0e0eeecad4
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@8871 6f19259b-4bc3-4df7-8a09-765794883524
110 lines
3.7 KiB
C
110 lines
3.7 KiB
C
/** @file
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This code abstracts the CPU IO Protocol which installed by some platform or chipset-specific
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PEIM that abstracts the processor-visible I/O operations.
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Copyright (c) 2007 - 2009, Intel Corporation
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All rights reserved. This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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@par Revision Reference:
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CPU IO Protocol is defined in Framework of EFI CPU IO Protocol Spec
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Version 0.9
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**/
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#ifndef _CPUIO_H_
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#define _CPUIO_H_
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#define EFI_CPU_IO_PROTOCOL_GUID \
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{ \
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0xB0732526, 0x38C8, 0x4b40, {0x88, 0x77, 0x61, 0xC7, 0xB0, 0x6A, 0xAC, 0x45 } \
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}
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typedef struct _EFI_CPU_IO_PROTOCOL EFI_CPU_IO_PROTOCOL;
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///
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/// Enumeration that defines the width of the I/O operation.
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///
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typedef enum {
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EfiCpuIoWidthUint8,
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EfiCpuIoWidthUint16,
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EfiCpuIoWidthUint32,
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EfiCpuIoWidthUint64,
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EfiCpuIoWidthFifoUint8,
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EfiCpuIoWidthFifoUint16,
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EfiCpuIoWidthFifoUint32,
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EfiCpuIoWidthFifoUint64,
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EfiCpuIoWidthFillUint8,
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EfiCpuIoWidthFillUint16,
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EfiCpuIoWidthFillUint32,
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EfiCpuIoWidthFillUint64,
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EfiCpuIoWidthMaximum
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} EFI_CPU_IO_PROTOCOL_WIDTH;
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/**
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Enables a driver to access memory-mapped registers in the EFI system memory space.
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Or, Enables a driver to access registers in the EFI CPU I/O space.
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@param[in] This A pointer to the EFI_CPU_IO_PROTOCOL instance.
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@param[in] Width Signifies the width of the I/O or Memory operation.
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@param[in] Address The base address of the I/O or Memoryoperation.
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@param[in] Count The number of I/O or Memory operations to perform.
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The number of bytes moved is Width size * Count, starting at Address.
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@param[in, out] Buffer For read operations, the destination buffer to store the results.
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For write operations, the source buffer from which to write data.
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@retval EFI_SUCCESS The data was read from or written to the EFI system.
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@retval EFI_INVALID_PARAMETER Width is invalid for this EFI system.Or Buffer is NULL.
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@retval EFI_UNSUPPORTED The Buffer is not aligned for the given Width.
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Or,The address range specified by Address, Width, and Count is not valid for this EFI system.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_CPU_IO_PROTOCOL_IO_MEM)(
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IN EFI_CPU_IO_PROTOCOL *This,
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IN EFI_CPU_IO_PROTOCOL_WIDTH Width,
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IN UINT64 Address,
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IN UINTN Count,
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IN OUT VOID *Buffer
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);
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///
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/// Servies for read and write accesses.
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///
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typedef struct {
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///
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/// This service provides the various modalities of memory and I/O read.
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///
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EFI_CPU_IO_PROTOCOL_IO_MEM Read;
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///
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/// This service provides the various modalities of memory and I/O write.
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///
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EFI_CPU_IO_PROTOCOL_IO_MEM Write;
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} EFI_CPU_IO_PROTOCOL_ACCESS;
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///
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/// Provides the basic memory and I/O interfaces that are used to abstract
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/// accesses to devices in a system.
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///
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struct _EFI_CPU_IO_PROTOCOL {
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///
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/// Enables a driver to access memory-mapped registers in the EFI system memory space.
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///
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EFI_CPU_IO_PROTOCOL_ACCESS Mem;
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///
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/// Enables a driver to access registers in the EFI CPU I/O space.
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///
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EFI_CPU_IO_PROTOCOL_ACCESS Io;
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};
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extern EFI_GUID gEfiCpuIoProtocolGuid;
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#endif
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