/** @file
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PCI Segment Information Library that returns one segment whose
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segment base address is retrieved from AcpiBoardInfo HOB.
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Copyright (c) 2020, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <PiDxe.h>
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#include <Guid/AcpiBoardInfoGuid.h>
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#include <Library/HobLib.h>
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#include <Library/PciSegmentInfoLib.h>
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#include <Library/DebugLib.h>
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STATIC PCI_SEGMENT_INFO mPciSegment0 = {
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0, // Segment number
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0, // To be fixed later
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0, // Start bus number
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255 // End bus number
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};
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/**
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Return an array of PCI_SEGMENT_INFO holding the segment information.
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Note: The returned array/buffer is owned by callee.
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@param Count Return the count of segments.
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@retval A callee owned array holding the segment information.
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**/
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PCI_SEGMENT_INFO *
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EFIAPI
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GetPciSegmentInfo (
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UINTN *Count
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)
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{
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EFI_HOB_GUID_TYPE *GuidHob;
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ACPI_BOARD_INFO *AcpiBoardInfo;
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ASSERT (Count != NULL);
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if (Count == NULL) {
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return NULL;
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}
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if (mPciSegment0.BaseAddress == 0) {
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//
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// Find the acpi board information guid hob
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//
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GuidHob = GetFirstGuidHob (&gUefiAcpiBoardInfoGuid);
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ASSERT (GuidHob != NULL);
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AcpiBoardInfo = (ACPI_BOARD_INFO *) GET_GUID_HOB_DATA (GuidHob);
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mPciSegment0.BaseAddress = AcpiBoardInfo->PcieBaseAddress;
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}
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*Count = 1;
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return &mPciSegment0;
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}
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