smp.h

xen 3.2.2 源码

#ifndef __LINUX_SMP_H
#define __LINUX_SMP_H

/*
 *	Generic SMP support
 *		Alan Cox. <[e-mail]>
 */

#include <xen/config.h>

#ifdef CONFIG_SMP

#include <asm/smp.h>

/*
 * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc.
 * (defined in asm header):
 */ 

/*
 * stops all CPUs but the current one:
 */
extern void smp_send_stop(void);

extern void smp_send_event_check_mask(cpumask_t mask);
#define smp_send_event_check_cpu(cpu) \
    smp_send_event_check_mask(cpumask_of_cpu(cpu))

/*
 * Prepare machine for booting other CPUs.
 */
extern void smp_prepare_cpus(unsigned int max_cpus);

/*
 * Bring a CPU up
 */
extern int __cpu_up(unsigned int cpunum);

/*
 * Final polishing of CPUs
 */
extern void smp_cpus_done(unsigned int max_cpus);

/*
 * Call a function on all other processors
 */
extern int smp_call_function(
    void (*func) (void *info),
    void *info,
    int retry,
    int wait);

/* 
 * Call a function on a selection of processors
 */
extern int on_selected_cpus(
    cpumask_t selected,
    void (*func) (void *info),
    void *info,
    int retry,
    int wait);

/*
 * Mark the boot cpu "online" so that it can call console drivers in
 * printk() and can access its per-cpu storage.
 */
void smp_prepare_boot_cpu(void);

#else

/*
 *	These macros fold the SMP functionality into a single CPU system
 */

#define smp_send_event_check_mask(m)            ((void)0)
#define smp_send_event_check_cpu(p)             ((void)0) 
#define raw_smp_processor_id()			0
#define hard_smp_processor_id()			0
#define smp_call_function(func,info,retry,wait)	({ do {} while (0); 0; })
#define num_booting_cpus()			1
#define smp_prepare_boot_cpu()			do {} while (0)

static inline int on_selected_cpus(
    cpumask_t selected,
    void (*func) (void *info),
    void *info,
    int retry,
    int wait)
{
    if ( cpu_isset(0, selected) )
    {
        local_irq_disable();
        func(info);
        local_irq_enable();
    }
    return 0;
}

#endif

/*
 * Call a function on all processors
 */
static inline int on_each_cpu(
    void (*func) (void *info),
    void *info,
    int retry,
    int wait)
{
    return on_selected_cpus(cpu_online_map, func, info, retry, wait);
}

#define smp_processor_id() raw_smp_processor_id()

#endif