The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*-
    2  * ----------------------------------------------------------------------------
    3  * "THE BEER-WARE LICENSE" (Revision 42):
    4  * <phk@FreeBSD.org> wrote this file.  As long as you retain this notice you
    5  * can do whatever you want with this stuff. If we meet some day, and you think
    6  * this stuff is worth it, you can buy me a beer in return.   Poul-Henning Kamp
    7  * ----------------------------------------------------------------------------
    8  *
    9  * $FreeBSD$
   10  */
   11 
   12 #ifndef _SYS_SMP_H_
   13 #define _SYS_SMP_H_
   14 
   15 #ifdef _KERNEL
   16 
   17 #ifndef LOCORE
   18 
   19 #ifdef SMP
   20 
   21 /*
   22  * Topology of a NUMA or HTT system.
   23  *
   24  * The top level topology is an array of pointers to groups.  Each group
   25  * contains a bitmask of cpus in its group or subgroups.  It may also
   26  * contain a pointer to an array of child groups.
   27  *
   28  * The bitmasks at non leaf groups may be used by consumers who support
   29  * a smaller depth than the hardware provides.
   30  *
   31  * The topology may be omitted by systems where all CPUs are equal.
   32  */
   33 
   34 struct cpu_group {
   35         cpumask_t cg_mask;              /* Mask of cpus in this group. */
   36         int     cg_count;               /* Count of cpus in this group. */
   37         int     cg_children;            /* Number of children groups. */
   38         struct cpu_group *cg_child;     /* Optional child group. */
   39 };
   40 
   41 struct cpu_top {
   42         int     ct_count;               /* Count of groups. */
   43         struct cpu_group *ct_group;     /* Array of pointers to cpu groups. */
   44 };
   45 
   46 extern struct cpu_top *smp_topology;
   47 extern void (*cpustop_restartfunc)(void);
   48 extern int smp_active;
   49 extern int smp_cpus;
   50 extern volatile cpumask_t started_cpus;
   51 extern volatile cpumask_t stopped_cpus;
   52 extern cpumask_t idle_cpus_mask;
   53 extern cpumask_t hlt_cpus_mask;
   54 extern cpumask_t logical_cpus_mask;
   55 #endif /* SMP */
   56 
   57 extern u_int mp_maxid;
   58 extern int mp_maxcpus;
   59 extern int mp_ncpus;
   60 extern volatile int smp_started;
   61 
   62 extern cpumask_t all_cpus;
   63 
   64 /*
   65  * Macro allowing us to determine whether a CPU is absent at any given
   66  * time, thus permitting us to configure sparse maps of cpuid-dependent
   67  * (per-CPU) structures.
   68  */
   69 #define CPU_ABSENT(x_cpu)       ((all_cpus & (1 << (x_cpu))) == 0)
   70 
   71 #ifdef SMP
   72 /*
   73  * Machine dependent functions used to initialize MP support.
   74  *
   75  * The cpu_mp_probe() should check to see if MP support is present and return
   76  * zero if it is not or non-zero if it is.  If MP support is present, then
   77  * cpu_mp_start() will be called so that MP can be enabled.  This function
   78  * should do things such as startup secondary processors.  It should also
   79  * setup mp_ncpus, all_cpus, and smp_cpus.  It should also ensure that
   80  * smp_active and smp_started are initialized at the appropriate time.
   81  * Once cpu_mp_start() returns, machine independent MP startup code will be
   82  * executed and a simple message will be output to the console.  Finally,
   83  * cpu_mp_announce() will be called so that machine dependent messages about
   84  * the MP support may be output to the console if desired.
   85  *
   86  * The cpu_setmaxid() function is called very early during the boot process
   87  * so that the MD code may set mp_maxid to provide an upper bound on CPU IDs
   88  * that other subsystems may use.  If a platform is not able to determine
   89  * the exact maximum ID that early, then it may set mp_maxid to MAXCPU - 1.
   90  */
   91 struct thread;
   92 
   93 void    cpu_mp_announce(void);
   94 int     cpu_mp_probe(void);
   95 void    cpu_mp_setmaxid(void);
   96 void    cpu_mp_start(void);
   97 
   98 void    forward_signal(struct thread *);
   99 void    forward_roundrobin(void);
  100 int     restart_cpus(cpumask_t);
  101 int     stop_cpus(cpumask_t);
  102 void    smp_rendezvous_action(void);
  103 extern  struct mtx smp_ipi_mtx;
  104 
  105 #ifdef KDB_STOP_NMI
  106 int     stop_cpus_nmi(cpumask_t);
  107 #endif 
  108 #endif /* SMP */
  109 void    smp_rendezvous(void (*)(void *), 
  110                        void (*)(void *),
  111                        void (*)(void *),
  112                        void *arg);
  113 #endif /* !LOCORE */
  114 #endif /* _KERNEL */
  115 #endif /* _SYS_SMP_H_ */

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