include/asm-x86/smp_64.h

   1 #ifndef __ASM_SMP_H
   2 #define __ASM_SMP_H
   3
   4 extern cpumask_t cpu_initialized;
   5 extern cpumask_t cpu_callin_map;
   6
   7 extern int smp_call_function_mask(cpumask_t mask, void (*func)(void *),
   8                                   void *info, int wait);
   9
  10 #ifdef CONFIG_SMP
  11
  12 #define raw_smp_processor_id()  read_pda(cpunumber)
  13
  14 #define stack_smp_processor_id()                                        \
  15 ({                                                                      \
  16         struct thread_info *ti;                                         \
  17         asm("andq %%rsp,%0; ":"=r" (ti) : "0" (CURRENT_MASK));  \
  18         ti->cpu;                                                        \
  19 })
  20
  21 /*
  22  * On x86 all CPUs are mapped 1:1 to the APIC space. This simplifies
  23  * scheduling and IPI sending and compresses data structures.
  24  */
  25 static inline int num_booting_cpus(void)
  26 {
  27         return cpus_weight(cpu_callout_map);
  28 }
  29
  30 #define safe_smp_processor_id()         smp_processor_id()
  31 #else /* CONFIG_SMP */
  32 #define stack_smp_processor_id() 0
  33 #define safe_smp_processor_id() 0
  34 #endif /* !CONFIG_SMP */
  35
  36
  37 #endif
  38