--- old/usr/src/uts/i86pc/sys/comm_page.h
          +++ new/usr/src/uts/i86pc/sys/comm_page.h

   1    1  /*
   2    2   * This file and its contents are supplied under the terms of the
   3    3   * Common Development and Distribution License ("CDDL"), version 1.0.
   4    4   * You may only use this file in accordance with the terms of version
   5    5   * 1.0 of the CDDL.
   6    6   *
   7    7   * A full copy of the text of the CDDL should have accompanied this
   8    8   * source.  A copy of the CDDL is also available via the Internet at
   9    9   * http://www.illumos.org/license/CDDL.
  10   10   */
  11   11  
  12   12  /*
  13   13   * Copyright 2016 Joyent, Inc.
  14   14   */
  15   15  
  16   16  #ifndef _COMM_PAGE_H
  17   17  #define _COMM_PAGE_H
  18   18  
  19   19  #ifndef _ASM
  20   20  #include <sys/types.h>
  21   21  #include <sys/param.h>
  22   22  #include <sys/time.h>
  23   23  #endif /* _ASM */
  24   24  
  25   25  #ifdef __cplusplus
  26   26  extern "C" {
  27   27  #endif
  28   28  
  29   29  #define COMM_PAGE_SIZE  PAGESIZE
  30   30  #define COMM_PAGE_ALIGN 0x4000
  31   31  
  32   32  #ifndef _ASM
  33   33  
  34   34  /*
  35   35   * x86 comm page
  36   36   *
  37   37   * This struct defines the data format for the "comm page": kernel data made
  38   38   * directly available to userspace for read-only operations.  This enables
  39   39   * facilities such as clock_gettime to operate entirely in userspace without
  40   40   * the need for a trap or fasttrap.
  41   41   *
  42   42   * A note about 32-bit/64-bit compatibility:
  43   43   * The current format of the comm page is designed to be consistent for both
  44   44   * 32-bit and 64-bit programs running in a 64-bit kernel.  On 32-bit kernels,
  45   45   * the comm page is not exposed to userspace due to the difference in
  46   46   * timespec_t sizing.
  47   47   *
  48   48   * This struct is instantiated "by hand" in assembly to preserve the global
  49   49   * symbols it contains.  That layout must be kept in sync with the structure
  50   50   * defined here.
  51   51   * See: "uts/i86pc/ml/comm_page.s"
  52   52   */
  53   53  typedef struct comm_page_s {
  54   54          hrtime_t                cp_tsc_last;
  55   55          hrtime_t                cp_tsc_hrtime_base;
  56   56          hrtime_t                cp_tsc_resume_cap;
  57   57          uint32_t                cp_tsc_type;
  58   58          uint32_t                cp_tsc_max_delta;
  59   59  
  60   60          volatile uint32_t       cp_hres_lock;   /* must be 8-byte aligned */
  61   61          uint32_t                cp_nsec_scale;
  62   62          int64_t                 cp_hrestime_adj;
  63   63          hrtime_t                cp_hres_last_tick;
  64   64          uint32_t                cp_tsc_ncpu;
  65   65          uint32_t                _cp_pad;
  66   66          volatile int64_t        cp_hrestime[2];
  67   67  #if defined(_MACHDEP)
  68   68          hrtime_t                cp_tsc_sync_tick_delta[NCPU];
  69   69  #else
  70   70          /* length resides in cp_ncpu */
  71   71          hrtime_t                cp_tsc_sync_tick_delta[];
  72   72  #endif /* defined(_MACHDEP) */
  73   73  } comm_page_t;
  74   74  
  75   75  #if defined(_KERNEL)
  76   76  extern comm_page_t comm_page;
  77   77  
  78   78  #if defined(_MACHDEP)
  79   79  extern hrtime_t tsc_last;
  80   80  extern hrtime_t tsc_hrtime_base;
  81   81  extern hrtime_t tsc_resume_cap;
  82   82  extern uint32_t tsc_type;
  83   83  extern uint32_t tsc_max_delta;
  84   84  extern volatile uint32_t hres_lock;
  85   85  extern uint32_t nsec_scale;
  86   86  extern int64_t hrestime_adj;
  87   87  extern hrtime_t hres_last_tick;
  88   88  extern uint32_t tsc_ncpu;
  89   89  extern volatile timestruc_t hrestime;
  90   90  extern hrtime_t tsc_sync_tick_delta[NCPU];
  91   91  #endif /* defined(_MACHDEP) */
  92   92  #endif /* defined(_KERNEL) */
  93   93  
  94   94  #endif  /* _ASM */
  95   95  
  96   96  #ifdef __cplusplus
  97   97  }
  98   98  #endif
  99   99  
 100  100  #endif /* _COMM_PAGE_H */

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