99 lines
3.1 KiB
C
99 lines
3.1 KiB
C
/*
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* ----------------------------------------------------------------------------
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* "THE BEER-WARE LICENSE" (Revision 42):
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* <phk@FreeBSD.org> wrote this file. As long as you retain this notice you
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* can do whatever you want with this stuff. If we meet some day, and you think
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* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
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* ----------------------------------------------------------------------------
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*
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* $FreeBSD$
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*/
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#ifndef _SYS_SMP_H_
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#define _SYS_SMP_H_
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#ifdef _KERNEL
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#ifndef LOCORE
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#ifdef SMP
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/*
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* Topology of a NUMA or HTT system.
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*
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* The top level topology is an array of pointers to groups. Each group
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* contains a bitmask of cpus in its group or subgroups. It may also
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* contain a pointer to an array of child groups.
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*
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* The bitmasks at non leaf groups may be used by consumers who support
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* a smaller depth than the hardware provides.
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*
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* The topology may be omitted by systems where all CPUs are equal.
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*/
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struct cpu_group {
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u_int cg_mask; /* Mask of cpus in this group. */
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int cg_count; /* Count of cpus in this group. */
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int cg_children; /* Number of children groups. */
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struct cpu_group *cg_child; /* Optional child group. */
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};
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struct cpu_top {
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int ct_count; /* Count of groups. */
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struct cpu_group *ct_group; /* Array of pointers to cpu groups. */
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};
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extern struct cpu_top *smp_topology;
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extern void (*cpustop_restartfunc)(void);
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extern int mp_ncpus;
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extern int smp_active;
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extern volatile int smp_started;
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extern int smp_cpus;
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extern u_int all_cpus;
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extern volatile u_int started_cpus;
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extern volatile u_int stopped_cpus;
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extern u_int mp_maxid;
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/*
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* Macro allowing us to determine whether a CPU is absent at any given
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* time, thus permitting us to configure sparse maps of cpuid-dependent
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* (per-CPU) structures.
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*/
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#define CPU_ABSENT(x_cpu) ((all_cpus & (1 << (x_cpu))) == 0)
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/*
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* Machine dependent functions used to initialize MP support.
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*
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* The cpu_mp_probe() should check to see if MP support is present and return
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* zero if it is not or non-zero if it is. If MP support is present, then
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* cpu_mp_start() will be called so that MP can be enabled. This function
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* should do things such as startup secondary processors. It should also
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* setup mp_ncpus, all_cpus, and smp_cpus. It should also ensure that
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* smp_active and smp_started are initialized at the appropriate time.
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* Once cpu_mp_start() returns, machine independent MP startup code will be
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* executed and a simple message will be output to the console. Finally,
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* cpu_mp_announce() will be called so that machine dependent messages about
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* the MP support may be output to the console if desired.
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*/
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struct thread;
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void cpu_mp_announce(void);
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int cpu_mp_probe(void);
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void cpu_mp_start(void);
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void forward_signal(struct thread *);
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void forward_roundrobin(void);
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int restart_cpus(u_int);
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int stop_cpus(u_int);
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void smp_rendezvous_action(void);
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void smp_rendezvous(void (*)(void *),
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void (*)(void *),
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void (*)(void *),
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void *arg);
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#else /* SMP */
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#define CPU_ABSENT(x_cpu) (0)
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#endif /* SMP */
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#endif /* !LOCORE */
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#endif /* _KERNEL */
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#endif /* _SYS_SMP_H_ */
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