--- /dev/null
+/** @file\r
+ This PPI opens or closes an I/O aperture in a ISA HOST controller.\r
+\r
+ Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>\r
+ This program and the accompanying materials \r
+ are licensed and made available under the terms and conditions of the BSD License \r
+ which accompanies this distribution. The full text of the license may be found at \r
+ http://opensource.org/licenses/bsd-license.php \r
+\r
+ THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r
+ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. \r
+\r
+ @par Revision Reference:\r
+ This PPI is from PI Version 1.2.1.\r
+\r
+**/\r
+\r
+#ifndef __ISA_HC_PPI_H__\r
+#define __ISA_HC_PPI_H__\r
+\r
+#define EFI_ISA_HC_PPI_GUID \\r
+ { \\r
+ 0x8d48bd70, 0xc8a3, 0x4c06, {0x90, 0x1b, 0x74, 0x79, 0x46, 0xaa, 0xc3, 0x58} \\r
+ }\r
+\r
+typedef struct _EFI_ISA_HC_PPI EFI_ISA_HC_PPI;\r
+typedef struct _EFI_ISA_HC_PPI *PEFI_ISA_HC_PPI;\r
+\r
+/**\r
+ Open I/O aperture.\r
+\r
+ This function opens an I/O aperture in a ISA Host Controller for the I/O\r
+ addresses specified by IoAddress to IoAddress + IoLength - 1. It is possible\r
+ that more than one caller may be assigned to the same aperture.\r
+ It may be possible that a single hardware aperture may be used for more than\r
+ one device. This function tracks the number of times that each aperture is \r
+ referenced, and doesa not close the hardware aperture (via CloseIoAperture())\r
+ until there are no more references to it.\r
+ \r
+ @param This A pointer to this instance of the EFI_ISA_HC_PPI.\r
+ @param IoAddress An unsigned integer that specifies the first byte of\r
+ the I/O space required.\r
+ @param IoLength An unsigned integer that specifies the number of\r
+ bytes of the I/O space required.\r
+ @param IoApertureHandle A pointer to the returned I/O aperture handle.\r
+ This value can be used on subsequent calls to CloseIoAperture().\r
+\r
+ @retval EFI_SUCCESS The I/O aperture was opened successfully.\r
+ @retval EFI_UNSUPPORTED The ISA Host Controller is a subtractive-decode controller.\r
+ @retval EFI_OUT_OF_RESOURCES There is no available I/O aperture.\r
+**/\r
+typedef\r
+EFI_STATUS\r
+(EFIAPI *EFI_PEI_ISA_HC_OPEN_IO) (\r
+ IN CONST EFI_ISA_HC_PPI *This,\r
+ IN UINT16 IoAddress,\r
+ IN UINT16 IoLength,\r
+ OUT UINT64 *IoApertureHandle\r
+ );\r
+\r
+/**\r
+ Close I/O aperture.\r
+\r
+ This function closes a previously opened I/O aperture handle. If there are no\r
+ more I/O aperture handles that refer to the hardware I/O aperture resource,\r
+ then the hardware I/O aperture is closed.\r
+ It may be possible that a single hardware aperture may be used for more than\r
+ one device. This function tracks the number of times that each aperture is\r
+ referenced, and does not close the hardware aperture (via CloseIoAperture())\r
+ until there are no more references to it.\r
+\r
+ @param This A pointer to this instance of the EFI_ISA_HC_PPI.\r
+ @param IoApertureHandle The I/O aperture handle previously returned from a\r
+ call to OpenIoAperture().\r
+\r
+ @retval EFI_SUCCESS The I/O aperture was closed successfully.\r
+**/ \r
+typedef\r
+EFI_STATUS\r
+(EFIAPI *EFI_PEI_ISA_HC_CLOSE_IO) (\r
+ IN CONST EFI_ISA_HC_PPI *This,\r
+ IN UINT64 IoApertureHandle\r
+ );\r
+\r
+///\r
+/// This PPI provides functions for opening or closing an I/O aperture.\r
+///\r
+struct _EFI_ISA_HC_PPI {\r
+ ///\r
+ /// An unsigned integer that specifies the version of the PPI structure.\r
+ ///\r
+ UINT32 Version;\r
+ ///\r
+ /// The address of the ISA/LPC Bridge device.\r
+ /// For PCI, this is the segment, bus, device and function of the a ISA/LPC\r
+ /// Bridge device.\r
+ ///\r
+ /// If bits 24-31 are 0, then the definition is:\r
+ /// Bits 0:2 - Function\r
+ /// Bits 3-7 - Device\r
+ /// Bits 8:15 - Bus\r
+ /// Bits 16-23 - Segment\r
+ /// Bits 24-31 - Bus Type\r
+ /// If bits 24-31 are 0xff, then the definition is platform-specific.\r
+ ///\r
+ UINT32 Address;\r
+ ///\r
+ /// Opens an aperture on a positive-decode ISA Host Controller.\r
+ ///\r
+ EFI_PEI_ISA_HC_OPEN_IO OpenIoAperture;\r
+ ///\r
+ /// Closes an aperture on a positive-decode ISA Host Controller.\r
+ ///\r
+ EFI_PEI_ISA_HC_CLOSE_IO CloseIoAperture;\r
+};\r
+\r
+extern EFI_GUID gEfiIsaHcPpiGuid;\r
+\r
+#endif \r