osfmk/kern/clock.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * @OSF_COPYRIGHT@
  24  */
  25 /*
  26  *      File:           kern/clock.h
  27  *      Purpose:        Data structures for the kernel alarm clock
  28  *                      facility. This file is used only by kernel
  29  *                      level clock facility routines.
  30  */
  31
  32 #ifndef _KERN_CLOCK_H_
  33 #define _KERN_CLOCK_H_
  34
  35 #include <mach/message.h>
  36 #include <mach/clock_types.h>
  37 #include <mach/mach_time.h>
  38
  39 #include <sys/appleapiopts.h>
  40
  41 #ifdef  __APPLE_API_PRIVATE
  42
  43 #ifdef  MACH_KERNEL_PRIVATE
  44
  45 #include <ipc/ipc_port.h>
  46
  47 /*
  48  * Actual clock alarm structure. Used for user clock_sleep() and
  49  * clock_alarm() calls. Alarms are allocated from the alarm free
  50  * list and entered in time priority order into the active alarm
  51  * chain of the target clock.
  52  */
  53 struct  alarm {
  54         struct  alarm   *al_next;               /* next alarm in chain */
  55         struct  alarm   *al_prev;               /* previous alarm in chain */
  56         int                             al_status;              /* alarm status */
  57         mach_timespec_t al_time;                /* alarm time */
  58         struct {                                /* message alarm data */
  59                 int                             type;           /* alarm type */
  60                 ipc_port_t              port;           /* alarm port */
  61                 mach_msg_type_name_t
  62                                                 port_type;      /* alarm port type */
  63                 struct  clock   *clock;         /* alarm clock */
  64                 void                    *data;          /* alarm data */
  65         } al_alrm;
  66 #define al_type         al_alrm.type
  67 #define al_port         al_alrm.port
  68 #define al_port_type    al_alrm.port_type
  69 #define al_clock        al_alrm.clock
  70 #define al_data         al_alrm.data
  71         long                    al_seqno;               /* alarm sequence number */
  72 };
  73 typedef struct alarm    alarm_data_t;
  74
  75 /* alarm status */
  76 #define ALARM_FREE      0               /* alarm is on free list */
  77 #define ALARM_SLEEP     1               /* active clock_sleep() */
  78 #define ALARM_CLOCK     2               /* active clock_alarm() */
  79 #define ALARM_DONE      4               /* alarm has expired */
  80
  81 /*
  82  * Clock operations list structure. Contains vectors to machine
  83  * dependent clock routines. The routines c_config, c_init, and
  84  * c_gettime must be implemented for every clock device.
  85  */
  86 struct  clock_ops {
  87         int             (*c_config)(void);              /* configuration */
  88
  89         int             (*c_init)(void);                /* initialize */
  90
  91         kern_return_t   (*c_gettime)(   /* get time */
  92                                 mach_timespec_t                 *cur_time);
  93
  94         kern_return_t   (*c_settime)(   /* set time */
  95                                 mach_timespec_t                 *clock_time);
  96
  97         kern_return_t   (*c_getattr)(   /* get attributes */
  98                                 clock_flavor_t                  flavor,
  99                                 clock_attr_t                    attr,
 100                                 mach_msg_type_number_t  *count);
 101
 102         kern_return_t   (*c_setattr)(   /* set attributes */
 103                                 clock_flavor_t                  flavor,
 104                                 clock_attr_t                    attr,
 105                                 mach_msg_type_number_t  count);
 106
 107         void            (*c_setalrm)(           /* set next alarm */
 108                                 mach_timespec_t                 *alarm_time);
 109 };
 110 typedef struct clock_ops        *clock_ops_t;
 111 typedef struct clock_ops        clock_ops_data_t;
 112
 113 /*
 114  * Actual clock object data structure. Contains the machine
 115  * dependent operations list, clock operations ports, and a
 116  * chain of pending alarms.
 117  */
 118 struct  clock {
 119         clock_ops_t                     cl_ops;                 /* operations list */
 120         struct ipc_port         *cl_service;    /* service port */
 121         struct ipc_port         *cl_control;    /* control port */
 122         struct  {                                                       /* alarm chain head */
 123                 struct alarm    *al_next;
 124         } cl_alarm;
 125 };
 126 typedef struct clock            clock_data_t;
 127
 128 /*
 129  * Configure the clock system.
 130  */
 131 extern void             clock_config(void);
 132
 133 /*
 134  * Initialize the clock system.
 135  */
 136 extern void             clock_init(void);
 137
 138 extern void             clock_timebase_init(void);
 139
 140 /*
 141  * Initialize the clock ipc service facility.
 142  */
 143 extern void             clock_service_create(void);
 144
 145 /*
 146  * Service clock alarm interrupts. Called from machine dependent
 147  * layer at splclock(). The clock_id argument specifies the clock,
 148  * and the clock_time argument gives that clock's current time.
 149  */
 150 extern void             clock_alarm_intr(
 151                                         clock_id_t              clock_id,
 152                                         mach_timespec_t *clock_time);
 153
 154 extern kern_return_t    clock_sleep_internal(
 155                                                         clock_t                 clock,
 156                                                         sleep_type_t    sleep_type,
 157                                                         mach_timespec_t *sleep_time);
 158
 159 typedef void            (*clock_timer_func_t)(
 160                                                 uint64_t                        timestamp);
 161
 162 extern void                     clock_set_timer_func(
 163                                                 clock_timer_func_t      func);
 164
 165 extern void                     clock_set_timer_deadline(
 166                                                 uint64_t                        deadline);
 167
 168 extern void                     mk_timebase_info(
 169                                                 uint32_t                        *delta,
 170                                                 uint32_t                        *abs_to_ns_numer,
 171                                                 uint32_t                        *abs_to_ns_denom,
 172                                                 uint32_t                        *proc_to_abs_numer,
 173                                                 uint32_t                        *proc_to_abs_denom);
 174
 175 extern uint32_t         clock_set_calendar_adjtime(
 176                                                 int32_t                         *secs,
 177                                                 int32_t                         *microsecs);
 178
 179 extern uint32_t         clock_adjust_calendar(void);
 180
 181 #endif /* MACH_KERNEL_PRIVATE */
 182
 183 extern void                     clock_get_calendar_microtime(
 184                                                 uint32_t                        *secs,
 185                                                 uint32_t                        *microsecs);
 186
 187 extern void                     clock_get_calendar_nanotime(
 188                                                 uint32_t                        *secs,
 189                                                 uint32_t                        *nanosecs);
 190
 191 extern void                     clock_set_calendar_microtime(
 192                                                 uint32_t                        secs,
 193                                                 uint32_t                        microsecs);
 194
 195 extern void                     clock_get_system_microtime(
 196                                                 uint32_t                        *secs,
 197                                                 uint32_t                        *microsecs);
 198
 199 extern void                     clock_get_system_nanotime(
 200                                                 uint32_t                        *secs,
 201                                                 uint32_t                        *nanosecs);
 202
 203 extern void                     clock_adjtime(
 204                                                 int32_t         *secs,
 205                                                 int32_t         *microsecs);
 206
 207 extern void                     clock_initialize_calendar(void);
 208
 209 extern void                     clock_wakeup_calendar(void);
 210
 211 extern void                     clock_gettimeofday(
 212                         uint32_t                        *secs,
 213                         uint32_t                        *microsecs);
 214
 215 #endif  /* __APPLE_API_PRIVATE */
 216
 217 #ifdef  __APPLE_API_UNSTABLE
 218
 219 #define MACH_TIMESPEC_SEC_MAX           (0 - 1)
 220 #define MACH_TIMESPEC_NSEC_MAX          (NSEC_PER_SEC - 1)
 221
 222 #define MACH_TIMESPEC_MAX       ((mach_timespec_t) {                            \
 223                                                                         MACH_TIMESPEC_SEC_MAX,          \
 224                                                                         MACH_TIMESPEC_NSEC_MAX } )
 225 #define MACH_TIMESPEC_ZERO      ((mach_timespec_t) { 0, 0 } )
 226
 227 #define ADD_MACH_TIMESPEC_NSEC(t1, nsec)                \
 228   do {                                                                                  \
 229         (t1)->tv_nsec += (clock_res_t)(nsec);           \
 230         if ((clock_res_t)(nsec) > 0 &&                          \
 231                         (t1)->tv_nsec >= NSEC_PER_SEC) {        \
 232                 (t1)->tv_nsec -= NSEC_PER_SEC;                  \
 233                 (t1)->tv_sec += 1;                                              \
 234         }                                                                                       \
 235         else if ((clock_res_t)(nsec) < 0 &&                     \
 236                                  (t1)->tv_nsec < 0) {                   \
 237                 (t1)->tv_nsec += NSEC_PER_SEC;                  \
 238                 (t1)->tv_sec -= 1;                                              \
 239         }                                                                                       \
 240   } while (0)
 241
 242 #endif  /* __APPLE_API_UNSTABLE */
 243
 244 extern mach_timespec_t  clock_get_system_value(void);
 245
 246 extern mach_timespec_t  clock_get_calendar_value(void);
 247
 248 extern void                             clock_timebase_info(
 249                                                         mach_timebase_info_t    info);
 250
 251 extern void                             clock_get_uptime(
 252                                                         uint64_t                *result);
 253
 254 extern void                             clock_interval_to_deadline(
 255                                                         uint32_t                interval,
 256                                                         uint32_t                scale_factor,
 257                                                         uint64_t                *result);
 258
 259 extern void                             clock_interval_to_absolutetime_interval(
 260                                                         uint32_t                interval,
 261                                                         uint32_t                scale_factor,
 262                                                         uint64_t                *result);
 263
 264 extern void                             clock_absolutetime_interval_to_deadline(
 265                                                         uint64_t                abstime,
 266                                                         uint64_t                *result);
 267
 268 extern void                             clock_deadline_for_periodic_event(
 269                                                         uint64_t                interval,
 270                                                         uint64_t                abstime,
 271                                                         uint64_t                *deadline);
 272
 273 extern void                             clock_delay_for_interval(
 274                                                         uint32_t                interval,
 275                                                         uint32_t                scale_factor);
 276
 277 extern void                             clock_delay_until(
 278                                                         uint64_t                deadline);
 279
 280 extern void                             absolutetime_to_nanoseconds(
 281                                                         uint64_t                abstime,
 282                                                         uint64_t                *result);
 283
 284 extern void             nanoseconds_to_absolutetime(
 285                                                         uint64_t                nanoseconds,
 286                                                         uint64_t                *result);
 287
 288 #if             !defined(MACH_KERNEL_PRIVATE) && !defined(ABSOLUTETIME_SCALAR_TYPE)
 289
 290 #include <libkern/OSBase.h>
 291
 292 #define clock_get_uptime(a)             \
 293         clock_get_uptime(__OSAbsoluteTimePtr(a))
 294
 295 #define clock_interval_to_deadline(a, b, c)             \
 296         clock_interval_to_deadline((a), (b), __OSAbsoluteTimePtr(c))
 297
 298 #define clock_interval_to_absolutetime_interval(a, b, c)        \
 299         clock_interval_to_absolutetime_interval((a), (b), __OSAbsoluteTimePtr(c))
 300
 301 #define clock_absolutetime_interval_to_deadline(a, b)   \
 302         clock_absolutetime_interval_to_deadline(__OSAbsoluteTime(a), __OSAbsoluteTimePtr(b))
 303
 304 #define clock_deadline_for_periodic_event(a, b, c)      \
 305         clock_deadline_for_periodic_event(__OSAbsoluteTime(a), __OSAbsoluteTime(b), __OSAbsoluteTimePtr(c))
 306
 307 #define clock_delay_until(a)    \
 308         clock_delay_until(__OSAbsoluteTime(a))
 309
 310 #define absolutetime_to_nanoseconds(a, b)       \
 311         absolutetime_to_nanoseconds(__OSAbsoluteTime(a), (b))
 312
 313 #define nanoseconds_to_absolutetime(a, b)       \
 314         nanoseconds_to_absolutetime((a), __OSAbsoluteTimePtr(b))
 315
 316 #define AbsoluteTime_to_scalar(x)       (*(uint64_t *)(x))
 317
 318 /* t1 < = > t2 */
 319 #define CMP_ABSOLUTETIME(t1, t2)                                \
 320         (AbsoluteTime_to_scalar(t1) >                           \
 321                 AbsoluteTime_to_scalar(t2)? (int)+1 :   \
 322          (AbsoluteTime_to_scalar(t1) <                          \
 323                 AbsoluteTime_to_scalar(t2)? (int)-1 : 0))
 324
 325 /* t1 += t2 */
 326 #define ADD_ABSOLUTETIME(t1, t2)                                \
 327         (AbsoluteTime_to_scalar(t1) +=                          \
 328                                 AbsoluteTime_to_scalar(t2))
 329
 330 /* t1 -= t2 */
 331 #define SUB_ABSOLUTETIME(t1, t2)                                \
 332         (AbsoluteTime_to_scalar(t1) -=                          \
 333                                 AbsoluteTime_to_scalar(t2))
 334
 335 #define ADD_ABSOLUTETIME_TICKS(t1, ticks)               \
 336         (AbsoluteTime_to_scalar(t1) +=                          \
 337                                                 (int32_t)(ticks))
 338
 339 #endif
 340
 341 #endif  /* _KERN_CLOCK_H_ */