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/** @file
SMM CPU I/O protocol as defined in the PI 1.2 specification.
This protocol provides CPU I/O and memory access within SMM.
Copyright (c) 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.
**/
#ifndef _SMM_CPU_IO_H_
#define _SMM_CPU_IO_H_
///
/// Note:
/// To avoid name conflict between PI and Framework SMM spec, the following names defined
/// in PI 1.2 SMM spec are renamed. These renamings are not yet in a public PI spec and errta.
///
/// EFI_SMM_CPU_IO -> EFI_SMM_CPU_IO2
/// EFI_SMM_IO_ACCESS -> EFI_SMM_IO_ACCESS2
///
#define EFI_SMM_CPU_IO_PROTOCOL_GUID \
{ \
0x3242A9D8, 0xCE70, 0x4AA0, { 0x95, 0x5D, 0x5E, 0x7B, 0x14, 0x0D, 0xE4, 0xD2 } \
}
typedef struct _EFI_SMM_CPU_IO_PROTOCOL EFI_SMM_CPU_IO_PROTOCOL;
///
/// Width of the SMM CPU I/O operations
///
typedef enum {
SMM_IO_UINT8 = 0,
SMM_IO_UINT16 = 1,
SMM_IO_UINT32 = 2,
SMM_IO_UINT64 = 3
} EFI_SMM_IO_WIDTH;
/**
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.
@param[in] This The EFI_SMM_CPU_IO_PROTOCOL 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_IO2)(
IN CONST EFI_SMM_CPU_IO_PROTOCOL *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_IO2 Read;
///
/// This service provides the various modalities of memory and I/O write.
///
EFI_SMM_CPU_IO2 Write;
} EFI_SMM_IO_ACCESS2;
///
/// SMM CPU I/O Protocol provides CPU I/O and memory access within SMM.
///
struct _EFI_SMM_CPU_IO_PROTOCOL {
EFI_SMM_IO_ACCESS2 Mem; ///< Allows reads and writes to memory-mapped I/O space.
EFI_SMM_IO_ACCESS2 Io; ///< Allows reads and writes to I/O space.
};
extern EFI_GUID gEfiSmmCpuIoProtocolGuid;
#endif
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