[deliverable/linux.git] / arch / arm / include / asm / vdso_datapage.h

/*
 * Adapted from arm64 version.
 *
 * Copyright (C) 2012 ARM Limited
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#ifndef __ASM_VDSO_DATAPAGE_H
#define __ASM_VDSO_DATAPAGE_H

#ifdef __KERNEL__

#ifndef __ASSEMBLY__

#include <asm/page.h>

/* Try to be cache-friendly on systems that don't implement the
 * generic timer: fit the unconditionally updated fields in the first
 * 32 bytes.
 */
struct vdso_data {
	u32 seq_count;		/* sequence count - odd during updates */
	u16 tk_is_cntvct;	/* fall back to syscall if false */
	u16 cs_shift;		/* clocksource shift */
	u32 xtime_coarse_sec;	/* coarse time */
	u32 xtime_coarse_nsec;

	u32 wtm_clock_sec;	/* wall to monotonic offset */
	u32 wtm_clock_nsec;
	u32 xtime_clock_sec;	/* CLOCK_REALTIME - seconds */
	u32 cs_mult;		/* clocksource multiplier */

	u64 cs_cycle_last;	/* last cycle value */
	u64 cs_mask;		/* clocksource mask */

	u64 xtime_clock_snsec;	/* CLOCK_REALTIME sub-ns base */
	u32 tz_minuteswest;	/* timezone info for gettimeofday(2) */
	u32 tz_dsttime;
};

union vdso_data_store {
	struct vdso_data data;
	u8 page[PAGE_SIZE];
};

#endif /* !__ASSEMBLY__ */

#endif /* __KERNEL__ */

#endif /* __ASM_VDSO_DATAPAGE_H */
Commit	Line	Data
1713ce7c NL	1	/*
	2	* Adapted from arm64 version.
	3	*
	4	* Copyright (C) 2012 ARM Limited
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU General Public License
	16	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	17	*/
	18	#ifndef __ASM_VDSO_DATAPAGE_H
	19	#define __ASM_VDSO_DATAPAGE_H
	20
	21	#ifdef __KERNEL__
	22
	23	#ifndef __ASSEMBLY__
	24
	25	#include <asm/page.h>
	26
	27	/* Try to be cache-friendly on systems that don't implement the
	28	* generic timer: fit the unconditionally updated fields in the first
	29	* 32 bytes.
	30	*/
	31	struct vdso_data {
	32	u32 seq_count; /* sequence count - odd during updates */
	33	u16 tk_is_cntvct; /* fall back to syscall if false */
	34	u16 cs_shift; /* clocksource shift */
	35	u32 xtime_coarse_sec; /* coarse time */
	36	u32 xtime_coarse_nsec;
	37
	38	u32 wtm_clock_sec; /* wall to monotonic offset */
	39	u32 wtm_clock_nsec;
	40	u32 xtime_clock_sec; /* CLOCK_REALTIME - seconds */
	41	u32 cs_mult; /* clocksource multiplier */
	42
	43	u64 cs_cycle_last; /* last cycle value */
	44	u64 cs_mask; /* clocksource mask */
	45
	46	u64 xtime_clock_snsec; /* CLOCK_REALTIME sub-ns base */
	47	u32 tz_minuteswest; /* timezone info for gettimeofday(2) */
	48	u32 tz_dsttime;
	49	};
	50
	51	union vdso_data_store {
	52	struct vdso_data data;
	53	u8 page[PAGE_SIZE];
	54	};
	55
	56	#endif /* !__ASSEMBLY__ */
	57
	58	#endif /* __KERNEL__ */
	59
	60	#endif /* __ASM_VDSO_DATAPAGE_H */