romfs/ams.mitm/pm: refactor to dynamically steal heap for certain games. (#2122)

* fs.mitm: skeleton the use of special allocation in romfs build

* pm: add api for ams.mitm to steal application memory

* pm/mitm: okay, that api won't work, try a different one

* romfs: revert memory usage increases; we'll handle torture games case-by-case.

* pm/romfs: first (broken?) pass at dynamic heap.

I cannot wait to figure out all the ways this is wrong.

* Release the dynamic heap a little more eagerly

* romfs: animal crossing is also not a nice game

* romfs: fix issues in close-during-build

* romfs: zelda is a blight upon this earth

stratosphere/ams_mitm/source/mitm_pm/mitm_pm_module.cpp

@@ -0,0 +1,45 @@
+/*
+ * Copyright (c) Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <stratosphere.hpp>
+#include "../amsmitm_initialization.hpp"
+#include "mitm_pm_module.hpp"
+#include "mitm_pm_service.hpp"
+
+namespace ams::mitm::pm {
+
+    namespace {
+
+        constexpr sm::ServiceName PmServiceName = sm::ServiceName::Encode("mitm:pm");
+        constexpr size_t          PmMaxSessions = 1;
+
+        constexpr size_t MaxServers = 1;
+        constexpr size_t MaxSessions = PmMaxSessions;
+        using ServerOptions = sf::hipc::DefaultServerManagerOptions;
+        sf::hipc::ServerManager<MaxServers, ServerOptions, MaxSessions> g_server_manager;
+
+        constinit sf::UnmanagedServiceObject<mitm::pm::impl::IPmInterface, mitm::pm::PmService> g_pm_service_object;
+
+    }
+
+    void MitmModule::ThreadFunction(void *) {
+        /* Create bpc:ams. */
+        R_ABORT_UNLESS(g_server_manager.RegisterObjectForServer(g_pm_service_object.GetShared(), PmServiceName, PmMaxSessions));
+
+        /* Loop forever, servicing our services. */
+        g_server_manager.LoopProcess();
+    }
+
+}