78410af511
This change adds support for clock_gettime with CLOCK_REALTIME and CLOCK_MONOTONIC using vDSO. It also updates the vdso struct nomenclature used for the clocks to match the x86 code to keep it easier to update going forward. We also support the *_COARSE clockid_t, for apps that want speed but aren't concerned about fine-grained timestamps; this saves about 20 cycles per call (see http://lwn.net/Articles/342018/). Signed-off-by: Chris Metcalf <cmetcalf@tilera.com> Acked-by: John Stultz <john.stultz@linaro.org>
56 lines
1.8 KiB
C
56 lines
1.8 KiB
C
/*
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* Copyright 2012 Tilera Corporation. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for
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* more details.
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*/
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#ifndef __TILE_VDSO_H__
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#define __TILE_VDSO_H__
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#include <linux/seqlock.h>
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#include <linux/types.h>
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/*
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* Note about the vdso_data structure:
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*
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* NEVER USE THEM IN USERSPACE CODE DIRECTLY. The layout of the
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* structure is supposed to be known only to the function in the vdso
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* itself and may change without notice.
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*/
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struct vdso_data {
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seqcount_t tz_seq; /* Timezone seqlock */
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seqcount_t tb_seq; /* Timebase seqlock */
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__u64 cycle_last; /* TOD clock for xtime */
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__u64 mask; /* Cycle mask */
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__u32 mult; /* Cycle to nanosecond multiplier */
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__u32 shift; /* Cycle to nanosecond divisor (power of two) */
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__u64 wall_time_sec;
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__u64 wall_time_snsec;
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__u64 monotonic_time_sec;
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__u64 monotonic_time_snsec;
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__u64 wall_time_coarse_sec;
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__u64 wall_time_coarse_nsec;
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__u64 monotonic_time_coarse_sec;
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__u64 monotonic_time_coarse_nsec;
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__u32 tz_minuteswest; /* Minutes west of Greenwich */
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__u32 tz_dsttime; /* Type of dst correction */
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};
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extern struct vdso_data *vdso_data;
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/* __vdso_rt_sigreturn is defined with the addresses in the vdso page. */
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extern void __vdso_rt_sigreturn(void);
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extern int setup_vdso_pages(void);
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#endif /* __TILE_VDSO_H__ */
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