The explanation is in the patch titled
OvmfPkg: introduce gRootBridgesConnectedEventGroupGuid
At this point, this signal doesn't do anything yet.
Cc: Ard Biesheuvel <ard.biesheu...@linaro.org>
Cc: Jordan Justen <jordan.l.jus...@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <ler...@redhat.com>
---
Notes:
v2:
- replace protocol with event group [Jordan]
OvmfPkg/Library/PlatformBdsLib/PlatformBdsLib.inf | 1 +
OvmfPkg/Library/PlatformBdsLib/BdsPlatform.c | 6 ++++++
2 files changed, 7 insertions(+)
diff --git a/OvmfPkg/Library/PlatformBdsLib/PlatformBdsLib.inf
b/OvmfPkg/Library/PlatformBdsLib/PlatformBdsLib.inf
index ab5468368da5..6a04b458032f 100644
--- a/OvmfPkg/Library/PlatformBdsLib/PlatformBdsLib.inf
+++ b/OvmfPkg/Library/PlatformBdsLib/PlatformBdsLib.inf
@@ -66,7 +66,8 @@ [Protocols]
gEfiDecompressProtocolGuid
gEfiPciRootBridgeIoProtocolGuid
gEfiS3SaveStateProtocolGuid # PROTOCOL SOMETIMES_CONSUMED
gEfiDxeSmmReadyToLockProtocolGuid # PROTOCOL SOMETIMES_PRODUCED
[Guids]
gEfiEndOfDxeEventGroupGuid
+ gRootBridgesConnectedEventGroupGuid
diff --git a/OvmfPkg/Library/PlatformBdsLib/BdsPlatform.c
b/OvmfPkg/Library/PlatformBdsLib/BdsPlatform.c
index 4a2f7f332d34..0bc02baf0371 100644
--- a/OvmfPkg/Library/PlatformBdsLib/BdsPlatform.c
+++ b/OvmfPkg/Library/PlatformBdsLib/BdsPlatform.c
@@ -9,14 +9,15 @@
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#include "BdsPlatform.h"
+#include <Guid/RootBridgesConnectedEventGroup.h>
#include <Library/QemuBootOrderLib.h>
//
// Global data
//
@@ -1241,14 +1242,19 @@ Returns:
DEBUG ((EFI_D_INFO, "PlatformBdsPolicyBehavior\n"));
VisitAllInstancesOfProtocol (&gEfiPciRootBridgeIoProtocolGuid,
ConnectRootBridge, NULL);
//
+ // Signal the ACPI platform driver that it can download QEMU ACPI tables.
+ //
+ EfiEventGroupSignal (&gRootBridgesConnectedEventGroupGuid);
+
+ //
// We can't signal End-of-Dxe earlier than this. Namely, End-of-Dxe triggers
// the preparation of S3 system information. That logic has a hard dependency
// on the presence of the FACS ACPI table. Since our ACPI tables are only
// installed after PCI enumeration completes, we must not trigger the S3 save
// earlier, hence we can't signal End-of-Dxe earlier.
//
EfiEventGroupSignal (&gEfiEndOfDxeEventGroupGuid);
--
1.8.3.1
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