2 SMM CPU I/O protocol as defined in the Intel Framework specification.
4 This protocol provides CPU I/O and memory access within SMM.
6 Copyright (c) 2009 - 2010, Intel Corporation. All rights reserved.<BR>
7 This program and the accompanying materials are licensed and made available under
8 the terms and conditions of the BSD License that accompanies this distribution.
9 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 #include <Protocol/SmmCpuIo2.h>
22 #define EFI_SMM_CPU_IO_GUID \
24 0x5f439a0b, 0x45d8, 0x4682, {0xa4, 0xf4, 0xf0, 0x57, 0x6b, 0x51, 0x34, 0x41} \
27 typedef struct _EFI_SMM_CPU_IO_INTERFACE EFI_SMM_CPU_IO_INTERFACE
;
30 Provides the basic memory and I/O interfaces used to abstract accesses to devices.
32 The I/O operations are carried out exactly as requested. The caller is
33 responsible for any alignment and I/O width issues that the bus, device,
34 platform, or type of I/O might require.
36 @param[in] This The EFI_SMM_CPU_IO_INTERFACE instance.
37 @param[in] Width Signifies the width of the I/O operations.
38 @param[in] Address The base address of the I/O operations. The caller is
39 responsible for aligning the Address, if required.
40 @param[in] Count The number of I/O operations to perform.
41 @param[in,out] Buffer For read operations, the destination buffer to store
42 the results. For write operations, the source buffer
43 from which to write data.
45 @retval EFI_SUCCESS The data was read from or written to the device.
46 @retval EFI_UNSUPPORTED The Address is not valid for this system.
47 @retval EFI_INVALID_PARAMETER Width or Count, or both, were invalid.
48 @retval EFI_OUT_OF_RESOURCES The request could not be completed due to a lack
53 (EFIAPI
*EFI_SMM_CPU_IO
)(
54 IN EFI_SMM_CPU_IO_INTERFACE
*This
,
55 IN EFI_SMM_IO_WIDTH Width
,
63 /// This service provides the various modalities of memory and I/O read.
67 /// This service provides the various modalities of memory and I/O write.
73 /// SMM CPU I/O Protocol provides CPU I/O and memory access within SMM.
75 struct _EFI_SMM_CPU_IO_INTERFACE
{
77 /// Allows reads and writes to memory-mapped I/O space.
79 EFI_SMM_IO_ACCESS Mem
;
81 /// Allows reads and writes to I/O space.
86 extern EFI_GUID gEfiSmmCpuIoGuid
;