arch/x86/kernel/platform/i86pc/include/sys/apic_timer.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 (c) 2010, Oracle and/or its affiliates. All rights reserved.
  23  */
  24 /*
  25  * Copyright (c) 2010, Intel Corporation.
  26  * All rights reserved.
  27  */
  28
  29 #ifndef _SYS_APIC_TIMER_H
  30 #define _SYS_APIC_TIMER_H
  31
  32 #ifdef  __cplusplus
  33 extern "C" {
  34 #endif
  35
  36 #include <sys/time.h>
  37
  38 #define IA32_DEADLINE_TSC_MSR   0x6E0
  39
  40 /* Timer Vector Table register  */
  41 #define APIC_LOCAL_TIMER        0xc8
  42
  43 /* timer vector table           */
  44 #define AV_PERIODIC     0x20000 /* Set timer mode to periodic */
  45 #define AV_DEADLINE     0x40000 /* Set timer mode to deadline */
  46
  47 #define APIC_TIMER_MODE_ONESHOT         0x0
  48 #define APIC_TIMER_MODE_PERIODIC        0x1
  49 #define APIC_TIMER_MODE_DEADLINE        0x2     /* TSC-Deadline timer mode */
  50
  51 extern int      apic_oneshot;
  52 extern uint_t   apic_nsec_per_intr;
  53 extern uint_t   apic_hertz_count;
  54 extern uint64_t apic_ticks_per_SFnsecs;
  55
  56 /*
  57  * Use scaled-fixed-point arithmetic to calculate apic ticks.
  58  * Round when dividing (by adding half of divisor to dividend)
  59  * for one extra bit of precision.
  60  */
  61
  62 #define SF      (1ULL<<20)              /* Scaling Factor: scale by 2^20 */
  63 #define APIC_TICKS_TO_NSECS(ticks)      ((((int64_t)(ticks) * SF) + \
  64                                         apic_ticks_per_SFnsecs / 2) / \
  65                                         apic_ticks_per_SFnsecs);
  66 #define APIC_NSECS_TO_TICKS(nsecs)      (((int64_t)(nsecs) * \
  67                                         apic_ticks_per_SFnsecs + (SF/2)) / SF)
  68
  69 extern int      apic_timer_init(int);
  70 extern void     apic_timer_reprogram(hrtime_t);
  71 extern void     apic_timer_enable(void);
  72 extern void     apic_timer_disable(void);
  73
  74 #ifdef  __cplusplus
  75 }
  76 #endif
  77
  78 #endif  /* _SYS_APIC_TIMER_H */