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/** @file
Default PCI Segment Information Library that returns one segment whose
segment base address equals to PcdPciExpressBaseAddress.
Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials are
licensed and made available under the terms and conditions of
the BSD License which accompanies this distribution. The full
text of the license may be found at
http://opensource.org/licenses/bsd-license.php.
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#include <Base.h>
#include <Library/PciSegmentInfoLib.h>
#include <Library/DebugLib.h>
#include <Library/HobLib.h>
#include <Library/PcdLib.h>
#define PCI_SEGMENT_INFO_HOB_GUID { \
0x6eab7169, 0x9b21, 0x450e, 0x99, 0xe8, 0xe, 0xb1, 0x1b, 0x7d, 0xfe, 0xcb \
}
EFI_GUID mPciSegmentInfoHobGuid = PCI_SEGMENT_INFO_HOB_GUID;
/**
Return an array of PCI_SEGMENT_INFO holding the segment information.
Note: The returned array/buffer is owned by callee.
@param Count Return the count of segments.
@retval A callee owned array holding the segment information.
**/
PCI_SEGMENT_INFO *
EFIAPI
GetPciSegmentInfo (
OUT UINTN *Count
)
{
VOID *Hob;
PCI_SEGMENT_INFO *PciSegmentInfo;
if (Count == NULL) {
return NULL;
}
*Count = 1;
Hob = GetFirstGuidHob (&mPciSegmentInfoHobGuid);
if (Hob != NULL) {
PciSegmentInfo = GET_GUID_HOB_DATA(Hob);
} else {
PciSegmentInfo = BuildGuidHob (&mPciSegmentInfoHobGuid, sizeof(PCI_SEGMENT_INFO));
ASSERT(PciSegmentInfo != NULL);
if (PciSegmentInfo == NULL) {
return NULL;
}
PciSegmentInfo->SegmentNumber = 0;
PciSegmentInfo->BaseAddress = PcdGet64(PcdPciExpressBaseAddress);
PciSegmentInfo->StartBusNumber = 0;
PciSegmentInfo->EndBusNumber = 0xFF;
}
return PciSegmentInfo;
}
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