--- /dev/null
+/** @file\r
+ Header file for SEV IO library.\r
+\r
+ Copyright (c) 2021, Intel Corporation. All rights reserved.<BR>\r
+ SPDX-License-Identifier: BSD-2-Clause-Patent\r
+**/\r
+\r
+#ifndef IOLIB_SEV_H_\r
+#define IOLIB_SEV_H_\r
+\r
+#include <Base.h>\r
+\r
+#include <Library/BaseLib.h>\r
+#include <Library/DebugLib.h>\r
+\r
+/**\r
+ Reads an 8-bit I/O port fifo into a block of memory.\r
+\r
+ Reads the 8-bit I/O fifo port specified by Port.\r
+ The port is read Count times, and the read data is\r
+ stored in the provided Buffer.\r
+\r
+ This function must guarantee that all I/O read and write operations are\r
+ serialized.\r
+\r
+ If 8-bit I/O port operations are not supported, then ASSERT().\r
+\r
+ @param Port The I/O port to read.\r
+ @param Count The number of times to read I/O port.\r
+ @param Buffer The buffer to store the read data into.\r
+\r
+**/\r
+VOID\r
+EFIAPI\r
+SevIoReadFifo8 (\r
+ IN UINTN Port,\r
+ IN UINTN Count,\r
+ OUT VOID *Buffer\r
+ );\r
+\r
+/**\r
+ Writes a block of memory into an 8-bit I/O port fifo.\r
+\r
+ Writes the 8-bit I/O fifo port specified by Port.\r
+ The port is written Count times, and the write data is\r
+ retrieved from the provided Buffer.\r
+\r
+ This function must guarantee that all I/O write and write operations are\r
+ serialized.\r
+\r
+ If 8-bit I/O port operations are not supported, then ASSERT().\r
+\r
+ @param Port The I/O port to write.\r
+ @param Count The number of times to write I/O port.\r
+ @param Buffer The buffer to retrieve the write data from.\r
+\r
+**/\r
+VOID\r
+EFIAPI\r
+SevIoWriteFifo8 (\r
+ IN UINTN Port,\r
+ IN UINTN Count,\r
+ IN VOID *Buffer\r
+ );\r
+\r
+/**\r
+ Reads an 8-bit I/O port fifo into a block of memory.\r
+\r
+ Reads the 8-bit I/O fifo port specified by Port.\r
+ The port is read Count times, and the read data is\r
+ stored in the provided Buffer.\r
+\r
+ This function must guarantee that all I/O read and write operations are\r
+ serialized.\r
+\r
+ If 8-bit I/O port operations are not supported, then ASSERT().\r
+\r
+ @param Port The I/O port to read.\r
+ @param Count The number of times to read I/O port.\r
+ @param Buffer The buffer to store the read data into.\r
+\r
+**/\r
+VOID\r
+EFIAPI\r
+SevIoReadFifo16 (\r
+ IN UINTN Port,\r
+ IN UINTN Count,\r
+ OUT VOID *Buffer\r
+ );\r
+\r
+/**\r
+ Writes a block of memory into an 8-bit I/O port fifo.\r
+\r
+ Writes the 8-bit I/O fifo port specified by Port.\r
+ The port is written Count times, and the write data is\r
+ retrieved from the provided Buffer.\r
+\r
+ This function must guarantee that all I/O write and write operations are\r
+ serialized.\r
+\r
+ If 8-bit I/O port operations are not supported, then ASSERT().\r
+\r
+ @param Port The I/O port to write.\r
+ @param Count The number of times to write I/O port.\r
+ @param Buffer The buffer to retrieve the write data from.\r
+\r
+**/\r
+VOID\r
+EFIAPI\r
+SevIoWriteFifo16 (\r
+ IN UINTN Port,\r
+ IN UINTN Count,\r
+ IN VOID *Buffer\r
+ );\r
+\r
+/**\r
+ Reads an 8-bit I/O port fifo into a block of memory.\r
+\r
+ Reads the 8-bit I/O fifo port specified by Port.\r
+ The port is read Count times, and the read data is\r
+ stored in the provided Buffer.\r
+\r
+ This function must guarantee that all I/O read and write operations are\r
+ serialized.\r
+\r
+ If 8-bit I/O port operations are not supported, then ASSERT().\r
+\r
+ @param Port The I/O port to read.\r
+ @param Count The number of times to read I/O port.\r
+ @param Buffer The buffer to store the read data into.\r
+\r
+**/\r
+VOID\r
+EFIAPI\r
+SevIoReadFifo32 (\r
+ IN UINTN Port,\r
+ IN UINTN Count,\r
+ OUT VOID *Buffer\r
+ );\r
+\r
+/**\r
+ Writes a block of memory into an 8-bit I/O port fifo.\r
+\r
+ Writes the 8-bit I/O fifo port specified by Port.\r
+ The port is written Count times, and the write data is\r
+ retrieved from the provided Buffer.\r
+\r
+ This function must guarantee that all I/O write and write operations are\r
+ serialized.\r
+\r
+ If 8-bit I/O port operations are not supported, then ASSERT().\r
+\r
+ @param Port The I/O port to write.\r
+ @param Count The number of times to write I/O port.\r
+ @param Buffer The buffer to retrieve the write data from.\r
+\r
+**/\r
+VOID\r
+EFIAPI\r
+SevIoWriteFifo32 (\r
+ IN UINTN Port,\r
+ IN UINTN Count,\r
+ IN VOID *Buffer\r
+ );\r
+\r
+#endif\r