arch/tile/include/asm/vdso.h

   1 /*
   2  * Copyright 2012 Tilera Corporation. All Rights Reserved.
   3  *
   4  *   This program is free software; you can redistribute it and/or
   5  *   modify it under the terms of the GNU General Public License
   6  *   as published by the Free Software Foundation, version 2.
   7  *
   8  *   This program is distributed in the hope that it will be useful, but
   9  *   WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  11  *   NON INFRINGEMENT.  See the GNU General Public License for
  12  *   more details.
  13  */
  14
  15 #ifndef __TILE_VDSO_H__
  16 #define __TILE_VDSO_H__
  17
  18 #include <linux/types.h>
  19
  20 /*
  21  * Note about the vdso_data structure:
  22  *
  23  * NEVER USE THEM IN USERSPACE CODE DIRECTLY. The layout of the
  24  * structure is supposed to be known only to the function in the vdso
  25  * itself and may change without notice.
  26  */
  27
  28 struct vdso_data {
  29         __u64 tz_update_count;  /* Timezone atomicity ctr             */
  30         __u64 tb_update_count;  /* Timebase atomicity ctr             */
  31         __u64 xtime_tod_stamp;  /* TOD clock for xtime                */
  32         __u64 xtime_clock_sec;  /* Kernel time second                 */
  33         __u64 xtime_clock_nsec; /* Kernel time nanosecond             */
  34         __u64 wtom_clock_sec;   /* Wall to monotonic clock second     */
  35         __u64 wtom_clock_nsec;  /* Wall to monotonic clock nanosecond */
  36         __u32 mult;             /* Cycle to nanosecond multiplier     */
  37         __u32 shift;            /* Cycle to nanosecond divisor (power of two) */
  38         __u32 tz_minuteswest;   /* Minutes west of Greenwich          */
  39         __u32 tz_dsttime;       /* Type of dst correction             */
  40 };
  41
  42 extern struct vdso_data *vdso_data;
  43
  44 /* __vdso_rt_sigreturn is defined with the addresses in the vdso page. */
  45 extern void __vdso_rt_sigreturn(void);
  46
  47 extern int setup_vdso_pages(void);
  48
  49 #endif /* __TILE_VDSO_H__ */