From 682d26c673d686115be2cdd0257b193b19514d22 Mon Sep 17 00:00:00 2001
From: Michael Mueller <michael.mueller@uos.de>
Date: Mon, 27 Mar 2023 16:30:53 +0200
Subject: [PATCH] Added Genode::Env to MxTasking environment.

---
 src/mx/system/environment.h | 93 +++++++++++++++++++++++++++++++++----
 1 file changed, 83 insertions(+), 10 deletions(-)

diff --git a/src/mx/system/environment.h b/src/mx/system/environment.h
index f975a83..ce864ea 100644
--- a/src/mx/system/environment.h
+++ b/src/mx/system/environment.h
@@ -1,6 +1,10 @@
 #pragma once
-
-#include <fstream>
+#include <libc/component.h>
+#include <base/ram_allocator.h>
+#include <topo_session/topo_session.h>
+#include <base/affinity.h>
+#include <topo_session/node.h>
+#include <cstdint>
 
 namespace mx::system {
 /**
@@ -8,20 +12,89 @@ namespace mx::system {
  */
 class Environment
 {
+private:
+    /**
+     * @brief Pointer to application's environment
+     * @details The application's environment grants access to core services of EalánOS, such as thread creation and memory allocation.
+     */
+    Libc::Env *_env;
+
 public:
+    Environment() = default;
+
+    /**
+     * @brief Get Enviroment of current application
+     * 
+     * @return Libc::Env& environment
+     */
+    Libc::Env &getenv() { return *_env; }
+    
+    /**
+     * @brief Set libc environment for MxTasking 
+     * @details 
+     * @param env pointer to libc enviroment object
+     */
+    void setenv(Libc::Env *env) { _env = env; }
+
+    /**
+     * @brief Get the instance object
+     * 
+     * @return Environment& singleton object of Environment
+     */
+    static Environment &get_instance() 
+    {
+        static Environment env;
+        return env;
+    }
+    
+    /**
+    * @brief Quick access to libc environment
+    * 
+    * @return Libc::Env& 
+    */
+    static Libc::Env &env() { return Environment::get_instance().getenv(); }
+    
+    /**
+     * @brief Set the libc env object
+     * 
+     * @details This method **must** be called before creating the MxTasking runtime, because the environment
+     *          is vital for the initialization of the MxTasking runtime enviroment.
+     * @param env pointer to application's environment
+     */
+    static void set_env(Libc::Env *env) {
+        Environment::get_instance().setenv(env);
+    }
+
+    /*
+     * Access methods to core sessions of the libc enviroment, MxTasking is running in
+     */
+    static Genode::Cpu_session &cpu() { return Environment::env().cpu(); }
+    static Genode::Ram_allocator &ram() { return Environment::env().ram(); }
+    static Genode::Region_map &rm() { return Environment::env().rm(); }
+    static Genode::Topo_session &topo() { return Environment::env().topo(); }
+
+    /**
+     * @brief Convert integral core_id to location in the affinity space of the component
+     * 
+     * @param core_id The core_id to convert
+     * @return Genode::Affinity::Location const& corresponding location in affinity space
+     */
+    static Genode::Affinity::Location location(std::uint16_t core_id) { return cpu().affinity_space().location_of_index(core_id); }
+    
+    /**
+     * @brief Get NUMA node object for respective numa_id
+     * 
+     * @param numa_id of Node to return
+     * @return Topology::Numa_region const& the corresponding node object
+     */
+    static Topology::Numa_region node(std::uint8_t numa_id) { return topo().node_at_id(numa_id); }
+    
     /**
      * @return True, if NUMA balancing is enabled by the system.
      */
     static bool is_numa_balancing_enabled()
     {
-        std::ifstream numa_balancing_file("/proc/sys/kernel/numa_balancing");
-        auto is_enabled = std::int32_t{};
-        if (numa_balancing_file >> is_enabled)
-        {
-            return !(is_enabled == 0);
-        }
-
-        return true;
+        return false;
     }
 
     static constexpr auto is_sse2()