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89 lines
3.1 KiB
C
89 lines
3.1 KiB
C
/** @file
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SMM CPU I/O protocol as defined in the Intel Framework specification.
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This protocol provides CPU I/O and memory access within SMM.
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Copyright (c) 2009 - 2010, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials are licensed and made available under
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the terms and conditions of the BSD License that accompanies this distribution.
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The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php.
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#ifndef _SMM_CPU_IO_H_
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#define _SMM_CPU_IO_H_
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#include <Protocol/SmmCpuIo2.h>
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#define EFI_SMM_CPU_IO_GUID \
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{ \
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0x5f439a0b, 0x45d8, 0x4682, {0xa4, 0xf4, 0xf0, 0x57, 0x6b, 0x51, 0x34, 0x41} \
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}
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typedef struct _EFI_SMM_CPU_IO_INTERFACE EFI_SMM_CPU_IO_INTERFACE;
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/**
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Provides the basic memory and I/O interfaces used to abstract 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_SMM_CPU_IO_INTERFACE 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_SMM_CPU_IO)(
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IN EFI_SMM_CPU_IO_INTERFACE *This,
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IN EFI_SMM_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_SMM_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_SMM_CPU_IO Write;
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} EFI_SMM_IO_ACCESS;
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///
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/// SMM CPU I/O Protocol provides CPU I/O and memory access within SMM.
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///
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struct _EFI_SMM_CPU_IO_INTERFACE {
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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_SMM_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_SMM_IO_ACCESS Io;
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};
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extern EFI_GUID gEfiSmmCpuIoGuid;
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#endif
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