FreeBSD/Linux Kernel Cross Reference
sys/sys/smp.h
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: releng/5.2/sys/sys/smp.h 123126 2003-12-03 14:57:26Z jhb $
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 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. */
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 u_int started_cpus;
51 extern volatile u_int stopped_cpus;
52 #endif /* SMP */
53
54 extern u_int all_cpus;
55 extern u_int mp_maxid;
56 extern int mp_ncpus;
57 extern volatile int smp_started;
58
59 /*
60 * Macro allowing us to determine whether a CPU is absent at any given
61 * time, thus permitting us to configure sparse maps of cpuid-dependent
62 * (per-CPU) structures.
63 */
64 #define CPU_ABSENT(x_cpu) ((all_cpus & (1 << (x_cpu))) == 0)
65
66 #ifdef SMP
67 /*
68 * Machine dependent functions used to initialize MP support.
69 *
70 * The cpu_mp_probe() should check to see if MP support is present and return
71 * zero if it is not or non-zero if it is. If MP support is present, then
72 * cpu_mp_start() will be called so that MP can be enabled. This function
73 * should do things such as startup secondary processors. It should also
74 * setup mp_ncpus, all_cpus, and smp_cpus. It should also ensure that
75 * smp_active and smp_started are initialized at the appropriate time.
76 * Once cpu_mp_start() returns, machine independent MP startup code will be
77 * executed and a simple message will be output to the console. Finally,
78 * cpu_mp_announce() will be called so that machine dependent messages about
79 * the MP support may be output to the console if desired.
80 *
81 * The cpu_setmaxid() function is called very early during the boot process
82 * so that the MD code may set mp_maxid to provide an upper bound on CPU IDs
83 * that other subsystems may use. If a platform is not able to determine
84 * the exact maximum ID that early, then it may set mp_maxid to MAXCPU - 1.
85 */
86 struct thread;
87
88 void cpu_mp_announce(void);
89 int cpu_mp_probe(void);
90 void cpu_mp_setmaxid(void);
91 void cpu_mp_start(void);
92
93 void forward_signal(struct thread *);
94 void forward_roundrobin(void);
95 int restart_cpus(u_int);
96 int stop_cpus(u_int);
97 void smp_rendezvous_action(void);
98 #endif /* SMP */
99 void smp_rendezvous(void (*)(void *),
100 void (*)(void *),
101 void (*)(void *),
102 void *arg);
103 #endif /* !LOCORE */
104 #endif /* _KERNEL */
105 #endif /* _SYS_SMP_H_ */
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