genode/ports/src/app/gdb_monitor/rom.h

/*
 * \brief  ROM service
 * \author Christian Helmuth
 * \date   2011-09-16
 */

/*
 * 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 _ROM_H_
#define _ROM_H_

/* Genode includes */
#include <base/service.h>
#include <root/component.h>
#include <rom_session/client.h>
#include <util/arg_string.h>


namespace Gdb_monitor {

	using namespace Genode;

	/**
	 * Clone a ROM dataspace in RAM
	 */
	Capability<Ram_dataspace> clone_rom(Capability<Rom_dataspace> rom_cap)
	{
		Genode::size_t            rom_size  = Dataspace_client(rom_cap).size();
		Capability<Ram_dataspace> clone_cap = env()->ram_session()->alloc(rom_size);

		if (!clone_cap.valid()) {
			PERR("%s: memory allocation for cloned dataspace failed", __func__);
			return Capability<Ram_dataspace>();
		}

		void *rom   = env()->rm_session()->attach(rom_cap);
		void *clone = env()->rm_session()->attach(clone_cap);

		memcpy(clone, rom, rom_size);

		env()->rm_session()->detach(rom);
		env()->rm_session()->detach(clone);

		return clone_cap;
	}


	/**
	 * ROM session backed by RAM dataspace copy of original ROM
	 */
	class Rom_session_component : public Rpc_object<Rom_session>
	{
		private:

			Capability<Ram_dataspace> _clone_cap;

		public:

			Rom_session_component(char const *filename)
			: _clone_cap(clone_rom(Rom_connection(filename).dataspace()))
			{ }

			~Rom_session_component() { env()->ram_session()->free(_clone_cap); }

			Capability<Rom_dataspace> dataspace()
			{
				return static_cap_cast<Rom_dataspace>(
				       static_cap_cast<Dataspace>(_clone_cap));
			}

			void release() { }

			void sigh(Genode::Signal_context_capability) { }
	};


	class Rom_root : public Root_component<Rom_session_component>
	{
		protected:

			Rom_session_component *_create_session(char const *args)
			{
				enum { FILENAME_MAX_LEN = 128 };
				char filename[FILENAME_MAX_LEN];
				Arg_string::find_arg(args, "filename").string(filename, sizeof(filename), "");

				return new (md_alloc()) Rom_session_component(filename);
			}

		public:

			Rom_root(Rpc_entrypoint *session_ep,
			         Allocator      *md_alloc)
			: Root_component<Rom_session_component>(session_ep, md_alloc)
			{ }
	};


	class Rom_service : public Service
	{
		private:

			Rom_root _root;

		public:

			Rom_service(Rpc_entrypoint *entrypoint,
			            Allocator      *md_alloc)
			: Service("ROM"), _root(entrypoint, md_alloc)
			{ }

			Capability<Session> session(char const *args, Affinity const &affinity) {
				return _root.session(args, affinity); }

			void upgrade(Capability<Session>, char const *) { }

			void close(Capability<Session> cap) { _root.close(cap); }
	};
}

#endif /* _ROM_H_ */