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/** @file
Entry point of OVMF ACPI Platform Driver for Xen guests
Copyright (C) 2015-2021, Red Hat, Inc.
Copyright (c) 2008 - 2015, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <Guid/RootBridgesConnectedEventGroup.h> // gRootBridgesConnectedEve...
#include <Library/DebugLib.h> // DEBUG()
#include <Library/PcdLib.h> // PcdGetBool()
#include <Library/UefiBootServicesTableLib.h> // gBS
#include <Protocol/AcpiTable.h> // EFI_ACPI_TABLE_PROTOCOL
#include "AcpiPlatform.h"
STATIC
EFI_ACPI_TABLE_PROTOCOL *
FindAcpiTableProtocol (
VOID
)
{
EFI_STATUS Status;
EFI_ACPI_TABLE_PROTOCOL *AcpiTable;
Status = gBS->LocateProtocol (
&gEfiAcpiTableProtocolGuid,
NULL,
(VOID**)&AcpiTable
);
ASSERT_EFI_ERROR (Status);
return AcpiTable;
}
STATIC
VOID
EFIAPI
OnRootBridgesConnected (
IN EFI_EVENT Event,
IN VOID *Context
)
{
EFI_STATUS Status;
DEBUG ((DEBUG_INFO,
"%a: root bridges have been connected, installing ACPI tables\n",
__FUNCTION__));
Status = InstallAcpiTables (FindAcpiTableProtocol ());
if (EFI_ERROR (Status)) {
DEBUG ((DEBUG_ERROR, "%a: InstallAcpiTables: %r\n", __FUNCTION__, Status));
}
gBS->CloseEvent (Event);
}
EFI_STATUS
EFIAPI
AcpiPlatformEntryPoint (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_STATUS Status;
EFI_EVENT RootBridgesConnected;
//
// If the platform doesn't support PCI, or PCI enumeration has been disabled,
// install the tables at once, and let the entry point's return code reflect
// the full functionality.
//
if (PcdGetBool (PcdPciDisableBusEnumeration)) {
DEBUG ((DEBUG_INFO, "%a: PCI or its enumeration disabled, installing "
"ACPI tables\n", __FUNCTION__));
return InstallAcpiTables (FindAcpiTableProtocol ());
}
//
// Otherwise, delay installing the ACPI tables until root bridges are
// connected. The entry point's return status will only reflect the callback
// setup. (Note that we're a DXE_DRIVER; our entry point function is invoked
// strictly before BDS is entered and can connect the root bridges.)
//
Status = gBS->CreateEventEx (EVT_NOTIFY_SIGNAL, TPL_CALLBACK,
OnRootBridgesConnected, NULL /* Context */,
&gRootBridgesConnectedEventGroupGuid, &RootBridgesConnected);
if (!EFI_ERROR (Status)) {
DEBUG ((DEBUG_INFO,
"%a: waiting for root bridges to be connected, registered callback\n",
__FUNCTION__));
}
return Status;
}
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