Minor changes in README. Added fault debugging printfs that can be turned on/off.

Tasks boot fine up to doing ipc using their utcbs.

UTCB PLAN:

- Push ipc registers into private environment instead of a shared utcb,
  but map-in a shared utcb to pass on long data to server tasks.
- Shared utcb has unique virtual address for every thread.
- Forked child does inherit parent's utcb, but cannot use it to communicate to
  any server. It must explicitly obtain its own utcb for that.
- Clone could have a flag to explicitly not inherit parent utcb, which is the
  right thing to do.
- MM0 serves a syscall to obtain self utcb.
- By this method, upon forks tasks don't need to map-in a utcb unless they want
  to pass long data.

tasks/mm0/src/arch-arm/mm.c

@@ -3,6 +3,7 @@
  */
 #include <arch/mm.h>
 #include <task.h>
+#include <vm_area.h>
 
 /* Extracts generic protection flags from architecture-specific pte */
 unsigned int vm_prot_flags(pte_t pte)
@@ -24,6 +25,18 @@ unsigned int vm_prot_flags(pte_t pte)
 	return vm_prot_flags;
 }
 
+#if defined(DEBUG_FAULT_HANDLING)
+void print_fault_params(struct fault_data *fault)
+{
+	printf("%s: Handling %s fault (%s abort) from %d. fault @ 0x%x\n",
+	       __TASKNAME__, (fault->reason & VM_READ) ? "read" : "write",
+	       is_prefetch_abort(fault->kdata->fsr) ? "prefetch" : "data",
+	       fault->task->tid, fault->address);
+}
+#else
+void print_fault_params(struct fault_data *fault) { }
+#endif
+
 
 /*
  * PTE STATES:
@@ -52,9 +65,6 @@ void set_generic_fault_params(struct fault_data *fault)
 		else
 			BUG();
 	}
-	printf("%s: Handling %s fault (%s abort) from %d. fault @ 0x%x\n",
-	       __TASKNAME__, (fault->reason & VM_READ) ? "read" : "write",
-	       is_prefetch_abort(fault->kdata->fsr) ? "prefetch" : "data",
-	       fault->task->tid, fault->address);
+	print_fault_params(fault);
 }