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.per...@citrix.com>
---
Change in V3:
- use the variable mMyDevice to prevent the driver from
starting twice (if there is two different PCI devices).
- free(dev) on exit
---
OvmfPkg/XenBusDxe/XenBusDxe.c | 56 +++++++++++++++++++++++++++++++++++++++++--
OvmfPkg/XenBusDxe/XenBusDxe.h | 11 +++++++++
2 files changed, 65 insertions(+), 2 deletions(-)
diff --git a/OvmfPkg/XenBusDxe/XenBusDxe.c b/OvmfPkg/XenBusDxe/XenBusDxe.c
index 7f297bd..f3c74e1 100644
--- a/OvmfPkg/XenBusDxe/XenBusDxe.c
+++ b/OvmfPkg/XenBusDxe/XenBusDxe.c
@@ -43,6 +43,9 @@ EFI_DRIVER_BINDING_PROTOCOL gXenBusDxeDriverBinding = {
};
+STATIC EFI_LOCK mMyDeviceLock = EFI_INITIALIZE_LOCK_VARIABLE
(TPL_CALLBACK);
+STATIC XENBUS_DEVICE *mMyDevice = NULL;
+
/**
Unloads an image.
@@ -216,6 +219,19 @@ 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.
@@ -259,7 +275,37 @@ 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;
+
+ EfiAcquireLock (&mMyDeviceLock);
+ if (mMyDevice != NULL) {
+ EfiReleaseLock (&mMyDeviceLock);
+ //
+ // There is already a XenBus running, only one can be used at a time.
+ //
+ Status = EFI_ALREADY_STARTED;
+ goto ErrorAllocated;
+ }
+ mMyDevice = Dev;
+ EfiReleaseLock (&mMyDeviceLock);
+
+ Status = gBS->CreateEvent (EVT_SIGNAL_EXIT_BOOT_SERVICES, TPL_CALLBACK,
+ NotifyExitBoot,
+ (VOID*) Dev,
+ &Dev->ExitBootEvent);
+ ASSERT_EFI_ERROR (Status);
+
+ return EFI_SUCCESS;
+
+ErrorAllocated:
+ FreePool (Dev);
+ return Status;
}
/**
@@ -297,5 +343,11 @@ XenBusDxeDriverBindingStop (
IN EFI_HANDLE *ChildHandleBuffer OPTIONAL
)
{
- return EFI_UNSUPPORTED;
+ XENBUS_DEVICE *Dev = mMyDevice;
+
+ gBS->CloseEvent (Dev->ExitBootEvent);
+
+ mMyDevice = NULL;
+ FreePool (Dev);
+ return EFI_SUCCESS;
}
diff --git a/OvmfPkg/XenBusDxe/XenBusDxe.h b/OvmfPkg/XenBusDxe/XenBusDxe.h
index bcd9f3c..d7537f3 100644
--- a/OvmfPkg/XenBusDxe/XenBusDxe.h
+++ b/OvmfPkg/XenBusDxe/XenBusDxe.h
@@ -74,4 +74,15 @@ 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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