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 <IndustryStandard/Pci.h>                     // PCI_MAX_BUS
  11 #include <IndustryStandard/Q35MchIch9.h>              // INTEL_Q35_MCH_DEVIC...
  12 #include <Library/BaseMemoryLib.h>                    // ZeroMem()
  13 #include <Library/PcdLib.h>                           // PcdGet64()
  14 #include <Library/PciHostBridgeLib.h>                 // PCI_ROOT_BRIDGE_APE...
  15 #include <Library/PciHostBridgeUtilityLib.h>          // PciHostBridgeUtilit...
  16 #include <Protocol/PciHostBridgeResourceAllocation.h> // EFI_PCI_HOST_BRIDGE...
  17 #include <Protocol/PciRootBridgeIo.h>                 // EFI_PCI_ATTRIBUTE_I...
  18
  19 STATIC PCI_ROOT_BRIDGE_APERTURE  mNonExistAperture = { MAX_UINT64, 0 };
  20
  21 /**
  22   Return all the root bridge instances in an array.
  23
  24   @param Count  Return the count of root bridge instances.
  25
  26   @return All the root bridge instances in an array.
  27           The array should be passed into PciHostBridgeFreeRootBridges()
  28           when it's not used.
  29 **/
  30 PCI_ROOT_BRIDGE *
  31 EFIAPI
  32 PciHostBridgeGetRootBridges (
  33   UINTN  *Count
  34   )
  35 {
  36   UINT64                    Attributes;
  37   UINT64                    AllocationAttributes;
  38   PCI_ROOT_BRIDGE_APERTURE  Io;
  39   PCI_ROOT_BRIDGE_APERTURE  Mem;
  40   PCI_ROOT_BRIDGE_APERTURE  MemAbove4G;
  41
  42   ZeroMem (&Io, sizeof (Io));
  43   ZeroMem (&Mem, sizeof (Mem));
  44   ZeroMem (&MemAbove4G, sizeof (MemAbove4G));
  45
  46   Attributes = EFI_PCI_ATTRIBUTE_IDE_PRIMARY_IO |
  47                EFI_PCI_ATTRIBUTE_IDE_SECONDARY_IO |
  48                EFI_PCI_ATTRIBUTE_ISA_IO_16 |
  49                EFI_PCI_ATTRIBUTE_ISA_MOTHERBOARD_IO |
  50                EFI_PCI_ATTRIBUTE_VGA_MEMORY |
  51                EFI_PCI_ATTRIBUTE_VGA_IO_16 |
  52                EFI_PCI_ATTRIBUTE_VGA_PALETTE_IO_16;
  53
  54   AllocationAttributes = EFI_PCI_HOST_BRIDGE_COMBINE_MEM_PMEM;
  55   if (PcdGet64 (PcdPciMmio64Size) > 0) {
  56     AllocationAttributes |= EFI_PCI_HOST_BRIDGE_MEM64_DECODE;
  57     MemAbove4G.Base       = PcdGet64 (PcdPciMmio64Base);
  58     MemAbove4G.Limit      = PcdGet64 (PcdPciMmio64Base) +
  59                             PcdGet64 (PcdPciMmio64Size) - 1;
  60   } else {
  61     CopyMem (&MemAbove4G, &mNonExistAperture, sizeof (mNonExistAperture));
  62   }
  63
  64   Io.Base   = PcdGet64 (PcdPciIoBase);
  65   Io.Limit  = PcdGet64 (PcdPciIoBase) + (PcdGet64 (PcdPciIoSize) - 1);
  66   Mem.Base  = PcdGet64 (PcdPciMmio32Base);
  67   Mem.Limit = PcdGet64 (PcdPciMmio32Base) + (PcdGet64 (PcdPciMmio32Size) - 1);
  68
  69   return PciHostBridgeUtilityGetRootBridges (
  70            Count,
  71            Attributes,
  72            AllocationAttributes,
  73            FALSE,
  74            PcdGet16 (PcdOvmfHostBridgePciDevId) != INTEL_Q35_MCH_DEVICE_ID,
  75            0,
  76            PCI_MAX_BUS,
  77            &Io,
  78            &Mem,
  79            &MemAbove4G,
  80            &mNonExistAperture,
  81            &mNonExistAperture
  82            );
  83 }
  84
  85 /**
  86   Free the root bridge instances array returned from
  87   PciHostBridgeGetRootBridges().
  88
  89   @param  The root bridge instances array.
  90   @param  The count of the array.
  91 **/
  92 VOID
  93 EFIAPI
  94 PciHostBridgeFreeRootBridges (
  95   PCI_ROOT_BRIDGE  *Bridges,
  96   UINTN            Count
  97   )
  98 {
  99   PciHostBridgeUtilityFreeRootBridges (Bridges, Count);
 100 }
 101
 102 /**
 103   Inform the platform that the resource conflict happens.
 104
 105   @param HostBridgeHandle Handle of the Host Bridge.
 106   @param Configuration    Pointer to PCI I/O and PCI memory resource
 107                           descriptors. The Configuration contains the resources
 108                           for all the root bridges. The resource for each root
 109                           bridge is terminated with END descriptor and an
 110                           additional END is appended indicating the end of the
 111                           entire resources. The resource descriptor field
 112                           values follow the description in
 113                           EFI_PCI_HOST_BRIDGE_RESOURCE_ALLOCATION_PROTOCOL
 114                           .SubmitResources().
 115 **/
 116 VOID
 117 EFIAPI
 118 PciHostBridgeResourceConflict (
 119   EFI_HANDLE  HostBridgeHandle,
 120   VOID        *Configuration
 121   )
 122 {
 123   PciHostBridgeUtilityResourceConflict (Configuration);
 124 }