OvmfPkg/Csm/Include/Protocol/LegacyInterrupt.h

/** @file
  This protocol abstracts the PIRQ programming from the generic EFI Compatibility Support Modules (CSMs).

Copyright (c) 2007 - 2018, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent

  @par Revision Reference:
  This protocol is defined in Framework for the EFI Compatibility Support Module specification.
  Version 0.97.

**/

#ifndef _EFI_LEGACY_INTERRUPT_H_
#define _EFI_LEGACY_INTERRUPT_H_

#define EFI_LEGACY_INTERRUPT_PROTOCOL_GUID \
  { \
    0x31ce593d, 0x108a, 0x485d, {0xad, 0xb2, 0x78, 0xf2, 0x1f, 0x29, 0x66, 0xbe } \
  }

typedef struct _EFI_LEGACY_INTERRUPT_PROTOCOL EFI_LEGACY_INTERRUPT_PROTOCOL;

/**
  Get the number of PIRQs this hardware supports.

  @param  This                  The protocol instance pointer.
  @param  NumberPirsq           The number of PIRQs that are supported.

  @retval EFI_SUCCESS           The number of PIRQs was returned successfully.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_LEGACY_INTERRUPT_GET_NUMBER_PIRQS)(
  IN EFI_LEGACY_INTERRUPT_PROTOCOL            *This,
  OUT UINT8                                   *NumberPirqs
  );

/**
  Gets the PCI location associated with this protocol.

  @param  This                  The Protocol instance pointer.
  @param  Bus                   The PCI Bus.
  @param  Device                The PCI Device.
  @param  Function              The PCI Function.

  @retval EFI_SUCCESS           The Bus, Device, and Function were returned successfully.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_LEGACY_INTERRUPT_GET_LOCATION)(
  IN EFI_LEGACY_INTERRUPT_PROTOCOL            *This,
  OUT UINT8                                   *Bus,
  OUT UINT8                                   *Device,
  OUT UINT8                                   *Function
  );

/**
  Read the PIRQ register and return the data

  @param  This                  The protocol instance pointer.
  @param  PirqNumber            The PIRQ register to read.
  @param  PirqData              The data read.

  @retval EFI_SUCCESS           The data was read.
  @retval EFI_INVALID_PARAMETER Invalid PIRQ number.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_LEGACY_INTERRUPT_READ_PIRQ)(
  IN EFI_LEGACY_INTERRUPT_PROTOCOL           *This,
  IN  UINT8                                  PirqNumber,
  OUT UINT8                                  *PirqData
  );

/**
  Write the specified PIRQ register with the given data.

  @param  This                  The protocol instance pointer.
  @param  PirqNumber            A PIRQ register to read.
  @param  PirqData              The data to write.

  @retval EFI_SUCCESS           The PIRQ was programmed.
  @retval EFI_INVALID_PARAMETER Invalid PIRQ number.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_LEGACY_INTERRUPT_WRITE_PIRQ)(
  IN EFI_LEGACY_INTERRUPT_PROTOCOL           *This,
  IN  UINT8                                  PirqNumber,
  IN UINT8                                   PirqData
  );

struct _EFI_LEGACY_INTERRUPT_PROTOCOL {
  ///
  ///   Gets the number of PIRQs supported.
  ///
  EFI_LEGACY_INTERRUPT_GET_NUMBER_PIRQS    GetNumberPirqs;

  ///
  /// Gets the PCI bus, device, and function that is associated with this protocol.
  ///
  EFI_LEGACY_INTERRUPT_GET_LOCATION        GetLocation;

  ///
  /// Reads the indicated PIRQ register.
  ///
  EFI_LEGACY_INTERRUPT_READ_PIRQ           ReadPirq;

  ///
  /// Writes to the indicated PIRQ register.
  ///
  EFI_LEGACY_INTERRUPT_WRITE_PIRQ          WritePirq;
};

extern EFI_GUID  gEfiLegacyInterruptProtocolGuid;

#endif