mirror of https://github.com/acidanthera/audk.git
114 lines
3.9 KiB
C
114 lines
3.9 KiB
C
/** @file
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This PPI opens or closes an I/O aperture in a ISA HOST controller.
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Copyright (c) 2015 - 2018, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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@par Revision Reference:
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This PPI is from PI Version 1.2.1.
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**/
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#ifndef __ISA_HC_PPI_H__
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#define __ISA_HC_PPI_H__
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#define EFI_ISA_HC_PPI_GUID \
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{ \
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0x8d48bd70, 0xc8a3, 0x4c06, {0x90, 0x1b, 0x74, 0x79, 0x46, 0xaa, 0xc3, 0x58} \
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}
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typedef struct _EFI_ISA_HC_PPI EFI_ISA_HC_PPI;
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typedef struct _EFI_ISA_HC_PPI *PEFI_ISA_HC_PPI;
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/**
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Open I/O aperture.
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This function opens an I/O aperture in a ISA Host Controller for the I/O
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addresses specified by IoAddress to IoAddress + IoLength - 1. It is possible
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that more than one caller may be assigned to the same aperture.
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It may be possible that a single hardware aperture may be used for more than
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one device. This function tracks the number of times that each aperture is
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referenced, and does not close the hardware aperture (via CloseIoAperture())
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until there are no more references to it.
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@param This A pointer to this instance of the EFI_ISA_HC_PPI.
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@param IoAddress An unsigned integer that specifies the first byte of
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the I/O space required.
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@param IoLength An unsigned integer that specifies the number of
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bytes of the I/O space required.
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@param IoApertureHandle A pointer to the returned I/O aperture handle.
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This value can be used on subsequent calls to CloseIoAperture().
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@retval EFI_SUCCESS The I/O aperture was opened successfully.
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@retval EFI_UNSUPPORTED The ISA Host Controller is a subtractive-decode controller.
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@retval EFI_OUT_OF_RESOURCES There is no available I/O aperture.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_PEI_ISA_HC_OPEN_IO) (
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IN CONST EFI_ISA_HC_PPI *This,
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IN UINT16 IoAddress,
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IN UINT16 IoLength,
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OUT UINT64 *IoApertureHandle
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);
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/**
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Close I/O aperture.
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This function closes a previously opened I/O aperture handle. If there are no
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more I/O aperture handles that refer to the hardware I/O aperture resource,
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then the hardware I/O aperture is closed.
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It may be possible that a single hardware aperture may be used for more than
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one device. This function tracks the number of times that each aperture is
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referenced, and does not close the hardware aperture (via CloseIoAperture())
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until there are no more references to it.
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@param This A pointer to this instance of the EFI_ISA_HC_PPI.
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@param IoApertureHandle The I/O aperture handle previously returned from a
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call to OpenIoAperture().
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@retval EFI_SUCCESS The I/O aperture was closed successfully.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_PEI_ISA_HC_CLOSE_IO) (
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IN CONST EFI_ISA_HC_PPI *This,
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IN UINT64 IoApertureHandle
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);
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///
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/// This PPI provides functions for opening or closing an I/O aperture.
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///
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struct _EFI_ISA_HC_PPI {
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///
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/// An unsigned integer that specifies the version of the PPI structure.
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///
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UINT32 Version;
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///
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/// The address of the ISA/LPC Bridge device.
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/// For PCI, this is the segment, bus, device and function of the a ISA/LPC
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/// Bridge device.
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///
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/// If bits 24-31 are 0, then the definition is:
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/// Bits 0:2 - Function
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/// Bits 3-7 - Device
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/// Bits 8:15 - Bus
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/// Bits 16-23 - Segment
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/// Bits 24-31 - Bus Type
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/// If bits 24-31 are 0xff, then the definition is platform-specific.
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///
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UINT32 Address;
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///
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/// Opens an aperture on a positive-decode ISA Host Controller.
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///
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EFI_PEI_ISA_HC_OPEN_IO OpenIoAperture;
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///
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/// Closes an aperture on a positive-decode ISA Host Controller.
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///
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EFI_PEI_ISA_HC_CLOSE_IO CloseIoAperture;
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};
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extern EFI_GUID gEfiIsaHcPpiGuid;
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#endif
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