OvmfPkg/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   This program and the accompanying materials are licensed and made available
   8   under the terms and conditions of the BSD License which accompanies this
   9   distribution.  The full text of the license may be found at
  10   http://opensource.org/licenses/bsd-license.php
  11
  12   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT
  13   WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  14 **/
  15
  16 #include <Protocol/PciEnumerationComplete.h>
  17 #include "AcpiPlatform.h"
  18
  19 STATIC
  20 EFI_ACPI_TABLE_PROTOCOL *
  21 FindAcpiTableProtocol (
  22   VOID
  23   )
  24 {
  25   EFI_STATUS              Status;
  26   EFI_ACPI_TABLE_PROTOCOL *AcpiTable;
  27
  28   Status = gBS->LocateProtocol (
  29                   &gEfiAcpiTableProtocolGuid,
  30                   NULL,
  31                   (VOID**)&AcpiTable
  32                   );
  33   ASSERT_EFI_ERROR (Status);
  34   return AcpiTable;
  35 }
  36
  37
  38 STATIC
  39 VOID
  40 EFIAPI
  41 OnPciEnumerated (
  42   IN EFI_EVENT Event,
  43   IN VOID      *Context
  44   )
  45 {
  46   EFI_STATUS Status;
  47
  48   DEBUG ((EFI_D_INFO, "%a: PCI enumeration complete, installing ACPI tables\n",
  49     __FUNCTION__));
  50   Status = InstallAcpiTables (FindAcpiTableProtocol ());
  51   if (EFI_ERROR (Status)) {
  52     DEBUG ((EFI_D_ERROR, "%a: InstallAcpiTables: %r\n", __FUNCTION__, Status));
  53   }
  54   gBS->CloseEvent (Event);
  55 }
  56
  57
  58 EFI_STATUS
  59 EFIAPI
  60 AcpiPlatformEntryPoint (
  61   IN EFI_HANDLE         ImageHandle,
  62   IN EFI_SYSTEM_TABLE   *SystemTable
  63   )
  64 {
  65   EFI_STATUS Status;
  66   VOID       *Interface;
  67   EFI_EVENT  PciEnumerated;
  68   VOID       *Registration;
  69
  70   //
  71   // If the platform doesn't support PCI, or PCI enumeration has been disabled,
  72   // install the tables at once, and let the entry point's return code reflect
  73   // the full functionality.
  74   //
  75   if (PcdGetBool (PcdPciDisableBusEnumeration)) {
  76     DEBUG ((EFI_D_INFO, "%a: PCI or its enumeration disabled, installing "
  77       "ACPI tables\n", __FUNCTION__));
  78     return InstallAcpiTables (FindAcpiTableProtocol ());
  79   }
  80
  81   //
  82   // Similarly, if PCI enumeration has already completed, install the tables
  83   // immediately.
  84   //
  85   Status = gBS->LocateProtocol (&gEfiPciEnumerationCompleteProtocolGuid,
  86                   NULL /* Registration */, &Interface);
  87   if (!EFI_ERROR (Status)) {
  88     DEBUG ((EFI_D_INFO, "%a: PCI enumeration already complete, "
  89       "installing ACPI tables\n", __FUNCTION__));
  90     return InstallAcpiTables (FindAcpiTableProtocol ());
  91   }
  92   ASSERT (Status == EFI_NOT_FOUND);
  93
  94   //
  95   // Otherwise, delay installing the ACPI tables until PCI enumeration
  96   // completes. The entry point's return status will only reflect the callback
  97   // setup.
  98   //
  99   Status = gBS->CreateEvent (EVT_NOTIFY_SIGNAL, TPL_CALLBACK, OnPciEnumerated,
 100                   NULL /* Context */, &PciEnumerated);
 101   if (EFI_ERROR (Status)) {
 102     return Status;
 103   }
 104
 105   Status = gBS->RegisterProtocolNotify (
 106                   &gEfiPciEnumerationCompleteProtocolGuid, PciEnumerated,
 107                   &Registration);
 108   if (EFI_ERROR (Status)) {
 109     gBS->CloseEvent (PciEnumerated);
 110   } else {
 111     DEBUG ((EFI_D_INFO, "%a: PCI enumeration pending, registered callback\n",
 112       __FUNCTION__));
 113   }
 114
 115   return Status;
 116 }