1/*
 2 * Copyright 2012 Tilera Corporation. All Rights Reserved.
 3 *
 4 *   This program is free software; you can redistribute it and/or
 5 *   modify it under the terms of the GNU General Public License
 6 *   as published by the Free Software Foundation, version 2.
 7 *
 8 *   This program is distributed in the hope that it will be useful, but
 9 *   WITHOUT ANY WARRANTY; without even the implied warranty of
10 *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
11 *   NON INFRINGEMENT.  See the GNU General Public License for
12 *   more details.
13 */
14
15#ifndef __TILE_VDSO_H__
16#define __TILE_VDSO_H__
17
18#include <linux/seqlock.h>
19#include <linux/types.h>
20
21/*
22 * Note about the vdso_data structure:
23 *
24 * NEVER USE THEM IN USERSPACE CODE DIRECTLY. The layout of the
25 * structure is supposed to be known only to the function in the vdso
26 * itself and may change without notice.
27 */
28
29struct vdso_data {
30	seqcount_t tz_seq;	/* Timezone seqlock                   */
31	seqcount_t tb_seq;	/* Timebase seqlock                   */
32	__u64 cycle_last;       /* TOD clock for xtime                */
33	__u64 mask;             /* Cycle mask                         */
34	__u32 mult;             /* Cycle to nanosecond multiplier     */
35	__u32 shift;            /* Cycle to nanosecond divisor (power of two) */
36	__u64 wall_time_sec;
37	__u64 wall_time_snsec;
38	__u64 monotonic_time_sec;
39	__u64 monotonic_time_snsec;
40	__u64 wall_time_coarse_sec;
41	__u64 wall_time_coarse_nsec;
42	__u64 monotonic_time_coarse_sec;
43	__u64 monotonic_time_coarse_nsec;
44	__u32 tz_minuteswest;   /* Minutes west of Greenwich          */
45	__u32 tz_dsttime;       /* Type of dst correction             */
46};
47
48extern struct vdso_data *vdso_data;
49
50/* __vdso_rt_sigreturn is defined with the addresses in the vdso page. */
51extern void __vdso_rt_sigreturn(void);
52
53extern int setup_vdso_pages(void);
54
55#endif /* __TILE_VDSO_H__ */