4 * Copyright (c) 2003,2004 The DragonFly Project. All rights reserved.
6 * This code is derived from software contributed to The DragonFly Project
7 * by Matthew Dillon <dillon@backplane.com>
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
19 * 3. Neither the name of The DragonFly Project nor the names of its
20 * contributors may be used to endorse or promote products derived
21 * from this software without specific, prior written permission.
23 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
24 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
25 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
26 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
27 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
28 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
29 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
30 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
31 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
32 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
33 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * $DragonFly: src/sys/sys/systimer.h,v 1.5 2005/06/01 17:43:43 dillon Exp $
39 #ifndef _SYS_SYSTIMER_H_
40 #define _SYS_SYSTIMER_H_
44 typedef __uint32_t sysclock_t;
45 typedef TAILQ_HEAD(systimerq, systimer) *systimerq_t;
46 typedef void (*systimer_func_t)(struct systimer *info);
47 typedef void (*systimer_func2_t)(struct systimer *info, struct intrframe *frame);
49 typedef struct systimer {
50 TAILQ_ENTRY(systimer) node;
52 sysclock_t time; /* absolute time next intr */
53 sysclock_t periodic; /* if non-zero */
54 systimer_func2_t func;
57 struct globaldata *gd; /* cpu owning structure */
60 #define SYSTF_ONQUEUE 0x0001
61 #define SYSTF_IPIRUNNING 0x0002
62 #define SYSTF_NONQUEUED 0x0004
64 void systimer_intr(sysclock_t *time, struct intrframe *frame);
65 void systimer_add(systimer_t info);
66 void systimer_del(systimer_t info);
67 void systimer_init_periodic(systimer_t info, void *func, void *data, int syshz);
68 void systimer_init_periodic_nq(systimer_t info, void *func, void *data, int syshz);
69 void systimer_init_oneshot(systimer_t info, void *func, void *data, int us);
72 * cputimer interface. This provides a free-running (non-interrupt)
73 * timebase for the system. The cputimer
75 * These variables hold the fixed cputimer frequency, determining the
76 * granularity of cputimer_count().
78 * The 64 bit versions are used for converting count values into uS or nS
81 * usec = (cputimer_freq64_usec * count) >> 32
88 sysclock_t (*count)(void);
89 sysclock_t (*fromhz)(int freq);
90 sysclock_t (*fromus)(int us);
91 void (*construct)(struct cputimer *cputimer, sysclock_t oldclock);
92 void (*destruct)(struct cputimer *cputimer);
93 sysclock_t freq; /* in Hz */
94 int64_t freq64_usec; /* in (1e6 << 32) / timer_freq */
95 int64_t freq64_nsec; /* in (1e9 << 32) / timer_freq */
96 sysclock_t base; /* (implementation dependant) */
99 extern struct cputimer *sys_cputimer;
101 #define CPUTIMER_DUMMY 0
102 #define CPUTIMER_8254_SEL1 1
103 #define CPUTIMER_8254_SEL2 2
104 #define CPUTIMER_ACPI 3
106 #define CPUTIMER_PRI_DUMMY -10
107 #define CPUTIMER_PRI_8254 0
108 #define CPUTIMER_PRI_ACPI 10
111 * note that cputimer_count() always returns a full-width wrapping counter.
113 void cputimer_select(struct cputimer *timer);
114 sysclock_t cputimer_default_fromhz(int freq);
115 sysclock_t cputimer_default_fromus(int us);
117 void cputimer_intr_reload(sysclock_t clock);