linux/include/asm-i386/smp.h

#ifndef __ASM_SMP_H
#define __ASM_SMP_H

/*
 * We need the APIC definitions automatically as part of 'smp.h'
 */
#ifndef __ASSEMBLY__
#include <linux/kernel.h>
#include <linux/threads.h>
#include <linux/cpumask.h>
#endif

#if defined(CONFIG_X86_LOCAL_APIC) && !defined(__ASSEMBLY__)
#include <asm/bitops.h>
#include <asm/mpspec.h>
#include <asm/apic.h>
#ifdef CONFIG_X86_IO_APIC
#include <asm/io_apic.h>
#endif
#endif

#define BAD_APICID 0xFFu
#ifdef CONFIG_SMP
#ifndef __ASSEMBLY__

/*
 * Private routines/data
 */
 
extern void smp_alloc_memory(void);
extern int pic_mode;
extern int smp_num_siblings;
extern cpumask_t cpu_sibling_map[];
extern cpumask_t cpu_core_map[];

extern void (*mtrr_hook) (void);
extern void zap_low_mappings (void);
extern void lock_ipi_call_lock(void);
extern void unlock_ipi_call_lock(void);

#define MAX_APICID 256
extern u8 x86_cpu_to_apicid[];

#define cpu_physical_id(cpu)	x86_cpu_to_apicid[cpu]

#ifdef CONFIG_HOTPLUG_CPU
extern void cpu_exit_clear(void);
extern void cpu_uninit(void);
#endif

struct smp_ops
{
	void (*smp_prepare_boot_cpu)(void);
	void (*smp_prepare_cpus)(unsigned max_cpus);
	int (*cpu_up)(unsigned cpu);
	void (*smp_cpus_done)(unsigned max_cpus);

	void (*smp_send_stop)(void);
	void (*smp_send_reschedule)(int cpu);
	int (*smp_call_function_mask)(cpumask_t mask,
				      void (*func)(void *info), void *info,
				      int wait);
};

extern struct smp_ops smp_ops;

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 int __cpu_up(unsigned int cpu)
{
	return smp_ops.cpu_up(cpu);
}
static inline void smp_cpus_done(unsigned int max_cpus)
{
	smp_ops.smp_cpus_done(max_cpus);
}

static inline void smp_send_stop(void)
{
	smp_ops.smp_send_stop();
}
static inline void smp_send_reschedule(int cpu)
{
	smp_ops.smp_send_reschedule(cpu);
}
static inline int smp_call_function_mask(cpumask_t mask,
					 void (*func) (void *info), void *info,
					 int wait)
{
	return smp_ops.smp_call_function_mask(mask, func, info, wait);
}

void native_smp_prepare_boot_cpu(void);
void native_smp_prepare_cpus(unsigned int max_cpus);
int native_cpu_up(unsigned int cpunum);
void native_smp_cpus_done(unsigned int max_cpus);

#ifndef CONFIG_PARAVIRT
#define startup_ipi_hook(phys_apicid, start_eip, start_esp) 		\
do { } while (0)
#endif

/*
 * 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.
 */
DECLARE_PER_CPU(int, cpu_number);
#define raw_smp_processor_id() (x86_read_percpu(cpu_number))

extern cpumask_t cpu_callout_map;
extern cpumask_t cpu_callin_map;
extern cpumask_t cpu_possible_map;

/* We don't mark CPUs online until __cpu_up(), so we need another measure */
static inline int num_booting_cpus(void)
{
	return cpus_weight(cpu_callout_map);
}

#ifdef CONFIG_X86_LOCAL_APIC

#ifdef APIC_DEFINITION
extern int hard_smp_processor_id(void);
#else
#include <mach_apicdef.h>
static inline int hard_smp_processor_id(void)
{
	/* we don't want to mark this access volatile - bad code generation */
	return GET_APIC_ID(*(unsigned long *)(APIC_BASE+APIC_ID));
}
#endif
#endif

extern int safe_smp_processor_id(void);
extern int __cpu_disable(void);
extern void __cpu_die(unsigned int cpu);
extern unsigned int num_processors;

#endif /* !__ASSEMBLY__ */

#else /* CONFIG_SMP */

#define safe_smp_processor_id()		0
#define cpu_physical_id(cpu)		boot_cpu_physical_apicid

#define NO_PROC_ID		0xFF		/* No processor magic marker */

#endif

#ifndef __ASSEMBLY__

extern u8 apicid_2_node[];

#ifdef CONFIG_X86_LOCAL_APIC
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(*(unsigned long *)(APIC_BASE+APIC_LDR));
}
#endif
#endif

#endif