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75 lines
2.6 KiB
C
75 lines
2.6 KiB
C
/** @file
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Library class layered on top of PciCapLib that allows clients to plug a
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PciSegmentLib backend into PciCapLib, for config space access.
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Copyright (C) 2018, Red Hat, Inc.
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#ifndef __PCI_CAP_PCI_SEGMENT_LIB_H__
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#define __PCI_CAP_PCI_SEGMENT_LIB_H__
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#include <Library/PciCapLib.h>
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/**
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Create a PCI_CAP_DEV object from the PCI Segment:Bus:Device.Function
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quadruplet. The config space accessors are based upon PciSegmentLib.
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@param[in] MaxDomain If MaxDomain is PciCapExtended, then
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PciDevice->ReadConfig() and PciDevice->WriteConfig()
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will delegate extended config space accesses too to
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PciSegmentReadBuffer() and PciSegmentWriteBuffer(),
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respectively. Otherwise, PciDevice->ReadConfig() and
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PciDevice->WriteConfig() will reject accesses to
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extended config space with RETURN_UNSUPPORTED, without
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calling PciSegmentReadBuffer() or
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PciSegmentWriteBuffer(). By setting MaxDomain to
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PciCapNormal, the platform can prevent undefined
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PciSegmentLib behavior when the PCI root bridge under
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the PCI device at Segment:Bus:Device.Function doesn't
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support extended config space.
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@param[in] Segment 16-bit wide segment number.
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@param[in] Bus 8-bit wide bus number.
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@param[in] Device 5-bit wide device number.
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@param[in] Function 3-bit wide function number.
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@param[out] PciDevice The PCI_CAP_DEV object constructed as described above.
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PciDevice can be passed to the PciCapLib APIs.
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@retval RETURN_SUCCESS PciDevice has been constructed and output.
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@retval RETURN_INVALID_PARAMETER Device or Function does not fit in the
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permitted number of bits.
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@retval RETURN_OUT_OF_RESOURCES Memory allocation failed.
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**/
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RETURN_STATUS
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EFIAPI
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PciCapPciSegmentDeviceInit (
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IN PCI_CAP_DOMAIN MaxDomain,
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IN UINT16 Segment,
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IN UINT8 Bus,
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IN UINT8 Device,
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IN UINT8 Function,
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OUT PCI_CAP_DEV **PciDevice
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);
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/**
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Free the resources used by PciDevice.
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@param[in] PciDevice The PCI_CAP_DEV object to free, originally produced by
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PciCapPciSegmentDeviceInit().
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**/
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VOID
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EFIAPI
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PciCapPciSegmentDeviceUninit (
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IN PCI_CAP_DEV *PciDevice
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);
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#endif // __PCI_CAP_PCI_SEGMENT_LIB_H__
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