4a556f4f56
This change creates the framework for vDSO calls, makes the existing rt_sigreturn() mechanism use it, and adds a fast gettimeofday(). Now that we need to expose the vDSO address to userspace, we add AT_SYSINFO_EHDR to the set of aux entries provided to userspace. (You can disable any extra vDSO support by booting with vdso=0, but the rt_sigreturn vDSO page will still be provided.) Note that glibc has supported the tile vDSO since release 2.17. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
49 lines
1.8 KiB
C
49 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/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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__u64 tz_update_count; /* Timezone atomicity ctr */
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__u64 tb_update_count; /* Timebase atomicity ctr */
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__u64 xtime_tod_stamp; /* TOD clock for xtime */
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__u64 xtime_clock_sec; /* Kernel time second */
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__u64 xtime_clock_nsec; /* Kernel time nanosecond */
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__u64 wtom_clock_sec; /* Wall to monotonic clock second */
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__u64 wtom_clock_nsec; /* Wall to monotonic clock nanosecond */
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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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__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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