Ongoing work for adding per-thread UTCB structures.

Added setting of utcb address to l4_thread_control.
This is going to be moved to exchange_registers() since we need to pass
both the utcb physical and virtual address and exregs fits such context
modification better than thread_control.

include/l4/api/exregs.h

@@ -11,9 +11,8 @@
 #include INC_GLUE(context.h)
 #include <l4/types.h>
 
-enum exregs_flags {
-	EXREGS_SET_PAGER = 1,
-};
+#define EXREGS_SET_PAGER		1
+#define	EXREGS_SET_UTCB			2
 
 /* Structure passed by userspace pagers for exchanging registers */
 struct exregs_data {
@@ -21,6 +20,8 @@ struct exregs_data {
 	u32 valid_vect;
 	u32 flags;
 	l4id_t pagerid;
+	unsigned long utcb_phys;
+	unsigned long utcb_virt;
 };
 
 

include/l4/api/kip.h

@@ -68,6 +68,8 @@ struct kip {
 	u32 arch_syscall2;
 	u32 arch_syscall3;
 
+	u32 utcb;
+
 	struct kernel_desc kdesc;
 } __attribute__((__packed__));
 

include/l4/api/thread.h

@@ -1,7 +1,7 @@
 #ifndef __THREAD_H__
 #define __THREAD_H__
 
-#define THREAD_CREATE_MASK		0x00F0
+#define THREAD_CREATE_MASK		0x0030
 
 /* Create new thread and new space */
 #define THREAD_NEW_SPACE		0x0010
@@ -12,7 +12,11 @@
 /* Create new thread, use given space */
 #define THREAD_SAME_SPACE		0x0030
 
-
+/* Shared UTCB, New UTCB, No UTCB */
+#define THREAD_UTCB_MASK		0x00C0
+#define THREAD_UTCB_NEW			0x0040
+#define THREAD_UTCB_SAME		0x0080
+#define THREAD_UTCB_NONE		0x00C0
 
 
 #define THREAD_ACTION_MASK		0x000F