arch/arm/include/asm/vdso_datapage.h

   1 /*
   2  * Adapted from arm64 version.
   3  *
   4  * Copyright (C) 2012 ARM Limited
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18 #ifndef __ASM_VDSO_DATAPAGE_H
  19 #define __ASM_VDSO_DATAPAGE_H
  20
  21 #ifdef __KERNEL__
  22
  23 #ifndef __ASSEMBLY__
  24
  25 #include <asm/page.h>
  26
  27 /* Try to be cache-friendly on systems that don't implement the
  28  * generic timer: fit the unconditionally updated fields in the first
  29  * 32 bytes.
  30  */
  31 struct vdso_data {
  32         u32 seq_count;          /* sequence count - odd during updates */
  33         u16 tk_is_cntvct;       /* fall back to syscall if false */
  34         u16 cs_shift;           /* clocksource shift */
  35         u32 xtime_coarse_sec;   /* coarse time */
  36         u32 xtime_coarse_nsec;
  37
  38         u32 wtm_clock_sec;      /* wall to monotonic offset */
  39         u32 wtm_clock_nsec;
  40         u32 xtime_clock_sec;    /* CLOCK_REALTIME - seconds */
  41         u32 cs_mult;            /* clocksource multiplier */
  42
  43         u64 cs_cycle_last;      /* last cycle value */
  44         u64 cs_mask;            /* clocksource mask */
  45
  46         u64 xtime_clock_snsec;  /* CLOCK_REALTIME sub-ns base */
  47         u32 tz_minuteswest;     /* timezone info for gettimeofday(2) */
  48         u32 tz_dsttime;
  49 };
  50
  51 union vdso_data_store {
  52         struct vdso_data data;
  53         u8 page[PAGE_SIZE];
  54 };
  55
  56 #endif /* !__ASSEMBLY__ */
  57
  58 #endif /* __KERNEL__ */
  59
  60 #endif /* __ASM_VDSO_DATAPAGE_H */