2 * Copyright (c) 2017 Oracle and/or its affiliates. All rights reserved.
5 #ifndef _ASM_SPARC_VVAR_DATA_H
6 #define _ASM_SPARC_VVAR_DATA_H
8 #include <asm/clocksource.h>
9 #include <asm/processor.h>
10 #include <asm/barrier.h>
11 #include <linux/time.h>
12 #include <linux/types.h>
18 struct { /* extract of a clocksource struct */
24 /* open coded 'struct timespec' */
27 u64 monotonic_time_snsec;
28 u64 monotonic_time_sec;
29 u64 monotonic_time_coarse_sec;
30 u64 monotonic_time_coarse_nsec;
31 u64 wall_time_coarse_sec;
32 u64 wall_time_coarse_nsec;
38 extern struct vvar_data *vvar_data;
39 extern int vdso_fix_stick;
41 static inline unsigned int vvar_read_begin(const struct vvar_data *s)
46 ret = READ_ONCE(s->seq);
47 if (unlikely(ret & 1)) {
51 smp_rmb(); /* Finish all reads before we return seq */
55 static inline int vvar_read_retry(const struct vvar_data *s,
58 smp_rmb(); /* Finish all reads before checking the value of seq */
59 return unlikely(s->seq != start);
62 static inline void vvar_write_begin(struct vvar_data *s)
65 smp_wmb(); /* Makes sure that increment of seq is reflected */
68 static inline void vvar_write_end(struct vvar_data *s)
70 smp_wmb(); /* Makes the value of seq current before we increment */
75 #endif /* _ASM_SPARC_VVAR_DATA_H */