The explanation is in the patch titled OvmfPkg: introduce gRootBusesConnectedProtocolGuid
At this point, this protocol doesn't do anything yet. Cc: Ard Biesheuvel <[email protected]> Cc: Gerd Hoffmann <[email protected]> Cc: Jordan Justen <[email protected]> Cc: Marcel Apfelbaum <[email protected]> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Laszlo Ersek <[email protected]> --- OvmfPkg/Library/PlatformBdsLib/PlatformBdsLib.inf | 1 + OvmfPkg/Library/PlatformBdsLib/BdsPlatform.c | 9 +++++++++ 2 files changed, 10 insertions(+) diff --git a/OvmfPkg/Library/PlatformBdsLib/PlatformBdsLib.inf b/OvmfPkg/Library/PlatformBdsLib/PlatformBdsLib.inf index ab5468368da5..9a53aa02b84e 100644 --- a/OvmfPkg/Library/PlatformBdsLib/PlatformBdsLib.inf +++ b/OvmfPkg/Library/PlatformBdsLib/PlatformBdsLib.inf @@ -63,10 +63,11 @@ [Pcd.IA32, Pcd.X64] gEfiMdePkgTokenSpaceGuid.PcdFSBClock [Protocols] gEfiDecompressProtocolGuid gEfiPciRootBridgeIoProtocolGuid gEfiS3SaveStateProtocolGuid # PROTOCOL SOMETIMES_CONSUMED gEfiDxeSmmReadyToLockProtocolGuid # PROTOCOL SOMETIMES_PRODUCED + gRootBusesConnectedProtocolGuid # PROTOCOL ALWAYS_PRODUCED [Guids] gEfiEndOfDxeEventGroupGuid diff --git a/OvmfPkg/Library/PlatformBdsLib/BdsPlatform.c b/OvmfPkg/Library/PlatformBdsLib/BdsPlatform.c index 0abba98dfe03..a527f6aaff2c 100644 --- a/OvmfPkg/Library/PlatformBdsLib/BdsPlatform.c +++ b/OvmfPkg/Library/PlatformBdsLib/BdsPlatform.c @@ -10,14 +10,15 @@ 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 <Library/QemuBootOrderLib.h> +#include <Protocol/RootBusesConnected.h> // // Global data // VOID *mEfiDevPathNotifyReg; @@ -1263,14 +1264,22 @@ Returns: DEBUG ((EFI_D_INFO, "PlatformBdsPolicyBehavior\n")); VisitAllInstancesOfProtocol (&gEfiPciRootBridgeIoProtocolGuid, ConnectRootBridge, NULL); // + // 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); + + // // 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. // Status = gBS->CreateEventEx (EVT_NOTIFY_SIGNAL, TPL_CALLBACK, OnEndOfDxe, -- 1.8.3.1 _______________________________________________ edk2-devel mailing list [email protected] https://lists.01.org/mailman/listinfo/edk2-devel
