On 23 March 2016 at 15:46, Laszlo Ersek <ler...@redhat.com> wrote:
> 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>
Reviewed-by: Ard Biesheuvel <ard.biesheu...@linaro.org>
> ---
>
> Notes:
> v2:
> - replace protocol with event group [Jordan]
>
> ArmVirtPkg/Library/PlatformIntelBdsLib/PlatformIntelBdsLib.inf | 1 +
> ArmVirtPkg/Library/PlatformIntelBdsLib/IntelBdsPlatform.c | 6 ++++++
> 2 files changed, 7 insertions(+)
>
> diff --git a/ArmVirtPkg/Library/PlatformIntelBdsLib/PlatformIntelBdsLib.inf
> b/ArmVirtPkg/Library/PlatformIntelBdsLib/PlatformIntelBdsLib.inf
> index 79ba7b2afbf7..f104accc0334 100644
> --- a/ArmVirtPkg/Library/PlatformIntelBdsLib/PlatformIntelBdsLib.inf
> +++ b/ArmVirtPkg/Library/PlatformIntelBdsLib/PlatformIntelBdsLib.inf
> @@ -67,14 +67,15 @@ [Pcd]
> gArmVirtTokenSpaceGuid.PcdTerminalTypeGuidBuffer
>
> [Guids]
> gEfiFileInfoGuid
> gEfiFileSystemInfoGuid
> gEfiFileSystemVolumeLabelInfoIdGuid
> gEfiEndOfDxeEventGroupGuid
> + gRootBridgesConnectedEventGroupGuid
>
> [Protocols]
> gEfiDevicePathProtocolGuid
> gEfiGraphicsOutputProtocolGuid
> gEfiLoadedImageProtocolGuid
> gEfiPciRootBridgeIoProtocolGuid
> gEfiSimpleFileSystemProtocolGuid
> diff --git a/ArmVirtPkg/Library/PlatformIntelBdsLib/IntelBdsPlatform.c
> b/ArmVirtPkg/Library/PlatformIntelBdsLib/IntelBdsPlatform.c
> index 9267a188e810..02d698b455b3 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 <Guid/RootBridgesConnectedEventGroup.h>
>
> #include "IntelBdsPlatform.h"
>
> #define DP_NODE_LEN(Type) { (UINT8)sizeof (Type), (UINT8)(sizeof (Type) >>
> 8) }
>
>
> #pragma pack (1)
> @@ -366,14 +367,19 @@ PlatformBdsPolicyBehavior (
> // 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.
> + //
> + EfiEventGroupSignal (&gRootBridgesConnectedEventGroupGuid);
> +
> + //
> // 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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