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/seqlock.h>
  19 #include <linux/types.h>
  20
  21 /*
  22  * Note about the vdso_data structure:
  23  *
  24  * NEVER USE THEM IN USERSPACE CODE DIRECTLY. The layout of the
  25  * structure is supposed to be known only to the function in the vdso
  26  * itself and may change without notice.
  27  */
  28
  29 struct vdso_data {
  30         seqcount_t tz_seq;      /* Timezone seqlock                   */
  31         seqcount_t tb_seq;      /* Timebase seqlock                   */
  32         __u64 cycle_last;       /* TOD clock for xtime                */
  33         __u64 mask;             /* Cycle mask                         */
  34         __u32 mult;             /* Cycle to nanosecond multiplier     */
  35         __u32 shift;            /* Cycle to nanosecond divisor (power of two) */
  36         __u64 wall_time_sec;
  37         __u64 wall_time_snsec;
  38         __u64 monotonic_time_sec;
  39         __u64 monotonic_time_snsec;
  40         __u64 wall_time_coarse_sec;
  41         __u64 wall_time_coarse_nsec;
  42         __u64 monotonic_time_coarse_sec;
  43         __u64 monotonic_time_coarse_nsec;
  44         __u32 tz_minuteswest;   /* Minutes west of Greenwich          */
  45         __u32 tz_dsttime;       /* Type of dst correction             */
  46 };
  47
  48 extern struct vdso_data *vdso_data;
  49
  50 /* __vdso_rt_sigreturn is defined with the addresses in the vdso page. */
  51 extern void __vdso_rt_sigreturn(void);
  52
  53 extern int setup_vdso_pages(void);
  54
  55 #endif /* __TILE_VDSO_H__ */