2 SMM CPU I/O protocol as defined in the PI 1.2 specification.
4 This protocol provides CPU I/O and memory access within SMM.
6 Copyright (c) 2009, Intel Corporation
7 All rights reserved. This program and the accompanying materials
8 are licensed and made available under the terms and conditions of the BSD License
9 which accompanies this distribution. The full text of the license may be found at
10 http://opensource.org/licenses/bsd-license.php
12 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
13 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
17 #ifndef _SMM_CPU_IO_H_
18 #define _SMM_CPU_IO_H_
20 #define EFI_SMM_CPU_IO_PROTOCOL_GUID \
22 0x3242A9D8, 0xCE70, 0x4AA0, { 0x95, 0x5D, 0x5E, 0x7B, 0x14, 0x0D, 0xE4, 0xD2 } \
25 typedef struct _EFI_SMM_CPU_IO_PROTOCOL EFI_SMM_CPU_IO_PROTOCOL
;
28 /// Width of the SMM CPU I/O operations
38 Provides the basic memory and I/O interfaces used toabstract accesses to devices.
40 The I/O operations are carried out exactly as requested. The caller is responsible for any alignment
41 and I/O width issues that the bus, device, platform, or type of I/O might require.
43 @param[in] This The EFI_SMM_CPU_IO_PROTOCOL instance.
44 @param[in] Width Signifies the width of the I/O operations.
45 @param[in] Address The base address of the I/O operations.
46 The caller is responsible for aligning the Address if required.
47 @param[in] Count The number of I/O operations to perform.
48 @param[in,out] Buffer For read operations, the destination buffer to store the results.
49 For write operations, the source buffer from which to write data.
51 @retval EFI_SUCCESS The data was read from or written to the device.
52 @retval EFI_UNSUPPORTED The Address is not valid for this system.
53 @retval EFI_INVALID_PARAMETER Width or Count, or both, were invalid.
54 @retval EFI_OUT_OF_RESOURCES The request could not be completed due to a lack of resources.
58 (EFIAPI
*EFI_SMM_CPU_IO
)(
59 IN CONST EFI_SMM_CPU_IO_PROTOCOL
*This
,
60 IN EFI_SMM_IO_WIDTH Width
,
68 /// This service provides the various modalities of memory and I/O read.
72 /// This service provides the various modalities of memory and I/O write.
78 /// SMM CPU I/O Protocol provides CPU I/O and memory access within SMM.
80 typedef struct _EFI_SMM_CPU_IO_PROTOCOL
{
81 EFI_SMM_IO_ACCESS Mem
; ///< Allows reads and writes to memory-mapped I/O space.
82 EFI_SMM_IO_ACCESS Io
; ///< Allows reads and writes to I/O space.
85 extern EFI_GUID gEfiSmmCpuIoProtocolGuid
;