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111 lines
3.9 KiB
C
111 lines
3.9 KiB
C
/** @file
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ISA HC Protocol as defined in the PI 1.2.1 specification.
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This protocol provides registration for ISA devices on a positive- or
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subtractive-decode ISA bus. It allows devices to be registered and also
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handles opening and closing the apertures which are positively-decoded.
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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 protocol is from PI Version 1.2.1.
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**/
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#ifndef __ISA_HC_PROTOCOL_H__
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#define __ISA_HC_PROTOCOL_H__
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#define EFI_ISA_HC_PROTOCOL_GUID \
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{ \
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0xbcdaf080, 0x1bde, 0x4e22, {0xae, 0x6a, 0x43, 0x54, 0x1e, 0x12, 0x8e, 0xc4} \
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}
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#define EFI_ISA_HC_SERVICE_BINDING_PROTOCOL_GUID \
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{ \
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0xfad7933a, 0x6c21, 0x4234, {0xa4, 0x34, 0x0a, 0x8a, 0x0d, 0x2b, 0x07, 0x81} \
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}
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typedef struct _EFI_ISA_HC_PROTOCOL EFI_ISA_HC_PROTOCOL;
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typedef struct _EFI_ISA_HC_PROTOCOL *PEFI_ISA_HC_PROTOCOL;
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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 addresses
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specified by IoAddress to IoAddress + IoLength - 1. It may be possible that a
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single hardware aperture may be used for more than one device. This function
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tracks the number of times that each aperture is referenced, and does not close
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the hardware aperture (via CloseIoAperture()) until there are no more references to it.
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@param This A pointer to this instance of the EFI_ISA_HC_PROTOCOL.
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@param IoAddress An unsigned integer that specifies the first byte of the
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I/O space required.
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@param IoLength An unsigned integer that specifies the number of bytes
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of the I/O space required.
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@param IoApertureHandle A pointer to the returned I/O aperture handle. This
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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_ISA_HC_OPEN_IO) (
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IN CONST EFI_ISA_HC_PROTOCOL *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. It may be possible that a single
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hardware aperture may be used for more than one device. This function tracks
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the number of times that each aperture is referenced, and does not close the
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hardware aperture (via CloseIoAperture()) until there are no more references to it.
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@param This A pointer to this instance of the EFI_ISA_HC_PROTOCOL.
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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 IO 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_ISA_HC_CLOSE_IO) (
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IN CONST EFI_ISA_HC_PROTOCOL *This,
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IN UINT64 IoApertureHandle
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);
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///
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/// ISA HC Protocol
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///
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struct _EFI_ISA_HC_PROTOCOL {
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///
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/// The version of this protocol. Higher version numbers are backward
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/// compatible with lower version numbers.
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///
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UINT32 Version;
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///
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/// Open an I/O aperture.
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///
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EFI_ISA_HC_OPEN_IO OpenIoAperture;
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///
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/// Close an I/O aperture.
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///
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EFI_ISA_HC_CLOSE_IO CloseIoAperture;
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};
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///
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/// Reference to variable defined in the .DEC file
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///
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extern EFI_GUID gEfiIsaHcProtocolGuid;
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extern EFI_GUID gEfiIsaHcServiceBindingProtocolGuid;
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#endif // __ISA_HC_H__
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