xref: /device/linaro/bootloader/edk2/MdeModulePkg/Core/PiSmmCore/PiSmmCore.h

/** @file
  The internal header file includes the common header files, defines
  internal structure and functions used by SmmCore module.

  Copyright (c) 2009 - 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 which accompanies this
  distribution.  The full text of the license may be found at
  http://opensource.org/licenses/bsd-license.php

  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

**/

#ifndef _SMM_CORE_H_
#define _SMM_CORE_H_

#include <PiSmm.h>

#include <Protocol/DxeSmmReadyToLock.h>
#include <Protocol/SmmReadyToLock.h>
#include <Protocol/SmmEndOfDxe.h>
#include <Protocol/CpuIo2.h>
#include <Protocol/SmmCommunication.h>
#include <Protocol/SmmAccess2.h>
#include <Protocol/FirmwareVolume2.h>
#include <Protocol/LoadedImage.h>
#include <Protocol/DevicePath.h>
#include <Protocol/Security.h>
#include <Protocol/Security2.h>
#include <Protocol/SmmExitBootServices.h>
#include <Protocol/SmmLegacyBoot.h>
#include <Protocol/SmmReadyToBoot.h>

#include <Guid/Apriori.h>
#include <Guid/EventGroup.h>
#include <Guid/EventLegacyBios.h>
#include <Guid/ZeroGuid.h>
#include <Guid/MemoryProfile.h>

#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/PeCoffLib.h>
#include <Library/CacheMaintenanceLib.h>
#include <Library/DebugLib.h>
#include <Library/ReportStatusCodeLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/DevicePathLib.h>
#include <Library/UefiLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/PcdLib.h>
#include <Library/SmmCorePlatformHookLib.h>
#include <Library/PerformanceLib.h>
#include <Library/TimerLib.h>
#include <Library/HobLib.h>
#include <Library/SmmMemLib.h>

#include "PiSmmCorePrivateData.h"

//
// Used to build a table of SMI Handlers that the SMM Core registers
//
typedef struct {
  EFI_SMM_HANDLER_ENTRY_POINT2  Handler;
  EFI_GUID                      *HandlerType;
  EFI_HANDLE                    DispatchHandle;
  BOOLEAN                       UnRegister;
} SMM_CORE_SMI_HANDLERS;

//
// Structure for recording the state of an SMM Driver
//
#define EFI_SMM_DRIVER_ENTRY_SIGNATURE SIGNATURE_32('s', 'd','r','v')

typedef struct {
  UINTN                           Signature;
  LIST_ENTRY                      Link;             // mDriverList

  LIST_ENTRY                      ScheduledLink;    // mScheduledQueue

  EFI_HANDLE                      FvHandle;
  EFI_GUID                        FileName;
  EFI_DEVICE_PATH_PROTOCOL        *FvFileDevicePath;
  EFI_FIRMWARE_VOLUME2_PROTOCOL   *Fv;

  VOID                            *Depex;
  UINTN                           DepexSize;

  BOOLEAN                         Before;
  BOOLEAN                         After;
  EFI_GUID                        BeforeAfterGuid;

  BOOLEAN                         Dependent;
  BOOLEAN                         Scheduled;
  BOOLEAN                         Initialized;
  BOOLEAN                         DepexProtocolError;

  EFI_HANDLE                      ImageHandle;
  EFI_LOADED_IMAGE_PROTOCOL       *LoadedImage;
  //
  // Image EntryPoint in SMRAM
  //
  PHYSICAL_ADDRESS                ImageEntryPoint;
  //
  // Image Buffer in SMRAM
  //
  PHYSICAL_ADDRESS                ImageBuffer;
  //
  // Image Page Number
  //
  UINTN                           NumberOfPage;
} EFI_SMM_DRIVER_ENTRY;

#define EFI_HANDLE_SIGNATURE            SIGNATURE_32('h','n','d','l')

///
/// IHANDLE - contains a list of protocol handles
///
typedef struct {
  UINTN               Signature;
  /// All handles list of IHANDLE
  LIST_ENTRY          AllHandles;
  /// List of PROTOCOL_INTERFACE's for this handle
  LIST_ENTRY          Protocols;
  UINTN               LocateRequest;
} IHANDLE;

#define ASSERT_IS_HANDLE(a)  ASSERT((a)->Signature == EFI_HANDLE_SIGNATURE)

#define PROTOCOL_ENTRY_SIGNATURE        SIGNATURE_32('p','r','t','e')

///
/// PROTOCOL_ENTRY - each different protocol has 1 entry in the protocol
/// database.  Each handler that supports this protocol is listed, along
/// with a list of registered notifies.
///
typedef struct {
  UINTN               Signature;
  /// Link Entry inserted to mProtocolDatabase
  LIST_ENTRY          AllEntries;
  /// ID of the protocol
  EFI_GUID            ProtocolID;
  /// All protocol interfaces
  LIST_ENTRY          Protocols;
  /// Registerd notification handlers
  LIST_ENTRY          Notify;
} PROTOCOL_ENTRY;

#define PROTOCOL_INTERFACE_SIGNATURE  SIGNATURE_32('p','i','f','c')

///
/// PROTOCOL_INTERFACE - each protocol installed on a handle is tracked
/// with a protocol interface structure
///
typedef struct {
  UINTN                       Signature;
  /// Link on IHANDLE.Protocols
  LIST_ENTRY                  Link;
  /// Back pointer
  IHANDLE                     *Handle;
  /// Link on PROTOCOL_ENTRY.Protocols
  LIST_ENTRY                  ByProtocol;
  /// The protocol ID
  PROTOCOL_ENTRY              *Protocol;
  /// The interface value
  VOID                        *Interface;
} PROTOCOL_INTERFACE;

#define PROTOCOL_NOTIFY_SIGNATURE       SIGNATURE_32('p','r','t','n')

///
/// PROTOCOL_NOTIFY - used for each register notification for a protocol
///
typedef struct {
  UINTN               Signature;
  PROTOCOL_ENTRY      *Protocol;
  /// All notifications for this protocol
  LIST_ENTRY          Link;
  /// Notification function
  EFI_SMM_NOTIFY_FN   Function;
  /// Last position notified
  LIST_ENTRY          *Position;
} PROTOCOL_NOTIFY;

//
// SMM Core Global Variables
//
extern SMM_CORE_PRIVATE_DATA  *gSmmCorePrivate;
extern EFI_SMM_SYSTEM_TABLE2  gSmmCoreSmst;
extern LIST_ENTRY             gHandleList;
extern EFI_PHYSICAL_ADDRESS   gLoadModuleAtFixAddressSmramBase;

/**
  Called to initialize the memory service.

  @param   SmramRangeCount       Number of SMRAM Regions
  @param   SmramRanges           Pointer to SMRAM Descriptors

**/
VOID
SmmInitializeMemoryServices (
  IN UINTN                 SmramRangeCount,
  IN EFI_SMRAM_DESCRIPTOR  *SmramRanges
  );

/**
  The SmmInstallConfigurationTable() function is used to maintain the list
  of configuration tables that are stored in the System Management System
  Table.  The list is stored as an array of (GUID, Pointer) pairs.  The list
  must be allocated from pool memory with PoolType set to EfiRuntimeServicesData.

  @param  SystemTable      A pointer to the SMM System Table (SMST).
  @param  Guid             A pointer to the GUID for the entry to add, update, or remove.
  @param  Table            A pointer to the buffer of the table to add.
  @param  TableSize        The size of the table to install.

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

**/
EFI_STATUS
EFIAPI
SmmInstallConfigurationTable (
  IN  CONST EFI_SMM_SYSTEM_TABLE2  *SystemTable,
  IN  CONST EFI_GUID              *Guid,
  IN  VOID                        *Table,
  IN  UINTN                       TableSize
  );

/**
  Wrapper function to SmmInstallProtocolInterfaceNotify.  This is the public API which
  Calls the private one which contains a BOOLEAN parameter for notifications

  @param  UserHandle             The handle to install the protocol handler on,
                                 or NULL if a new handle is to be allocated
  @param  Protocol               The protocol to add to the handle
  @param  InterfaceType          Indicates whether Interface is supplied in
                                 native form.
  @param  Interface              The interface for the protocol being added

  @return Status code

**/
EFI_STATUS
EFIAPI
SmmInstallProtocolInterface (
  IN OUT EFI_HANDLE     *UserHandle,
  IN EFI_GUID           *Protocol,
  IN EFI_INTERFACE_TYPE InterfaceType,
  IN VOID               *Interface
  );

/**
  Allocates pages from the memory map.

  @param  Type                   The type of allocation to perform
  @param  MemoryType             The type of memory to turn the allocated pages
                                 into
  @param  NumberOfPages          The number of pages to allocate
  @param  Memory                 A pointer to receive the base allocated memory
                                 address

  @retval EFI_INVALID_PARAMETER  Parameters violate checking rules defined in spec.
  @retval EFI_NOT_FOUND          Could not allocate pages match the requirement.
  @retval EFI_OUT_OF_RESOURCES   No enough pages to allocate.
  @retval EFI_SUCCESS            Pages successfully allocated.

**/
EFI_STATUS
EFIAPI
SmmAllocatePages (
  IN      EFI_ALLOCATE_TYPE         Type,
  IN      EFI_MEMORY_TYPE           MemoryType,
  IN      UINTN                     NumberOfPages,
  OUT     EFI_PHYSICAL_ADDRESS      *Memory
  );

/**
  Allocates pages from the memory map.

  @param  Type                   The type of allocation to perform
  @param  MemoryType             The type of memory to turn the allocated pages
                                 into
  @param  NumberOfPages          The number of pages to allocate
  @param  Memory                 A pointer to receive the base allocated memory
                                 address

  @retval EFI_INVALID_PARAMETER  Parameters violate checking rules defined in spec.
  @retval EFI_NOT_FOUND          Could not allocate pages match the requirement.
  @retval EFI_OUT_OF_RESOURCES   No enough pages to allocate.
  @retval EFI_SUCCESS            Pages successfully allocated.

**/
EFI_STATUS
EFIAPI
SmmInternalAllocatePages (
  IN      EFI_ALLOCATE_TYPE         Type,
  IN      EFI_MEMORY_TYPE           MemoryType,
  IN      UINTN                     NumberOfPages,
  OUT     EFI_PHYSICAL_ADDRESS      *Memory
  );

/**
  Frees previous allocated pages.

  @param  Memory                 Base address of memory being freed
  @param  NumberOfPages          The number of pages to free

  @retval EFI_NOT_FOUND          Could not find the entry that covers the range
  @retval EFI_INVALID_PARAMETER  Address not aligned
  @return EFI_SUCCESS            Pages successfully freed.

**/
EFI_STATUS
EFIAPI
SmmFreePages (
  IN      EFI_PHYSICAL_ADDRESS      Memory,
  IN      UINTN                     NumberOfPages
  );

/**
  Frees previous allocated pages.

  @param  Memory                 Base address of memory being freed
  @param  NumberOfPages          The number of pages to free

  @retval EFI_NOT_FOUND          Could not find the entry that covers the range
  @retval EFI_INVALID_PARAMETER  Address not aligned
  @return EFI_SUCCESS            Pages successfully freed.

**/
EFI_STATUS
EFIAPI
SmmInternalFreePages (
  IN      EFI_PHYSICAL_ADDRESS      Memory,
  IN      UINTN                     NumberOfPages
  );

/**
  Allocate pool of a particular type.

  @param  PoolType               Type of pool to allocate
  @param  Size                   The amount of pool to allocate
  @param  Buffer                 The address to return a pointer to the allocated
                                 pool

  @retval EFI_INVALID_PARAMETER  PoolType not valid
  @retval EFI_OUT_OF_RESOURCES   Size exceeds max pool size or allocation failed.
  @retval EFI_SUCCESS            Pool successfully allocated.

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

/**
  Allocate pool of a particular type.

  @param  PoolType               Type of pool to allocate
  @param  Size                   The amount of pool to allocate
  @param  Buffer                 The address to return a pointer to the allocated
                                 pool

  @retval EFI_INVALID_PARAMETER  PoolType not valid
  @retval EFI_OUT_OF_RESOURCES   Size exceeds max pool size or allocation failed.
  @retval EFI_SUCCESS            Pool successfully allocated.

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

/**
  Frees pool.

  @param  Buffer                 The allocated pool entry to free

  @retval EFI_INVALID_PARAMETER  Buffer is not a valid value.
  @retval EFI_SUCCESS            Pool successfully freed.

**/
EFI_STATUS
EFIAPI
SmmFreePool (
  IN      VOID                      *Buffer
  );

/**
  Frees pool.

  @param  Buffer                 The allocated pool entry to free

  @retval EFI_INVALID_PARAMETER  Buffer is not a valid value.
  @retval EFI_SUCCESS            Pool successfully freed.

**/
EFI_STATUS
EFIAPI
SmmInternalFreePool (
  IN      VOID                      *Buffer
  );

/**
  Installs a protocol interface into the boot services environment.

  @param  UserHandle             The handle to install the protocol handler on,
                                 or NULL if a new handle is to be allocated
  @param  Protocol               The protocol to add to the handle
  @param  InterfaceType          Indicates whether Interface is supplied in
                                 native form.
  @param  Interface              The interface for the protocol being added
  @param  Notify                 indicates whether notify the notification list
                                 for this protocol

  @retval EFI_INVALID_PARAMETER  Invalid parameter
  @retval EFI_OUT_OF_RESOURCES   No enough buffer to allocate
  @retval EFI_SUCCESS            Protocol interface successfully installed

**/
EFI_STATUS
SmmInstallProtocolInterfaceNotify (
  IN OUT EFI_HANDLE     *UserHandle,
  IN EFI_GUID           *Protocol,
  IN EFI_INTERFACE_TYPE InterfaceType,
  IN VOID               *Interface,
  IN BOOLEAN            Notify
  );

/**
  Uninstalls all instances of a protocol:interfacer from a handle.
  If the last protocol interface is remove from the handle, the
  handle is freed.

  @param  UserHandle             The handle to remove the protocol handler from
  @param  Protocol               The protocol, of protocol:interface, to remove
  @param  Interface              The interface, of protocol:interface, to remove

  @retval EFI_INVALID_PARAMETER  Protocol is NULL.
  @retval EFI_SUCCESS            Protocol interface successfully uninstalled.

**/
EFI_STATUS
EFIAPI
SmmUninstallProtocolInterface (
  IN EFI_HANDLE       UserHandle,
  IN EFI_GUID         *Protocol,
  IN VOID             *Interface
  );

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

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

  @return The requested protocol interface for the handle

**/
EFI_STATUS
EFIAPI
SmmHandleProtocol (
  IN EFI_HANDLE       UserHandle,
  IN EFI_GUID         *Protocol,
  OUT VOID            **Interface
  );

/**
  Add a new protocol notification record for the request protocol.

  @param  Protocol               The requested protocol to add the notify
                                 registration
  @param  Function               Points to the notification function
  @param  Registration           Returns the registration record

  @retval EFI_INVALID_PARAMETER  Invalid parameter
  @retval EFI_SUCCESS            Successfully returned the registration record
                                 that has been added

**/
EFI_STATUS
EFIAPI
SmmRegisterProtocolNotify (
  IN  CONST EFI_GUID              *Protocol,
  IN  EFI_SMM_NOTIFY_FN           Function,
  OUT VOID                        **Registration
  );

/**
  Locates the requested handle(s) and returns them in Buffer.

  @param  SearchType             The type of search to perform to locate the
                                 handles
  @param  Protocol               The protocol to search for
  @param  SearchKey              Dependant on SearchType
  @param  BufferSize             On input the size of Buffer.  On output the
                                 size of data returned.
  @param  Buffer                 The buffer to return the results in

  @retval EFI_BUFFER_TOO_SMALL   Buffer too small, required buffer size is
                                 returned in BufferSize.
  @retval EFI_INVALID_PARAMETER  Invalid parameter
  @retval EFI_SUCCESS            Successfully found the requested handle(s) and
                                 returns them in Buffer.

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

/**
  Return the first Protocol Interface that matches the Protocol GUID. If
  Registration is pasased in return a Protocol Instance that was just add
  to the system. If Retistration is NULL return the first Protocol Interface
  you find.

  @param  Protocol               The protocol to search for
  @param  Registration           Optional Registration Key returned from
                                 RegisterProtocolNotify()
  @param  Interface              Return the Protocol interface (instance).

  @retval EFI_SUCCESS            If a valid Interface is returned
  @retval EFI_INVALID_PARAMETER  Invalid parameter
  @retval EFI_NOT_FOUND          Protocol interface not found

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

/**
  Manage SMI of a particular type.

  @param  HandlerType    Points to the handler type or NULL for root SMI handlers.
  @param  Context        Points to an optional context buffer.
  @param  CommBuffer     Points to the optional communication buffer.
  @param  CommBufferSize Points to the size of the optional communication buffer.

  @retval EFI_SUCCESS                        Interrupt source was processed successfully but not quiesced.
  @retval EFI_INTERRUPT_PENDING              One or more SMI sources could not be quiesced.
  @retval EFI_WARN_INTERRUPT_SOURCE_PENDING  Interrupt source was not handled or quiesced.
  @retval EFI_WARN_INTERRUPT_SOURCE_QUIESCED Interrupt source was handled and quiesced.

**/
EFI_STATUS
EFIAPI
SmiManage (
  IN     CONST EFI_GUID           *HandlerType,
  IN     CONST VOID               *Context         OPTIONAL,
  IN OUT VOID                     *CommBuffer      OPTIONAL,
  IN OUT UINTN                    *CommBufferSize  OPTIONAL
  );

/**
  Registers a handler to execute within SMM.

  @param  Handler        Handler service funtion pointer.
  @param  HandlerType    Points to the handler type or NULL for root SMI handlers.
  @param  DispatchHandle On return, contains a unique handle which can be used to later unregister the handler function.

  @retval EFI_SUCCESS           Handler register success.
  @retval EFI_INVALID_PARAMETER Handler or DispatchHandle is NULL.

**/
EFI_STATUS
EFIAPI
SmiHandlerRegister (
  IN   EFI_SMM_HANDLER_ENTRY_POINT2   Handler,
  IN   CONST EFI_GUID                 *HandlerType  OPTIONAL,
  OUT  EFI_HANDLE                     *DispatchHandle
  );

/**
  Unregister a handler in SMM.

  @param  DispatchHandle  The handle that was specified when the handler was registered.

  @retval EFI_SUCCESS           Handler function was successfully unregistered.
  @retval EFI_INVALID_PARAMETER DispatchHandle does not refer to a valid handle.

**/
EFI_STATUS
EFIAPI
SmiHandlerUnRegister (
  IN  EFI_HANDLE                      DispatchHandle
  );

/**
  This function is the main entry point for an SMM handler dispatch
  or communicate-based callback.

  @param  DispatchHandle  The unique handle assigned to this handler by SmiHandlerRegister().
  @param  Context         Points to an optional handler context which was specified when the handler was registered.
  @param  CommBuffer      A pointer to a collection of data in memory that will
                          be conveyed from a non-SMM environment into an SMM environment.
  @param  CommBufferSize  The size of the CommBuffer.

  @return Status Code

**/
EFI_STATUS
EFIAPI
SmmDriverDispatchHandler (
  IN     EFI_HANDLE               DispatchHandle,
  IN     CONST VOID               *Context,        OPTIONAL
  IN OUT VOID                     *CommBuffer,     OPTIONAL
  IN OUT UINTN                    *CommBufferSize  OPTIONAL
  );

/**
  This function is the main entry point for an SMM handler dispatch
  or communicate-based callback.

  @param  DispatchHandle  The unique handle assigned to this handler by SmiHandlerRegister().
  @param  Context         Points to an optional handler context which was specified when the handler was registered.
  @param  CommBuffer      A pointer to a collection of data in memory that will
                          be conveyed from a non-SMM environment into an SMM environment.
  @param  CommBufferSize  The size of the CommBuffer.

  @return Status Code

**/
EFI_STATUS
EFIAPI
SmmLegacyBootHandler (
  IN     EFI_HANDLE               DispatchHandle,
  IN     CONST VOID               *Context,        OPTIONAL
  IN OUT VOID                     *CommBuffer,     OPTIONAL
  IN OUT UINTN                    *CommBufferSize  OPTIONAL
  );

/**
  This function is the main entry point for an SMM handler dispatch
  or communicate-based callback.

  @param  DispatchHandle  The unique handle assigned to this handler by SmiHandlerRegister().
  @param  Context         Points to an optional handler context which was specified when the handler was registered.
  @param  CommBuffer      A pointer to a collection of data in memory that will
                          be conveyed from a non-SMM environment into an SMM environment.
  @param  CommBufferSize  The size of the CommBuffer.

  @return Status Code

**/
EFI_STATUS
EFIAPI
SmmReadyToLockHandler (
  IN     EFI_HANDLE               DispatchHandle,
  IN     CONST VOID               *Context,        OPTIONAL
  IN OUT VOID                     *CommBuffer,     OPTIONAL
  IN OUT UINTN                    *CommBufferSize  OPTIONAL
  );

/**
  This function is the main entry point for an SMM handler dispatch
  or communicate-based callback.

  @param  DispatchHandle  The unique handle assigned to this handler by SmiHandlerRegister().
  @param  Context         Points to an optional handler context which was specified when the handler was registered.
  @param  CommBuffer      A pointer to a collection of data in memory that will
                          be conveyed from a non-SMM environment into an SMM environment.
  @param  CommBufferSize  The size of the CommBuffer.

  @return Status Code

**/
EFI_STATUS
EFIAPI
SmmEndOfDxeHandler (
  IN     EFI_HANDLE               DispatchHandle,
  IN     CONST VOID               *Context,        OPTIONAL
  IN OUT VOID                     *CommBuffer,     OPTIONAL
  IN OUT UINTN                    *CommBufferSize  OPTIONAL
  );

/**
  This function is the main entry point for an SMM handler dispatch
  or communicate-based callback.

  @param  DispatchHandle  The unique handle assigned to this handler by SmiHandlerRegister().
  @param  Context         Points to an optional handler context which was specified when the handler was registered.
  @param  CommBuffer      A pointer to a collection of data in memory that will
                          be conveyed from a non-SMM environment into an SMM environment.
  @param  CommBufferSize  The size of the CommBuffer.

  @return Status Code

**/
EFI_STATUS
EFIAPI
SmmExitBootServicesHandler (
  IN     EFI_HANDLE               DispatchHandle,
  IN     CONST VOID               *Context,        OPTIONAL
  IN OUT VOID                     *CommBuffer,     OPTIONAL
  IN OUT UINTN                    *CommBufferSize  OPTIONAL
  );

/**
  This function is the main entry point for an SMM handler dispatch
  or communicate-based callback.

  @param  DispatchHandle  The unique handle assigned to this handler by SmiHandlerRegister().
  @param  Context         Points to an optional handler context which was specified when the handler was registered.
  @param  CommBuffer      A pointer to a collection of data in memory that will
                          be conveyed from a non-SMM environment into an SMM environment.
  @param  CommBufferSize  The size of the CommBuffer.

  @return Status Code

**/
EFI_STATUS
EFIAPI
SmmReadyToBootHandler (
  IN     EFI_HANDLE               DispatchHandle,
  IN     CONST VOID               *Context,        OPTIONAL
  IN OUT VOID                     *CommBuffer,     OPTIONAL
  IN OUT UINTN                    *CommBufferSize  OPTIONAL
  );

/**
  Place holder function until all the SMM System Table Service are available.

  @param  Arg1                   Undefined
  @param  Arg2                   Undefined
  @param  Arg3                   Undefined
  @param  Arg4                   Undefined
  @param  Arg5                   Undefined

  @return EFI_NOT_AVAILABLE_YET

**/
EFI_STATUS
EFIAPI
SmmEfiNotAvailableYetArg5 (
  UINTN Arg1,
  UINTN Arg2,
  UINTN Arg3,
  UINTN Arg4,
  UINTN Arg5
  );

//
//Functions used during debug buils
//

/**
  Traverse the discovered list for any drivers that were discovered but not loaded
  because the dependency experessions evaluated to false.

**/
VOID
SmmDisplayDiscoveredNotDispatched (
  VOID
  );

/**
  Add free SMRAM region for use by memory service.

  @param  MemBase                Base address of memory region.
  @param  MemLength              Length of the memory region.
  @param  Type                   Memory type.
  @param  Attributes             Memory region state.

**/
VOID
SmmAddMemoryRegion (
  IN      EFI_PHYSICAL_ADDRESS      MemBase,
  IN      UINT64                    MemLength,
  IN      EFI_MEMORY_TYPE           Type,
  IN      UINT64                    Attributes
  );

/**
  Finds the protocol entry for the requested protocol.

  @param  Protocol               The ID of the protocol
  @param  Create                 Create a new entry if not found

  @return Protocol entry

**/
PROTOCOL_ENTRY  *
SmmFindProtocolEntry (
  IN EFI_GUID   *Protocol,
  IN BOOLEAN    Create
  );

/**
  Signal event for every protocol in protocol entry.

  @param  Prot                   Protocol interface

**/
VOID
SmmNotifyProtocol (
  IN PROTOCOL_INTERFACE   *Prot
  );

/**
  Finds the protocol instance for the requested handle and protocol.
  Note: This function doesn't do parameters checking, it's caller's responsibility
  to pass in valid parameters.

  @param  Handle                 The handle to search the protocol on
  @param  Protocol               GUID of the protocol
  @param  Interface              The interface for the protocol being searched

  @return Protocol instance (NULL: Not found)

**/
PROTOCOL_INTERFACE *
SmmFindProtocolInterface (
  IN IHANDLE        *Handle,
  IN EFI_GUID       *Protocol,
  IN VOID           *Interface
  );

/**
  Removes Protocol from the protocol list (but not the handle list).

  @param  Handle                 The handle to remove protocol on.
  @param  Protocol               GUID of the protocol to be moved
  @param  Interface              The interface of the protocol

  @return Protocol Entry

**/
PROTOCOL_INTERFACE *
SmmRemoveInterfaceFromProtocol (
  IN IHANDLE        *Handle,
  IN EFI_GUID       *Protocol,
  IN VOID           *Interface
  );

/**
  This is the POSTFIX version of the dependency evaluator.  This code does
  not need to handle Before or After, as it is not valid to call this
  routine in this case. POSTFIX means all the math is done on top of the stack.

  @param  DriverEntry           DriverEntry element to update.

  @retval TRUE                  If driver is ready to run.
  @retval FALSE                 If driver is not ready to run or some fatal error
                                was found.

**/
BOOLEAN
SmmIsSchedulable (
  IN  EFI_SMM_DRIVER_ENTRY   *DriverEntry
  );

//
// SmramProfile
//

/**
  Initialize SMRAM profile.

**/
VOID
SmramProfileInit (
  VOID
  );

/**
  Register SMM image to SMRAM profile.

  @param DriverEntry    SMM image info.
  @param RegisterToDxe  Register image to DXE.

  @retval TRUE          Register success.
  @retval FALSE         Register fail.

**/
BOOLEAN
RegisterSmramProfileImage (
  IN EFI_SMM_DRIVER_ENTRY   *DriverEntry,
  IN BOOLEAN                RegisterToDxe
  );

/**
  Unregister image from SMRAM profile.

  @param DriverEntry        SMM image info.
  @param UnregisterToDxe    Unregister image from DXE.

  @retval TRUE              Unregister success.
  @retval FALSE             Unregister fail.

**/
BOOLEAN
UnregisterSmramProfileImage (
  IN EFI_SMM_DRIVER_ENTRY   *DriverEntry,
  IN BOOLEAN                UnregisterToDxe
  );

/**
  Update SMRAM profile information.

  @param CallerAddress  Address of caller who call Allocate or Free.
  @param Action         This Allocate or Free action.
  @param MemoryType     Memory type.
  @param Size           Buffer size.
  @param Buffer         Buffer address.

  @retval TRUE          Profile udpate success.
  @retval FALSE         Profile update fail.

**/
BOOLEAN
SmmCoreUpdateProfile (
  IN EFI_PHYSICAL_ADDRESS CallerAddress,
  IN MEMORY_PROFILE_ACTION Action,
  IN EFI_MEMORY_TYPE      MemoryType, // Valid for AllocatePages/AllocatePool
  IN UINTN                Size,       // Valid for AllocatePages/FreePages/AllocatePool
  IN VOID                 *Buffer
  );

/**
  Register SMRAM profile handler.

**/
VOID
RegisterSmramProfileHandler (
  VOID
  );

/**
  SMRAM profile ready to lock callback function.

**/
VOID
SmramProfileReadyToLock (
  VOID
  );

extern UINTN                    mFullSmramRangeCount;
extern EFI_SMRAM_DESCRIPTOR     *mFullSmramRanges;

extern EFI_LOADED_IMAGE_PROTOCOL  *mSmmCoreLoadedImage;

//
// Page management
//

typedef struct {
  LIST_ENTRY  Link;
  UINTN       NumberOfPages;
} FREE_PAGE_LIST;

extern LIST_ENTRY  mSmmMemoryMap;

//
// Pool management
//

//
// MIN_POOL_SHIFT must not be less than 5
//
#define MIN_POOL_SHIFT  6
#define MIN_POOL_SIZE   (1 << MIN_POOL_SHIFT)

//
// MAX_POOL_SHIFT must not be less than EFI_PAGE_SHIFT - 1
//
#define MAX_POOL_SHIFT  (EFI_PAGE_SHIFT - 1)
#define MAX_POOL_SIZE   (1 << MAX_POOL_SHIFT)

//
// MAX_POOL_INDEX are calculated by maximum and minimum pool sizes
//
#define MAX_POOL_INDEX  (MAX_POOL_SHIFT - MIN_POOL_SHIFT + 1)

typedef struct {
  UINTN        Size;
  BOOLEAN      Available;
} POOL_HEADER;

typedef struct {
  POOL_HEADER  Header;
  LIST_ENTRY   Link;
} FREE_POOL_HEADER;

extern LIST_ENTRY  mSmmPoolLists[MAX_POOL_INDEX];

#endif