include/asm-x86/smp_32.h

   1 #ifndef __ASM_SMP_H
   2 #define __ASM_SMP_H
   3
   4 #ifndef __ASSEMBLY__
   5
   6 extern cpumask_t cpu_callin_map;
   7
   8 extern void (*mtrr_hook)(void);
   9 extern void zap_low_mappings(void);
  10
  11 #ifdef CONFIG_SMP
  12 /*
  13  * This function is needed by all SMP systems. It must _always_ be valid
  14  * from the initial startup. We map APIC_BASE very early in page_setup(),
  15  * so this is correct in the x86 case.
  16  */
  17 DECLARE_PER_CPU(int, cpu_number);
  18 #define raw_smp_processor_id() (x86_read_percpu(cpu_number))
  19
  20 extern int safe_smp_processor_id(void);
  21
  22 /* We don't mark CPUs online until __cpu_up(), so we need another measure */
  23 static inline int num_booting_cpus(void)
  24 {
  25         return cpus_weight(cpu_callout_map);
  26 }
  27
  28 #else /* CONFIG_SMP */
  29 #define safe_smp_processor_id()         0
  30 #endif /* !CONFIG_SMP */
  31
  32 #endif /* !ASSEMBLY */
  33 #endif