Added a device attribute to capabilities - In progress

Followed the kernel physical memory reservation convention
with devices. Devices that are possessable by userspace
are created as boot-time capabilities and placed under the kernel
resources devmem_free capability list. Any userspace container
that is defined with the possession of the device would delete the
device capability making it unavailable to further requests.

include/l4/generic/cap-types.h

@@ -40,6 +40,8 @@
 	{(c)->type &= ~CAP_RTYPE_MASK;		\
 	 (c)->type |= CAP_RTYPE_MASK & rtype;}
 
+#define cap_devmem(c)	(c)->uattr
+
 /*
  * User-defined device-types
  * (Kept in the user field)

include/l4/generic/capability.h

@@ -71,8 +71,11 @@ struct capability {
 	unsigned long end;	/* Resource end value */
 	unsigned long size;	/* Resource size */
 
-	/* Used amount on resource _or_ user-defined attributes */
-	unsigned long user;
+	/* Use count of resource */
+	unsigned long used;
+
+	/* User-defined attributes on capability (like devtypes) */
+       	unsigned int uattr;
 };
 
 struct cap_list {

include/l4/generic/container.h

@@ -60,6 +60,7 @@ struct cap_info {
 	unsigned long start;
 	unsigned long end;
 	unsigned long size;
+	unsigned int uattr;	/* User-level attributes (like device types) */
 };