os: component to reflect ROMs as reports

repos/os/recipes/src/rom_reporter/content.mk

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+SRC_DIR = src/app/rom_reporter
+include $(GENODE_DIR)/repos/base/recipes/src/content.inc

repos/os/recipes/src/rom_reporter/hash

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+2017-12-14 1e971aea4f50d3e4bca43b3c3da0fe41a578140e

repos/os/recipes/src/rom_reporter/used_apis

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+base
+os
+report_session

repos/os/src/app/rom_reporter/README

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+The ROM-reporter component requests a ROM session and reports the content of
+the ROM dataspace to a report session with the same label as the ROM session.
+
+The requested ROM modules must be specified via '<rom>' nodes within the
+component's '<config>' node. For example:
+
+! <config>
+!   <rom label="pci_devices/>
+! </config>
+

repos/os/src/app/rom_reporter/main.cc

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+/*
+ * \brief  Reflect content of ROM module as a report
+ * \author Norman Feske
+ * \date   2017-12-15
+ */
+
+/*
+ * 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.
+ */
+
+/* Genode includes */
+#include <base/component.h>
+#include <base/attached_rom_dataspace.h>
+#include <base/heap.h>
+#include <os/reporter.h>
+
+namespace Rom_reporter {
+	using namespace Genode;
+	struct Rom_module;
+	struct Main;
+}
+
+
+struct Rom_reporter::Rom_module
+{
+	Env &_env;
+
+	typedef String<160> Label;
+	Label const _label;
+
+	Attached_rom_dataspace _rom_ds { _env, _label.string() };
+
+	size_t _report_size = 0;
+
+	Constructible<Reporter> _reporter { };
+
+	Signal_handler<Rom_module> _rom_update_handler {
+		_env.ep(), *this, &Rom_module::_handle_rom_update };
+
+	void _handle_rom_update()
+	{
+		_rom_ds.update();
+
+		Xml_node const xml = _rom_ds.xml();
+
+		size_t const content_size = xml.size();
+
+		if (!_reporter.constructed() || (content_size > _report_size)) {
+			_reporter.construct(_env, "", _label.string(), content_size);
+			_reporter->enabled(true);
+		}
+
+		_reporter->report(xml.addr(), content_size);
+	}
+
+	Rom_module(Env &env, Label const &label) : _env(env), _label(label)
+	{
+		_rom_ds.sigh(_rom_update_handler);
+		_handle_rom_update();
+	}
+};
+
+
+struct Rom_reporter::Main
+{
+	Env &_env;
+
+	Attached_rom_dataspace _config { _env, "config" };
+
+	Heap _heap { _env.ram(), _env.rm() };
+
+	Main(Genode::Env &env) : _env(env)
+	{
+		_config.xml().for_each_sub_node("rom", [&] (Xml_node const &rom) {
+			new (_heap)
+				Rom_module(_env, rom.attribute_value("label",
+				                                     Rom_module::Label()));
+		});
+	}
+};
+
+
+void Component::construct(Genode::Env &env) { static Rom_reporter::Main main(env); }

repos/os/src/app/rom_reporter/target.mk

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+TARGET = rom_reporter
+SRC_CC = main.cc
+LIBS   = base