[Xen-devel] [PATCH RFC 03/18] OvmfPkg/XenbusDxe: Add device state struct and create an ExitBoot services event.

[Anthony PERARD <anthony.perard@xxxxxxxxxx>]

The ExitBoot event is used to disconnect from the device before the
next operating system start using them.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
---
 OvmfPkg/XenbusDxe/XenbusDxe.c | 39 ++++++++++++++++++++++++++++++++++++---
 OvmfPkg/XenbusDxe/XenbusDxe.h | 10 ++++++++++
 2 files changed, 46 insertions(+), 3 deletions(-)

diff --git a/OvmfPkg/XenbusDxe/XenbusDxe.c b/OvmfPkg/XenbusDxe/XenbusDxe.c
index 14113ad..2c3d9b8 100644
--- a/OvmfPkg/XenbusDxe/XenbusDxe.c
+++ b/OvmfPkg/XenbusDxe/XenbusDxe.c
@@ -16,7 +16,6 @@
 
 #include "XenbusDxe.h"
 
-
 ///
 /// Driver Binding Protocol instance
 ///
@@ -30,6 +29,8 @@ EFI_DRIVER_BINDING_PROTOCOL gXenbusDxeDriverBinding = {
 };
 
 
+XENBUS_DEVICE *mMyDevice;
+
 /**
   Unloads an image.
 
@@ -229,6 +230,19 @@ XenbusDxeDriverBindingSupported (
   return Status;
 }
 
+VOID
+EFIAPI
+NotifyExitBoot (
+  IN EFI_EVENT Event,
+  IN VOID *Context
+  )
+{
+  XENBUS_DEVICE *Dev = Context;
+
+  gBS->DisconnectController(Dev->ControllerHandle,
+                            Dev->This->DriverBindingHandle, NULL);
+}
+
 /**
   Starts a device controller or a bus controller.
 
@@ -272,7 +286,22 @@ XenbusDxeDriverBindingStart (
   IN EFI_DEVICE_PATH_PROTOCOL     *RemainingDevicePath OPTIONAL
   )
 {
-  return EFI_UNSUPPORTED;
+  EFI_STATUS Status;
+  XENBUS_DEVICE *Dev;
+
+  Dev = AllocateZeroPool (sizeof (*Dev));
+  Dev->Signature = XENBUS_DEVICE_SIGNATURE;
+  Dev->This = This;
+  Dev->ControllerHandle = ControllerHandle;
+
+  Status = gBS->CreateEvent (EVT_SIGNAL_EXIT_BOOT_SERVICES, TPL_CALLBACK,
+                             NotifyExitBoot,
+                             (VOID*) Dev,
+                             &Dev->ExitBootEvent);
+  ASSERT_EFI_ERROR (Status);
+
+  mMyDevice = Dev;
+  return EFI_SUCCESS;
 }
 
 /**
@@ -310,5 +339,9 @@ XenbusDxeDriverBindingStop (
   IN EFI_HANDLE                   *ChildHandleBuffer OPTIONAL
   )
 {
-  return EFI_UNSUPPORTED;
+  XENBUS_DEVICE *Dev = mMyDevice;
+
+  gBS->CloseEvent (Dev->ExitBootEvent);
+
+  return EFI_SUCCESS;
 }
diff --git a/OvmfPkg/XenbusDxe/XenbusDxe.h b/OvmfPkg/XenbusDxe/XenbusDxe.h
index 6f22732..c1ca87a 100644
--- a/OvmfPkg/XenbusDxe/XenbusDxe.h
+++ b/OvmfPkg/XenbusDxe/XenbusDxe.h
@@ -75,4 +75,14 @@ extern EFI_COMPONENT_NAME_PROTOCOL  gXenbusDxeComponentName;
 #define PCI_DEVICE_ID_XEN_PLATFORM       0x0001
 
 
+typedef struct _XENBUS_DEVICE XENBUS_DEVICE;
+
+#define XENBUS_DEVICE_SIGNATURE SIGNATURE_32 ('X','B','b','d')
+struct _XENBUS_DEVICE {
+  UINT32                        Signature;
+  EFI_DRIVER_BINDING_PROTOCOL   *This;
+  EFI_HANDLE                    ControllerHandle;
+  EFI_EVENT                     ExitBootEvent;
+};
+
 #endif
-- 
Anthony PERARD


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