for this load option entry. All unused bits must be zero
  /// and are reserved by the UEFI specification for future growth.
  ///
  UINT32                           Attributes;
  ///
  /// Length in bytes of the FilePathList. OptionalData starts at offset
  /// sizeof(UINT32) + sizeof(UINT16) + StrSize(Description) + FilePathListLength
  /// of the EFI_LOAD_OPTION descriptor.
  ///
  UINT16                           FilePathListLength;
  ///
  /// The user readable description for the load option.
  /// This field ends with a Null character.
  ///
  // CHAR16                        Description[];
  ///
  /// A packed array of UEFI device paths. The first element of the array is a
  /// device path that describes the device and location of the Image for this
  /// load option. The FilePathList[0] is specific to the device type. Other
  /// device paths may optionally exist in the FilePathList, but their usage is
  /// OSV specific. Each element in the array is variable length, and ends at
  /// the device path end structure. Because the size of Description is
  /// arbitrary, this data structure is not guaranteed to be aligned on a
  /// natural boundary. This data structure may have to be copied to an aligned
  /// natural boundary before it is used.
  ///
  // EFI_DEVICE_PATH_PROTOCOL      FilePathList[];
  ///
  /// The remaining bytes in the load option descriptor are a binary data buffer
  /// that is passed to the loaded image. If the field is zero bytes long, a
  /// NULL pointer is passed to the loaded image. The number of bytes in
  /// OptionalData can be computed by subtracting the starting offset of
  /// OptionalData from total size in bytes of the EFI_LOAD_OPTION.
  ///
  // UINT8                         OptionalData[];
} EFI_LOAD_OPTION;
#pragma pack()

//
// EFI Load Options Attributes
//
#define LOAD_OPTION_ACTIVE              0x00000001
#define LOAD_OPTION_FORCE_RECONNECT     0x00000002
#define LOAD_OPTION_HIDDEN              0x00000008
#define LOAD_OPTION_CATEGORY            0x00001F00

#define LOAD_OPTION_CATEGORY_BOOT       0x00000000
#define LOAD_OPTION_CATEGORY_APP        0x00000100

#define EFI_BOOT_OPTION_SUPPORT_KEY     0x00000001
#define EFI_BOOT_OPTION_SUPPORT_APP     0x00000002
#define EFI_BOOT_OPTION_SUPPORT_SYSPREP 0x00000010
#define EFI_BOOT_OPTION_SUPPORT_COUNT   0x00000300

///
/// EFI Boot Key Data
///
typedef union {
  struct {
    ///
    /// Indicates the revision of the EFI_KEY_OPTION structure. This revision level should be 0.
    ///
    UINT32  Revision        : 8;
    ///
    /// Either the left or right Shift keys must be pressed (1) or must not be pressed (0).
    ///
    UINT32  ShiftPressed    : 1;
    ///
    /// Either the left or right Control keys must be pressed (1) or must not be pressed (0).
    ///
    UINT32  ControlPressed  : 1;
    ///
    /// Either the left or right Alt keys must be pressed (1) or must not be pressed (0).
    ///
    UINT32  AltPressed      : 1;
    ///
    /// Either the left or right Logo keys must be pressed (1) or must not be pressed (0).
    ///
    UINT32  LogoPressed     : 1;
    ///
    /// The Menu key must be pressed (1) or must not be pressed (0).
    ///
    UINT32  MenuPressed     : 1;
    ///
    /// The SysReq key must be pressed (1) or must not be pressed (0).
    ///
    UINT32  SysReqPressed    : 1;
    UINT32  Reserved        : 16;
    ///
    /// Specifies the actual number of entries in EFI_KEY_OPTION.Keys, from 0-3. If
    /// zero, then only the shift state is considered. If more than one, then the boot option will
    /// only be launched if all of the specified keys are pressed with the same shift state.
    ///
    UINT32  InputKeyCount   : 2;
  } Options;
  UINT32  PackedValue;
} EFI_BOOT_KEY_DATA;

///
/// EFI Key Option.
///
#pragma pack(1)
typedef struct {
  ///
  /// Specifies options about how the key will be processed.
  ///
  EFI_BOOT_KEY_DATA  KeyData;
  ///
  /// The CRC-32 which should match the CRC-32 of the entire EFI_LOAD_OPTION to
  /// which BootOption refers. If the CRC-32s do not match this value, then this key
  /// option is ignored.
  ///
  UINT32             BootOptionCrc;
  ///
  /// The Boot#### option which will be invoked if this key is pressed and the boot option
  /// is active (LOAD_OPTION_ACTIVE is set).
  ///
  UINT16             BootOption;
  ///
  /// The key codes to compare against those returned by the
  /// EFI_SIMPLE_TEXT_INPUT and EFI_SIMPLE_TEXT_INPUT_EX protocols.
  /// The number of key codes (0-3) is specified by the EFI_KEY_CODE_COUNT field in KeyOptions.
  ///
  //EFI_INPUT_KEY      Keys[];
} EFI_KEY_OPTION;
#pragma pack()

//
// EFI File location to boot from on removable media devices
//
#define EFI_REMOVABLE_MEDIA_FILE_NAME_IA32    L"\\EFI\\BOOT\\BOOTIA32.EFI"
#define EFI_REMOVABLE_MEDIA_FILE_NAME_IA64    L"\\EFI\\BOOT\\BOOTIA64.EFI"
#define EFI_REMOVABLE_MEDIA_FILE_NAME_X64     L"\\EFI\\BOOT\\BOOTX64.EFI"
#define EFI_REMOVABLE_MEDIA_FILE_NAME_ARM     L"\\EFI\\BOOT\\BOOTARM.EFI"
#define EFI_REMOVABLE_MEDIA_FILE_NAME_AARCH64 L"\\EFI\\BOOT\\BOOTAA64.EFI"

#if   defined (MDE_CPU_IA32)
  #define EFI_REMOVABLE_MEDIA_FILE_NAME   EFI_REMOVABLE_MEDIA_FILE_NAME_IA32
#elif defined (MDE_CPU_IPF)
  #define EFI_REMOVABLE_MEDIA_FILE_NAME   EFI_REMOVABLE_MEDIA_FILE_NAME_IA64
#elif defined (MDE_CPU_X64)
  #define EFI_REMOVABLE_MEDIA_FILE_NAME   EFI_REMOVABLE_MEDIA_FILE_NAME_X64
#elif defined (MDE_CPU_EBC)
#elif defined (MDE_CPU_ARM)
  #define EFI_REMOVABLE_MEDIA_FILE_NAME   EFI_REMOVABLE_MEDIA_FILE_NAME_ARM
#elif defined (MDE_CPU_AARCH64)
  #define EFI_REMOVABLE_MEDIA_FILE_NAME   EFI_REMOVABLE_MEDIA_FILE_NAME_AARCH64
#else
  #error Unknown Processor Type
#endif

#include <Uefi/UefiPxe.h>
#include <Uefi/UefiGpt.h>
#include <Uefi/UefiInternalFormRepresentation.h>

#endif