sel4: startup lib reinit support

required for noux

Issue #2044

repos/base-sel4/src/lib/base/ipc.cc

@@ -60,6 +60,22 @@ static unsigned &rcv_sel()
 }
 
 
+/*****************************
+ ** Startup library support **
+ *****************************/
+
+void prepare_reinit_main_thread()
+{
+	/**
+	 * Reset selector to invalid, so that a new fresh will be allocated.
+	 * The IPC buffer of the thread must be configured to point to the
+	 * receive selector which is done by Capability_space::alloc_rcv_sel(),
+	 * which finally calls seL4_SetCapReceivePath();
+	 */
+	rcv_sel() = 0;
+}
+
+
 /**
  * Convert Genode::Msgbuf_base content into seL4 message
  *

repos/base-sel4/src/lib/base/thread_bootstrap.cc

@@ -25,8 +25,6 @@
 
 void prepare_init_main_thread() { }
 
-void prepare_reinit_main_thread() { prepare_init_main_thread(); }
-
 
 /************
  ** Thread **

repos/base-sel4/src/lib/base/thread_init.cc

@@ -13,12 +13,16 @@
 
 /* Genode includes */
 #include <base/thread.h>
-#include <base/printf.h>
-#include <base/sleep.h>
+#include <base/internal/native_thread.h>
 
 using namespace Genode;
 
 
 void Thread::_init_platform_thread(size_t, Type type)
 {
+	/**
+	 * Reset to default values. The default values trigger initial allocations
+	 * and associations the thread, like IPCbuffer in ipc.cc.
+	 */
+	native_thread() = Native_thread();
 }