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/**@file
Copyright (c) 2006, 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 <CpuDriver.h>
#define IA32_MAX_IO_ADDRESS 0xFFFF
#define IA32_MAX_MEM_ADDRESS 0xFFFFFFFF
EFI_CPU_IO_PROTOCOL mCpuIoProtocol;
EFI_STATUS
CpuIoCheckAddressRange (
IN EFI_CPU_IO_PROTOCOL_WIDTH Width,
IN UINT64 Address,
IN UINTN Count,
IN VOID *Buffer,
IN UINT64 Limit
);
EFI_STATUS
EFIAPI
CpuMemoryServiceRead (
IN EFI_CPU_IO_PROTOCOL *This,
IN EFI_CPU_IO_PROTOCOL_WIDTH Width,
IN UINT64 Address,
IN UINTN Count,
IN OUT VOID *Buffer
)
/*++
Routine Description:
Perform the Memory Access Read service for the CPU I/O Protocol
Arguments:
Pointer to an instance of the CPU I/O Protocol
Width of the Memory Access
Address of the Memory access
Count of the number of accesses to perform
Pointer to the buffer to read or write from memory
Returns:
Status
EFI_SUCCESS - The data was read from or written to the EFI
System.
EFI_INVALID_PARAMETER - Width is invalid for this EFI System.
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 for this EFI System.
--*/
// TODO: This - add argument and description to function comment
{
EFI_STATUS Status;
if (!Buffer) {
return EFI_INVALID_PARAMETER;
}
Status = CpuIoCheckAddressRange (Width, Address, Count, Buffer, IA32_MAX_MEM_ADDRESS);
if (EFI_ERROR (Status)) {
return Status;
}
//
// Do nothing for Nt32 version
//
return EFI_SUCCESS;
}
EFI_STATUS
EFIAPI
CpuMemoryServiceWrite (
IN EFI_CPU_IO_PROTOCOL *This,
IN EFI_CPU_IO_PROTOCOL_WIDTH Width,
IN UINT64 Address,
IN UINTN Count,
IN OUT VOID *Buffer
)
/*++
Routine Description:
Perform the Memory Access Read service for the CPU I/O Protocol
Arguments:
Pointer to an instance of the CPU I/O Protocol
Width of the Memory Access
Address of the Memory access
Count of the number of accesses to perform
Pointer to the buffer to read or write from memory
Returns:
Status
EFI_SUCCESS - The data was read from or written to the EFI System.
EFI_INVALID_PARAMETER - Width is invalid for this EFI System.
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 for this EFI System.
--*/
// TODO: This - add argument and description to function comment
{
EFI_STATUS Status;
if (!Buffer) {
return EFI_INVALID_PARAMETER;
}
Status = CpuIoCheckAddressRange (Width, Address, Count, Buffer, IA32_MAX_MEM_ADDRESS);
if (EFI_ERROR (Status)) {
return Status;
}
//
// Do nothing for Nt32 version
//
return EFI_SUCCESS;
}
EFI_STATUS
EFIAPI
CpuIoServiceRead (
IN EFI_CPU_IO_PROTOCOL *This,
IN EFI_CPU_IO_PROTOCOL_WIDTH Width,
IN UINT64 UserAddress,
IN UINTN Count,
IN OUT VOID *UserBuffer
)
/*++
Routine Description:
This is the service that implements the I/O read
Arguments:
Pointer to an instance of the CPU I/O Protocol
Width of the Memory Access
Address of the I/O access
Count of the number of accesses to perform
Pointer to the buffer to read or write from I/O space
Returns:
Status
EFI_SUCCESS - The data was read from or written to the EFI System.
EFI_INVALID_PARAMETER - Width is invalid for this EFI System.
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 for this EFI System.
--*/
// TODO: This - add argument and description to function comment
// TODO: UserAddress - add argument and description to function comment
// TODO: UserBuffer - add argument and description to function comment
{
UINTN Address;
EFI_STATUS Status;
if (!UserBuffer) {
return EFI_INVALID_PARAMETER;
}
Address = (UINTN) UserAddress;
if (Width >= EfiCpuIoWidthMaximum) {
return EFI_INVALID_PARAMETER;
}
Status = CpuIoCheckAddressRange (Width, Address, Count, UserBuffer, IA32_MAX_IO_ADDRESS);
if (EFI_ERROR (Status)) {
return Status;
}
//
// Do nothing for Nt32 version
//
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 OUT VOID *UserBuffer
)
/*++
Routine Description:
This is the service that implements the I/O Write
Arguments:
Pointer to an instance of the CPU I/O Protocol
Width of the Memory Access
Address of the I/O access
Count of the number of accesses to perform
Pointer to the buffer to read or write from I/O space
Returns:
Status
Status
EFI_SUCCESS - The data was read from or written to the EFI System.
EFI_INVALID_PARAMETER - Width is invalid for this EFI System.
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 for this EFI System.
--*/
// TODO: This - add argument and description to function comment
// TODO: UserAddress - add argument and description to function comment
// TODO: UserBuffer - add argument and description to function comment
{
UINTN Address;
EFI_STATUS Status;
if (!UserBuffer) {
return EFI_INVALID_PARAMETER;
}
Address = (UINTN) UserAddress;
if (Width >= EfiCpuIoWidthMaximum) {
return EFI_INVALID_PARAMETER;
}
Status = CpuIoCheckAddressRange (Width, Address, Count, UserBuffer, IA32_MAX_IO_ADDRESS);
if (EFI_ERROR (Status)) {
return Status;
}
//
// Do nothing for Nt32 version
//
return EFI_SUCCESS;
}
EFI_STATUS
CpuIoCheckAddressRange (
IN EFI_CPU_IO_PROTOCOL_WIDTH Width,
IN UINT64 Address,
IN UINTN Count,
IN VOID *Buffer,
IN UINT64 Limit
)
/*++
Routine Description:
TODO: Add function description
Arguments:
Width - TODO: add argument description
Address - TODO: add argument description
Count - TODO: add argument description
Buffer - TODO: add argument description
Limit - TODO: add argument description
Returns:
EFI_UNSUPPORTED - TODO: Add description for return value
EFI_UNSUPPORTED - TODO: Add description for return value
EFI_UNSUPPORTED - TODO: Add description for return value
EFI_SUCCESS - TODO: Add description for return value
--*/
{
UINTN AlignMask;
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 = (EFI_CPU_IO_PROTOCOL_WIDTH)(Width & 0x03);
if (Address - 1 + (1 << Width) * Count > Limit) {
return EFI_UNSUPPORTED;
}
AlignMask = (1 << Width) - 1;
if ((UINTN) Buffer & AlignMask) {
return EFI_UNSUPPORTED;
}
return EFI_SUCCESS;
}
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