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 - 2018, Intel Corporation. All rights reserved.<BR>
7 SPDX-License-Identifier: BSD-2-Clause-Patent
11 #ifndef _SMM_CPU_IO_H_
12 #define _SMM_CPU_IO_H_
14 #include <Protocol/SmmCpuIo2.h>
16 #define EFI_SMM_CPU_IO_GUID \
18 0x5f439a0b, 0x45d8, 0x4682, {0xa4, 0xf4, 0xf0, 0x57, 0x6b, 0x51, 0x34, 0x41} \
21 typedef struct _EFI_SMM_CPU_IO_INTERFACE EFI_SMM_CPU_IO_INTERFACE
;
24 Provides the basic memory and I/O interfaces used to abstract accesses to devices.
26 The I/O operations are carried out exactly as requested. The caller is
27 responsible for any alignment and I/O width issues that the bus, device,
28 platform, or type of I/O might require.
30 @param[in] This The EFI_SMM_CPU_IO_INTERFACE instance.
31 @param[in] Width Signifies the width of the I/O operations.
32 @param[in] Address The base address of the I/O operations. The caller is
33 responsible for aligning the Address, if required.
34 @param[in] Count The number of I/O operations to perform.
35 @param[in,out] Buffer For read operations, the destination buffer to store
36 the results. For write operations, the source buffer
37 from which to write data.
39 @retval EFI_SUCCESS The data was read from or written to the device.
40 @retval EFI_UNSUPPORTED The Address is not valid for this system.
41 @retval EFI_INVALID_PARAMETER Width or Count, or both, were invalid.
42 @retval EFI_OUT_OF_RESOURCES The request could not be completed due to a lack
47 (EFIAPI
*EFI_SMM_CPU_IO
)(
48 IN EFI_SMM_CPU_IO_INTERFACE
*This
,
49 IN EFI_SMM_IO_WIDTH Width
,
57 /// This service provides the various modalities of memory and I/O read.
61 /// This service provides the various modalities of memory and I/O write.
67 /// SMM CPU I/O Protocol provides CPU I/O and memory access within SMM.
69 struct _EFI_SMM_CPU_IO_INTERFACE
{
71 /// Allows reads and writes to memory-mapped I/O space.
73 EFI_SMM_IO_ACCESS Mem
;
75 /// Allows reads and writes to I/O space.
80 extern EFI_GUID gEfiSmmCpuIoGuid
;