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75 lines
1.5 KiB
75 lines
1.5 KiB
/* |
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* Copyright (c) 2017 Oracle and/or its affiliates. All rights reserved. |
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*/ |
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#ifndef _ASM_SPARC_VVAR_DATA_H |
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#define _ASM_SPARC_VVAR_DATA_H |
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#include <asm/clocksource.h> |
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#include <asm/processor.h> |
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#include <asm/barrier.h> |
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#include <linux/time.h> |
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#include <linux/types.h> |
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struct vvar_data { |
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unsigned int seq; |
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int vclock_mode; |
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struct { /* extract of a clocksource struct */ |
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u64 cycle_last; |
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u64 mask; |
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int mult; |
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int shift; |
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} clock; |
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/* open coded 'struct timespec' */ |
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u64 wall_time_sec; |
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u64 wall_time_snsec; |
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u64 monotonic_time_snsec; |
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u64 monotonic_time_sec; |
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u64 monotonic_time_coarse_sec; |
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u64 monotonic_time_coarse_nsec; |
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u64 wall_time_coarse_sec; |
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u64 wall_time_coarse_nsec; |
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int tz_minuteswest; |
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int tz_dsttime; |
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}; |
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extern struct vvar_data *vvar_data; |
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extern int vdso_fix_stick; |
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static inline unsigned int vvar_read_begin(const struct vvar_data *s) |
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{ |
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unsigned int ret; |
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repeat: |
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ret = READ_ONCE(s->seq); |
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if (unlikely(ret & 1)) { |
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cpu_relax(); |
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goto repeat; |
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} |
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smp_rmb(); /* Finish all reads before we return seq */ |
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return ret; |
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} |
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static inline int vvar_read_retry(const struct vvar_data *s, |
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unsigned int start) |
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{ |
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smp_rmb(); /* Finish all reads before checking the value of seq */ |
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return unlikely(s->seq != start); |
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} |
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static inline void vvar_write_begin(struct vvar_data *s) |
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{ |
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++s->seq; |
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smp_wmb(); /* Makes sure that increment of seq is reflected */ |
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} |
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static inline void vvar_write_end(struct vvar_data *s) |
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{ |
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smp_wmb(); /* Makes the value of seq current before we increment */ |
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++s->seq; |
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} |
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#endif /* _ASM_SPARC_VVAR_DATA_H */
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