1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Adapted from arm64 version.
4 *
5 * Copyright (C) 2012 ARM Limited
6 */
7 #ifndef __ASM_VDSO_DATAPAGE_H
8 #define __ASM_VDSO_DATAPAGE_H
9
10 #ifdef __KERNEL__
11
12 #ifndef __ASSEMBLY__
13
14 #include <asm/page.h>
15
16 /* Try to be cache-friendly on systems that don't implement the
17 * generic timer: fit the unconditionally updated fields in the first
18 * 32 bytes.
19 */
20 struct vdso_data {
21 u32 seq_count; /* sequence count - odd during updates */
22 u16 tk_is_cntvct; /* fall back to syscall if false */
23 u16 cs_shift; /* clocksource shift */
24 u32 xtime_coarse_sec; /* coarse time */
25 u32 xtime_coarse_nsec;
26
27 u32 wtm_clock_sec; /* wall to monotonic offset */
28 u32 wtm_clock_nsec;
29 u32 xtime_clock_sec; /* CLOCK_REALTIME - seconds */
30 u32 cs_mult; /* clocksource multiplier */
31
32 u64 cs_cycle_last; /* last cycle value */
33 u64 cs_mask; /* clocksource mask */
34
35 u64 xtime_clock_snsec; /* CLOCK_REALTIME sub-ns base */
36 u32 tz_minuteswest; /* timezone info for gettimeofday(2) */
37 u32 tz_dsttime;
38 };
39
40 union vdso_data_store {
41 struct vdso_data data;
42 u8 page[PAGE_SIZE];
43 };
44
45 #endif /* !__ASSEMBLY__ */
46
47 #endif /* __KERNEL__ */
48
49 #endif /* __ASM_VDSO_DATAPAGE_H */