text: #ifndef _ASM_X86_SMP_H
  #define _ASM_X86_SMP_H
  #ifndef __ASSEMBLY__
  #include <linux/cpumask.h>
  #include <asm/percpu.h>
  
  /*
   * We need the APIC definitions automatically as part of 'smp.h'
   */
  #ifdef CONFIG_X86_LOCAL_APIC
  # include <asm/mpspec.h>
  # include <asm/apic.h>
  # ifdef CONFIG_X86_IO_APIC
  #  include <asm/io_apic.h>
  # endif
  #endif
  #include <asm/thread_info.h>
  #include <asm/cpumask.h>
  
  extern int smp_num_siblings;
  extern unsigned int num_processors;
  
  DECLARE_PER_CPU_READ_MOSTLY(cpumask_var_t, cpu_sibling_map);
  DECLARE_PER_CPU_READ_MOSTLY(cpumask_var_t, cpu_core_map);
  /* cpus sharing the last level cache: */
  DECLARE_PER_CPU_READ_MOSTLY(cpumask_var_t, cpu_llc_shared_map);
  DECLARE_PER_CPU_READ_MOSTLY(u16, cpu_llc_id);
  DECLARE_PER_CPU_READ_MOSTLY(int, cpu_number);
  
  static inline struct cpumask *cpu_llc_shared_mask(int cpu)
  {
  	return per_cpu(cpu_llc_shared_map, cpu);
  }
  
  DECLARE_EARLY_PER_CPU_READ_MOSTLY(u16, x86_cpu_to_apicid);
  DECLARE_EARLY_PER_CPU_READ_MOSTLY(u16, x86_bios_cpu_apicid);
  #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86_32)
  DECLARE_EARLY_PER_CPU_READ_MOSTLY(int, x86_cpu_to_logical_apicid);
  #endif
  
  /* Static state in head.S used to set up a CPU */
  extern unsigned long stack_start; /* Initial stack pointer address */
  
  struct task_struct;
  
  struct smp_ops {
  	void (*smp_prepare_boot_cpu)(void);
  	void (*smp_prepare_cpus)(unsigned max_cpus);
  	void (*smp_cpus_done)(unsigned max_cpus);
  
  	void (*stop_other_cpus)(int wait);
  	void (*smp_send_reschedule)(int cpu);
  
  	int (*cpu_up)(unsigned cpu, struct task_struct *tidle);
  	int (*cpu_disable)(void);
  	void (*cpu_die)(unsigned int cpu);
  	void (*play_dead)(void);
  
  	void (*send_call_func_ipi)(const struct cpumask *mask);
  	void (*send_call_func_single_ipi)(int cpu);
  };
  
  /* Globals due to paravirt */
  extern void set_cpu_sibling_map(int cpu);
  
  #ifdef CONFIG_SMP
  extern struct smp_ops smp_ops;
  
  static inline void smp_send_stop(void)
  {
  	smp_ops.stop_other_cpus(0);
  }
  
  static inline void stop_other_cpus(void)
  {
  	smp_ops.stop_other_cpus(1);
  }
  
  static inline void smp_prepare_boot_cpu(void)
  {
  	smp_ops.smp_prepare_boot_cpu();
  }
  
  static inline void smp_prepare_cpus(unsigned int max_cpus)
  {
  	smp_ops.smp_prepare_cpus(max_cpus);
  }
  
  static inline void smp_cpus_done(unsigned int max_cpus)
  {
  	smp_ops.smp_cpus_done(max_cpus);
  }
  
  static inline int __cpu_up(unsigned int cpu, struct task_struct *tidle)
  {
  	return smp_ops.cpu_up(cpu, tidle);
  }
  
  static inline int __cpu_disable(void)
  {
  	return smp_ops.cpu_disable();
  }
  
  static inline void __cpu_die(unsigned int cpu)
  {
  	smp_ops.cpu_die(cpu);
  }
  
  static inline void play_dead(void)
  {
  	smp_ops.play_dead();
  }
  
  static inline void smp_send_reschedule(int cpu)
  {
  	smp_ops.smp_send_reschedule(cpu);
  }
  
  static inline void arch_send_call_function_single_ipi(int cpu)
  {
  	smp_ops.send_call_func_single_ipi(cpu);
  }
  
  static inline void arch_send_call_function_ipi_mask(const struct cpumask *mask)
  {
  	smp_ops.send_call_func_ipi(mask);
  }
  
  void cpu_disable_common(void);
  void native_smp_prepare_boot_cpu(void);
  void native_smp_prepare_cpus(unsigned int max_cpus);
  void native_smp_cpus_done(unsigned int max_cpus);
  void common_cpu_up(unsigned int cpunum, struct task_struct *tidle);
  int native_cpu_up(unsigned int cpunum, struct task_struct *tidle);
  int native_cpu_disable(void);
  int common_cpu_die(unsigned int cpu);
  void native_cpu_die(unsigned int cpu);
  void native_play_dead(void);
  void play_dead_common(void);
  void wbinvd_on_cpu(int cpu);
  int wbinvd_on_all_cpus(void);
  
  void native_send_call_func_ipi(const struct cpumask *mask);
  void native_send_call_func_single_ipi(int cpu);
  void x86_idle_thread_init(unsigned int cpu, struct task_struct *idle);
  
  void smp_store_boot_cpu_info(void);
  void smp_store_cpu_info(int id);
  #define cpu_physical_id(cpu)	per_cpu(x86_cpu_to_apicid, cpu)
  
  #else /* !CONFIG_SMP */
  #define wbinvd_on_cpu(cpu)     wbinvd()
  static inline int wbinvd_on_all_cpus(void)
  {
  	wbinvd();
  	return 0;
  }
  #define smp_num_siblings	1
  #endif /* CONFIG_SMP */
  
  extern unsigned disabled_cpus;
  
  #ifdef CONFIG_X86_32_SMP
  /*
   * This function is needed by all SMP systems. It must _always_ be valid
   * from the initial startup. We map APIC_BASE very early in page_setup(),
   * so this is correct in the x86 case.
   */
  #define raw_smp_processor_id() (this_cpu_read(cpu_number))
  extern int safe_smp_processor_id(void);
  
  #elif defined(CONFIG_X86_64_SMP)
  #define raw_smp_processor_id() (this_cpu_read(cpu_number))
  
  #define stack_smp_processor_id()					\
  ({								\
  	struct thread_info *ti;						\
  	__asm__("andq %%rsp,%0; ":"=r" (ti) : "0" (CURRENT_MASK));	\
  	ti->cpu;							\
  })
  #define safe_smp_processor_id()		smp_processor_id()
  
  #endif
  
  #ifdef CONFIG_X86_LOCAL_APIC
  
  #ifndef CONFIG_X86_64
  static inline int logical_smp_processor_id(void)
  {
  	/* we don't want to mark this access volatile - bad code generation */
  	return GET_APIC_LOGICAL_ID(apic_read(APIC_LDR));
  }
  
  #endif
  
  extern int hard_smp_processor_id(void);
  
  #else /* CONFIG_X86_LOCAL_APIC */
  
  # ifndef CONFIG_SMP
  #  define hard_smp_processor_id()	0
  # endif
  
  #endif /* CONFIG_X86_LOCAL_APIC */
  
  #ifdef CONFIG_DEBUG_NMI_SELFTEST
  extern void nmi_selftest(void);
  #else
  #define nmi_selftest() do { } while (0)
  #endif
  
  #endif /* __ASSEMBLY__ */
  #endif /* _ASM_X86_SMP_H */
  