1 /* $NetBSD: timer.h,v 1.5 2014/08/26 17:26:05 riastradh Exp $ */ 2 3 /*- 4 * Copyright (c) 2013 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Taylor R. Campbell. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 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 the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * Notes on porting: 34 * 35 * - Linux does not have teardown_timer. You must add it yourself in 36 * the appropriate place. 37 */ 38 39 #ifndef _LINUX_TIMER_H_ 40 #define _LINUX_TIMER_H_ 41 42 #include <sys/callout.h> 43 44 #include <linux/jiffies.h> 45 46 struct timer_list { 47 struct callout tl_callout; 48 }; 49 50 static inline void 51 setup_timer(struct timer_list *timer, void (*fn)(unsigned long), 52 unsigned long arg) 53 { 54 55 callout_init(&timer->tl_callout, 0); 56 57 /* XXX Super-sketchy casts! */ 58 callout_setfunc(&timer->tl_callout, (void (*)(void *))fn, 59 (void *)(uintptr_t)arg); 60 } 61 62 static inline void 63 teardown_timer(struct timer_list *timer) 64 { 65 66 callout_destroy(&timer->tl_callout); 67 } 68 69 static inline void 70 mod_timer(struct timer_list *timer, unsigned long then) 71 { 72 const unsigned long now = jiffies; 73 74 callout_schedule(&timer->tl_callout, (now < then? (then - now) : 0)); 75 } 76 77 static inline void 78 mod_timer_pinned(struct timer_list *timer, unsigned long then) 79 { 80 81 /* XXX Stay on the same CPU it was originally on... */ 82 mod_timer(timer, then); 83 } 84 85 static inline void 86 del_timer(struct timer_list *timer) 87 { 88 89 callout_stop(&timer->tl_callout); 90 } 91 92 static inline void 93 del_timer_sync(struct timer_list *timer) 94 { 95 96 callout_halt(&timer->tl_callout, NULL); 97 } 98 99 static inline bool 100 timer_pending(struct timer_list *timer) 101 { 102 103 return callout_pending(&timer->tl_callout); 104 } 105 106 /* 107 * XXX This is bogus -- the Linux version does various machinations to 108 * give some jitter so that stuff doesn't wake up all at once. 109 */ 110 111 static inline unsigned long 112 round_jiffies_up(unsigned long j) 113 { 114 return roundup(j, hz); 115 } 116 117 static inline unsigned long 118 round_jiffies_up_relative(unsigned long j) 119 { 120 return roundup(j, hz); 121 } 122 123 #endif /* _LINUX_TIMER_H_ */ 124