debug: boot stage markers

src/arch/x86_shared/start.rs

@@ -117,11 +117,14 @@ unsafe extern "C" fn start(args_ptr: *const KernelArgs, stack_end: usize) -> ! {
             }
 
             numa::init(&mut bump_allocator);
+            info!("NUMA init done, calling init_mm");
 
             crate::memory::init_mm(bump_allocator);
+            info!("init_mm done");
 
             #[cfg(target_arch = "x86_64")]
             crate::arch::alternative::early_init(true);
+            info!("alternatives done");
 
             // Set up syscall instruction
             interrupt::syscall::init();