kernel/fiasco/src/kern/fpu.cpp

   1 /*
   2  * Fiasco
   3  * Floating point unit code
   4  */
   5
   6 INTERFACE:
   7
   8 #include "initcalls.h"
   9 #include "per_cpu_data.h"
  10 #include "types.h"
  11
  12 class slab_cache_anon;
  13 class Context;
  14 class Fpu_state;
  15 struct Trap_state;
  16
  17
  18 class Fpu
  19 {
  20 public:
  21
  22   static Context *owner(unsigned cpu);
  23   static void set_owner(unsigned cpu, Context *owner);
  24   static bool is_owner(unsigned cpu, Context *owner);
  25
  26   // all the following methods are arch dependent
  27   static void init(unsigned cpu) FIASCO_INIT_CPU;
  28   static unsigned state_size();
  29   static unsigned state_align();
  30   static void init_state(Fpu_state *);
  31   static void restore_state(Fpu_state *);
  32   static void save_state(Fpu_state *);
  33   static void disable();
  34   static void enable();
  35
  36 private:
  37
  38   static Per_cpu<Context *>_owner;
  39 };
  40
  41 IMPLEMENTATION:
  42
  43 #include "fpu_state.h"
  44
  45 Per_cpu<Context *> DEFINE_PER_CPU Fpu::_owner;
  46
  47 IMPLEMENT inline
  48 Context * Fpu::owner(unsigned cpu)
  49 {
  50   return _owner.cpu(cpu);
  51 }
  52
  53 IMPLEMENT inline
  54 void Fpu::set_owner(unsigned cpu, Context *owner)
  55 {
  56   _owner.cpu(cpu) = owner;
  57 }
  58
  59 IMPLEMENT inline
  60 bool Fpu::is_owner(unsigned cpu, Context *owner)
  61 {
  62   return _owner.cpu(cpu) == owner;
  63 }
  64
  65 //---------------------------------------------------------------------------
  66 IMPLEMENTATION [!fpu]:
  67
  68 IMPLEMENT inline
  69 void Fpu::init_state(Fpu_state *)
  70 {}
  71
  72 IMPLEMENT inline
  73 unsigned Fpu::state_size()
  74 { return 0; }
  75
  76 IMPLEMENT inline
  77 unsigned Fpu::state_align()
  78 { return 0; }
  79
  80 IMPLEMENT
  81 void Fpu::init(unsigned)
  82 {}
  83
  84 IMPLEMENT inline
  85 void Fpu::save_state(Fpu_state *)
  86 {}
  87
  88 IMPLEMENT inline
  89 void Fpu::restore_state(Fpu_state *)
  90 {}
  91
  92 IMPLEMENT inline
  93 void Fpu::disable()
  94 {}
  95
  96 IMPLEMENT inline
  97 void Fpu::enable()
  98 {}