/** @file
Include file for SMM CPU Services protocol implementation.

Copyright (c) 2011 - 2015, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#ifndef _CPU_SERVICE_H_
#define _CPU_SERVICE_H_

typedef enum {
  SmmCpuNone,
  SmmCpuAdd,
  SmmCpuRemove,
  SmmCpuSwitchBsp
} SMM_CPU_OPERATION;

//
// SMM CPU Service Protocol function prototypes.
//

/**
  Gets processor information on the requested processor at the instant this call is made.

  @param[in]  This                 A pointer to the EFI_SMM_CPU_SERVICE_PROTOCOL instance.
  @param[in]  ProcessorNumber      The handle number of processor.
  @param[out] ProcessorInfoBuffer  A pointer to the buffer where information for
                                   the requested processor is deposited.

  @retval EFI_SUCCESS             Processor information was returned.
  @retval EFI_INVALID_PARAMETER   ProcessorInfoBuffer is NULL.
  @retval EFI_INVALID_PARAMETER   ProcessorNumber is invalid.
  @retval EFI_NOT_FOUND           The processor with the handle specified by
                                  ProcessorNumber does not exist in the platform.

**/
EFI_STATUS
EFIAPI
SmmGetProcessorInfo (
  IN CONST EFI_SMM_CPU_SERVICE_PROTOCOL  *This,
  IN       UINTN                         ProcessorNumber,
  OUT      EFI_PROCESSOR_INFORMATION     *ProcessorInfoBuffer
  );

/**
  This service switches the requested AP to be the BSP since the next SMI.

  @param[in] This             A pointer to the EFI_SMM_CPU_SERVICE_PROTOCOL instance.
  @param[in] ProcessorNumber  The handle number of AP that is to become the new BSP.

  @retval EFI_SUCCESS             BSP will be switched in next SMI.
  @retval EFI_UNSUPPORTED         Switching the BSP or a processor to be hot-removed is not supported.
  @retval EFI_NOT_FOUND           The processor with the handle specified by ProcessorNumber does not exist.
  @retval EFI_INVALID_PARAMETER   ProcessorNumber is invalid.
**/
EFI_STATUS
EFIAPI
SmmSwitchBsp (
  IN CONST EFI_SMM_CPU_SERVICE_PROTOCOL  *This,
  IN       UINTN                         ProcessorNumber
  );

/**
  Notify that a processor was hot-added.

  @param[in] This                A pointer to the EFI_SMM_CPU_SERVICE_PROTOCOL instance.
  @param[in] ProcessorId         Local APIC ID of the hot-added processor.
  @param[out] ProcessorNumber    The handle number of the hot-added processor.

  @retval EFI_SUCCESS            The hot-addition of the specified processors was successfully notified.
  @retval EFI_UNSUPPORTED        Hot addition of processor is not supported.
  @retval EFI_NOT_FOUND          The processor with the handle specified by ProcessorNumber does not exist.
  @retval EFI_INVALID_PARAMETER  ProcessorNumber is invalid.
  @retval EFI_ALREADY_STARTED    The processor is already online in the system.
**/
EFI_STATUS
EFIAPI
SmmAddProcessor (
  IN CONST EFI_SMM_CPU_SERVICE_PROTOCOL  *This,
  IN       UINT64                        ProcessorId,
  OUT      UINTN                         *ProcessorNumber
  );

/**
  Notify that a processor was hot-removed.

  @param[in] This                A pointer to the EFI_SMM_CPU_SERVICE_PROTOCOL instance.
  @param[in] ProcessorNumber     The handle number of the hot-added processor.

  @retval EFI_SUCCESS            The hot-removal of the specified processors was successfully notified.
  @retval EFI_UNSUPPORTED        Hot removal of processor is not supported.
  @retval EFI_UNSUPPORTED        Hot removal of BSP is not supported.
  @retval EFI_UNSUPPORTED        Hot removal of a processor with pending hot-plug operation is not supported.
  @retval EFI_INVALID_PARAMETER  ProcessorNumber is invalid.
**/
EFI_STATUS
EFIAPI
SmmRemoveProcessor (
  IN CONST EFI_SMM_CPU_SERVICE_PROTOCOL  *This,
  IN       UINTN                         ProcessorNumber
  );

/**
  This return the handle number for the calling processor.

  @param[in] This                 A pointer to the EFI_SMM_CPU_SERVICE_PROTOCOL instance.
  @param[out] ProcessorNumber      The handle number of currently executing processor.

  @retval EFI_SUCCESS             The current processor handle number was returned
                                  in ProcessorNumber.
  @retval EFI_INVALID_PARAMETER   ProcessorNumber is NULL.

**/
EFI_STATUS
EFIAPI
SmmWhoAmI (
  IN CONST EFI_SMM_CPU_SERVICE_PROTOCOL  *This,
  OUT      UINTN                         *ProcessorNumber
  );

/**
  Register exception handler.

  @param  This                  A pointer to the SMM_CPU_SERVICE_PROTOCOL instance.
  @param  ExceptionType         Defines which interrupt or exception to hook. Type EFI_EXCEPTION_TYPE and
                                the valid values for this parameter are defined in EFI_DEBUG_SUPPORT_PROTOCOL
                                of the UEFI 2.0 specification.
  @param  InterruptHandler      A pointer to a function of type EFI_CPU_INTERRUPT_HANDLER
                                that is called when a processor interrupt occurs.
                                If this parameter is NULL, then the handler will be uninstalled.

  @retval EFI_SUCCESS           The handler for the processor interrupt was successfully installed or uninstalled.
  @retval EFI_ALREADY_STARTED   InterruptHandler is not NULL, and a handler for InterruptType was previously installed.
  @retval EFI_INVALID_PARAMETER InterruptHandler is NULL, and a handler for InterruptType was not previously installed.
  @retval EFI_UNSUPPORTED       The interrupt specified by InterruptType is not supported.

**/
EFI_STATUS
EFIAPI
SmmRegisterExceptionHandler (
  IN EFI_SMM_CPU_SERVICE_PROTOCOL  *This,
  IN EFI_EXCEPTION_TYPE            ExceptionType,
  IN EFI_CPU_INTERRUPT_HANDLER     InterruptHandler
  );

//
// Internal function prototypes
//

/**
  Update the SMM CPU list per the pending operation.

  This function is called after return from SMI handlers.
**/
VOID
SmmCpuUpdate (
  VOID
  );

/**
  Initialize SMM CPU Services.

  It installs EFI SMM CPU Services Protocol.

  @param ImageHandle The firmware allocated handle for the EFI image.

  @retval EFI_SUCCESS    EFI SMM CPU Services Protocol was installed successfully.
**/
EFI_STATUS
InitializeSmmCpuServices (
  IN EFI_HANDLE  Handle
  );

#endif
