FreeBSD/Linux Kernel Cross Reference
sys/sys/smp.h

     /*
      * ----------------------------------------------------------------------------
      * "THE BEER-WARE LICENSE" (Revision 42):
      * <phk@FreeBSD.org> wrote this file.  As long as you retain this notice you
      * can do whatever you want with this stuff. If we meet some day, and you think
      * this stuff is worth it, you can buy me a beer in return.   Poul-Henning Kamp
      * ----------------------------------------------------------------------------
      *
      * $FreeBSD: releng/5.0/sys/sys/smp.h 96999 2002-05-20 16:11:38Z jake $
     */
    
    #ifndef _SYS_SMP_H_
    #define _SYS_SMP_H_
    
    #ifdef _KERNEL
    
    #ifndef LOCORE
    
    #ifdef SMP
    extern void (*cpustop_restartfunc)(void);
    extern int mp_ncpus;
    extern int smp_active;
    extern volatile int smp_started;
    extern int smp_cpus;
    extern u_int all_cpus;
    extern volatile u_int started_cpus;
    extern volatile u_int stopped_cpus;
    extern u_int mp_maxid;
    
    /*
     * Macro allowing us to determine whether a CPU is absent at any given
     * time, thus permitting us to configure sparse maps of cpuid-dependent
     * (per-CPU) structures.
     */
    #define CPU_ABSENT(x_cpu)       ((all_cpus & (1 << (x_cpu))) == 0)
    
    /*
     * Machine dependent functions used to initialize MP support.
     *
     * The cpu_mp_probe() should check to see if MP support is present and return
     * zero if it is not or non-zero if it is.  If MP support is present, then
     * cpu_mp_start() will be called so that MP can be enabled.  This function
     * should do things such as startup secondary processors.  It should also
     * setup mp_ncpus, all_cpus, and smp_cpus.  It should also ensure that
     * smp_active and smp_started are initialized at the appropriate time.
     * Once cpu_mp_start() returns, machine independent MP startup code will be
     * executed and a simple message will be output to the console.  Finally,
     * cpu_mp_announce() will be called so that machine dependent messages about
     * the MP support may be output to the console if desired.
     */
    struct thread;
    
    void    cpu_mp_announce(void);
    int     cpu_mp_probe(void);
    void    cpu_mp_start(void);
    
    void    forward_signal(struct thread *);
    void    forward_roundrobin(void);
    int     restart_cpus(u_int);
    int     stop_cpus(u_int);
    void    smp_rendezvous_action(void);
    void    smp_rendezvous(void (*)(void *), 
                           void (*)(void *),
                           void (*)(void *),
                           void *arg);
    #else /* SMP */
    #define CPU_ABSENT(x_cpu)       (0)
    #endif /* SMP */
    #endif /* !LOCORE */
    #endif /* _KERNEL */
    #endif /* _SYS_SMP_H_ */

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