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 1.2 2004/07/16 05:51:57 dillon Exp $ 37 */ 38 39 #ifndef _SYS_SYSTIMER_H_ 40 #define _SYS_SYSTIMER_H_ 41 42 struct intrframe; 43 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); 48 49 typedef struct systimer { 50 TAILQ_ENTRY(systimer) node; 51 systimerq_t queue; 52 sysclock_t time; /* absolute time next intr */ 53 sysclock_t periodic; /* if non-zero */ 54 systimer_func2_t func; 55 void *data; 56 int flags; 57 struct globaldata *gd; /* cpu owning structure */ 58 } *systimer_t; 59 60 #define SYSTF_ONQUEUE 0x0001 61 #define SYSTF_IPIRUNNING 0x0002 62 63 void systimer_intr(sysclock_t *time, struct intrframe *frame); 64 void systimer_add(systimer_t info); 65 void systimer_del(systimer_t info); 66 void systimer_init_periodic(systimer_t info, void *func, void *data, int hz); 67 void systimer_init_oneshot(systimer_t info, void *func, void *data, int us); 68 69 70 /* 71 * note that cputimer_count() always returns a full-width wrapping counter. 72 */ 73 sysclock_t cputimer_count(void); 74 sysclock_t cputimer_fromhz(int freq); 75 sysclock_t cputimer_fromus(int us); 76 void cputimer_intr_reload(sysclock_t clock); 77 78 /* 79 * These variables hold the fixed cputimer frequency, determining the 80 * granularity of cputimer_count(). 81 * 82 * The 64 bit versions are used for converting count values into uS or nS 83 * as follows: 84 * 85 * usec = (cputimer_freq64_usec * count) >> 32 86 */ 87 extern sysclock_t cputimer_freq; /* in Hz */ 88 extern int64_t cputimer_freq64_usec; /* in (1e6 << 32) / timer_freq */ 89 extern int64_t cputimer_freq64_nsec; /* in (1e9 << 32) / timer_freq */ 90 91 #endif 92 93