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 #ifndef _VDSO_WTM_CLOCK_SEC_T
  28 #define _VDSO_WTM_CLOCK_SEC_T
  29 typedef u32 vdso_wtm_clock_nsec_t;
  30 #endif
  31
  32 #ifndef _VDSO_XTIME_CLOCK_SEC_T
  33 #define _VDSO_XTIME_CLOCK_SEC_T
  34 typedef u32 vdso_xtime_clock_sec_t;
  35 #endif
  36
  37 #ifndef _VDSO_RAW_TIME_SEC_T
  38 #define _VDSO_RAW_TIME_SEC_T
  39 typedef u32 vdso_raw_time_sec_t;
  40 #endif
  41
  42 /* Try to be cache-friendly on systems that don't implement the
  43  * generic timer: fit the unconditionally updated fields in the first
  44  * 32 bytes.
  45  */
  46 struct vdso_data {
  47         u32 tb_seq_count;       /* sequence count - odd during updates */
  48         u16 use_syscall;        /* fall back to syscall if true */
  49         u16 cs_shift;           /* clocksource shift */
  50         u32 xtime_coarse_sec;   /* coarse time */
  51         u32 xtime_coarse_nsec;
  52
  53         /* wall to monotonic offset */
  54         u32 wtm_clock_sec;
  55         vdso_wtm_clock_nsec_t   wtm_clock_nsec;
  56         /* CLOCK_REALTIME - seconds */
  57         vdso_xtime_clock_sec_t  xtime_clock_sec;
  58         u32 cs_mono_mult;       /* clocksource multiplier */
  59
  60         u64 cs_cycle_last;      /* last cycle value */
  61         u64 cs_mask;            /* clocksource mask */
  62
  63         u64 xtime_clock_snsec;  /* CLOCK_REALTIME sub-ns base */
  64         u32 tz_minuteswest;     /* timezone info for gettimeofday(2) */
  65         u32 tz_dsttime;
  66
  67         u64 btm_nsec;           /* monotonic to boot time */
  68         /* Raw clocksource multipler */
  69         u32 cs_raw_mult;
  70         /* Raw time */
  71         vdso_raw_time_sec_t raw_time_sec;
  72         u32 raw_time_nsec;
  73 };
  74
  75 union vdso_data_store {
  76         struct vdso_data data;
  77         u8 page[PAGE_SIZE];
  78 };
  79
  80 #endif /* !__ASSEMBLY__ */
  81
  82 #endif /* __KERNEL__ */
  83
  84 #endif /* __ASM_VDSO_DATAPAGE_H */