OvmfPkg/Library/PciHostBridgeLib/PciHostBridgeLib.c

   1 /** @file
   2   OVMF's instance of the PCI Host Bridge Library.
   3
   4   Copyright (C) 2016, Red Hat, Inc.
   5   Copyright (c) 2016, Intel Corporation. All rights reserved.<BR>
   6
   7   SPDX-License-Identifier: BSD-2-Clause-Patent
   8
   9 **/
  10 #include <PiDxe.h>
  11
  12 #include <IndustryStandard/Pci.h>
  13 #include <IndustryStandard/Q35MchIch9.h>
  14
  15 #include <Protocol/PciHostBridgeResourceAllocation.h>
  16 #include <Protocol/PciRootBridgeIo.h>
  17
  18 #include <Library/BaseMemoryLib.h>
  19 #include <Library/DebugLib.h>
  20 #include <Library/MemoryAllocationLib.h>
  21 #include <Library/PcdLib.h>
  22 #include <Library/PciHostBridgeLib.h>
  23 #include <Library/PciHostBridgeUtilityLib.h>
  24 #include "PciHostBridge.h"
  25
  26
  27 STATIC PCI_ROOT_BRIDGE_APERTURE mNonExistAperture = { MAX_UINT64, 0 };
  28
  29
  30 /**
  31   Return all the root bridge instances in an array.
  32
  33   @param Count  Return the count of root bridge instances.
  34
  35   @return All the root bridge instances in an array.
  36           The array should be passed into PciHostBridgeFreeRootBridges()
  37           when it's not used.
  38 **/
  39 PCI_ROOT_BRIDGE *
  40 EFIAPI
  41 PciHostBridgeGetRootBridges (
  42   UINTN *Count
  43   )
  44 {
  45   UINT64               Attributes;
  46   UINT64               AllocationAttributes;
  47   PCI_ROOT_BRIDGE_APERTURE Io;
  48   PCI_ROOT_BRIDGE_APERTURE Mem;
  49   PCI_ROOT_BRIDGE_APERTURE MemAbove4G;
  50
  51   if (PcdGetBool (PcdPciDisableBusEnumeration)) {
  52     return ScanForRootBridges (Count);
  53   }
  54
  55   ZeroMem (&Io, sizeof (Io));
  56   ZeroMem (&Mem, sizeof (Mem));
  57   ZeroMem (&MemAbove4G, sizeof (MemAbove4G));
  58
  59   Attributes = EFI_PCI_ATTRIBUTE_IDE_PRIMARY_IO |
  60     EFI_PCI_ATTRIBUTE_IDE_SECONDARY_IO |
  61     EFI_PCI_ATTRIBUTE_ISA_IO_16 |
  62     EFI_PCI_ATTRIBUTE_ISA_MOTHERBOARD_IO |
  63     EFI_PCI_ATTRIBUTE_VGA_MEMORY |
  64     EFI_PCI_ATTRIBUTE_VGA_IO_16 |
  65     EFI_PCI_ATTRIBUTE_VGA_PALETTE_IO_16;
  66
  67   AllocationAttributes = EFI_PCI_HOST_BRIDGE_COMBINE_MEM_PMEM;
  68   if (PcdGet64 (PcdPciMmio64Size) > 0) {
  69     AllocationAttributes |= EFI_PCI_HOST_BRIDGE_MEM64_DECODE;
  70     MemAbove4G.Base = PcdGet64 (PcdPciMmio64Base);
  71     MemAbove4G.Limit = PcdGet64 (PcdPciMmio64Base) +
  72                        PcdGet64 (PcdPciMmio64Size) - 1;
  73   } else {
  74     CopyMem (&MemAbove4G, &mNonExistAperture, sizeof (mNonExistAperture));
  75   }
  76
  77   Io.Base = PcdGet64 (PcdPciIoBase);
  78   Io.Limit = PcdGet64 (PcdPciIoBase) + (PcdGet64 (PcdPciIoSize) - 1);
  79   Mem.Base = PcdGet64 (PcdPciMmio32Base);
  80   Mem.Limit = PcdGet64 (PcdPciMmio32Base) + (PcdGet64 (PcdPciMmio32Size) - 1);
  81
  82   return PciHostBridgeUtilityGetRootBridges (
  83     Count,
  84     Attributes,
  85     AllocationAttributes,
  86     FALSE,
  87     PcdGet16 (PcdOvmfHostBridgePciDevId) != INTEL_Q35_MCH_DEVICE_ID,
  88     &Io,
  89     &Mem,
  90     &MemAbove4G,
  91     &mNonExistAperture,
  92     &mNonExistAperture
  93     );
  94 }
  95
  96
  97 /**
  98   Free the root bridge instances array returned from
  99   PciHostBridgeGetRootBridges().
 100
 101   @param  The root bridge instances array.
 102   @param  The count of the array.
 103 **/
 104 VOID
 105 EFIAPI
 106 PciHostBridgeFreeRootBridges (
 107   PCI_ROOT_BRIDGE *Bridges,
 108   UINTN           Count
 109   )
 110 {
 111   PciHostBridgeUtilityFreeRootBridges (Bridges, Count);
 112 }
 113
 114
 115 /**
 116   Inform the platform that the resource conflict happens.
 117
 118   @param HostBridgeHandle Handle of the Host Bridge.
 119   @param Configuration    Pointer to PCI I/O and PCI memory resource
 120                           descriptors. The Configuration contains the resources
 121                           for all the root bridges. The resource for each root
 122                           bridge is terminated with END descriptor and an
 123                           additional END is appended indicating the end of the
 124                           entire resources. The resource descriptor field
 125                           values follow the description in
 126                           EFI_PCI_HOST_BRIDGE_RESOURCE_ALLOCATION_PROTOCOL
 127                           .SubmitResources().
 128 **/
 129 VOID
 130 EFIAPI
 131 PciHostBridgeResourceConflict (
 132   EFI_HANDLE                        HostBridgeHandle,
 133   VOID                              *Configuration
 134   )
 135 {
 136   PciHostBridgeUtilityResourceConflict (Configuration);
 137 }