[Xen-devel] [PATCH v2 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 | 38 ++++++++++++++++++++++++++++++++++++--
 OvmfPkg/XenBusDxe/XenBusDxe.h | 11 +++++++++++
 2 files changed, 47 insertions(+), 2 deletions(-)

diff --git a/OvmfPkg/XenBusDxe/XenBusDxe.c b/OvmfPkg/XenBusDxe/XenBusDxe.c
index a272204..e125ed7 100644
--- a/OvmfPkg/XenBusDxe/XenBusDxe.c
+++ b/OvmfPkg/XenBusDxe/XenBusDxe.c
@@ -59,6 +59,8 @@ EFI_DRIVER_BINDING_PROTOCOL gXenBusDxeDriverBinding = {
 };
 
 
+XENBUS_DEVICE *mMyDevice;
+
 /**
   Unloads an image.
 
@@ -232,6 +234,19 @@ 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 bus controller.
 
@@ -275,7 +290,22 @@ 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;
 }
 
 /**
@@ -313,5 +343,9 @@ 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 4c11f60..9e4860a 100644
--- a/OvmfPkg/XenBusDxe/XenBusDxe.h
+++ b/OvmfPkg/XenBusDxe/XenBusDxe.h
@@ -90,4 +90,15 @@ extern EFI_COMPONENT_NAME_PROTOCOL  gXenBusDxeComponentName;
 #define PCI_DEVICE_ID_XEN_PLATFORM       0x0001
 
 
+typedef struct _XENBUS_DEVICE XENBUS_DEVICE;
+
+// Have the state of the driver.
+#define XENBUS_DEVICE_SIGNATURE SIGNATURE_32 ('X','B','s','t')
+struct _XENBUS_DEVICE {
+  UINT32                        Signature;
+  EFI_DRIVER_BINDING_PROTOCOL   *This;
+  EFI_HANDLE                    ControllerHandle;
+  EFI_EVENT                     ExitBootEvent;
+};
+
 #endif
-- 
Anthony PERARD


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