smp.h revision 96999 
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: head/sys/sys/smp.h 96999 2002-05-20 16:11:38Z jake $
10 */
11
12#ifndef _SYS_SMP_H_
13#define _SYS_SMP_H_
14
15#ifdef _KERNEL
16
17#ifndef LOCORE
18
19#ifdef SMP
20extern void (*cpustop_restartfunc)(void);
21extern int mp_ncpus;
22extern int smp_active;
23extern volatile int smp_started;
24extern int smp_cpus;
25extern u_int all_cpus;
26extern volatile u_int started_cpus;
27extern volatile u_int stopped_cpus;
28extern u_int mp_maxid;
29
30/*
31 * Macro allowing us to determine whether a CPU is absent at any given
32 * time, thus permitting us to configure sparse maps of cpuid-dependent
33 * (per-CPU) structures.
34 */
35#define	CPU_ABSENT(x_cpu)	((all_cpus & (1 << (x_cpu))) == 0)
36
37/*
38 * Machine dependent functions used to initialize MP support.
39 *
40 * The cpu_mp_probe() should check to see if MP support is present and return
41 * zero if it is not or non-zero if it is.  If MP support is present, then
42 * cpu_mp_start() will be called so that MP can be enabled.  This function
43 * should do things such as startup secondary processors.  It should also
44 * setup mp_ncpus, all_cpus, and smp_cpus.  It should also ensure that
45 * smp_active and smp_started are initialized at the appropriate time.
46 * Once cpu_mp_start() returns, machine independent MP startup code will be
47 * executed and a simple message will be output to the console.  Finally,
48 * cpu_mp_announce() will be called so that machine dependent messages about
49 * the MP support may be output to the console if desired.
50 */
51struct thread;
52
53void	cpu_mp_announce(void);
54int	cpu_mp_probe(void);
55void	cpu_mp_start(void);
56
57void	forward_signal(struct thread *);
58void	forward_roundrobin(void);
59int	restart_cpus(u_int);
60int	stop_cpus(u_int);
61void	smp_rendezvous_action(void);
62void	smp_rendezvous(void (*)(void *),
63		       void (*)(void *),
64		       void (*)(void *),
65		       void *arg);
66#else /* SMP */
67#define	CPU_ABSENT(x_cpu)	(0)
68#endif /* SMP */
69#endif /* !LOCORE */
70#endif /* _KERNEL */
71#endif /* _SYS_SMP_H_ */
72