TODO

   1 short term:
   2 ----------
   3 - physical memory cache (reduce qemu-fast address space size to about 32 MB)
   4 - better code fetch
   5 - XP security bug
   6 - handle Self Modifying Code even if modifying current TB (BE OS 5 install)
   7 - cycle counter for all archs
   8 - TLB code protection support for PPC
   9 - add sysenter/sysexit and fxsr for L4 pistachio 686
  10 - basic VGA optimizations
  11 - disable SMC handling for ARM/SPARC/PPC
  12 - see undefined flags for BTx insn
  13 - user/kernel PUSHL/POPL in helper.c
  14 - keyboard output buffer filling timing emulation
  15 - return UD exception if LOCK prefix incorrectly used
  16 - cmos clock update and timers
  17 - test ldt limit < 7 ?
  18 - tests for each target CPU
  19 - fix CCOP optimisation
  20 - fix all remaining thread lock issues (must put TBs in a specific invalid
  21   state, find a solution for tb_flush()).
  22 - fix arm fpu rounding (at least for float->integer conversions)
  23 - SMP support
  24
  25 lower priority:
  26 --------------
  27 - suppress shift_mem ops
  28 - fix some 16 bit sp push/pop overflow (pusha/popa, lcall lret)
  29 - sysenter/sysexit emulation
  30 - optimize FPU operations (evaluate x87 stack pointer statically)
  31 - add IPC syscalls
  32 - use -msoft-float on ARM
  33 - use kernel traps for unaligned accesses on ARM ?
  34 - handle rare page fault cases (in particular if page fault in heplers or
  35   in syscall emulation code).
  36 - fix thread stack freeing (use kernel 2.5.x CLONE_CHILD_CLEARTID)
  37 - more syscalls (in particular all 64 bit ones, IPCs, fix 64 bit
  38   issues, fix 16 bit uid issues)
  39 - use page_unprotect_range in every suitable syscall to handle all
  40   cases of self modifying code.
  41 - use gcc as a backend to generate better code (easy to do by using
  42   op-i386.c operations as local inline functions).
  43 - add SSE2/MMX operations