/** @file
I/O Library instance based on EFI_CPU_IO2_PROTOCOL.
Copyright (c) 2010, Intel Corporation. All rights reserved.<BR>
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 "DxeCpuIo2LibInternal.h"
//
// Globle varible to cache pointer to CpuIo2 protocol.
//
EFI_CPU_IO2_PROTOCOL *mCpuIo = NULL;
/**
The constructor function caches the pointer to CpuIo2 protocol.
The constructor function locates CpuIo2 protocol from protocol database.
It will ASSERT() if that operation fails and it will always return EFI_SUCCESS.
@param ImageHandle The firmware allocated handle for the EFI image.
@param SystemTable A pointer to the EFI System Table.
@retval EFI_SUCCESS The constructor always returns EFI_SUCCESS.
**/
EFI_STATUS
EFIAPI
IoLibConstructor (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_STATUS Status;
Status = gBS->LocateProtocol (&gEfiCpuIo2ProtocolGuid, NULL, (VOID **) &mCpuIo);
ASSERT_EFI_ERROR (Status);
return Status;
}
/**
Reads registers in the EFI CPU I/O space.
Reads the I/O port specified by Port with registers width specified by Width.
The read value is returned. If such operations are not supported, then ASSERT().
This function must guarantee that all I/O read and write operations are serialized.
@param Port The base address of the I/O operation.
The caller is responsible for aligning the Address if required.
@param Width The width of the I/O operation.
@return Data read from registers in the EFI CPU I/O space.
**/
UINT64
EFIAPI
IoReadWorker (
IN UINTN Port,
IN EFI_CPU_IO_PROTOCOL_WIDTH Width
)
{
EFI_STATUS Status;
UINT64 Data;
Status = mCpuIo->Io.Read (mCpuIo, Width, Port, 1, &Data);
ASSERT_EFI_ERROR (Status);
return Data;
}
/**
Writes registers in the EFI CPU I/O space.
Writes the I/O port specified by Port with registers width and value specified by Width
and Data respectively. Data is returned. If such operations are not supported, then ASSERT().
This function must guarantee that all I/O read and write operations are serialized.
@param Port The base address of the I/O operation.
The caller is responsible for aligning the Address if required.
@param Width The width of the I/O operation.
@param Data The value to write to the I/O port.
@return The paramter of Data.
**/
UINT64
EFIAPI
IoWriteWorker (
IN UINTN Port,
IN EFI_CPU_IO_PROTOCOL_WIDTH Width,
IN UINT64 Data
)
{
EFI_STATUS Status;
Status = mCpuIo->Io.Write (mCpuIo, Width, Port, 1, &Data);
ASSERT_EFI_ERROR (Status);
return Data;
}
/**
Reads memory-mapped registers in the EFI system memory space.
Reads the MMIO registers specified by Address with registers width specified by Width.
The read value is returned. If such operations are not supported, then ASSERT().
This function must guarantee that all MMIO read and write operations are serialized.
@param Address The MMIO register to read.
The caller is responsible for aligning the Address if required.
@param Width The width of the I/O operation.
@return Data read from registers in the EFI system memory space.
**/
UINT64
EFIAPI
MmioReadWorker (
IN UINTN Address,
IN EFI_CPU_IO_PROTOCOL_WIDTH Width
)
{
EFI_STATUS Status;
UINT64 Data;
Status = mCpuIo->Mem.Read (mCpuIo, Width, Address, 1, &Data);
ASSERT_EFI_ERROR (Status);
return Data;
}
/**
Writes memory-mapped registers in the EFI system memory space.
Writes the MMIO registers specified by Address with registers width and value specified by Width
and Data respectively. Data is returned. If such operations are not supported, then ASSERT().
This function must guarantee that all MMIO read and write operations are serialized.
@param Address The MMIO register to read.
The caller is responsible for aligning the Address if required.
@param Width The width of the I/O operation.
@param Data The value to write to the I/O port.
@return Data read from registers in the EFI system memory space.
**/
UINT64
EFIAPI
MmioWriteWorker (
IN UINTN Address,
IN EFI_CPU_IO_PROTOCOL_WIDTH Width,
IN UINT64 Data
)
{
EFI_STATUS Status;
Status = mCpuIo->Mem.Write (mCpuIo, Width, Address, 1, &Data);
ASSERT_EFI_ERROR (Status);
return Data;
}
/**
Reads an 8-bit I/O port.
Reads the 8-bit I/O port specified by Port. The 8-bit read value is returned.
This function must guarantee that all I/O read and write operations are
serialized.
If 8-bit I/O port operations are not supported, then ASSERT().
@param Port The I/O port to read.
@return The value read.
**/
UINT8
EFIAPI
IoRead8 (
IN UINTN Port
)
{
return (UINT8)IoReadWorker (Port, EfiCpuIoWidthUint8);
}
/**
Writes an 8-bit I/O port.
Writes the 8-bit I/O port specified by Port with the value specified by Value
and returns Value. This function must guarantee that all I/O read and write
operations are serialized.
If 8-bit I/O port operations are not supported, then ASSERT().
@param Port The I/O port to write.
@param Value The value to write to the I/O port.
@return The value written the I/O port.
**/
UINT8
EFIAPI
IoWrite8 (
IN UINTN Port,
IN UINT8 Value
)
{
return (UINT8)IoWriteWorker (Port, EfiCpuIoWidthUint8, Value);
}
/**
Reads a 16-bit I/O port.
Reads the 16-bit I/O port specified by Port. The 16-bit read value is returned.
This function must guarantee that all I/O read and write operations are
serialized.
If Port is not aligned on a 16-bit boundary, then ASSERT().
If 16-bit I/O port operations are not supported, then ASSERT().
@param Port The I/O port to read.
@return The value read.
**/
UINT16
EFIAPI
IoRead16 (
IN UINTN Port
)
{
//
// Make sure Port is aligned on a 16-bit boundary.
//
ASSERT ((Port & 1) == 0);
return (UINT16)IoReadWorker (Port, EfiCpuIoWidthUint16);
}
/**
Writes a 16-bit I/O port.
Writes the 16-bit I/O port specified by Port with the value specified by Value
and returns Value. This function must guarantee that all I/O read and write
operations are serialized.
If Port is not aligned on a 16-bit boundary, then ASSERT().
If 16-bit I/O port operations are not supported, then ASSERT().
@param Port The I/O port to write.
@param Value The value to write to the I/O port.
@return The value written the I/O port.
**/
UINT16
EFIAPI
IoWrite16 (
IN UINTN Port,
IN UINT16 Value
)
{
//
// Make sure Port is aligned on a 16-bit boundary.
//
ASSERT ((Port & 1) == 0);
return (UINT16)IoWriteWorker (Port, EfiCpuIoWidthUint16, Value);
}
/**
Reads a 32-bit I/O port.
Reads the 32-bit I/O port specified by Port. The 32-bit read value is returned.
This function must guarantee that all I/O read and write operations are
serialized.
If Port is not aligned on a 32-bit boundary, then ASSERT().
If 32-bit I/O port operations are not supported, then ASSERT().
@param Port The I/O port to read.
@return The value read.
**/
UINT32
EFIAPI
IoRead32 (
IN UINTN Port
)
{
//
// Make sure Port is aligned on a 32-bit boundary.
//
ASSERT ((Port & 3) == 0);
return (UINT32)IoReadWorker (Port, EfiCpuIoWidthUint32);
}
/**
Writes a 32-bit I/O port.
Writes the 32-bit I/O port specified by Port with the value specified by Value
and returns Value. This function must guarantee that all I/O read and write
operations are serialized.
If Port is not aligned on a 32-bit boundary, then ASSERT().
If 32-bit I/O port operations are not supported, then ASSERT().
@param Port The I/O port to write.
@param Value The value to write to the I/O port.
@return The value written the I/O port.
**/
UINT32
EFIAPI
IoWrite32 (
IN UINTN Port,
IN UINT32 Value
)
{
//
// Make sure Port is aligned on a 32-bit boundary.
//
ASSERT ((Port & 3) == 0);
return (UINT32)IoWriteWorker (Port, EfiCpuIoWidthUint32, Value);
}
/**
Reads a 64-bit I/O port.
Reads the 64-bit I/O port specified by Port. The 64-bit read value is returned.
This function must guarantee that all I/O read and write operations are
serialized.
If Port is not aligned on a 64-bit boundary, then ASSERT().
If 64-bit I/O port operations are not supported, then ASSERT().
@param Port The I/O port to read.
@return The value read.
**/
UINT64
EFIAPI
IoRead64 (
IN UINTN Port
)
{
//
// Make sure Port is aligned on a 64-bit boundary.
//
ASSERT ((Port & 7) == 0);
return IoReadWorker (Port, EfiCpuIoWidthUint64);
}
/**
Writes a 64-bit I/O port.
Writes the 64-bit I/O port specified by Port with the value specified by Value
and returns Value. This function must guarantee that all I/O read and write
operations are serialized.
If Port is not aligned on a 64-bit boundary, then ASSERT().
If 64-bit I/O port operations are not supported, then ASSERT().
@param Port The I/O port to write.
@param Value The value to write to the I/O port.
@return The value written the I/O port.
**/
UINT64
EFIAPI
IoWrite64 (
IN UINTN Port,
IN UINT64 Value
)
{
//
// Make sure Port is aligned on a 64-bit boundary.
//
ASSERT ((Port & 7) == 0);
return IoWriteWorker (Port, EfiCpuIoWidthUint64, Value);
}
/**
Reads an 8-bit MMIO register.
Reads the 8-bit MMIO register specified by Address. The 8-bit read value is
returned. This function must guarantee that all MMIO read and write
operations are serialized.
If 8-bit MMIO register operations are not supported, then ASSERT().
@param Address The MMIO register to read.
@return The value read.
**/
UINT8
EFIAPI
MmioRead8 (
IN UINTN Address
)
{
return (UINT8)MmioReadWorker (Address, EfiCpuIoWidthUint8);
}
/**
Writes an 8-bit MMIO register.
Writes the 8-bit MMIO register specified by Address with the value specified
by Value and returns Value. This function must guarantee that all MMIO read
and write operations are serialized.
If 8-bit MMIO register operations are not supported, then ASSERT().
@param Address The MMIO register to write.
@param Value The value to write to the MMIO register.
**/
UINT8
EFIAPI
MmioWrite8 (
IN UINTN Address,
IN UINT8 Value
)
{
return (UINT8)MmioWriteWorker (Address, EfiCpuIoWidthUint8, Value);
}
/**
Reads a 16-bit MMIO register.
Reads the 16-bit MMIO register specified by Address. The 16-bit read value is
returned. This function must guarantee that all MMIO read and write
operations are serialized.
If Address is not aligned on a 16-bit boundary, then ASSERT().
If 16-bit MMIO register operations are not supported, then ASSERT().
@param Address The MMIO register to read.
@return The value read.
**/
UINT16
EFIAPI
MmioRead16 (
IN UINTN Address
)
{
//
// Make sure Address is aligned on a 16-bit boundary.
//
ASSERT ((Address & 1) == 0);
return (UINT16)MmioReadWorker (Address, EfiCpuIoWidthUint16);
}
/**
Writes a 16-bit MMIO register.
Writes the 16-bit MMIO register specified by Address with the value specified
by Value and returns Value. This function must guarantee that all MMIO read
and write operations are serialized.
If Address is not aligned on a 16-bit boundary, then ASSERT().
If 16-bit MMIO register operations are not supported, then ASSERT().
@param Address The MMIO register to write.
@param Value The value to write to the MMIO register.
**/
UINT16
EFIAPI
MmioWrite16 (
IN UINTN Address,
IN UINT16 Value
)
{
//
// Make sure Address is aligned on a 16-bit boundary.
//
ASSERT ((Address & 1) == 0);
return (UINT16)MmioWriteWorker (Address, EfiCpuIoWidthUint16, Value);
}
/**
Reads a 32-bit MMIO register.
Reads the 32-bit MMIO register specified by Address. The 32-bit read value is
returned. This function must guarantee that all MMIO read and write
operations are serialized.
If Address is not aligned on a 32-bit boundary, then ASSERT().
If 32-bit MMIO register operations are not supported, then ASSERT().
@param Address The MMIO register to read.
@return The value read.
**/
UINT32
EFIAPI
MmioRead32 (
IN UINTN Address
)
{
//
// Make sure Address is aligned on a 32-bit boundary.
//
ASSERT ((Address & 3) == 0);
return (UINT32)MmioReadWorker (Address, EfiCpuIoWidthUint32);
}
/**
Writes a 32-bit MMIO register.
Writes the 32-bit MMIO register specified by Address with the value specified
by Value and returns Value. This function must guarantee that all MMIO read
and write operations are serialized.
If Address is not aligned on a 32-bit boundary, then ASSERT().
If 32-bit MMIO register operations are not supported, then ASSERT().
@param Address The MMIO register to write.
@param Value The value to write to the MMIO register.
**/
UINT32
EFIAPI
MmioWrite32 (
IN UINTN Address,
IN UINT32 Value
)
{
//
// Make sure Address is aligned on a 32-bit boundary.
//
ASSERT ((Address & 3) == 0);
return (UINT32)MmioWriteWorker (Address, EfiCpuIoWidthUint32, Value);
}
/**
Reads a 64-bit MMIO register.
Reads the 64-bit MMIO register specified by Address. The 64-bit read value is
returned. This function must guarantee that all MMIO read and write
operations are serialized.
If Address is not aligned on a 64-bit boundary, then ASSERT().
If 64-bit MMIO register operations are not supported, then ASSERT().
@param Address The MMIO register to read.
@return The value read.
**/
UINT64
EFIAPI
MmioRead64 (
IN UINTN Address
)
{
//
// Make sure Address is aligned on a 64-bit boundary.
//
ASSERT ((Address & 7) == 0);
return (UINT64)MmioReadWorker (Address, EfiCpuIoWidthUint64);
}
/**
Writes a 64-bit MMIO register.
Writes the 64-bit MMIO register specified by Address with the value specified
by Value and returns Value. This function must guarantee that all MMIO read
and write operations are serialized.
If Address is not aligned on a 64-bit boundary, then ASSERT().
If 64-bit MMIO register operations are not supported, then ASSERT().
@param Address The MMIO register to write.
@param Value The value to write to the MMIO register.
**/
UINT64
EFIAPI
MmioWrite64 (
IN UINTN Address,
IN UINT64 Value
)
{
//
// Make sure Address is aligned on a 64-bit boundary.
//
ASSERT ((Address & 7) == 0);
return (UINT64)MmioWriteWorker (Address, EfiCpuIoWidthUint64, Value);
}