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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 - 2018, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#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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