MdePkg/Include/Protocol/MmSxDispatch.h

/** @file
  MM Sx Dispatch Protocol as defined in PI 1.5 Specification
  Volume 4 Management Mode Core Interface.

  Provides the parent dispatch service for a given Sx-state source generator.

  Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
  SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#ifndef _MM_SX_DISPATCH_H_
#define _MM_SX_DISPATCH_H_

#include <Pi/PiMmCis.h>

#define EFI_MM_SX_DISPATCH_PROTOCOL_GUID \
  { \
    0x456d2859, 0xa84b, 0x4e47, {0xa2, 0xee, 0x32, 0x76, 0xd8, 0x86, 0x99, 0x7d } \
  }

///
/// Sleep states S0-S5
///
typedef enum {
  SxS0,
  SxS1,
  SxS2,
  SxS3,
  SxS4,
  SxS5,
  EfiMaximumSleepType
} EFI_SLEEP_TYPE;

///
/// Sleep state phase: entry or exit
///
typedef enum {
  SxEntry,
  SxExit,
  EfiMaximumPhase
} EFI_SLEEP_PHASE;

///
/// The dispatch function's context
///
typedef struct {
  EFI_SLEEP_TYPE     Type;
  EFI_SLEEP_PHASE    Phase;
} EFI_MM_SX_REGISTER_CONTEXT;

typedef struct _EFI_MM_SX_DISPATCH_PROTOCOL EFI_MM_SX_DISPATCH_PROTOCOL;

/**
  Provides the parent dispatch service for a given Sx source generator.

  This service registers a function (DispatchFunction) which will be called when the sleep state
  event specified by RegisterContext is detected. On return, DispatchHandle contains a
  unique handle which may be used later to unregister the function using UnRegister().
  The DispatchFunction will be called with Context set to the same value as was passed into
  this function in RegisterContext and with CommBuffer and CommBufferSize set to
  NULL and 0 respectively.

  @param[in] This                Pointer to the EFI_MM_SX_DISPATCH_PROTOCOL instance.
  @param[in] DispatchFunction    Function to register for handler when the specified sleep state event occurs.
  @param[in] RegisterContext     Pointer to the dispatch function's context.
                                 The caller fills this context in before calling
                                 the register function to indicate to the register
                                 function which Sx state type and phase the caller
                                 wishes to be called back on. For this intertace,
                                 the Sx driver will call the registered handlers for
                                 all Sx type and phases, so the Sx state handler(s)
                                 must check the Type and Phase field of the Dispatch
                                 context and act accordingly.
  @param[out]  DispatchHandle    Handle of dispatch function, for when interfacing
                                 with the parent Sx state MM driver.

  @retval EFI_SUCCESS            The dispatch function has been successfully
                                 registered and the MMI source has been enabled.
  @retval EFI_UNSUPPORTED        The Sx driver or hardware does not support that
                                 Sx Type/Phase.
  @retval EFI_DEVICE_ERROR       The Sx driver was unable to enable the MMI source.
  @retval EFI_INVALID_PARAMETER  RegisterContext is invalid. Type & Phase are not
                                 within valid range.
  @retval EFI_OUT_OF_RESOURCES   There is not enough memory (system or MM) to manage this
                                 child.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_MM_SX_REGISTER)(
  IN  CONST EFI_MM_SX_DISPATCH_PROTOCOL  *This,
  IN        EFI_MM_HANDLER_ENTRY_POINT   DispatchFunction,
  IN  CONST EFI_MM_SX_REGISTER_CONTEXT   *RegisterContext,
  OUT       EFI_HANDLE                   *DispatchHandle
  );

/**
  Unregisters an Sx-state service.

  This service removes the handler associated with DispatchHandle so that it will no longer be
  called in response to sleep event.

  @param[in] This                Pointer to the EFI_MM_SX_DISPATCH_PROTOCOL instance.
  @param[in] DispatchHandle      Handle of the service to remove.

  @retval EFI_SUCCESS            The service has been successfully removed.
  @retval EFI_INVALID_PARAMETER  The DispatchHandle was not valid.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_MM_SX_UNREGISTER)(
  IN CONST EFI_MM_SX_DISPATCH_PROTOCOL  *This,
  IN       EFI_HANDLE                   DispatchHandle
  );

///
/// Interface structure for the MM Sx Dispatch Protocol
///
/// The EFI_MM_SX_DISPATCH_PROTOCOL provides the ability to install child handlers to
/// respond to sleep state related events.
///
struct _EFI_MM_SX_DISPATCH_PROTOCOL {
  EFI_MM_SX_REGISTER      Register;
  EFI_MM_SX_UNREGISTER    UnRegister;
};

extern EFI_GUID  gEfiMmSxDispatchProtocolGuid;

#endif