The explanation is in the patch titled
OvmfPkg: introduce gRootBusesConnectedProtocolGuid
At this point, this protocol doesn't do anything yet.
Cc: Ard Biesheuvel <ard.biesheu...@linaro.org>
Cc: Gerd Hoffmann <kra...@redhat.com>
Cc: Jordan Justen <jordan.l.jus...@intel.com>
Cc: Marcel Apfelbaum <mar...@redhat.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <ler...@redhat.com>
---
ArmVirtPkg/Library/PlatformIntelBdsLib/PlatformIntelBdsLib.inf | 1 +
ArmVirtPkg/Library/PlatformIntelBdsLib/IntelBdsPlatform.c | 11 +++++++++++
2 files changed, 12 insertions(+)
diff --git a/ArmVirtPkg/Library/PlatformIntelBdsLib/PlatformIntelBdsLib.inf
b/ArmVirtPkg/Library/PlatformIntelBdsLib/PlatformIntelBdsLib.inf
index 79ba7b2afbf7..bc0eab100319 100644
--- a/ArmVirtPkg/Library/PlatformIntelBdsLib/PlatformIntelBdsLib.inf
+++ b/ArmVirtPkg/Library/PlatformIntelBdsLib/PlatformIntelBdsLib.inf
@@ -74,7 +74,8 @@ [Guids]
[Protocols]
gEfiDevicePathProtocolGuid
gEfiGraphicsOutputProtocolGuid
gEfiLoadedImageProtocolGuid
gEfiPciRootBridgeIoProtocolGuid
gEfiSimpleFileSystemProtocolGuid
+ gRootBusesConnectedProtocolGuid
diff --git a/ArmVirtPkg/Library/PlatformIntelBdsLib/IntelBdsPlatform.c
b/ArmVirtPkg/Library/PlatformIntelBdsLib/IntelBdsPlatform.c
index b242a293a103..c8acfb1e86a6 100644
--- a/ArmVirtPkg/Library/PlatformIntelBdsLib/IntelBdsPlatform.c
+++ b/ArmVirtPkg/Library/PlatformIntelBdsLib/IntelBdsPlatform.c
@@ -21,14 +21,15 @@
#include <Library/PlatformBdsLib.h>
#include <Library/QemuBootOrderLib.h>
#include <Protocol/DevicePath.h>
#include <Protocol/GraphicsOutput.h>
#include <Protocol/PciIo.h>
#include <Protocol/PciRootBridgeIo.h>
#include <Guid/EventGroup.h>
+#include <Protocol/RootBusesConnected.h>
#include "IntelBdsPlatform.h"
#define DP_NODE_LEN(Type) { (UINT8)sizeof (Type), (UINT8)(sizeof (Type) >> 8) }
#pragma pack (1)
@@ -390,22 +391,32 @@ EFIAPI
PlatformBdsPolicyBehavior (
IN LIST_ENTRY *DriverOptionList,
IN LIST_ENTRY *BootOptionList,
IN PROCESS_CAPSULES ProcessCapsules,
IN BASEM_MEMORY_TEST BaseMemoryTest
)
{
+ EFI_STATUS Status;
+
//
// Locate the PCI root bridges and make the PCI bus driver connect each,
// non-recursively. This will produce a number of child handles with PciIo on
// them.
//
FilterAndProcess (&gEfiPciRootBridgeIoProtocolGuid, NULL, Connect);
//
+ // Signal the ACPI platform driver that it can download QEMU ACPI tables.
+ //
+ Status = gBS->InstallProtocolInterface (&gImageHandle,
+ &gRootBusesConnectedProtocolGuid, EFI_NATIVE_INTERFACE,
+ NULL);
+ ASSERT_EFI_ERROR (Status);
+
+ //
// Find all display class PCI devices (using the handles from the previous
// step), and connect them non-recursively. This should produce a number of
// child handles with GOPs on them.
//
FilterAndProcess (&gEfiPciIoProtocolGuid, IsPciDisplay, Connect);
//
--
1.8.3.1
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