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
  45   PciHostBridgeGetRootBridges().
  46
  47   @param  The root bridge instances array.
  48   @param  The count of the array.
  49 **/
  50 VOID
  51 EFIAPI
  52 PciHostBridgeFreeRootBridges (
  53   PCI_ROOT_BRIDGE *Bridges,
  54   UINTN           Count
  55   )
  56 {
  57   return;
  58 }
  59
  60 /**
  61   Inform the platform that the resource conflict happens.
  62
  63   @param HostBridgeHandle Handle of the Host Bridge.
  64   @param Configuration    Pointer to PCI I/O and PCI memory resource
  65                           descriptors. The Configuration contains the resources
  66                           for all the root bridges. The resource for each root
  67                           bridge is terminated with END descriptor and an
  68                           additional END is appended indicating the end of the
  69                           entire resources. The resource descriptor field
  70                           values follow the description in
  71                           EFI_PCI_HOST_BRIDGE_RESOURCE_ALLOCATION_PROTOCOL
  72                           .SubmitResources().
  73 **/
  74 VOID
  75 EFIAPI
  76 PciHostBridgeResourceConflict (
  77   EFI_HANDLE                        HostBridgeHandle,
  78   VOID                              *Configuration
  79   )
  80 {
  81   EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *Descriptor;
  82   UINTN                             RootBridgeIndex;
  83   DEBUG ((EFI_D_ERROR, "PciHostBridge: Resource conflict happens!\n"));
  84
  85   RootBridgeIndex = 0;
  86   Descriptor = (EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *) Configuration;
  87   while (Descriptor->Desc == ACPI_ADDRESS_SPACE_DESCRIPTOR) {
  88     DEBUG ((EFI_D_ERROR, "RootBridge[%d]:\n", RootBridgeIndex++));
  89     for (; Descriptor->Desc == ACPI_ADDRESS_SPACE_DESCRIPTOR; Descriptor++) {
  90       ASSERT (Descriptor->ResType <
  91               (sizeof (mPciHostBridgeLibAcpiAddressSpaceTypeStr) /
  92                sizeof (mPciHostBridgeLibAcpiAddressSpaceTypeStr[0])
  93                )
  94               );
  95       DEBUG ((EFI_D_ERROR, " %s: Length/Alignment = 0x%lx / 0x%lx\n",
  96               mPciHostBridgeLibAcpiAddressSpaceTypeStr[Descriptor->ResType],
  97               Descriptor->AddrLen, Descriptor->AddrRangeMax
  98               ));
  99       if (Descriptor->ResType == ACPI_ADDRESS_SPACE_TYPE_MEM) {
 100         DEBUG ((EFI_D_ERROR, "     Granularity/SpecificFlag = %ld / %02x%s\n",
 101                 Descriptor->AddrSpaceGranularity, Descriptor->SpecificFlag,
 102                 ((Descriptor->SpecificFlag &
 103                   EFI_ACPI_MEMORY_RESOURCE_SPECIFIC_FLAG_CACHEABLE_PREFETCHABLE
 104                   ) != 0) ? L" (Prefetchable)" : L""
 105                 ));
 106       }
 107     }
 108     //
 109     // Skip the END descriptor for root bridge
 110     //
 111     ASSERT (Descriptor->Desc == ACPI_END_TAG_DESCRIPTOR);
 112     Descriptor = (EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *)(
 113                    (EFI_ACPI_END_TAG_DESCRIPTOR *)Descriptor + 1
 114                    );
 115   }
 116 }