Add into MdePkg definitions for the SMM Sx Dispatch Protocol as defined in PI 1.2...

[mirror_edk2.git] / MdePkg / Include / Protocol / SmmCpuIo.h

/** @file\r
  SMM CPU I/O protocol as defined in the PI 1.2 specification.\r
\r
  This protocol provides CPU I/O and memory access within SMM.\r
\r
  Copyright (c) 2009, Intel Corporation\r
  All rights reserved. This program and the accompanying materials\r
  are licensed and made available under the terms and conditions of the BSD License\r
  which accompanies this distribution.  The full text of the license may be found at\r
  http://opensource.org/licenses/bsd-license.php\r
\r
  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
**/\r
\r
#ifndef _SMM_CPU_IO_H_\r
#define _SMM_CPU_IO_H_\r
\r
#define EFI_SMM_CPU_IO_PROTOCOL_GUID \\r
  { \\r
    0x3242A9D8, 0xCE70, 0x4AA0, { 0x95, 0x5D, 0x5E, 0x7B, 0x14, 0x0D, 0xE4, 0xD2 } \\r
  }\r
\r
typedef struct _EFI_SMM_CPU_IO_PROTOCOL  EFI_SMM_CPU_IO_PROTOCOL;\r
\r
///\r
/// Width of the SMM CPU I/O operations\r
///\r
typedef enum {\r
  SMM_IO_UINT8  = 0,\r
  SMM_IO_UINT16 = 1,\r
  SMM_IO_UINT32 = 2,\r
  SMM_IO_UINT64 = 3\r
} EFI_SMM_IO_WIDTH;\r
\r
/**\r
  Provides the basic memory and I/O interfaces used toabstract accesses to devices.\r
\r
  The I/O operations are carried out exactly as requested.  The caller is responsible for any alignment \r
  and I/O width issues that the bus, device, platform, or type of I/O might require.\r
\r
  @param[in]      This           The EFI_SMM_CPU_IO_PROTOCOL instance.\r
  @param[in]      Width          Signifies the width of the I/O operations.\r
  @param[in]      Address        The base address of the I/O operations.\r
                                 The caller is responsible for aligning the Address if required. \r
  @param[in]      Count          The number of I/O operations to perform.\r
  @param[in,out]  Buffer         For read operations, the destination buffer to store the results.\r
                                 For write operations, the source buffer from which to write data.\r
\r
  @retval EFI_SUCCESS            The data was read from or written to the device.\r
  @retval EFI_UNSUPPORTED        The Address is not valid for this system.\r
  @retval EFI_INVALID_PARAMETER  Width or Count, or both, were invalid.\r
  @retval EFI_OUT_OF_RESOURCES   The request could not be completed due to a lack of resources.\r
**/\r
typedef\r
EFI_STATUS\r
(EFIAPI *EFI_SMM_CPU_IO)(\r
  IN CONST EFI_SMM_CPU_IO_PROTOCOL  *This,\r
  IN EFI_SMM_IO_WIDTH               Width,\r
  IN UINT64                         Address,\r
  IN UINTN                          Count,\r
  IN OUT VOID                       *Buffer\r
  );\r
\r
typedef struct {\r
  ///\r
  /// This service provides the various modalities of memory and I/O read.\r
  ///\r
  EFI_SMM_CPU_IO  Read;\r
  ///\r
  /// This service provides the various modalities of memory and I/O write.\r
  ///\r
  EFI_SMM_CPU_IO  Write;\r
} EFI_SMM_IO_ACCESS;\r
\r
///\r
/// SMM CPU I/O Protocol provides CPU I/O and memory access within SMM.\r
///\r
typedef struct _EFI_SMM_CPU_IO_PROTOCOL {\r
  EFI_SMM_IO_ACCESS Mem;  ///< Allows reads and writes to memory-mapped I/O space.\r
  EFI_SMM_IO_ACCESS Io;   ///< Allows reads and writes to I/O space.\r
};\r
\r
extern EFI_GUID gEfiSmmCpuIoProtocolGuid;\r
\r
#endif\r