OvmfPkg/Bhyve/AcpiPlatformDxe/EntryPoint.c

   1 /** @file
   2   Entry point of OVMF ACPI Platform Driver
   3
   4   Copyright (C) 2015, Red Hat, Inc.
   5   Copyright (c) 2008 - 2015, Intel Corporation. All rights reserved.<BR>
   6
   7   SPDX-License-Identifier: BSD-2-Clause-Patent
   8 **/
   9
  10 #include <Guid/RootBridgesConnectedEventGroup.h>
  11 #include "AcpiPlatform.h"
  12
  13 STATIC
  14 EFI_ACPI_TABLE_PROTOCOL *
  15 FindAcpiTableProtocol (
  16   VOID
  17   )
  18 {
  19   EFI_STATUS               Status;
  20   EFI_ACPI_TABLE_PROTOCOL  *AcpiTable;
  21
  22   Status = gBS->LocateProtocol (
  23                   &gEfiAcpiTableProtocolGuid,
  24                   NULL,
  25                   (VOID **)&AcpiTable
  26                   );
  27   ASSERT_EFI_ERROR (Status);
  28   return AcpiTable;
  29 }
  30
  31 STATIC
  32 VOID
  33 EFIAPI
  34 OnRootBridgesConnected (
  35   IN EFI_EVENT  Event,
  36   IN VOID       *Context
  37   )
  38 {
  39   EFI_STATUS  Status;
  40
  41   DEBUG ((
  42     DEBUG_INFO,
  43     "%a: root bridges have been connected, installing ACPI tables\n",
  44     __FUNCTION__
  45     ));
  46   Status = InstallAcpiTables (FindAcpiTableProtocol ());
  47   if (EFI_ERROR (Status)) {
  48     DEBUG ((DEBUG_ERROR, "%a: InstallAcpiTables: %r\n", __FUNCTION__, Status));
  49   }
  50
  51   gBS->CloseEvent (Event);
  52 }
  53
  54 EFI_STATUS
  55 EFIAPI
  56 AcpiPlatformEntryPoint (
  57   IN EFI_HANDLE        ImageHandle,
  58   IN EFI_SYSTEM_TABLE  *SystemTable
  59   )
  60 {
  61   EFI_STATUS  Status;
  62   EFI_EVENT   RootBridgesConnected;
  63
  64   //
  65   // If the platform doesn't support PCI, or PCI enumeration has been disabled,
  66   // install the tables at once, and let the entry point's return code reflect
  67   // the full functionality.
  68   //
  69   if (PcdGetBool (PcdPciDisableBusEnumeration)) {
  70     DEBUG ((
  71       DEBUG_INFO,
  72       "%a: PCI or its enumeration disabled, installing "
  73       "ACPI tables\n",
  74       __FUNCTION__
  75       ));
  76     return InstallAcpiTables (FindAcpiTableProtocol ());
  77   }
  78
  79   //
  80   // Otherwise, delay installing the ACPI tables until root bridges are
  81   // connected. The entry point's return status will only reflect the callback
  82   // setup. (Note that we're a DXE_DRIVER; our entry point function is invoked
  83   // strictly before BDS is entered and can connect the root bridges.)
  84   //
  85   Status = gBS->CreateEventEx (
  86                   EVT_NOTIFY_SIGNAL,
  87                   TPL_CALLBACK,
  88                   OnRootBridgesConnected,
  89                   NULL /* Context */,
  90                   &gRootBridgesConnectedEventGroupGuid,
  91                   &RootBridgesConnected
  92                   );
  93   if (!EFI_ERROR (Status)) {
  94     DEBUG ((
  95       DEBUG_INFO,
  96       "%a: waiting for root bridges to be connected, registered callback\n",
  97       __FUNCTION__
  98       ));
  99   }
 100
 101   return Status;
 102 }