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Linux kernel mirror (for testing)
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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
21struct 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 __u32 hrtimer_res; /* hrtimer resolution 0x70 */
40};
41
42struct vdso_per_cpu_data {
43 __u64 ectg_timer_base;
44 __u64 ectg_user_time;
45 /*
46 * Note: node_id and cpu_nr must be at adjacent memory locations.
47 * VDSO userspace must read both values with a single instruction.
48 */
49 union {
50 __u64 getcpu_val;
51 struct {
52 __u32 node_id;
53 __u32 cpu_nr;
54 };
55 };
56};
57
58extern struct vdso_data *vdso_data;
59extern struct vdso_data boot_vdso_data;
60
61void vdso_alloc_boot_cpu(struct lowcore *lowcore);
62int vdso_alloc_per_cpu(struct lowcore *lowcore);
63void vdso_free_per_cpu(struct lowcore *lowcore);
64
65#endif /* __ASSEMBLY__ */
66#endif /* __S390_VDSO_H__ */