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/** @file
This code abstracts the CPU IO Protocol which installed by some platform or chipset-specific
PEIM that abstracts the processor-visible I/O operations.
Copyright (c) 2007 - 2009, Intel Corporation
All rights reserved. This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
@par Revision Reference:
CPU IO Protocol is defined in Framework of EFI CPU IO Protocol Spec
Version 0.9
**/
#ifndef _CPUIO_H_
#define _CPUIO_H_
#define EFI_CPU_IO_PROTOCOL_GUID \
{ \
0xB0732526, 0x38C8, 0x4b40, {0x88, 0x77, 0x61, 0xC7, 0xB0, 0x6A, 0xAC, 0x45 } \
}
typedef struct _EFI_CPU_IO_PROTOCOL EFI_CPU_IO_PROTOCOL;
///
/// Enumeration that defines the width of the I/O operation.
///
typedef enum {
EfiCpuIoWidthUint8,
EfiCpuIoWidthUint16,
EfiCpuIoWidthUint32,
EfiCpuIoWidthUint64,
EfiCpuIoWidthFifoUint8,
EfiCpuIoWidthFifoUint16,
EfiCpuIoWidthFifoUint32,
EfiCpuIoWidthFifoUint64,
EfiCpuIoWidthFillUint8,
EfiCpuIoWidthFillUint16,
EfiCpuIoWidthFillUint32,
EfiCpuIoWidthFillUint64,
EfiCpuIoWidthMaximum
} EFI_CPU_IO_PROTOCOL_WIDTH;
/**
Enables a driver to access memory-mapped registers in the EFI system memory space.
Or, Enables a driver to access registers in the EFI CPU I/O space.
@param[in] This A pointer to the EFI_CPU_IO_PROTOCOL instance.
@param[in] Width Signifies the width of the I/O or Memory operation.
@param[in] Address The base address of the I/O or Memoryoperation.
@param[in] Count The number of I/O or Memory operations to perform.
The number of bytes moved is Width size * Count, starting at Address.
@param[in, out] Buffer For read operations, the destination buffer to store the results.
For write operations, the source buffer from which to write data.
@retval EFI_SUCCESS The data was read from or written to the EFI system.
@retval EFI_INVALID_PARAMETER Width is invalid for this EFI system.Or Buffer is NULL.
@retval EFI_UNSUPPORTED The Buffer is not aligned for the given Width.
Or,The address range specified by Address, Width, and Count is not valid for this EFI system.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_CPU_IO_PROTOCOL_IO_MEM)(
IN EFI_CPU_IO_PROTOCOL *This,
IN EFI_CPU_IO_PROTOCOL_WIDTH Width,
IN UINT64 Address,
IN UINTN Count,
IN OUT VOID *Buffer
);
///
/// Servies for read and write accesses.
///
typedef struct {
///
/// This service provides the various modalities of memory and I/O read.
///
EFI_CPU_IO_PROTOCOL_IO_MEM Read;
///
/// This service provides the various modalities of memory and I/O write.
///
EFI_CPU_IO_PROTOCOL_IO_MEM Write;
} EFI_CPU_IO_PROTOCOL_ACCESS;
///
/// Provides the basic memory and I/O interfaces that are used to abstract
/// accesses to devices in a system.
///
struct _EFI_CPU_IO_PROTOCOL {
///
/// Enables a driver to access memory-mapped registers in the EFI system memory space.
///
EFI_CPU_IO_PROTOCOL_ACCESS Mem;
///
/// Enables a driver to access registers in the EFI CPU I/O space.
///
EFI_CPU_IO_PROTOCOL_ACCESS Io;
};
extern EFI_GUID gEfiCpuIoProtocolGuid;
#endif
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