sys/sys/systimer.h

   1 /*
   2  * SYS/SYSTIMER.H
   3  *
   4  * Copyright (c) 2003,2004 The DragonFly Project.  All rights reserved.
   5  *
   6  * This code is derived from software contributed to The DragonFly Project
   7  * by Matthew Dillon <dillon@backplane.com>
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  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
  18  *    distribution.
  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.
  22  *
  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
  34  * SUCH DAMAGE.
  35  *
  36  * $DragonFly: src/sys/sys/systimer.h,v 1.13 2007/04/30 06:57:36 dillon Exp $
  37  */
  38
  39 #ifndef _SYS_SYSTIMER_H_
  40 #define _SYS_SYSTIMER_H_
  41
  42 #ifndef _SYS_TYPES_H_
  43 #include <sys/types.h>
  44 #endif
  45 #ifndef _SYS_QUEUE_H_
  46 #include <sys/queue.h>
  47 #endif
  48
  49 struct intrframe;
  50
  51 typedef __uint32_t      sysclock_t;
  52 typedef TAILQ_HEAD(systimerq, systimer) *systimerq_t;
  53 typedef void (*systimer_func_t)(struct systimer *info);
  54 typedef void (*systimer_func2_t)(struct systimer *info, struct intrframe *frame);
  55
  56 typedef struct systimer {
  57     TAILQ_ENTRY(systimer)       node;
  58     systimerq_t                 queue;
  59     sysclock_t                  time;           /* absolute time next intr */
  60     sysclock_t                  periodic;       /* if non-zero */
  61     systimer_func2_t            func;
  62     void                        *data;
  63     int                         flags;
  64     int                         freq;           /* frequency if periodic */
  65     struct cputimer             *which;         /* which timer was used? */
  66     struct globaldata           *gd;            /* cpu owning structure */
  67 } *systimer_t;
  68
  69 #define SYSTF_ONQUEUE           0x0001
  70 #define SYSTF_IPIRUNNING        0x0002
  71 #define SYSTF_NONQUEUED         0x0004
  72
  73 void systimer_intr(sysclock_t *, int, struct intrframe *);
  74 void systimer_add(systimer_t);
  75 void systimer_del(systimer_t);
  76 void systimer_init_periodic(systimer_t, void *, void *, int);
  77 void systimer_init_periodic_nq(systimer_t, void *, void *, int);
  78 void systimer_adjust_periodic(systimer_t, int);
  79 void systimer_init_oneshot(systimer_t, void *, void *, int);
  80 void systimer_changed(void);
  81
  82 /*
  83  * cputimer interface.  This provides a free-running (non-interrupt)
  84  * timebase for the system.  The cputimer
  85  *
  86  * These variables hold the fixed cputimer frequency, determining the
  87  * granularity of cputimer_count().
  88  *
  89  * The 64 bit versions are used for converting count values into uS or nS
  90  * as follows:
  91  *
  92  *      usec = (cputimer_freq64_usec * count) >> 32
  93  */
  94
  95 struct cputimer {
  96     SLIST_ENTRY(cputimer) next;
  97     const char  *name;
  98     int         pri;
  99     int         type;
 100     sysclock_t  (*count)(void);
 101     sysclock_t  (*fromhz)(int freq);
 102     sysclock_t  (*fromus)(int us);
 103     void        (*construct)(struct cputimer *cputimer, sysclock_t oldclock);
 104     void        (*destruct)(struct cputimer *cputimer);
 105     sysclock_t  freq;           /* in Hz */
 106     int64_t     freq64_usec;    /* in (1e6 << 32) / timer_freq */
 107     int64_t     freq64_nsec;    /* in (1e9 << 32) / timer_freq */
 108     sysclock_t  base;           /* (implementation dependant) */
 109 };
 110
 111 extern struct cputimer *sys_cputimer;
 112
 113 #define CPUTIMER_DUMMY          0
 114 #define CPUTIMER_8254_SEL1      1
 115 #define CPUTIMER_8254_SEL2      2
 116 #define CPUTIMER_ACPI           3
 117 #define CPUTIMER_VKERNEL        4
 118
 119 #define CPUTIMER_PRI_DUMMY      -10
 120 #define CPUTIMER_PRI_8254       0
 121 #define CPUTIMER_PRI_ACPI       10
 122 #define CPUTIMER_PRI_VKERNEL    20
 123
 124 /*
 125  * note that cputimer_count() always returns a full-width wrapping counter.
 126  */
 127 void cputimer_select(struct cputimer *, int);
 128 void cputimer_register(struct cputimer *);
 129 void cputimer_deregister(struct cputimer *);
 130 void cputimer_set_frequency(struct cputimer *, int);
 131 sysclock_t cputimer_default_fromhz(int);
 132 sysclock_t cputimer_default_fromus(int);
 133 void cputimer_default_construct(struct cputimer *, sysclock_t);
 134 void cputimer_default_destruct(struct cputimer *);
 135
 136 void cputimer_intr_config(struct cputimer *);
 137 void cputimer_intr_reload(sysclock_t);
 138
 139 #endif
 140