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/** @file
SMM CPU I/O protocol as defined in the Intel Framework specification.
This protocol provides CPU I/O and memory access within SMM.
Copyright (c) 2009 - 2010, Intel Corporation. All rights reserved<BR>
This program and the accompanying materials are licensed and made available under
the terms and conditions of the BSD License that 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.
**/
#ifndef _SMM_CPU_IO_H_
#define _SMM_CPU_IO_H_
#include <Protocol/SmmCpuIo2.h>
#define EFI_SMM_CPU_IO_GUID \
{ \
0x5f439a0b, 0x45d8, 0x4682, {0xa4, 0xf4, 0xf0, 0x57, 0x6b, 0x51, 0x34, 0x41} \
}
typedef struct _EFI_SMM_CPU_IO_INTERFACE EFI_SMM_CPU_IO_INTERFACE;
/**
Provides the basic memory and I/O interfaces used to abstract 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.
@param[in] This The EFI_SMM_CPU_IO_INTERFACE instance.
@param[in] Width Signifies the width of the I/O operations.
@param[in] Address The base address of the I/O operations. The caller is
responsible for aligning the Address, if required.
@param[in] Count The number of I/O operations to perform.
@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 device.
@retval EFI_UNSUPPORTED The Address is not valid for this system.
@retval EFI_INVALID_PARAMETER Width or Count, or both, were invalid.
@retval EFI_OUT_OF_RESOURCES The request could not be completed due to a lack
of resources.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_SMM_CPU_IO)(
IN EFI_SMM_CPU_IO_INTERFACE *This,
IN EFI_SMM_IO_WIDTH Width,
IN UINT64 Address,
IN UINTN Count,
IN OUT VOID *Buffer
);
typedef struct {
///
/// This service provides the various modalities of memory and I/O read.
///
EFI_SMM_CPU_IO Read;
///
/// This service provides the various modalities of memory and I/O write.
///
EFI_SMM_CPU_IO Write;
} EFI_SMM_IO_ACCESS;
///
/// SMM CPU I/O Protocol provides CPU I/O and memory access within SMM.
///
struct _EFI_SMM_CPU_IO_INTERFACE {
///
/// Allows reads and writes to memory-mapped I/O space.
///
EFI_SMM_IO_ACCESS Mem;
///
/// Allows reads and writes to I/O space.
///
EFI_SMM_IO_ACCESS Io;
};
extern EFI_GUID gEfiSmmCpuIoGuid;
#endif
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