pcpu.h revision 71544 
1/*-
2 * Copyright (c) 1999 Luoqi Chen <luoqi@freebsd.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: head/sys/powerpc/include/pcpu.h 71544 2001-01-24 10:24:49Z jhb $
27 */
28
29#ifndef	_MACHINE_GLOBALDATA_H_
30#define	_MACHINE_GLOBALDATA_H_
31
32#ifdef _KERNEL
33
34#include <sys/queue.h>
35
36/*
37 * This structure maps out the global data that needs to be kept on a
38 * per-cpu basis.  genassym uses this to generate offsets for the assembler
39 * code, which also provides external symbols so that C can get at them as
40 * though they were really globals. This structure is pointed to by
41 * the per-cpu system value (see alpha_pal_rdval() and alpha_pal_wrval()).
42 * Inside the kernel, the globally reserved register t7 is used to
43 * point at the globaldata structure.
44 */
45struct globaldata {
46	struct alpha_pcb gd_idlepcb;		/* pcb for idling */
47	struct proc	*gd_curproc;		/* current process */
48	struct proc	*gd_idleproc;		/* idle process */
49	struct proc	*gd_fpcurproc;		/* fp state owner */
50	struct pcb	*gd_curpcb;		/* current pcb */
51	struct timeval	gd_switchtime;
52	int		gd_switchticks;
53	u_int		gd_cpuid;		/* this cpu number */
54	u_int		gd_other_cpus;		/* all other cpus */
55	u_int64_t	gd_idlepcbphys;		/* pa of gd_idlepcb */
56	u_int64_t	gd_pending_ipis;	/* pending IPI events */
57	u_int32_t	gd_next_asn;		/* next ASN to allocate */
58	u_int32_t	gd_current_asngen;	/* ASN rollover check */
59
60	u_int		gd_astpending;
61	SLIST_ENTRY(globaldata) gd_allcpu;
62	int		gd_witness_spin_check;
63#ifdef KTR_PERCPU
64	volatile int	gd_ktr_idx;		/* Index into trace table */
65	char		*gd_ktr_buf;
66	char		gd_ktr_buf_data[0];
67#endif
68};
69
70SLIST_HEAD(cpuhead, globaldata);
71extern struct cpuhead cpuhead;
72
73void globaldata_init(struct globaldata *pcpu, int cpuid, size_t sz);
74struct globaldata *globaldata_find(int cpuid);
75#ifdef SMP
76void globaldata_register(struct globaldata *pcpu);
77#endif
78
79#endif	/* _KERNEL */
80
81#endif	/* !_MACHINE_GLOBALDATA_H_ */
82