| 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 | |