ealanos: Added new "Shell" service to control a habitat from a user-space component.

repos/ealanos/include/ealanos/shell/client.h

@@ -0,0 +1,27 @@
+#ifndef __EALANOS__INCLUDE__SHELL__CLIENT_H_
+#define __EALANOS__INCLUDE__SHELL__CLIENT_H_
+
+#include "base/capability.h"
+#include "base/ram_allocator.h"
+#include "region_map/region_map.h"
+#include <base/rpc_client.h>
+#include <ealanos/shell/session.h>
+
+namespace Ealan
+{
+	namespace Shell
+	{
+		using Capability = Genode::Capability<Ealan::Shell::Session>;
+		
+		struct Client : Genode::Rpc_client<Ealan::Shell::Session> {
+			explicit Client(Capability cap) : Genode::Rpc_client<Ealan::Shell::Session>(cap) { }
+
+			Genode::Ram_dataspace_capability connect() override { return call<Rpc_connect>(); }
+
+			void disconnect() override { call<Rpc_disconnect>(); }
+			void commit() override { call<Rpc_commit>(); }
+		};
+	} // namespace Shell
+}
+
+#endif

repos/ealanos/include/ealanos/shell/component.h

@@ -0,0 +1,43 @@
+#ifndef __EALANOS__INCLUDE__SHELL__COMPONENT_H_
+#define __EALANOS__INCLUDE__SHELL__COMPONENT_H_
+
+#include "base/capability.h"
+#include "base/entrypoint.h"
+#include "base/ram_allocator.h"
+#include "region_map/region_map.h"
+#include <base/rpc_server.h>
+#include <base/session_label.h>
+#include <root/component.h>
+#include <base/session_object.h>
+
+#include <ealanos/shell/session.h>
+
+namespace Ealan {
+	class Hoitaja;
+
+	namespace Shell {
+		class Session_component : public Genode::Session_object<Ealan::Shell::Session>
+		{
+			private:
+
+				Genode::Entrypoint &_ep;
+				Ealan::Hoitaja     &_hoitaja;
+
+			public:
+
+				template <typename... ARGS>
+				Session_component(Hoitaja &hoitaja, Genode::Entrypoint &ep,
+				                  Genode::Session::Resources const &res, ARGS &&...args)
+					: Genode::Session_object<Session>(ep, res, args...), _ep(ep), _hoitaja(hoitaja)
+				{
+				}
+
+				Genode::Ram_dataspace_capability connect() override;
+				void disconnect() override;
+
+				void commit() override;
+		};
+    }
+} // namespace Ealan
+
+#endif

repos/ealanos/include/ealanos/shell/connection.h

@@ -0,0 +1,33 @@
+#ifndef __EALANOS__INCLUDE__SHELL__CONNECTION_H_
+#define __EALANOS__INCLUDE__SHELL__CONNECTION_H_
+
+#include "base/affinity.h"
+#include "base/capability.h"
+#include "base/ram_allocator.h"
+#include "region_map/region_map.h"
+#include <base/connection.h>
+#include <base/env.h>
+
+#include <ealanos/shell/client.h>
+
+namespace Ealan
+{
+	namespace Shell
+	{
+		struct Connection : Genode::Connection<Session>, Client {
+				Connection(Genode::Env &env, Genode::Affinity affinity = Genode::Affinity(Genode::Affinity::Space(1,1), Genode::Affinity::Location(0,0)),
+				           Label const &label = Label())
+					: Genode::Connection<Session>(env, label, Genode::Ram_quota{RAM_QUOTA},
+				                                  affinity, Args("")), Client(cap())
+				{
+				}
+
+				Genode::Ram_dataspace_capability connect() override { return Client::connect(); }
+
+				void disconnect() override { Client::disconnect(); }
+				void commit() override { Client::commit(); }
+		
+		};
+	} // namespace Shell
+} // namespace Ealan
+#endif

repos/ealanos/include/ealanos/shell/session.h

@@ -0,0 +1,59 @@
+#ifndef __EALANOS__INCLUDE__SHELL__SESSION_H_
+#define __EALANOS__INCLUDE__SHELL__SESSION_H_
+
+#include "base/capability.h"
+#include "base/ram_allocator.h"
+#include "base/rpc.h"
+#include "dataspace/capability.h"
+#include "region_map/region_map.h"
+#include <base/rpc_args.h>
+#include <session/session.h>
+#include <base/env.h>
+
+namespace Ealan
+{
+	namespace Shell
+	{
+		struct Session : Genode::Session 
+        {
+			static const char *service_name() { return "Shell"; }
+
+			enum { CAP_QUOTA = 2, RAM_QUOTA = 1024 };
+
+			/**
+			 * @brief Connect to a shell session by supplying a region map
+			 * 
+			 * @param rm - region map used for mapping the habitat's config to the client's virtual address space
+			 * @return true - Mapping was successful
+			 * @return false - An invalid region map was supplied or the mapping failed (e.g. lack of quota or caps)
+			 */
+			virtual Genode::Ram_dataspace_capability connect() = 0;
+
+            /**
+             * @brief Disconnects a client's shell session 
+             * 
+             */
+			virtual void disconnect() = 0;
+
+			/**
+			 * @brief Commit a change to the habitat's configuration made by the client.
+			 * @details In order to let changes made in the habitat's configuration take effect, the
+			 * changes must be reported by using this method. This will cause Hoitaja to
+             * re-read its configuration and applying any changes, such as creating new cells, destroying cells etc.
+			 */
+			virtual void commit() = 0;
+
+			/*****************
+			 * RPC interface *
+			 *****************/
+
+			GENODE_RPC(Rpc_connect, Genode::Ram_dataspace_capability, connect);
+			GENODE_RPC(Rpc_disconnect, void, disconnect);
+			GENODE_RPC(Rpc_commit, void, commit);
+
+			GENODE_RPC_INTERFACE(Rpc_connect, Rpc_disconnect, Rpc_commit);
+		};
+	} // namespace Shell
+} // namespace Ealan
+
+#endif

repos/ealanos/src/hoitaja/main.cc

@@ -12,8 +12,14 @@
  */
 
 /* Genode includes */
+#include "base/capability.h"
+#include "base/ipc.h"
+#include "base/ram_allocator.h"
+#include "region_map/client.h"
+#include "region_map/region_map.h"
 #include <base/component.h>
 #include <base/attached_rom_dataspace.h>
+#include <base/attached_ram_dataspace.h>
 #include <sandbox/sandbox.h>
 #include <os/reporter.h>
 #include <base/log.h>
@@ -21,6 +27,10 @@
 #include <child.h>
 
 #include <ealanos/laucher/component.h>
+
+#include <ealanos/shell/component.h>
+
+#include <base/mutex.h>
 namespace Ealan {
 
 	using namespace Genode;
@@ -31,7 +41,10 @@ namespace Ealan {
 
 class Ealan::Hoitaja : Genode::Sandbox::State_handler, Genode::Sandbox::Local_service_base::Wakeup
 {
-	private: 
+	private:
+
+		friend class Ealan::Shell::Session_component;
+
 		Env &_env;
 
 		Genode::Sandbox _sandbox { _env, *this };
@@ -40,6 +53,7 @@ class Ealan::Hoitaja : Genode::Sandbox::State_handler, Genode::Sandbox::Local_se
 
 		Genode::Xml_node *_habitat_config{nullptr};
 
+		Genode::Ram_dataspace_capability _config_ds{};
 		char *_config_dataspace{nullptr};
 
 		void _handle_resource_avail() { }
@@ -49,21 +63,23 @@ class Ealan::Hoitaja : Genode::Sandbox::State_handler, Genode::Sandbox::Local_se
 
 		Constructible<Reporter> _reporter { };
 
-		Genode::Rpc_entrypoint _ep{&_env.pd(), 4096, "launcher_ep", Genode::Affinity::Location(0, 0, 1, 1)};
-
-		Genode::Entrypoint _launcher_ep{_env, 4*4096, "launcher", Genode::Affinity::Location()};
-
 		Genode::Sliced_heap _md_alloc{_env.ram(), _env.rm()};
 
 		Genode::Heap _heap{_env.ram(), _env.rm()};
 
+		Genode::Mutex _config_lock{};
+
 		using Launcher_service = Genode::Sandbox::Local_service<Ealan::Launcher_session_component>;
 		Launcher_service _launcher_service{_sandbox, *this};
 
+		using Shell_service = Genode::Sandbox::Local_service<Ealan::Shell::Session_component>;
+		Shell_service _shell_service{_sandbox, *this};
+		
 		size_t _report_buffer_size = 0;
 
 		void _handle_config()
 		{
+			_config_lock.acquire();
 			_config.update();
 
 			if (_habitat_config) {
@@ -71,7 +87,19 @@ class Ealan::Hoitaja : Genode::Sandbox::State_handler, Genode::Sandbox::Local_se
 				delete _config_dataspace;
 			}
 
-			_config_dataspace = static_cast<char*>(_heap.alloc(_config.size()*32));
+			_config_ds = _env.ram().alloc(32 * _config.size());
+
+			Genode::Region_map::Attr attr{};
+			attr.writeable = true;
+
+			_config_dataspace = _env.rm()
+			                        .attach(_config_ds, attr)
+			                        .convert<char *>(
+										[&](Genode::Region_map::Range r) {
+											return reinterpret_cast<char*>(r.start);
+										},
+										[&](Genode::Region_map::Attach_error) { return nullptr; });
+			//_config_dataspace = static_cast<char*>(_heap.alloc(_config.size()*32));
 			Genode::memcpy(_config_dataspace, _config.local_addr<char*>(), _config.size());
 			_habitat_config = new (_sandbox._heap) Genode::Xml_node(_config_dataspace);
 
@@ -96,6 +124,7 @@ class Ealan::Hoitaja : Genode::Sandbox::State_handler, Genode::Sandbox::Local_se
 				_reporter->enabled(reporter_enabled);
 
 			_sandbox.apply_config(config);
+			_config_lock.release();
 		}
 
 		Signal_handler<Hoitaja> _config_handler {
@@ -136,31 +165,41 @@ class Ealan::Hoitaja : Genode::Sandbox::State_handler, Genode::Sandbox::Local_se
 			do
 			{
 				try {
+					_config_lock.acquire();
 					Genode::log("Updating state of child ", child.name());
 					_habitat_config = _sandbox.update(child, _habitat_config);
 					Genode::log("Updated config length:", _habitat_config->content_size());
+					_config_lock.release();
 				}
 				catch (Genode::Quota_guard<Genode::Cap_quota>::Limit_exceeded)
 				{
 					Genode::log("Caps exceeded while handling child state");
+					_config_lock.release();
 					_env.parent().exit(1);
 				}
 				catch (Genode::Ipc_error)
 				{
 					Genode::error("Failed to update child state for <", child.name(), ">");
+					_config_lock.release();
 					repeat = true;
 				}
 			} while (repeat);
 		}
 
 		void wakeup_local_service() override {
-			_launcher_service.for_each_requested_session([&](Launcher_service::Request &req)
-														{ req.deliver_session(*new (_md_alloc) Ealan::Launcher_session_component(*this, _env.ep() , req.resources, "", req.diag)); });
+			_launcher_service.for_each_requested_session([&](Launcher_service::Request &req) {
+				req.deliver_session(*new (_md_alloc) Ealan::Launcher_session_component(
+					*this, _env.ep(), req.resources, "", req.diag));
+			});
+			_shell_service.for_each_requested_session([&](Shell_service::Request &req) {
+				req.deliver_session(*new (_md_alloc) Ealan::Shell::Session_component(*this, _env.ep(), req.resources, "", req.diag));
+			});
 		}
 
 		void add_cell_from_xml(const char *start_node){
 			char *dest = nullptr;
 
+			_config_lock.acquire();
 			_habitat_config->with_raw_content([&](char const *content, Genode::size_t)
 											  { dest = const_cast<char*>(content); });
 			dest += _habitat_config->content_size();
@@ -183,8 +222,27 @@ class Ealan::Hoitaja : Genode::Sandbox::State_handler, Genode::Sandbox::Local_se
 					repeat = true;
 				}
 			} while (repeat);
+			_config_lock.release();
 		}
 
+		void update_config()
+		{
+			_config_lock.acquire();
+			_sandbox._heap.free(_habitat_config, sizeof(Xml_node));
+			_habitat_config = new (_sandbox._heap) Xml_node(_config_dataspace);
+
+			bool repeat = false;
+			do {
+				try {
+					_sandbox.apply_config(*_habitat_config);
+				} catch (Genode::Ipc_error) {
+					Genode::warning("IPC error while applying new configuration.");
+					repeat = true;
+				}
+			} while (repeat);
+			_config_lock.release();
+		}
+		
 		Hoitaja(Env &env) : _env(env)
 		{
 			_config.sigh(_config_handler);
@@ -207,5 +265,26 @@ void Ealan::Launcher_session_component::launch(Genode::String<640> start_node)
 	_hoitaja.add_cell_from_xml(start_node.string());
 }
 
+/*******************************
+ * Shell server implementation *
+ *******************************/
+
+Genode::Ram_dataspace_capability
+	Ealan::Shell::Session_component::connect()
+{
+	return _hoitaja._config_ds;
+}
+
+void Ealan::Shell::Session_component::disconnect()
+{
+}
+
+void Ealan::Shell::Session_component::commit()
+{
+	_hoitaja.update_config();
+}
+
+
+
 void Component::construct(Genode::Env &env) { static Ealan::Hoitaja main(env); }