mirror of https://github.com/acidanthera/audk.git
117 lines
3.3 KiB
C
117 lines
3.3 KiB
C
/** @file
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Entry point of OVMF ACPI Platform Driver
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Copyright (C) 2015, Red Hat, Inc.
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Copyright (c) 2008 - 2015, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials are licensed and made available
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under the terms and conditions of the BSD License which accompanies this
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distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT
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WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include <Protocol/PciEnumerationComplete.h>
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#include "AcpiPlatform.h"
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STATIC
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EFI_ACPI_TABLE_PROTOCOL *
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FindAcpiTableProtocol (
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VOID
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)
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{
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EFI_STATUS Status;
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EFI_ACPI_TABLE_PROTOCOL *AcpiTable;
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Status = gBS->LocateProtocol (
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&gEfiAcpiTableProtocolGuid,
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NULL,
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(VOID**)&AcpiTable
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);
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ASSERT_EFI_ERROR (Status);
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return AcpiTable;
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}
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STATIC
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VOID
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EFIAPI
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OnPciEnumerated (
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IN EFI_EVENT Event,
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IN VOID *Context
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)
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{
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EFI_STATUS Status;
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DEBUG ((EFI_D_INFO, "%a: PCI enumeration complete, installing ACPI tables\n",
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__FUNCTION__));
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Status = InstallAcpiTables (FindAcpiTableProtocol ());
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if (EFI_ERROR (Status)) {
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DEBUG ((EFI_D_ERROR, "%a: InstallAcpiTables: %r\n", __FUNCTION__, Status));
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}
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gBS->CloseEvent (Event);
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}
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EFI_STATUS
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EFIAPI
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AcpiPlatformEntryPoint (
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IN EFI_HANDLE ImageHandle,
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IN EFI_SYSTEM_TABLE *SystemTable
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)
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{
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EFI_STATUS Status;
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VOID *Interface;
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EFI_EVENT PciEnumerated;
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VOID *Registration;
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//
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// If the platform doesn't support PCI, or PCI enumeration has been disabled,
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// install the tables at once, and let the entry point's return code reflect
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// the full functionality.
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//
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if (PcdGetBool (PcdPciDisableBusEnumeration)) {
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DEBUG ((EFI_D_INFO, "%a: PCI or its enumeration disabled, installing "
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"ACPI tables\n", __FUNCTION__));
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return InstallAcpiTables (FindAcpiTableProtocol ());
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}
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//
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// Similarly, if PCI enumeration has already completed, install the tables
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// immediately.
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//
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Status = gBS->LocateProtocol (&gEfiPciEnumerationCompleteProtocolGuid,
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NULL /* Registration */, &Interface);
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if (!EFI_ERROR (Status)) {
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DEBUG ((EFI_D_INFO, "%a: PCI enumeration already complete, "
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"installing ACPI tables\n", __FUNCTION__));
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return InstallAcpiTables (FindAcpiTableProtocol ());
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}
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ASSERT (Status == EFI_NOT_FOUND);
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//
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// Otherwise, delay installing the ACPI tables until PCI enumeration
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// completes. The entry point's return status will only reflect the callback
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// setup.
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//
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Status = gBS->CreateEvent (EVT_NOTIFY_SIGNAL, TPL_CALLBACK, OnPciEnumerated,
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NULL /* Context */, &PciEnumerated);
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if (EFI_ERROR (Status)) {
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return Status;
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}
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Status = gBS->RegisterProtocolNotify (
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&gEfiPciEnumerationCompleteProtocolGuid, PciEnumerated,
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&Registration);
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if (EFI_ERROR (Status)) {
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gBS->CloseEvent (PciEnumerated);
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} else {
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DEBUG ((EFI_D_INFO, "%a: PCI enumeration pending, registered callback\n",
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__FUNCTION__));
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}
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return Status;
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}
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