Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
[sfrench/cifs-2.6.git] / arch / s390 / include / asm / vdso.h
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __S390_VDSO_H__
3 #define __S390_VDSO_H__
4
5 /* Default link addresses for the vDSOs */
6 #define VDSO32_LBASE    0
7 #define VDSO64_LBASE    0
8
9 #define VDSO_VERSION_STRING     LINUX_2.6.29
10
11 #ifndef __ASSEMBLY__
12
13 /*
14  * Note about the vdso_data and vdso_per_cpu_data structures:
15  *
16  * NEVER USE THEM IN USERSPACE CODE DIRECTLY. The layout of the
17  * structure is supposed to be known only to the function in the vdso
18  * itself and may change without notice.
19  */
20
21 struct vdso_data {
22         __u64 tb_update_count;          /* Timebase atomicity ctr       0x00 */
23         __u64 xtime_tod_stamp;          /* TOD clock for xtime          0x08 */
24         __u64 xtime_clock_sec;          /* Kernel time                  0x10 */
25         __u64 xtime_clock_nsec;         /*                              0x18 */
26         __u64 xtime_coarse_sec;         /* Coarse kernel time           0x20 */
27         __u64 xtime_coarse_nsec;        /*                              0x28 */
28         __u64 wtom_clock_sec;           /* Wall to monotonic clock      0x30 */
29         __u64 wtom_clock_nsec;          /*                              0x38 */
30         __u64 wtom_coarse_sec;          /* Coarse wall to monotonic     0x40 */
31         __u64 wtom_coarse_nsec;         /*                              0x48 */
32         __u32 tz_minuteswest;           /* Minutes west of Greenwich    0x50 */
33         __u32 tz_dsttime;               /* Type of dst correction       0x54 */
34         __u32 ectg_available;           /* ECTG instruction present     0x58 */
35         __u32 tk_mult;                  /* Mult. used for xtime_nsec    0x5c */
36         __u32 tk_shift;                 /* Shift used for xtime_nsec    0x60 */
37         __u32 ts_dir;                   /* TOD steering direction       0x64 */
38         __u64 ts_end;                   /* TOD steering end             0x68 */
39 };
40
41 struct vdso_per_cpu_data {
42         __u64 ectg_timer_base;
43         __u64 ectg_user_time;
44         __u32 cpu_nr;
45         __u32 node_id;
46 };
47
48 extern struct vdso_data *vdso_data;
49
50 void vdso_alloc_boot_cpu(struct lowcore *lowcore);
51 int vdso_alloc_per_cpu(struct lowcore *lowcore);
52 void vdso_free_per_cpu(struct lowcore *lowcore);
53
54 #endif /* __ASSEMBLY__ */
55 #endif /* __S390_VDSO_H__ */