MmCpuIo.h File Reference

Data Structures
struct	EFI_MM_IO_ACCESS
struct	_EFI_MM_CPU_IO_PROTOCOL

Macros
#define	EFI_MM_CPU_IO_PROTOCOL_GUID

Typedefs
typedef struct _EFI_MM_CPU_IO_PROTOCOL	EFI_MM_CPU_IO_PROTOCOL
typedef EFI_STATUS(EFIAPI *	EFI_MM_CPU_IO )(IN CONST EFI_MM_CPU_IO_PROTOCOL *This, IN EFI_MM_IO_WIDTH Width, IN UINT64 Address, IN UINTN Count, IN OUT VOID *Buffer)

Enumerations
enum	EFI_MM_IO_WIDTH { MM_IO_UINT8 = 0, MM_IO_UINT16 = 1, MM_IO_UINT32 = 2, MM_IO_UINT64 = 3 }

Variables
EFI_GUID	gEfiMmCpuIoProtocolGuid

Detailed Description

MM CPU I/O 2 protocol as defined in the PI 1.5 specification.

This protocol provides CPU I/O and memory access within MM.

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

Macro Definition Documentation

#define EFI_MM_CPU_IO_PROTOCOL_GUID

Value:

{ \
    0x3242A9D8, 0xCE70, 0x4AA0, { 0x95, 0x5D, 0x5E, 0x7B, 0x14, 0x0D, 0xE4, 0xD2 } \
  }

Typedef Documentation

typedef EFI_STATUS(EFIAPI * EFI_MM_CPU_IO)(IN CONST EFI_MM_CPU_IO_PROTOCOL *This, IN EFI_MM_IO_WIDTH Width, IN UINT64 Address, IN UINTN Count, IN OUT VOID *Buffer)

Provides the basic memory and I/O interfaces used toabstract accesses to devices.

The I/O operations are carried out exactly as requested. The caller is responsible for any alignment and I/O width issues that the bus, device, platform, or type of I/O might require.

Parameters

[in]	This	The EFI_MM_CPU_IO_PROTOCOL instance.
[in]	Width	Signifies the width of the I/O operations.
[in]	Address	The base address of the I/O operations. The caller is responsible for aligning the Address if required.
[in]	Count	The number of I/O operations to perform.
[in,out]	Buffer	For read operations, the destination buffer to store the results. For write operations, the source buffer from which to write data.

Return values

EFI_SUCCESS	The data was read from or written to the device.
EFI_UNSUPPORTED	The Address is not valid for this system.
EFI_INVALID_PARAMETER	Width or Count, or both, were invalid.
EFI_OUT_OF_RESOURCES	The request could not be completed due to a lack of resources.

typedef struct _EFI_MM_CPU_IO_PROTOCOL EFI_MM_CPU_IO_PROTOCOL

Enumeration Type Documentation

enum EFI_MM_IO_WIDTH

Width of the MM CPU I/O operations

Enumerator
MM_IO_UINT8
MM_IO_UINT16
MM_IO_UINT32
MM_IO_UINT64

Variable Documentation

EFI_GUID gEfiMmCpuIoProtocolGuid