/** @file
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Default PCI Segment Information Library that returns one segment whose
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segment base address equals to PcdPciExpressBaseAddress.
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Copyright (c) 2017, 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 <Base.h>
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#include <Library/PciSegmentInfoLib.h>
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#include <Library/DebugLib.h>
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#include <Library/HobLib.h>
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#include <Library/PcdLib.h>
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#define PCI_SEGMENT_INFO_HOB_GUID { \
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0x6eab7169, 0x9b21, 0x450e, { 0x99, 0xe8, 0xe, 0xb1, 0x1b, 0x7d, 0xfe, 0xcb } \
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}
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EFI_GUID mPciSegmentInfoHobGuid = PCI_SEGMENT_INFO_HOB_GUID;
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volatile PCI_SEGMENT_INFO mPciSegmentInfo;
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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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OUT UINTN *Count
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)
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{
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VOID *Hob;
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PCI_SEGMENT_INFO *PciSegmentInfo;
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if (Count == NULL) {
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return NULL;
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}
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*Count = 1;
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Hob = GetFirstGuidHob (&mPciSegmentInfoHobGuid);
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if (Hob != NULL) {
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PciSegmentInfo = GET_GUID_HOB_DATA(Hob);
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} else {
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mPciSegmentInfo.SegmentNumber = 0;
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mPciSegmentInfo.BaseAddress = PcdGet64(PcdPciExpressBaseAddress);
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mPciSegmentInfo.StartBusNumber = 0;
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mPciSegmentInfo.EndBusNumber = (UINT8)((PcdGet32 (PcdPciExpressRegionLength) / 0x100000) - 1);
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DEBUG ((DEBUG_INFO, "mPciSegmentInfo.BaseAddress - 0x%x\n", mPciSegmentInfo.BaseAddress));
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if (mPciSegmentInfo.BaseAddress == 0) {
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// Premem phase
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PciSegmentInfo = BuildGuidHob (&mPciSegmentInfoHobGuid, sizeof(PCI_SEGMENT_INFO));
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ASSERT(PciSegmentInfo != NULL);
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if (PciSegmentInfo == NULL) {
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return NULL;
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}
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PciSegmentInfo->SegmentNumber = 0;
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PciSegmentInfo->BaseAddress = PcdGet64(PcdPciExpressBaseAddress);
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PciSegmentInfo->StartBusNumber = 0;
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PciSegmentInfo->EndBusNumber = (UINT8)((PcdGet32 (PcdPciExpressRegionLength) / 0x100000) - 1);
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} else {
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PciSegmentInfo = (VOID *)&mPciSegmentInfo;
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}
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}
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return PciSegmentInfo;
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}
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