diff options
Diffstat (limited to 'EdkUnixPkg/Dxe/UnixThunk/Cpu/CpuIo.c')
| -rw-r--r-- | EdkUnixPkg/Dxe/UnixThunk/Cpu/CpuIo.c | 335 |
1 files changed, 335 insertions, 0 deletions
diff --git a/EdkUnixPkg/Dxe/UnixThunk/Cpu/CpuIo.c b/EdkUnixPkg/Dxe/UnixThunk/Cpu/CpuIo.c new file mode 100644 index 0000000000..4aaa431d54 --- /dev/null +++ b/EdkUnixPkg/Dxe/UnixThunk/Cpu/CpuIo.c @@ -0,0 +1,335 @@ +/*++
+
+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 = 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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