Clean up base-library structure

This patch moves the base library from src/base to src/lib/base,
flattens the library-internal directory structure, and moves the common
parts of the library-description files to base/lib/mk/base.inc and
base/lib/mk/base-common.inc.

Furthermore, the patch fixes a few cosmetic issues (whitespace and
comments only) that I encountered while browsing the result.

Fixes #1952

repos/base-nova/src/lib/base/stack.cc

@@ -0,0 +1,127 @@
+/*
+ * \brief  Stack-specific part of the thread library
+ * \author Norman Feske
+ * \author Alexander Boettcher
+ * \author Martin Stein
+ * \date   2010-01-19
+ *
+ * This part of the thread library is required by the IPC framework
+ * also if no threads are used.
+ */
+
+/*
+ * 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.
+ */
+
+/* Genode includes */
+#include <util/construct_at.h>
+#include <base/env.h>
+#include <base/thread.h>
+
+/* base-internal includes */
+#include <base/internal/stack.h>
+#include <base/internal/stack_area.h>
+#include <base/internal/native_utcb.h>
+
+/* base-nova includes */
+#include <base/cap_map.h>
+
+using namespace Genode;
+
+extern addr_t __initial_sp;
+
+
+/*******************
+ ** local helpers **
+ *******************/
+
+Native_utcb * main_thread_utcb()
+{
+	using namespace Genode;
+	return reinterpret_cast<Native_utcb *>(
+	       stack_area_virtual_base() + stack_virtual_size() - Nova::PAGE_SIZE_BYTE);
+}
+
+
+addr_t main_thread_running_semaphore() { return Nova::SM_SEL_EC; }
+
+
+class Initial_cap_range : public Cap_range
+{
+	private:
+
+		enum { CAP_RANGE_START = 4096 };
+
+	public:
+
+		Initial_cap_range() : Cap_range(CAP_RANGE_START) { }
+};
+
+
+Initial_cap_range * initial_cap_range()
+{
+	static Initial_cap_range s;
+	return &s;
+}
+
+
+/*****************************
+ ** Startup library support **
+ *****************************/
+
+void prepare_init_main_thread()
+{
+	using namespace Genode;
+
+	cap_map()->insert(initial_cap_range());
+
+	/* for Core we can't perform the following code so early */
+	if (!__initial_sp) {
+
+		enum { CAP_RANGES = 32 };
+
+		unsigned index = initial_cap_range()->base() +
+		                 initial_cap_range()->elements();
+
+		static char local[CAP_RANGES][sizeof(Cap_range)];
+
+		for (unsigned i = 0; i < CAP_RANGES; i++) {
+
+			Cap_range * range = reinterpret_cast<Cap_range *>(local[i]);
+			*range = Cap_range(index);
+
+			cap_map()->insert(range);
+
+			index = range->base() + range->elements();
+		}
+	}
+}
+
+void prepare_reinit_main_thread()
+{
+	using namespace Genode;
+	construct_at<Capability_map>(cap_map());
+	construct_at<Initial_cap_range>(initial_cap_range());
+	prepare_init_main_thread();
+}
+
+
+/*****************
+ ** Thread_base **
+ *****************/
+
+Native_utcb *Thread_base::utcb()
+{
+	/*
+	 * If 'utcb' is called on the object returned by 'myself',
+	 * the 'this' pointer may be NULL (if the calling thread is
+	 * the main thread). Therefore we allow this special case
+	 * here.
+	 */
+	if (this == 0) return main_thread_utcb();
+
+	return &_stack->utcb();
+}