cyclic_machdep.c revision 216505 
1/*-
2 * Copyright 2006-2008 John Birrell <jb@FreeBSD.org>
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * SUCH DAMAGE.
24 *
25 * $FreeBSD: head/sys/cddl/dev/cyclic/i386/cyclic_machdep.c 216505 2010-12-17 18:22:50Z avg $
26 *
27 */
28
29static void enable(cyb_arg_t);
30static void disable(cyb_arg_t);
31static void reprogram(cyb_arg_t, hrtime_t);
32static void xcall(cyb_arg_t, cpu_t *, cyc_func_t, void *);
33
34static cyc_backend_t	be	= {
35	NULL,		/* cyb_configure */
36	NULL,		/* cyb_unconfigure */
37	enable,
38	disable,
39	reprogram,
40	xcall,
41	NULL		/* cyb_arg_t cyb_arg */
42};
43
44static void
45cyclic_ap_start(void *dummy)
46{
47	/* Initialise the rest of the CPUs. */
48	cyclic_mp_init();
49}
50
51SYSINIT(cyclic_ap_start, SI_SUB_SMP, SI_ORDER_ANY, cyclic_ap_start, NULL);
52
53/*
54 *  Machine dependent cyclic subsystem initialisation.
55 */
56static void
57cyclic_machdep_init(void)
58{
59	/* Register the cyclic backend. */
60	cyclic_init(&be);
61}
62
63static void
64cyclic_machdep_uninit(void)
65{
66	int i;
67
68	for (i = 0; i <= mp_maxid; i++)
69		/* Reset the cyclic clock callback hook. */
70		cyclic_clock_func[i] = NULL;
71
72	/* De-register the cyclic backend. */
73	cyclic_uninit();
74}
75
76static hrtime_t exp_due[MAXCPU];
77
78/*
79 * This function is the one registered by the machine dependent
80 * initialiser as the callback for high speed timer events.
81 */
82static void
83cyclic_clock(struct trapframe *frame)
84{
85	cpu_t *c = &solaris_cpu[curcpu];
86
87	if (c->cpu_cyclic != NULL && gethrtime() >= exp_due[curcpu]) {
88		if (TRAPF_USERMODE(frame)) {
89			c->cpu_profile_pc = 0;
90			c->cpu_profile_upc = TRAPF_PC(frame);
91		} else {
92			c->cpu_profile_pc = TRAPF_PC(frame);
93			c->cpu_profile_upc = 0;
94		}
95
96		c->cpu_intr_actv = 1;
97
98		/* Fire any timers that are due. */
99		cyclic_fire(c);
100
101		c->cpu_intr_actv = 0;
102	}
103}
104
105static void enable(cyb_arg_t arg)
106{
107	/* Register the cyclic clock callback function. */
108	cyclic_clock_func[curcpu] = cyclic_clock;
109}
110
111static void disable(cyb_arg_t arg)
112{
113	/* Reset the cyclic clock callback function. */
114	cyclic_clock_func[curcpu] = NULL;
115}
116
117static void reprogram(cyb_arg_t arg, hrtime_t exp)
118{
119	exp_due[curcpu] = exp;
120}
121
122static void xcall(cyb_arg_t arg, cpu_t *c, cyc_func_t func, void *param)
123{
124
125	smp_rendezvous_cpus((cpumask_t) (1 << c->cpuid),
126	    smp_no_rendevous_barrier, func, smp_no_rendevous_barrier, param);
127}
128