FreeBSD/Linux Kernel Cross Reference
sys/sys/pcpu.h
1 /*-
2 * Copyright (c) 2001 Wind River Systems, Inc.
3 * All rights reserved.
4 * Written by: John Baldwin <jhb@FreeBSD.org>
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 4. Neither the name of the author nor the names of any co-contributors
15 * may be used to endorse or promote products derived from this software
16 * without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 *
30 * $FreeBSD: releng/6.1/sys/sys/pcpu.h 158179 2006-04-30 16:44:43Z cvs2svn $
31 */
32
33 #ifndef _SYS_PCPU_H_
34 #define _SYS_PCPU_H_
35
36 #ifndef _KERNEL
37 #error "no user-serviceable parts inside"
38 #endif
39
40 #ifdef LOCORE
41 #error "no assembler-serviceable parts inside"
42 #endif
43
44 #include <sys/queue.h>
45 #include <sys/vmmeter.h>
46 #include <machine/pcpu.h>
47
48 struct pcb;
49 struct thread;
50
51 /*
52 * This structure maps out the global data that needs to be kept on a
53 * per-cpu basis. The members are accessed via the PCPU_GET/SET/PTR
54 * macros defined in <machine/pcpu.h>. Machine dependent fields are
55 * defined in the PCPU_MD_FIELDS macro defined in <machine/pcpu.h>.
56 */
57 struct pcpu {
58 struct thread *pc_curthread; /* Current thread */
59 struct thread *pc_idlethread; /* Idle thread */
60 struct thread *pc_fpcurthread; /* Fp state owner */
61 struct thread *pc_deadthread; /* Zombie thread or NULL */
62 struct pcb *pc_curpcb; /* Current pcb */
63 struct bintime pc_switchtime;
64 int pc_switchticks;
65 u_int pc_cpuid; /* This cpu number */
66 cpumask_t pc_cpumask; /* This cpu mask */
67 cpumask_t pc_other_cpus; /* Mask of all other cpus */
68 SLIST_ENTRY(pcpu) pc_allcpu;
69 struct lock_list_entry *pc_spinlocks;
70 #ifdef KTR_PERCPU
71 int pc_ktr_idx; /* Index into trace table */
72 char *pc_ktr_buf;
73 #endif
74 PCPU_MD_FIELDS;
75 struct vmmeter pc_cnt; /* VM stats counters */
76 struct device *pc_device;
77 };
78
79 SLIST_HEAD(cpuhead, pcpu);
80
81 extern struct cpuhead cpuhead;
82
83 #define curcpu PCPU_GET(cpuid)
84 #define curproc (curthread->td_proc)
85 #ifndef curthread
86 #define curthread PCPU_GET(curthread)
87 #endif
88
89 /*
90 * MI PCPU support functions
91 *
92 * PCPU_LAZY_INC() - Lazily increment a per-cpu stats counter, without
93 * guarenteeing atomicity or even necessarily consistency.
94 *
95 * XXX we need to create MD primitives to support
96 * this to guarentee at least some level of consistency,
97 * i.e., to prevent us from totally corrupting the
98 * counters due to preemption in a multi-instruction
99 * increment sequence for architectures that do not
100 * support single-instruction memory increments.
101 */
102 #define PCPU_LAZY_INC(var) (++*PCPU_PTR(var))
103
104 /*
105 * Machine dependent callouts. cpu_pcpu_init() is responsible for
106 * initializing machine dependent fields of struct pcpu, and
107 * db_show_mdpcpu() is responsible for handling machine dependent
108 * fields for the DDB 'show pcpu' command.
109 */
110 void cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t size);
111 void db_show_mdpcpu(struct pcpu *pcpu);
112
113 void pcpu_destroy(struct pcpu *pcpu);
114 struct pcpu *pcpu_find(u_int cpuid);
115 void pcpu_init(struct pcpu *pcpu, int cpuid, size_t size);
116
117 #endif /* !_SYS_PCPU_H_ */
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