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91 lines
2.8 KiB
C
91 lines
2.8 KiB
C
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/** @file
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MM CPU I/O 2 protocol as defined in the PI 1.5 specification.
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This protocol provides CPU I/O and memory access within MM.
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Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#ifndef _MM_CPU_IO_H_
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#define _MM_CPU_IO_H_
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#define EFI_MM_CPU_IO_PROTOCOL_GUID \
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{ \
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0x3242A9D8, 0xCE70, 0x4AA0, { 0x95, 0x5D, 0x5E, 0x7B, 0x14, 0x0D, 0xE4, 0xD2 } \
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}
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typedef struct _EFI_MM_CPU_IO_PROTOCOL EFI_MM_CPU_IO_PROTOCOL;
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///
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/// Width of the MM CPU I/O operations
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///
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typedef enum {
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MM_IO_UINT8 = 0,
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MM_IO_UINT16 = 1,
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MM_IO_UINT32 = 2,
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MM_IO_UINT64 = 3
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} EFI_MM_IO_WIDTH;
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/**
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Provides the basic memory and I/O interfaces used toabstract accesses to devices.
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The I/O operations are carried out exactly as requested. The caller is
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responsible for any alignment and I/O width issues that the bus, device,
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platform, or type of I/O might require.
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@param[in] This The EFI_MM_CPU_IO_PROTOCOL instance.
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@param[in] Width Signifies the width of the I/O operations.
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@param[in] Address The base address of the I/O operations. The caller is
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responsible for aligning the Address if required.
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@param[in] Count The number of I/O operations to perform.
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@param[in,out] Buffer For read operations, the destination buffer to store
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the results. For write operations, the source buffer
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from which to write data.
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@retval EFI_SUCCESS The data was read from or written to the device.
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@retval EFI_UNSUPPORTED The Address is not valid for this system.
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@retval EFI_INVALID_PARAMETER Width or Count, or both, were invalid.
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@retval EFI_OUT_OF_RESOURCES The request could not be completed due to a lack
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of resources.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_MM_CPU_IO)(
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IN CONST EFI_MM_CPU_IO_PROTOCOL *This,
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IN EFI_MM_IO_WIDTH Width,
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IN UINT64 Address,
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IN UINTN Count,
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IN OUT VOID *Buffer
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);
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typedef struct {
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///
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/// This service provides the various modalities of memory and I/O read.
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///
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EFI_MM_CPU_IO Read;
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///
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/// This service provides the various modalities of memory and I/O write.
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///
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EFI_MM_CPU_IO Write;
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} EFI_MM_IO_ACCESS;
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///
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/// MM CPU I/O Protocol provides CPU I/O and memory access within MM.
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///
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struct _EFI_MM_CPU_IO_PROTOCOL {
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///
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/// Allows reads and writes to memory-mapped I/O space.
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///
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EFI_MM_IO_ACCESS Mem;
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///
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/// Allows reads and writes to I/O space.
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///
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EFI_MM_IO_ACCESS Io;
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};
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extern EFI_GUID gEfiMmCpuIoProtocolGuid;
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#endif
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