[tma2] [Ongoing] Continue implementing modules for tma2. (#1388)

* cs: add stub sysmodule to host command shell server

* cs: implement logic for main (linker error paradise, for now)

* cs: implement more of the system module's skeleton

* htcs: update client type names for libnx pr merge

libraries/libstratosphere/source/scs/scs_tenv.cpp

@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) 2018-2020 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>
+
+namespace ams::scs {
+
+    namespace {
+
+        alignas(os::MemoryPageSize) constinit u8 g_tenv_heap_storage[48_KB];
+        constinit lmem::HeapHandle g_tenv_heap_handle = nullptr;
+        constinit os::SdkMutex g_mutex;
+
+        void InitializeExpHeap() {
+            std::scoped_lock lk(g_mutex);
+            g_tenv_heap_handle = lmem::CreateExpHeap(g_tenv_heap_storage, sizeof(g_tenv_heap_storage), lmem::CreateOption_None);
+        }
+
+        void *Allocate(size_t size) {
+            std::scoped_lock lk(g_mutex);
+            void *mem = lmem::AllocateFromExpHeap(g_tenv_heap_handle, size);
+            return mem;
+        }
+
+        void Deallocate(void *p, size_t size) {
+            std::scoped_lock lk(g_mutex);
+            lmem::FreeToExpHeap(g_tenv_heap_handle, p);
+        }
+
+    }
+
+    void InitializeTenvServiceManager() {
+        /* Initialize the tenv heap. */
+        InitializeExpHeap();
+
+        /* Initialize the tenv library. */
+        htc::tenv::Initialize(Allocate, Deallocate);
+    }
+
+}