MdeModulePkg/Library/PciHostBridgeLibNull/PciHostBridgeLibNull.c

   1 /** @file
   2   Null instance of PCI Host Bridge Library with empty functions.
   3
   4   Copyright (c) 2016, Intel Corporation. All rights reserved.<BR>
   5
   6   This program and the accompanying materials are licensed and made available
   7   under the terms and conditions of the BSD License which accompanies this
   8   distribution.  The full text of the license may be found at
   9   http://opensource.org/licenses/bsd-license.php.
  10
  11   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT
  12   WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  13
  14 **/
  15 #include <PiDxe.h>
  16 #include <Library/PciHostBridgeLib.h>
  17 #include <Library/DebugLib.h>
  18
  19 GLOBAL_REMOVE_IF_UNREFERENCED
  20 CHAR16 *mPciHostBridgeLibAcpiAddressSpaceTypeStr[] = {
  21   L"Mem", L"I/O", L"Bus"
  22 };
  23
  24 /**
  25   Return all the root bridge instances in an array.
  26
  27   @param Count  Return the count of root bridge instances.
  28
  29   @return All the root bridge instances in an array.
  30           The array should be passed into PciHostBridgeFreeRootBridges()
  31           when it's not used.
  32 **/
  33 PCI_ROOT_BRIDGE *
  34 EFIAPI
  35 PciHostBridgeGetRootBridges (
  36   UINTN *Count
  37   )
  38 {
  39   *Count = 0;
  40   return NULL;
  41 }
  42
  43 /**
  44   Free the root bridge instances array returned from PciHostBridgeGetRootBridges().
  45
  46   @param Bridges The root bridge instances array.
  47   @param Count   The count of the array.
  48 **/
  49 VOID
  50 EFIAPI
  51 PciHostBridgeFreeRootBridges (
  52   PCI_ROOT_BRIDGE *Bridges,
  53   UINTN           Count
  54   )
  55 {
  56   return;
  57 }
  58
  59 /**
  60   Inform the platform that the resource conflict happens.
  61
  62   @param HostBridgeHandle Handle of the Host Bridge.
  63   @param Configuration    Pointer to PCI I/O and PCI memory resource
  64                           descriptors. The Configuration contains the resources
  65                           for all the root bridges. The resource for each root
  66                           bridge is terminated with END descriptor and an
  67                           additional END is appended indicating the end of the
  68                           entire resources. The resource descriptor field
  69                           values follow the description in
  70                           EFI_PCI_HOST_BRIDGE_RESOURCE_ALLOCATION_PROTOCOL
  71                           .SubmitResources().
  72 **/
  73 VOID
  74 EFIAPI
  75 PciHostBridgeResourceConflict (
  76   EFI_HANDLE                        HostBridgeHandle,
  77   VOID                              *Configuration
  78   )
  79 {
  80   EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *Descriptor;
  81   UINTN                             RootBridgeIndex;
  82   DEBUG ((EFI_D_ERROR, "PciHostBridge: Resource conflict happens!\n"));
  83
  84   RootBridgeIndex = 0;
  85   Descriptor = (EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *) Configuration;
  86   while (Descriptor->Desc == ACPI_ADDRESS_SPACE_DESCRIPTOR) {
  87     DEBUG ((EFI_D_ERROR, "RootBridge[%d]:\n", RootBridgeIndex++));
  88     for (; Descriptor->Desc == ACPI_ADDRESS_SPACE_DESCRIPTOR; Descriptor++) {
  89       ASSERT (Descriptor->ResType <
  90               (sizeof (mPciHostBridgeLibAcpiAddressSpaceTypeStr) /
  91                sizeof (mPciHostBridgeLibAcpiAddressSpaceTypeStr[0])
  92                )
  93               );
  94       DEBUG ((EFI_D_ERROR, " %s: Length/Alignment = 0x%lx / 0x%lx\n",
  95               mPciHostBridgeLibAcpiAddressSpaceTypeStr[Descriptor->ResType],
  96               Descriptor->AddrLen, Descriptor->AddrRangeMax
  97               ));
  98       if (Descriptor->ResType == ACPI_ADDRESS_SPACE_TYPE_MEM) {
  99         DEBUG ((EFI_D_ERROR, "     Granularity/SpecificFlag = %ld / %02x%s\n",
 100                 Descriptor->AddrSpaceGranularity, Descriptor->SpecificFlag,
 101                 ((Descriptor->SpecificFlag &
 102                   EFI_ACPI_MEMORY_RESOURCE_SPECIFIC_FLAG_CACHEABLE_PREFETCHABLE
 103                   ) != 0) ? L" (Prefetchable)" : L""
 104                 ));
 105       }
 106     }
 107     //
 108     // Skip the END descriptor for root bridge
 109     //
 110     ASSERT (Descriptor->Desc == ACPI_END_TAG_DESCRIPTOR);
 111     Descriptor = (EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *)(
 112                    (EFI_ACPI_END_TAG_DESCRIPTOR *)Descriptor + 1
 113                    );
 114   }
 115 }