91 lines
2.3 KiB
C
91 lines
2.3 KiB
C
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/** @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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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <Guid/RootBridgesConnectedEventGroup.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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OnRootBridgesConnected (
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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,
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"%a: root bridges have been connected, 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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EFI_EVENT RootBridgesConnected;
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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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// Otherwise, delay installing the ACPI tables until root bridges are
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// connected. The entry point's return status will only reflect the callback
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// setup. (Note that we're a DXE_DRIVER; our entry point function is invoked
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// strictly before BDS is entered and can connect the root bridges.)
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//
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Status = gBS->CreateEventEx (EVT_NOTIFY_SIGNAL, TPL_CALLBACK,
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OnRootBridgesConnected, NULL /* Context */,
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&gRootBridgesConnectedEventGroupGuid, &RootBridgesConnected);
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if (!EFI_ERROR (Status)) {
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DEBUG ((EFI_D_INFO,
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"%a: waiting for root bridges to be connected, 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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