arch/x86/include/mach-xen/asm/smp-processor-id.h

   1 #ifndef _ASM_X86_SMP_PROCESSOR_ID_H
   2 #define _ASM_X86_SMP_PROCESSOR_ID_H
   3
   4 #if defined(CONFIG_SMP) && !defined(__ASSEMBLY__)
   5
   6 #include <asm/percpu.h>
   7
   8 DECLARE_PER_CPU(int, cpu_number);
   9
  10 /*
  11  * This function is needed by all SMP systems. It must _always_ be valid
  12  * from the initial startup. We map APIC_BASE very early in page_setup(),
  13  * so this is correct in the x86 case.
  14  */
  15 #define raw_smp_processor_id() percpu_read(cpu_number)
  16 #define safe_smp_processor_id() smp_processor_id()
  17
  18 #ifdef CONFIG_X86_64_SMP
  19 #define stack_smp_processor_id()                                        \
  20 ({                                                                      \
  21         struct thread_info *ti;                                         \
  22         __asm__("andq %%rsp,%0; ":"=r" (ti) : "0" (CURRENT_MASK));      \
  23         ti->cpu;                                                        \
  24 })
  25 #endif
  26
  27 #ifdef CONFIG_DEBUG_PREEMPT
  28 extern unsigned int debug_smp_processor_id(void);
  29 # define smp_processor_id() debug_smp_processor_id()
  30 #else
  31 # define smp_processor_id() raw_smp_processor_id()
  32 #endif
  33
  34 #endif /* SMP && !__ASSEMBLY__ */
  35
  36 #endif /* _ASM_X86_SMP_PROCESSOR_ID_H */