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/** @file
Implementation of CPU I/O 2 Protocol based on Framework CPU I/O Protocol.
Intel's Framework CPU I/O Protocol is replaced by CPU I/O 2 Protocol in PI.
This module produces PI CPU I/O 2 Protocol on top of Framework CPU I/O Protocol.
Copyright (c) 2009, Intel Corporation
All rights reserved. This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#include "CpuIo2OnCpuIoThunk.h"
EFI_HANDLE mCpuIo2Handle = NULL;
EFI_CPU_IO_PROTOCOL *mCpuIo;
EFI_CPU_IO2_PROTOCOL mCpuIo2 = {
{
CpuMemoryServiceRead,
CpuMemoryServiceWrite
},
{
CpuIoServiceRead,
CpuIoServiceWrite
}
};
/**
Enables a driver to read memory-mapped registers in the PI System memory space.
@param[in] This A pointer to the EFI_CPU_IO2_PROTOCOL instance.
@param[in] Width Signifies the width of the memory operation.
@param[in] Address The base address of the memory operation.
@param[in] Count The number of memory operations to perform. The number of bytes moved
is Width size * Count, starting at Address.
@param[out] Buffer The destination buffer to store the results.
@retval EFI_SUCCESS The data was read from or written to the EFI system.
@retval EFI_INVALID_PARAMETER Width is invalid for this EFI system. Or Buffer is NULL.
@retval EFI_UNSUPPORTED The Buffer is not aligned for the given Width.
Or,The address range specified by Address, Width, and Count is not valid for this EFI system.
**/
EFI_STATUS
EFIAPI
CpuMemoryServiceRead (
IN EFI_CPU_IO2_PROTOCOL *This,
IN EFI_CPU_IO_PROTOCOL_WIDTH Width,
IN UINT64 Address,
IN UINTN Count,
OUT VOID *Buffer
)
{
return mCpuIo->Mem.Read (
mCpuIo,
Width,
Address,
Count,
Buffer
);
}
/**
Enables a driver to write memory-mapped registers in the PI System memory space.
@param[in] This A pointer to the EFI_CPU_IO2_PROTOCOL instance.
@param[in] Width Signifies the width of the memory operation.
@param[in] Address The base address of the memory operation.
@param[in] Count The number of memory operations to perform. The number of bytes moved
is Width size * Count, starting at Address.
@param[in] Buffer The source buffer from which to write data.
@retval EFI_SUCCESS The data was read from or written to the EFI system.
@retval EFI_INVALID_PARAMETER Width is invalid for this EFI system. Or Buffer is NULL.
@retval EFI_UNSUPPORTED The Buffer is not aligned for the given Width.
Or,The address range specified by Address, Width, and Count is not valid for this EFI system.
**/
EFI_STATUS
EFIAPI
CpuMemoryServiceWrite (
IN EFI_CPU_IO2_PROTOCOL *This,
IN EFI_CPU_IO_PROTOCOL_WIDTH Width,
IN UINT64 Address,
IN UINTN Count,
IN VOID *Buffer
)
{
return mCpuIo->Mem.Write (
mCpuIo,
Width,
Address,
Count,
Buffer
);
}
/**
Enables a driver to read registers in the PI CPU I/O space.
@param[in] This A pointer to the EFI_CPU_IO2_PROTOCOL instance.
@param[in] Width Signifies the width of the I/O operation.
@param[in] Address The base address of the I/O operation. The caller is responsible
for aligning the Address if required.
@param[in] Count The number of I/O operations to perform. The number of bytes moved
is Width size * Count, starting at Address.
@param[out] Buffer The destination buffer to store the results.
@retval EFI_SUCCESS The data was read from or written to the EFI system.
@retval EFI_INVALID_PARAMETER Width is invalid for this EFI system. Or Buffer is NULL.
@retval EFI_UNSUPPORTED The Buffer is not aligned for the given Width.
Or,The address range specified by Address, Width, and Count is not valid for this EFI system.
**/
EFI_STATUS
EFIAPI
CpuIoServiceRead (
IN EFI_CPU_IO2_PROTOCOL *This,
IN EFI_CPU_IO_PROTOCOL_WIDTH Width,
IN UINT64 Address,
IN UINTN Count,
OUT VOID *Buffer
)
{
return mCpuIo->Io.Read (
mCpuIo,
Width,
Address,
Count,
Buffer
);
}
/**
Enables a driver to write registers in the PI CPU I/O space.
@param[in] This A pointer to the EFI_CPU_IO2_PROTOCOL instance.
@param[in] Width Signifies the width of the I/O operation.
@param[in] Address The base address of the I/O operation. The caller is responsible
for aligning the Address if required.
@param[in] Count The number of I/O operations to perform. The number of bytes moved
is Width size * Count, starting at Address.
@param[in] Buffer The source buffer from which to write data.
@retval EFI_SUCCESS The data was read from or written to the EFI system.
@retval EFI_INVALID_PARAMETER Width is invalid for this EFI system. Or Buffer is NULL.
@retval EFI_UNSUPPORTED The Buffer is not aligned for the given Width.
Or,The address range specified by Address, Width, and Count is not valid for this EFI system.
**/
EFI_STATUS
EFIAPI
CpuIoServiceWrite (
IN EFI_CPU_IO2_PROTOCOL *This,
IN EFI_CPU_IO_PROTOCOL_WIDTH Width,
IN UINT64 Address,
IN UINTN Count,
IN VOID *Buffer
)
{
return mCpuIo->Io.Write (
mCpuIo,
Width,
Address,
Count,
Buffer
);
}
/**
Entrypoint of CPU I/O 2 DXE thunk module.
@param ImageHandle The firmware allocated handle for the EFI image.
@param SystemTable A pointer to the EFI System Table.
@retval EFI_SUCCESS The entry point is executed successfully.
**/
EFI_STATUS
EFIAPI
CpuIo2OnCpuIoThunkInitialize (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_STATUS Status;
//
// Locate and cache Framework CPU I/O Protocol.
//
Status = gBS->LocateProtocol (
&gEfiCpuIoProtocolGuid,
NULL,
(VOID **) &mCpuIo
);
ASSERT_EFI_ERROR (Status);
//
// Install the CPU I/O 2 Protocol on a new handle.
//
Status = gBS->InstallMultipleProtocolInterfaces (
&mCpuIo2Handle,
&gEfiCpuIo2ProtocolGuid, &mCpuIo2,
NULL
);
ASSERT_EFI_ERROR (Status);
return Status;
}
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