message: add exit code if the kernel runs on uhyve
diff: @@ -347,10 +347,16 @@ fn boot_processor_main() -> ! {
  #[cfg(target_arch = "aarch64")]
  {
  info!("The current hermit-kernel is only implemented up to this point on aarch64.");
  + if environment::is_uhyve() {
  + syscalls::init();
  + syscalls::__sys_shutdown(0);
  + } else {
  info!("Attempting to exit via QEMU.");
  info!("This requires that you passed the `-semihosting` option to QEMU.");
  let exit_handler = qemu_exit::AArch64::new();
  exit_handler.exit_success();
  + }
  +
  loop {} /* Compiles up to here - loop prevents linker errors */
  }
  arch::boot_processor_init();
  