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- PS/2 answers with ERROR if PS/2 mouse is not connected,
  read_ack should handle error cases correctly. We should
  also probe correctly for the mouse. (0xFE on all commands)
- bochs shows us distorted text console output, why?
- bootloader has trouble detecting drive geometry of hard disks,
  only the floppy mode works reliably at the moment (in emulators
  and on real machines). Especially USB-pens in floppy BIOS emulation
  seems to report wrong CHS values.
- GUI: sort out a readable and type-safe (as much as possible)
  modus operandi. Accesses via base member chains are type safe, but
  we have to know the depth of the hierarchy of a derived class. Casts
  on the other hand are shorter to read, but not type-safe.
- real hardware like the Asus EEEPC 701 cannot switch A20 correctly,
  no clue why?
- if a task ends, what should we do? currently we crash
- memorymanagement should be a library of the libc or even a standalone
  library, not part of the kernel directory, get rid of kernel_panic
  there (this requires the kernel_stub.c kernel_panic to exist in
  libc tests)
- clang and -O2/-O3 break test_printf.c and printf, va_arg macros
  break. inlining va_arg functions should be possible. -Wno-inline,
  attribute(used), attribute(noinline) have no effect (or not always,
  depends on the host platform?).
- should we unify the init interface of all drivers? Currently only
  the PCI ones are unified (for instance by having the event handler
  as a register_handler method and not part of the ctor).
  Arguments for splitting:
  - also the PS/2 devices are on a serio bus
  - there are ISA/AGP/I2C/USB buses which are also dynamic
  - we could have multiple registered handlers for some devices
- rtl8139 driver:
  - can only transmit one packet in parallel currently (transmitting
    boolean flag. Taken from Tyndur. No queueing currently and
    postponing of sending of packets)