Remove signal-source headers from public API

Those headers implement a platform-specific mechanism. They are never
used by components directly.

This patch also cleans up a few other remaining platform-specific
artifact such as the Fiasco.OC-specific assert.h.

Issue #1993

repos/base-nova/src/include/signal_source/client.h

@@ -0,0 +1,102 @@
+/*
+ * \brief  NOVA-specific signal-source client interface
+ * \author Norman Feske
+ * \date   2010-02-03
+ *
+ * On NOVA, the signal source server does not provide a blocking
+ * 'wait_for_signal' function because this kernel does no support
+ * out-of-order IPC replies. Instead, we use a shared semaphore
+ * to let the client block until a signal is present at the
+ * server. The shared semaphore gets initialized with the first
+ * call of 'wait_for_signal()'.
+ */
+
+/*
+ * Copyright (C) 2010-2013 Genode Labs GmbH
+ *
+ * This file is part of the Genode OS framework, which is distributed
+ * under the terms of the GNU General Public License version 2.
+ */
+
+#ifndef _INCLUDE__SIGNAL_SOURCE__CLIENT_H_
+#define _INCLUDE__SIGNAL_SOURCE__CLIENT_H_
+
+/* Genode includes */
+#include <base/rpc_client.h>
+#include <signal_source/nova_signal_source.h>
+
+/* base-internal includes */
+#include <base/internal/native_thread.h>
+
+/* NOVA includes */
+#include <nova/syscalls.h>
+#include <nova/util.h>
+#include <nova/capability_space.h>
+
+namespace Genode {
+
+	class Signal_source_client : public Rpc_client<Nova_signal_source>
+	{
+		private:
+
+			/**
+			 * Capability referring to a NOVA semaphore
+			 */
+			Native_capability _sem;
+
+		public:
+
+			/**
+			 * Constructor
+			 */
+			Signal_source_client(Capability<Signal_source> cap)
+			: Rpc_client<Nova_signal_source>(static_cap_cast<Nova_signal_source>(cap))
+			{
+				/* request mapping of semaphore capability selector */
+				Thread * myself = Thread::myself();
+				request_signal_sm_cap(Capability_space::import(myself->native_thread().ec_sel + 1),
+				                      myself->native_thread().exc_pt_sel + Nova::PT_SEL_STARTUP);
+				_sem = Capability_space::import(myself->native_thread().exc_pt_sel + Nova::PT_SEL_STARTUP);
+				call<Rpc_register_semaphore>(_sem);
+			}
+
+			~Signal_source_client()
+			{
+				Nova::revoke(Nova::Obj_crd(_sem.local_name(), 0));
+			}
+
+
+			/*****************************
+			 ** Signal source interface **
+			 *****************************/
+
+			Signal wait_for_signal() override
+			{
+				using namespace Nova;
+
+				mword_t imprint, count;
+				do {
+
+					/*
+					 * We set an invalid imprint (0) to detect a spurious
+					 * unblock. In this case, NOVA does not block
+					 * SEMAPHORE_DOWN nor touch our input values if the
+					 * deblocking (chained) semaphore was dequeued before we
+					 * intend to block.
+					 */
+					imprint = 0;
+					count   = 0;
+
+					/* block on semaphore until signal context was submitted */
+					if (uint8_t res = si_ctrl(_sem.local_name(), SEMAPHORE_DOWN,
+					                  imprint, count))
+						PWRN("signal reception failed - error %u", res);
+
+				} while (imprint == 0);
+
+				return Signal(imprint, count);
+			}
+	};
+}
+
+#endif /* _INCLUDE__SIGNAL_SOURCE__CLIENT_H_ */

repos/base-nova/src/include/signal_source/nova_signal_source.h

@@ -0,0 +1,30 @@
+/*
+ * \brief  NOVA-specific signal source RPC interface
+ * \author Norman Feske
+ * \date   2011-04-12
+ */
+
+/*
+ * Copyright (C) 2011-2013 Genode Labs GmbH
+ *
+ * This file is part of the Genode OS framework, which is distributed
+ * under the terms of the GNU General Public License version 2.
+ */
+
+#ifndef _INCLUDE__SIGNAL_SOURCE__NOVA_SIGNAL_SOURCE_H_
+#define _INCLUDE__SIGNAL_SOURCE__NOVA_SIGNAL_SOURCE_H_
+
+#include <base/rpc.h>
+#include <signal_source/signal_source.h>
+
+namespace Genode { struct Nova_signal_source; }
+
+struct Genode::Nova_signal_source : Signal_source
+{
+	GENODE_RPC(Rpc_register_semaphore, void, register_semaphore,
+	           Native_capability const &);
+
+	GENODE_RPC_INTERFACE_INHERIT(Signal_source, Rpc_register_semaphore);
+};
+
+#endif /* _INCLUDE__SIGNAL_SOURCE__NOVA_SIGNAL_SOURCE_H_ */