core: generic ROM module initialization

For most base platforms (except linux and sel4), the initialization of
boot modules is the same. Thus, merge this default implementation in the
new unit base/src/core/platform_rom_modules.cc.

Ref #2490

repos/base/src/core/platform_rom_modules.cc

@@ -0,0 +1,32 @@
+/*
+ * \brief  Default implementation of the ROM modules initialization
+ * \author Martin Stein
+ * \date   2017-08-17
+ */
+
+/*
+ * Copyright (C) 2017 Genode Labs GmbH
+ *
+ * This file is part of the Genode OS framework, which is distributed
+ * under the terms of the GNU Affero General Public License version 3.
+ */
+
+/* core includes */
+#include <boot_modules.h>
+#include <platform.h>
+
+using namespace Genode;
+
+
+void Platform::_init_rom_modules()
+{
+	/* add boot modules to ROM FS */
+	Boot_modules_header *header = &_boot_modules_headers_begin;
+	for (; header < &_boot_modules_headers_end; header++) {
+
+		Rom_module *rom_module = new (core_mem_alloc())
+			Rom_module(_rom_module_phys(header->base), header->size,
+			           (const char*)header->name);
+		_rom_fs.insert(rom_module);
+	}
+}