1 /* 2 * SYS/SYSTIMER.H 3 * 4 * Copyright (c) 2003 Matthew Dillon <dillon@backplane.com> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $DragonFly: src/sys/sys/systimer.h,v 1.1 2004/01/30 05:42:18 dillon Exp $ 29 */ 30 31 #ifndef _SYS_SYSTIMER_H_ 32 #define _SYS_SYSTIMER_H_ 33 34 struct intrframe; 35 36 typedef __uint32_t sysclock_t; 37 typedef TAILQ_HEAD(systimerq, systimer) *systimerq_t; 38 typedef void (*systimer_func_t)(struct systimer *info); 39 typedef void (*systimer_func2_t)(struct systimer *info, struct intrframe *frame); 40 41 typedef struct systimer { 42 TAILQ_ENTRY(systimer) node; 43 systimerq_t queue; 44 sysclock_t time; /* absolute time next intr */ 45 sysclock_t periodic; /* if non-zero */ 46 systimer_func2_t func; 47 void *data; 48 int flags; 49 struct globaldata *gd; /* cpu owning structure */ 50 } *systimer_t; 51 52 #define SYSTF_ONQUEUE 0x0001 53 #define SYSTF_IPIRUNNING 0x0002 54 55 void systimer_intr(sysclock_t *time, struct intrframe *frame); 56 void systimer_add(systimer_t info); 57 void systimer_del(systimer_t info); 58 void systimer_init_periodic(systimer_t info, void *func, void *data, int hz); 59 void systimer_init_oneshot(systimer_t info, void *func, void *data, int us); 60 61 62 /* 63 * note that cputimer_count() always returns a full-width wrapping counter. 64 */ 65 sysclock_t cputimer_count(void); 66 sysclock_t cputimer_fromhz(int freq); 67 sysclock_t cputimer_fromus(int us); 68 void cputimer_intr_reload(sysclock_t clock); 69 70 /* 71 * These variables hold the fixed cputimer frequency, determining the 72 * granularity of cputimer_count(). 73 * 74 * The 64 bit versions are used for converting count values into uS or nS 75 * as follows: 76 * 77 * usec = (cputimer_freq64_usec * count) >> 32 78 */ 79 extern sysclock_t cputimer_freq; /* in Hz */ 80 extern int64_t cputimer_freq64_usec; /* in (1e6 << 32) / timer_freq */ 81 extern int64_t cputimer_freq64_nsec; /* in (1e9 << 32) / timer_freq */ 82 83 #endif 84 85