OvmfPkg/XenBusDxe: Introduce XenBus support itself.

This is a bus-like on top of XenStore. It will look for advertised
ParaVirtualized devices and initialize them by producing XenBus
protocol.

Change in V4:
- Replace the license by the commonly used file header text.
- Clean XenBus.h header (remove copyright that does not belong to the
  file anymore; and rewrite the brief description of the file)
- Fix description on the function

Change in V3:
- Insert to ChildList later, once populated.
- Remove XENBUS_XENSTORE_NODE macro.
- add comment to XenBusAddDevice and XenBusEnumerateBus about
  concurrency calls.
- Add a description to the introduced member to the protocol.

Change in V2:
- comment, file header
- Fix comment style
- Error handling in the main init function
- coding style
- Fix error path in add device.

Origin: FreeBSD 10.0
License: This patch adds XenBus.c which is under the MIT licence.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Acked-by: Jordan Justen <jordan.l.justen@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16270 6f19259b-4bc3-4df7-8a09-765794883524

1 files changed, 19 insertions, 0 deletions

diff --git a/OvmfPkg/XenBusDxe/XenBusDxe.h b/OvmfPkg/XenBusDxe/XenBusDxe.h
index 6be5c58d92..11640223eb 100644
--- a/OvmfPkg/XenBusDxe/XenBusDxe.h
+++ b/OvmfPkg/XenBusDxe/XenBusDxe.h
@@ -82,6 +82,7 @@ extern EFI_COMPONENT_NAME_PROTOCOL  gXenBusDxeComponentName;
 #define PCI_DEVICE_ID_XEN_PLATFORM       0x0001

 

 

+typedef struct _XENBUS_DEVICE_PATH XENBUS_DEVICE_PATH;

 typedef struct _XENBUS_DEVICE XENBUS_DEVICE;

 

 // Have the state of the driver.

@@ -92,11 +93,29 @@ struct _XENBUS_DEVICE {
   EFI_HANDLE                    ControllerHandle;

   EFI_PCI_IO_PROTOCOL           *PciIo;

   EFI_EVENT                     ExitBootEvent;

+  EFI_DEVICE_PATH_PROTOCOL      *DevicePath;

+  LIST_ENTRY                    ChildList;

 

   VOID                          *Hyperpage;

   shared_info_t                 *SharedInfo;

 };

 

+// There is one of this struct allocated for every child.

+#define XENBUS_PRIVATE_DATA_SIGNATURE SIGNATURE_32 ('X', 'B', 'p', 'd')

+typedef struct {

+    UINTN Signature;

+    LIST_ENTRY Link;

+    EFI_HANDLE Handle;

+    XENBUS_PROTOCOL XenBusIo;

+    XENBUS_DEVICE *Dev;

+    XENBUS_DEVICE_PATH *DevicePath;

+} XENBUS_PRIVATE_DATA;

+

+#define XENBUS_PRIVATE_DATA_FROM_THIS(a) \

+  CR (a, XENBUS_PRIVATE_DATA, XenBusIo, XENBUS_PRIVATE_DATA_SIGNATURE)

+#define XENBUS_PRIVATE_DATA_FROM_LINK(a) \

+  CR (a, XENBUS_PRIVATE_DATA, Link, XENBUS_PRIVATE_DATA_SIGNATURE)

+

 /*

  * Helpers

  */