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audk/DuetPkg/CpuIoDxe/CpuIo.c

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/*++
Copyright (c) 2004 - 2007, 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.
Module Name:
CpuIo.c
Abstract:
This is the code that publishes the CPU I/O Protocol.
The intent herein is to have a single I/O service that can load
as early as possible, extend into runtime, and be layered upon by
the implementations of architectural protocols and the PCI Root
Bridge I/O Protocol.
--*/
#include "CpuIo.h"
#include "CpuIoAccess.h"
#define IA32_MAX_IO_ADDRESS 0xFFFF
EFI_CPU_IO_PROTOCOL mCpuIo = {
{
CpuMemoryServiceRead,
CpuMemoryServiceWrite
},
{
CpuIoServiceRead,
CpuIoServiceWrite
}
};
STATIC
EFI_STATUS
CpuIoMemRW (
IN EFI_CPU_IO_PROTOCOL_WIDTH Width,
IN UINTN Count,
IN BOOLEAN DestinationStrideFlag,
OUT PTR Destination,
IN BOOLEAN SourceStrideFlag,
IN PTR Source
)
/*++
Routine Description:
Private service to perform memory mapped I/O read/write
Arguments:
Width - Width of the memory mapped I/O operation
Count - Count of the number of accesses to perform
DestinationStrideFlag - Boolean flag indicates if the destination is to be incremented
Destination - Destination of the memory mapped I/O operation
SourceStrideFlag - Boolean flag indicates if the source is to be incremented
Source - Source of the memory mapped I/O operation
Returns:
EFI_SUCCESS - Successful operation
EFI_INVALID_PARAMETER - Width is invalid
--*/
{
UINTN Stride;
UINTN DestinationStride;
UINTN SourceStride;
Width = Width & 0x03;
Stride = (UINTN)1 << Width;
DestinationStride = DestinationStrideFlag ? Stride : 0;
SourceStride = SourceStrideFlag ? Stride : 0;
//
// Loop for each iteration and move the data
//
switch (Width) {
case EfiCpuIoWidthUint8:
for (; Count > 0; Count--, Destination.buf += DestinationStride, Source.buf += SourceStride) {
MemoryFence();
*Destination.ui8 = *Source.ui8;
MemoryFence();
}
break;
case EfiCpuIoWidthUint16:
for (; Count > 0; Count--, Destination.buf += DestinationStride, Source.buf += SourceStride) {
MemoryFence ();
*Destination.ui16 = *Source.ui16;
MemoryFence ();
}
break;
case EfiCpuIoWidthUint32:
for (; Count > 0; Count--, Destination.buf += DestinationStride, Source.buf += SourceStride) {
MemoryFence ();
*Destination.ui32 = *Source.ui32;
MemoryFence ();
}
break;
case EfiCpuIoWidthUint64:
for (; Count > 0; Count--, Destination.buf += DestinationStride, Source.buf += SourceStride) {
MemoryFence ();
*Destination.ui64 = *Source.ui64;
MemoryFence ();
}
break;
default:
return EFI_INVALID_PARAMETER;
}
return EFI_SUCCESS;
}
EFI_STATUS
EFIAPI
CpuMemoryServiceRead (
IN EFI_CPU_IO_PROTOCOL *This,
IN EFI_CPU_IO_PROTOCOL_WIDTH Width,
IN UINT64 Address,
IN UINTN Count,
OUT VOID *Buffer
)
/*++
Routine Description:
Perform the memory mapped I/O read service
Arguments:
This - Pointer to an instance of the CPU I/O Protocol
Width - Width of the memory mapped I/O operation
Address - Base address of the memory mapped I/O operation
Count - Count of the number of accesses to perform
Buffer - Pointer to the destination buffer to store the results
Returns:
EFI_SUCCESS - The data was read.
EFI_INVALID_PARAMETER - Width is invalid.
EFI_INVALID_PARAMETER - Buffer is NULL.
EFI_UNSUPPORTED - The Buffer is not aligned for the given Width.
EFI_UNSUPPORTED - The address range specified by Address, Width,
and Count is not valid.
--*/
{
PTR Source;
PTR Destination;
EFI_STATUS Status;
Status = CpuIoCheckParameter (Width, Address, Count, Buffer, EFI_MAX_ADDRESS);
if (EFI_ERROR (Status)) {
return Status;
}
Destination.buf = Buffer;
Source.buf = (VOID *) (UINTN) Address;
if (Width >= EfiCpuIoWidthUint8 && Width <= EfiCpuIoWidthUint64) {
return CpuIoMemRW (Width, Count, TRUE, Destination, TRUE, Source);
}
if (Width >= EfiCpuIoWidthFifoUint8 && Width <= EfiCpuIoWidthFifoUint64) {
return CpuIoMemRW (Width, Count, TRUE, Destination, FALSE, Source);
}
if (Width >= EfiCpuIoWidthFillUint8 && Width <= EfiCpuIoWidthFillUint64) {
return CpuIoMemRW (Width, Count, FALSE, Destination, TRUE, Source);
}
return EFI_INVALID_PARAMETER;
}
EFI_STATUS
EFIAPI
CpuMemoryServiceWrite (
IN EFI_CPU_IO_PROTOCOL *This,
IN EFI_CPU_IO_PROTOCOL_WIDTH Width,
IN UINT64 Address,
IN UINTN Count,
IN VOID *Buffer
)
/*++
Routine Description:
Perform the memory mapped I/O write service
Arguments:
This - Pointer to an instance of the CPU I/O Protocol
Width - Width of the memory mapped I/O operation
Address - Base address of the memory mapped I/O operation
Count - Count of the number of accesses to perform
Buffer - Pointer to the source buffer from which to write data
Returns:
EFI_SUCCESS - The data was written.
EFI_INVALID_PARAMETER - Width is invalid.
EFI_INVALID_PARAMETER - Buffer is NULL.
EFI_UNSUPPORTED - The Buffer is not aligned for the given Width.
EFI_UNSUPPORTED - The address range specified by Address, Width,
and Count is not valid.
--*/
{
PTR Source;
PTR Destination;
EFI_STATUS Status;
Status = CpuIoCheckParameter (Width, Address, Count, Buffer, EFI_MAX_ADDRESS);
if (EFI_ERROR (Status)) {
return Status;
}
Destination.buf = (VOID *) (UINTN) Address;
Source.buf = Buffer;
if (Width >= EfiCpuIoWidthUint8 && Width <= EfiCpuIoWidthUint64) {
return CpuIoMemRW (Width, Count, TRUE, Destination, TRUE, Source);
}
if (Width >= EfiCpuIoWidthFifoUint8 && Width <= EfiCpuIoWidthFifoUint64) {
return CpuIoMemRW (Width, Count, FALSE, Destination, TRUE, Source);
}
if (Width >= EfiCpuIoWidthFillUint8 && Width <= EfiCpuIoWidthFillUint64) {
return CpuIoMemRW (Width, Count, TRUE, Destination, FALSE, Source);
}
return EFI_INVALID_PARAMETER;
}
EFI_STATUS
EFIAPI
CpuIoServiceRead (
IN EFI_CPU_IO_PROTOCOL *This,
IN EFI_CPU_IO_PROTOCOL_WIDTH Width,
IN UINT64 UserAddress,
IN UINTN Count,
OUT VOID *UserBuffer
)
/*++
Routine Description:
Perform the port I/O read service
Arguments:
This - Pointer to an instance of the CPU I/O Protocol
Width - Width of the port I/O operation
Address - Base address of the port I/O operation
Count - Count of the number of accesses to perform
Buffer - Pointer to the destination buffer to store the results
Returns:
EFI_SUCCESS - The data was read.
EFI_INVALID_PARAMETER - Width is invalid.
EFI_INVALID_PARAMETER - Buffer is NULL.
EFI_UNSUPPORTED - The Buffer is not aligned for the given Width.
EFI_UNSUPPORTED - The address range specified by Address, Width,
and Count is not valid.
--*/
{
UINTN InStride;
UINTN OutStride;
UINTN Address;
PTR Buffer;
EFI_STATUS Status;
Buffer.buf = (UINT8 *) UserBuffer;
if (Width >= EfiCpuIoWidthMaximum) {
return EFI_INVALID_PARAMETER;
}
Status = CpuIoCheckParameter (Width, UserAddress, Count, UserBuffer, IA32_MAX_IO_ADDRESS);
if (EFI_ERROR (Status)) {
return Status;
}
Address = (UINTN) UserAddress;
InStride = (UINTN)1 << (Width & 0x03);
OutStride = InStride;
if (Width >= EfiCpuIoWidthFifoUint8 && Width <= EfiCpuIoWidthFifoUint64) {
InStride = 0;
}
if (Width >= EfiCpuIoWidthFillUint8 && Width <= EfiCpuIoWidthFillUint64) {
OutStride = 0;
}
Width = Width & 0x03;
//
// Loop for each iteration and move the data
//
switch (Width) {
case EfiCpuIoWidthUint8:
for (; Count > 0; Count--, Buffer.buf += OutStride, Address += InStride) {
*Buffer.ui8 = CpuIoRead8 ((UINT16) Address);
}
break;
case EfiCpuIoWidthUint16:
for (; Count > 0; Count--, Buffer.buf += OutStride, Address += InStride) {
*Buffer.ui16 = CpuIoRead16 ((UINT16) Address);
}
break;
case EfiCpuIoWidthUint32:
for (; Count > 0; Count--, Buffer.buf += OutStride, Address += InStride) {
*Buffer.ui32 = CpuIoRead32 ((UINT16) Address);
}
break;
default:
return EFI_INVALID_PARAMETER;
}
return EFI_SUCCESS;
}
EFI_STATUS
EFIAPI
CpuIoServiceWrite (
IN EFI_CPU_IO_PROTOCOL *This,
IN EFI_CPU_IO_PROTOCOL_WIDTH Width,
IN UINT64 UserAddress,
IN UINTN Count,
IN VOID *UserBuffer
)
/*++
Routine Description:
Perform the port I/O write service
Arguments:
This - Pointer to an instance of the CPU I/O Protocol
Width - Width of the port I/O operation
Address - Base address of the port I/O operation
Count - Count of the number of accesses to perform
Buffer - Pointer to the source buffer from which to write data
Returns:
EFI_SUCCESS - The data was written.
EFI_INVALID_PARAMETER - Width is invalid.
EFI_INVALID_PARAMETER - Buffer is NULL.
EFI_UNSUPPORTED - The Buffer is not aligned for the given Width.
EFI_UNSUPPORTED - The address range specified by Address, Width,
and Count is not valid.
--*/
{
UINTN InStride;
UINTN OutStride;
UINTN Address;
PTR Buffer;
EFI_STATUS Status;
Buffer.buf = (UINT8 *) UserBuffer;
if (Width >= EfiCpuIoWidthMaximum) {
return EFI_INVALID_PARAMETER;
}
Status = CpuIoCheckParameter (Width, UserAddress, Count, UserBuffer, IA32_MAX_IO_ADDRESS);
if (EFI_ERROR (Status)) {
return Status;
}
Address = (UINTN) UserAddress;
InStride = (UINTN)1 << (Width & 0x03);
OutStride = InStride;
if (Width >= EfiCpuIoWidthFifoUint8 && Width <= EfiCpuIoWidthFifoUint64) {
InStride = 0;
}
if (Width >= EfiCpuIoWidthFillUint8 && Width <= EfiCpuIoWidthFillUint64) {
OutStride = 0;
}
Width = Width & 0x03;
//
// Loop for each iteration and move the data
//
switch (Width) {
case EfiCpuIoWidthUint8:
for (; Count > 0; Count--, Buffer.buf += OutStride, Address += InStride) {
CpuIoWrite8 ((UINT16) Address, *Buffer.ui8);
}
break;
case EfiCpuIoWidthUint16:
for (; Count > 0; Count--, Buffer.buf += OutStride, Address += InStride) {
CpuIoWrite16 ((UINT16) Address, *Buffer.ui16);
}
break;
case EfiCpuIoWidthUint32:
for (; Count > 0; Count--, Buffer.buf += OutStride, Address += InStride) {
CpuIoWrite32 ((UINT16) Address, *Buffer.ui32);
}
break;
default:
return EFI_INVALID_PARAMETER;
}
return EFI_SUCCESS;
}
EFI_STATUS
EFIAPI
CpuIoInitialize (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
/*++
Routine Description:
CpuIo driver entry point.
Arguments:
ImageHandle - The firmware allocated handle for the EFI image.
SystemTable - A pointer to the EFI System Table.
Returns:
EFI_SUCCESS - The driver was initialized.
EFI_OUT_OF_RESOURCES - The request could not be completed due to a lack of resources.
--*/
{
EFI_STATUS Status;
EFI_HANDLE Handle;
Handle = NULL;
Status = SystemTable->BootServices->InstallProtocolInterface (
&Handle,
&gEfiCpuIoProtocolGuid,
EFI_NATIVE_INTERFACE,
&mCpuIo
);
ASSERT_EFI_ERROR (Status);
return Status;
}
EFI_STATUS
CpuIoCheckParameter (
IN EFI_CPU_IO_PROTOCOL_WIDTH Width,
IN UINT64 Address,
IN UINTN Count,
IN VOID *Buffer,
IN UINT64 Limit
)
/*++
Routine Description:
Check the validation of parameters for CPU I/O interface functions.
Arguments:
Width - Width of the Memory Access
Address - Address of the Memory access
Count - Count of the number of accesses to perform
Buffer - Pointer to the buffer to read from memory
Buffer - Memory buffer for the I/O operation
Limit - Maximum address supported
Returns:
EFI_INVALID_PARAMETER - Buffer is NULL
EFI_UNSUPPORTED - The address range specified by Width, Address and Count is invalid
EFI_UNSUPPORTED - The memory buffer is not aligned
EFI_SUCCESS - Parameters are OK
--*/
{
UINTN AlignMask;
if (Buffer == NULL) {
return EFI_INVALID_PARAMETER;
}
if (Address > Limit) {
return EFI_UNSUPPORTED;
}
//
// For FiFo type, the target address won't increase during the access,
// so treat count as 1
//
if (Width >= EfiCpuIoWidthFifoUint8 && Width <= EfiCpuIoWidthFifoUint64) {
Count = 1;
}
Width = Width & 0x03;
if (Address - 1 + ((UINTN)1 << Width) * Count > Limit) {
return EFI_UNSUPPORTED;
}
AlignMask = ((UINTN)1 << Width) - 1;
if ((UINTN) Buffer & AlignMask) {
return EFI_UNSUPPORTED;
}
return EFI_SUCCESS;
}
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