OvmfPkg/PciHostBridgeLib: Extract GetRootBridges() / FreeRootBridges()

[mirror_edk2.git] / OvmfPkg / Include / Library / PciHostBridgeUtilityLib.h

/** @file\r
  Provide common utility functions to PciHostBridgeLib instances in\r
  ArmVirtPkg and OvmfPkg.\r
\r
  Copyright (C) 2016, Red Hat, Inc.\r
  Copyright (c) 2016, Intel Corporation. All rights reserved.<BR>\r
  Copyright (c) 2020, Huawei Corporation. All rights reserved.<BR>\r
\r
  SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
**/\r
\r
#ifndef __PCI_HOST_BRIDGE_UTILITY_LIB_H__\r
#define __PCI_HOST_BRIDGE_UTILITY_LIB_H__\r
\r
\r
#include <Library/PciHostBridgeLib.h>\r
\r
\r
/**\r
  Utility function to initialize a PCI_ROOT_BRIDGE structure.\r
\r
  @param[in]  Supports               Supported attributes.\r
\r
  @param[in]  Attributes             Initial attributes.\r
\r
  @param[in]  AllocAttributes        Allocation attributes.\r
\r
  @param[in]  DmaAbove4G             DMA above 4GB memory.\r
\r
  @param[in]  NoExtendedConfigSpace  No Extended Config Space.\r
\r
  @param[in]  RootBusNumber          The bus number to store in RootBus.\r
\r
  @param[in]  MaxSubBusNumber        The inclusive maximum bus number that can\r
                                     be assigned to any subordinate bus found\r
                                     behind any PCI bridge hanging off this\r
                                     root bus.\r
\r
                                     The caller is repsonsible for ensuring\r
                                     that RootBusNumber <= MaxSubBusNumber. If\r
                                     RootBusNumber equals MaxSubBusNumber, then\r
                                     the root bus has no room for subordinate\r
                                     buses.\r
\r
  @param[in]  Io                     IO aperture.\r
\r
  @param[in]  Mem                    MMIO aperture.\r
\r
  @param[in]  MemAbove4G             MMIO aperture above 4G.\r
\r
  @param[in]  PMem                   Prefetchable MMIO aperture.\r
\r
  @param[in]  PMemAbove4G            Prefetchable MMIO aperture above 4G.\r
\r
  @param[out] RootBus                The PCI_ROOT_BRIDGE structure (allocated\r
                                     by the caller) that should be filled in by\r
                                     this function.\r
\r
  @retval EFI_SUCCESS                Initialization successful. A device path\r
                                     consisting of an ACPI device path node,\r
                                     with UID = RootBusNumber, has been\r
                                     allocated and linked into RootBus.\r
\r
  @retval EFI_OUT_OF_RESOURCES       Memory allocation failed.\r
**/\r
EFI_STATUS\r
EFIAPI\r
PciHostBridgeUtilityInitRootBridge (\r
  IN  UINT64                   Supports,\r
  IN  UINT64                   Attributes,\r
  IN  UINT64                   AllocAttributes,\r
  IN  BOOLEAN                  DmaAbove4G,\r
  IN  BOOLEAN                  NoExtendedConfigSpace,\r
  IN  UINT8                    RootBusNumber,\r
  IN  UINT8                    MaxSubBusNumber,\r
  IN  PCI_ROOT_BRIDGE_APERTURE *Io,\r
  IN  PCI_ROOT_BRIDGE_APERTURE *Mem,\r
  IN  PCI_ROOT_BRIDGE_APERTURE *MemAbove4G,\r
  IN  PCI_ROOT_BRIDGE_APERTURE *PMem,\r
  IN  PCI_ROOT_BRIDGE_APERTURE *PMemAbove4G,\r
  OUT PCI_ROOT_BRIDGE          *RootBus\r
  );\r
\r
\r
/**\r
  Utility function to uninitialize a PCI_ROOT_BRIDGE structure set up with\r
  PciHostBridgeUtilityInitRootBridge().\r
\r
  @param[in] RootBus  The PCI_ROOT_BRIDGE structure, allocated by the caller and\r
                      initialized with PciHostBridgeUtilityInitRootBridge(),\r
                      that should be uninitialized. This function doesn't free\r
                      RootBus.\r
**/\r
VOID\r
EFIAPI\r
PciHostBridgeUtilityUninitRootBridge (\r
  IN PCI_ROOT_BRIDGE *RootBus\r
  );\r
\r
\r
/**\r
  Utility function to return all the root bridge instances in an array.\r
\r
  @param[out] Count            The number of root bridge instances.\r
\r
  @param[in]  Attributes       Initial attributes.\r
\r
  @param[in]  AllocAttributes  Allocation attributes.\r
\r
  @param[in]  Io               IO aperture.\r
\r
  @param[in]  Mem              MMIO aperture.\r
\r
  @param[in]  MemAbove4G       MMIO aperture above 4G.\r
\r
  @param[in]  PMem             Prefetchable MMIO aperture.\r
\r
  @param[in]  PMemAbove4G      Prefetchable MMIO aperture above 4G.\r
\r
  @return                      All the root bridge instances in an array.\r
**/\r
PCI_ROOT_BRIDGE *\r
EFIAPI\r
PciHostBridgeUtilityGetRootBridges (\r
  OUT UINTN                    *Count,\r
  IN  UINT64                   Attributes,\r
  IN  UINT64                   AllocationAttributes,\r
  IN  PCI_ROOT_BRIDGE_APERTURE *Io,\r
  IN  PCI_ROOT_BRIDGE_APERTURE *Mem,\r
  IN  PCI_ROOT_BRIDGE_APERTURE *MemAbove4G,\r
  IN  PCI_ROOT_BRIDGE_APERTURE *PMem,\r
  IN  PCI_ROOT_BRIDGE_APERTURE *PMemAbove4G\r
  );\r
\r
\r
/**\r
  Utility function to free root bridge instances array from\r
  PciHostBridgeUtilityGetRootBridges().\r
\r
  @param[in] Bridges  The root bridge instances array.\r
  @param[in] Count    The count of the array.\r
**/\r
VOID\r
EFIAPI\r
PciHostBridgeUtilityFreeRootBridges (\r
  IN PCI_ROOT_BRIDGE *Bridges,\r
  IN UINTN           Count\r
  );\r
\r
\r
/**\r
  Utility function to inform the platform that the resource conflict happens.\r
\r
  @param[in] Configuration  Pointer to PCI I/O and PCI memory resource\r
                            descriptors. The Configuration contains the\r
                            resources for all the root bridges. The resource\r
                            for each root bridge is terminated with END\r
                            descriptor and an additional END is appended\r
                            indicating the end of the entire resources. The\r
                            resource descriptor field values follow the\r
                            description in\r
                            EFI_PCI_HOST_BRIDGE_RESOURCE_ALLOCATION_PROTOCOL\r
                            .SubmitResources().\r
**/\r
VOID\r
EFIAPI\r
PciHostBridgeUtilityResourceConflict (\r
  IN VOID  *Configuration\r
  );\r
\r
\r
#endif // __PCI_HOST_BRIDGE_UTILITY_LIB_H__\r