arch/x86/kernel/platform/i86pc/include/sys/clock.h

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25
  26 #ifndef _SYS_CLOCK_H
  27 #define _SYS_CLOCK_H
  28
  29 #pragma ident   "%Z%%M% %I%     %E% SMI"
  30
  31 #ifdef  __cplusplus
  32 extern "C" {
  33 #endif
  34
  35 #ifdef  _KERNEL
  36
  37 #ifndef _ASM
  38
  39 #include <sys/psw.h>
  40 #include <sys/time.h>
  41 #include <sys/processor.h>
  42 #if defined(__GNUC__) && defined(_ASM_INLINES)
  43 #include <asm/clock.h>
  44 #endif
  45 #include <sys/machclock.h>
  46
  47 extern time_t ggmtl(void);
  48 extern void sgmtl(time_t);
  49 extern void rtcsync(void);
  50
  51 extern void unlock_hres_lock(void);
  52 extern void hres_tick(void);
  53 extern void (*hrtime_tick)(void);
  54
  55 #ifndef __xpv
  56 extern void tsc_hrtimeinit(uint64_t cpu_freq_hz);
  57 extern void tsc_sync_master(processorid_t);
  58 extern void tsc_sync_slave(void);
  59 #endif
  60
  61 /*
  62  * Careful: this can always return zero on some systems.  Use the system hrtime
  63  * routines if you want a meaningful time.
  64  */
  65 extern hrtime_t tsc_read(void);
  66
  67 extern hrtime_t __rdtsc_insn(void);
  68
  69 extern int tsc_gethrtime_enable;
  70
  71 #define ADJ_SHIFT 4             /* used in get_hrestime */
  72
  73 #define YRBASE          00      /* 1900 - what year 0 in chip represents */
  74
  75 #endif  /* !_ASM */
  76
  77 #define CBE_HIGH_PIL    14
  78 #define CBE_LOCK_PIL    LOCK_LEVEL
  79 #define CBE_LOW_PIL     2
  80
  81 /*
  82  * CLOCK_LOCK() sets the LSB (bit 0) of the hres_lock. The rest of the
  83  * 31bits are used as the counter. This lock is acquired
  84  * around "hrestime" and "timedelta". This lock is acquired to make
  85  * sure that level-14 accounts for changes to this variable in that
  86  * interrupt itself. The level-14 interrupt code also acquires this
  87  * lock.
  88  * (Note: It is assumed that the lock_set_spl() uses only bit 0 of the lock.)
  89  *
  90  * CLOCK_UNLOCK() increments the lower bytes straight, thus clearing the
  91  * lock and also incrementing the counter. This way gethrtime()
  92  * can figure out if the value in the lock got changed or not.
  93  */
  94 #define HRES_LOCK_OFFSET 0      /* byte 0 has the lock bit(bit 0 in the byte) */
  95
  96 #define CLOCK_LOCK(oldsplp)     \
  97         lock_set_spl((lock_t *)&hres_lock + HRES_LOCK_OFFSET,   \
  98                 ipltospl(XC_HI_PIL), oldsplp)
  99
 100 #define CLOCK_UNLOCK(spl)               \
 101         unlock_hres_lock();             \
 102         splx(spl);                      \
 103         LOCKSTAT_RECORD0(LS_CLOCK_UNLOCK_RELEASE,       \
 104                 (lock_t *)&hres_lock + HRES_LOCK_OFFSET);
 105
 106 #endif  /* KERNEL */
 107
 108 #ifdef  __cplusplus
 109 }
 110 #endif
 111
 112 #endif  /* _SYS_CLOCK_H */