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)          __cpu_local_vars[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)          __cpu_local_vars.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  * The global cpu local variables in use
  36  */
  37 extern struct __cpu_local_vars {
  38
  39 /* Process scheduling information and the kernel reentry count. */
  40         struct proc *proc_ptr;/* pointer to currently running process */
  41         struct proc *bill_ptr;/* process to bill for clock ticks */
  42         struct proc idle_proc;/* stub for an idle process */
  43
  44 /*
  45  * signal whether pagefault is already being handled to detect recursive
  46  * pagefaults
  47  */
  48         int pagefault_handled;
  49
  50 /*
  51  * which processpage tables are loaded right now. We need to know this because
  52  * some processes are loaded in each process pagetables and don't have their own
  53  * pagetables. Therefore we cannot use the proc_ptr pointer
  54  */
  55         struct proc * ptproc;
  56
  57 /* CPU private run queues */
  58         struct proc * run_q_head[NR_SCHED_QUEUES]; /* ptrs to ready list headers */
  59         struct proc * run_q_tail[NR_SCHED_QUEUES]; /* ptrs to ready list tails */
  60         int cpu_is_idle; /* let the others know that you are idle */
  61
  62         int idle_interrupted; /* to interrupt busy-idle
  63                                                      while profiling */
  64
  65         u64_t tsc_ctr_switch; /* when did we switched time accounting */
  66
  67 /* last values read from cpu when sending ooq msg to scheduler */
  68         u64_t cpu_last_tsc;
  69         u64_t cpu_last_idle;
  70
  71
  72         char fpu_presence; /* whether the cpu has FPU or not */
  73         struct proc * fpu_owner; /* who owns the FPU of the local cpu */
  74
  75 } __cpu_local_vars CPULOCAL_ARRAY;
  76
  77 #endif /* __ASSEMBLY__ */
  78
  79 #endif /* __CPULOCALS_H__ */