First user process!

Putting it all together, we have a user process that successfully calls sys_exit() w/o crashing.

apps/app.asm

@@ -1,18 +1,4 @@
 section .text
 global _start
 _start:
-    mov eax, ecx
-    push rdx
-    mov eax, 1
-    mov edi, hello_world
-    mov esi, 14
     int 42h
-    nop
-
-section .rodata
-hello_world:
-    db 'Hello, world!', 0xa, 0
-
-section .bss
-array:
-    resb 10

kernel/src/main.cpp

@@ -51,7 +51,8 @@ Result<void> init()
     kinfoln("Used memory:     %s", to_dynamic_unit(MemoryManager::used()).release_value().chars());
     kinfoln("Reserved memory: %s", to_dynamic_unit(MemoryManager::reserved()).release_value().chars());
 
-    MMU::unmap(0x400000);
+    Thread::init();
+    Scheduler::init();
 
     TarStream::Entry entry;
     while (TRY(g_initrd.read_next_entry().try_set_value_with_specific_error(entry, 0)))
@@ -61,18 +62,10 @@ Result<void> init()
             kinfoln("Found file %s in initial ramdisk, of size %s", entry.name,
                     to_dynamic_unit(entry.size).release_value().chars());
 
-            if (!strcmp(entry.name, "bin/app"))
-            {
-                auto data = TRY(ELFLoader::load(entry, g_initrd));
-                data.segments.consume([](ELFSegment* segment) { delete segment; });
-                kinfoln("Loaded ELF with entry=%#.16lx", data.entry);
-            }
+            if (!strcmp(entry.name, "bin/app")) { TRY(Scheduler::new_userspace_thread(entry, g_initrd)); }
         }
     }
 
-    Thread::init();
-    Scheduler::init();
-
     TRY(Scheduler::new_kernel_thread(heap_thread));
     TRY(Scheduler::new_kernel_thread(reap_thread));