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 * ----------------------------------------------------------------------------
22 * Topology of a NUMA or HTT system.
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.
28 * The bitmasks at non leaf groups may be used by consumers who support
29 * a smaller depth than the hardware provides.
31 * The topology may be omitted by systems where all CPUs are equal.
35 u_int 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. */
42 int ct_count; /* Count of groups. */
43 struct cpu_group *ct_group; /* Array of pointers to cpu groups. */
46 extern struct cpu_top *smp_topology;
47 extern void (*cpustop_restartfunc)(void);
49 extern int smp_active;
50 extern volatile int smp_started;
52 extern u_int all_cpus;
53 extern volatile u_int started_cpus;
54 extern volatile u_int stopped_cpus;
55 extern u_int mp_maxid;
58 * Macro allowing us to determine whether a CPU is absent at any given
59 * time, thus permitting us to configure sparse maps of cpuid-dependent
60 * (per-CPU) structures.
62 #define CPU_ABSENT(x_cpu) ((all_cpus & (1 << (x_cpu))) == 0)
65 * Machine dependent functions used to initialize MP support.
67 * The cpu_mp_probe() should check to see if MP support is present and return
68 * zero if it is not or non-zero if it is. If MP support is present, then
69 * cpu_mp_start() will be called so that MP can be enabled. This function
70 * should do things such as startup secondary processors. It should also
71 * setup mp_ncpus, all_cpus, and smp_cpus. It should also ensure that
72 * smp_active and smp_started are initialized at the appropriate time.
73 * Once cpu_mp_start() returns, machine independent MP startup code will be
74 * executed and a simple message will be output to the console. Finally,
75 * cpu_mp_announce() will be called so that machine dependent messages about
76 * the MP support may be output to the console if desired.
80 void cpu_mp_announce(void);
81 int cpu_mp_probe(void);
82 void cpu_mp_start(void);
84 void forward_signal(struct thread *);
85 void forward_roundrobin(void);
86 int restart_cpus(u_int);
88 void smp_rendezvous_action(void);
89 void smp_rendezvous(void (*)(void *),
94 #define CPU_ABSENT(x_cpu) (0)
98 #endif /* _SYS_SMP_H_ */