minix/kernel/cpulocals.h

   1 /* Implementation of CPU local variables generics */
   2 #ifndef __CPULOCALS_H__
   3 #define __CPULOCALS_H__
   4
   5 #ifndef __ASSEMBLY__
   6
   7 #ifdef CONFIG_SMP
   8
   9 /* SMP */
  10
  11 #define CPULOCAL_ARRAY  [CONFIG_MAX_CPUS]
  12
  13 #define get_cpu_var(cpu, name)          CPULOCAL_STRUCT[cpu].name
  14 #define get_cpu_var_ptr(cpu, name)      (&(get_cpu_var(cpu, name)))
  15 #define get_cpulocal_var(name)          get_cpu_var(cpuid, name)
  16 #define get_cpulocal_var_ptr(name)      get_cpu_var_ptr(cpuid, name)
  17
  18 /* FIXME - padd the structure so that items in the array do not share cacheline
  19  * with other cpus */
  20
  21 #else
  22
  23 /* single CPU */
  24
  25 #define CPULOCAL_ARRAY
  26
  27 #define get_cpulocal_var(name)          CPULOCAL_STRUCT.name
  28 #define get_cpulocal_var_ptr(name)      &(get_cpulocal_var(name))
  29 #define get_cpu_var(cpu, name)          get_cpulocal_var(name)
  30 #define get_cpu_var_ptr(cpu, name)      get_cpulocal_var_ptr(name)
  31
  32 #endif
  33
  34
  35
  36 #define DECLARE_CPULOCAL(type, name)    type name
  37
  38 #define CPULOCAL_STRUCT                 __cpu_local_vars
  39 #define ___CPULOCAL_START               struct CPULOCAL_STRUCT {
  40 #define ___CPULOCAL_END         } CPULOCAL_STRUCT CPULOCAL_ARRAY;
  41
  42 #define DECLARE_CPULOCAL_START          extern ___CPULOCAL_START
  43 #define DECLARE_CPULOCAL_END            ___CPULOCAL_END
  44
  45 #define DEFINE_CPULOCAL_VARS    struct CPULOCAL_STRUCT CPULOCAL_STRUCT CPULOCAL_ARRAY
  46
  47
  48 /*
  49  * The global cpu local variables in use
  50  */
  51 DECLARE_CPULOCAL_START
  52
  53 /* Process scheduling information and the kernel reentry count. */
  54 DECLARE_CPULOCAL(struct proc *,proc_ptr);/* pointer to currently running process */
  55 DECLARE_CPULOCAL(struct proc *,bill_ptr);/* process to bill for clock ticks */
  56 DECLARE_CPULOCAL(struct proc ,idle_proc);/* stub for an idle process */
  57
  58 /*
  59  * signal whether pagefault is already being handled to detect recursive
  60  * pagefaults
  61  */
  62 DECLARE_CPULOCAL(int, pagefault_handled);
  63
  64 /*
  65  * which processpage tables are loaded right now. We need to know this because
  66  * some processes are loaded in each process pagetables and don't have their own
  67  * pagetables. Therefore we cannot use the proc_ptr pointer
  68  */
  69 DECLARE_CPULOCAL(struct proc *, ptproc);
  70
  71 /* CPU private run queues */
  72 DECLARE_CPULOCAL(struct proc *, run_q_head[NR_SCHED_QUEUES]); /* ptrs to ready list headers */
  73 DECLARE_CPULOCAL(struct proc *, run_q_tail[NR_SCHED_QUEUES]); /* ptrs to ready list tails */
  74 DECLARE_CPULOCAL(volatile int, cpu_is_idle); /* let the others know that you are idle */
  75
  76 DECLARE_CPULOCAL(volatile int, idle_interrupted); /* to interrupt busy-idle
  77                                                      while profiling */
  78
  79 DECLARE_CPULOCAL(u64_t ,tsc_ctr_switch); /* when did we switched time accounting */
  80
  81 /* last values read from cpu when sending ooq msg to scheduler */
  82 DECLARE_CPULOCAL(u64_t, cpu_last_tsc);
  83 DECLARE_CPULOCAL(u64_t, cpu_last_idle);
  84
  85
  86 DECLARE_CPULOCAL(char ,fpu_presence); /* whether the cpu has FPU or not */
  87 DECLARE_CPULOCAL(struct proc * ,fpu_owner); /* who owns the FPU of the local cpu */
  88
  89 DECLARE_CPULOCAL_END
  90
  91 #endif /* __ASSEMBLY__ */
  92
  93 #endif /* __CPULOCALS_H__ */