xref: /openbmc/linux/arch/s390/include/asm/vdso.h (revision 0edbfea5)
1 #ifndef __S390_VDSO_H__
2 #define __S390_VDSO_H__
3 
4 /* Default link addresses for the vDSOs */
5 #define VDSO32_LBASE	0
6 #define VDSO64_LBASE	0
7 
8 #define VDSO_VERSION_STRING	LINUX_2.6.29
9 
10 #ifndef __ASSEMBLY__
11 
12 /*
13  * Note about the vdso_data and vdso_per_cpu_data structures:
14  *
15  * NEVER USE THEM IN USERSPACE CODE DIRECTLY. The layout of the
16  * structure is supposed to be known only to the function in the vdso
17  * itself and may change without notice.
18  */
19 
20 struct vdso_data {
21 	__u64 tb_update_count;		/* Timebase atomicity ctr	0x00 */
22 	__u64 xtime_tod_stamp;		/* TOD clock for xtime		0x08 */
23 	__u64 xtime_clock_sec;		/* Kernel time			0x10 */
24 	__u64 xtime_clock_nsec;		/*				0x18 */
25 	__u64 xtime_coarse_sec;		/* Coarse kernel time		0x20 */
26 	__u64 xtime_coarse_nsec;	/*				0x28 */
27 	__u64 wtom_clock_sec;		/* Wall to monotonic clock	0x30 */
28 	__u64 wtom_clock_nsec;		/*				0x38 */
29 	__u64 wtom_coarse_sec;		/* Coarse wall to monotonic	0x40 */
30 	__u64 wtom_coarse_nsec;		/*				0x48 */
31 	__u32 tz_minuteswest;		/* Minutes west of Greenwich	0x50 */
32 	__u32 tz_dsttime;		/* Type of dst correction	0x54 */
33 	__u32 ectg_available;		/* ECTG instruction present	0x58 */
34 	__u32 tk_mult;			/* Mult. used for xtime_nsec	0x5c */
35 	__u32 tk_shift;			/* Shift used for xtime_nsec	0x60 */
36 };
37 
38 struct vdso_per_cpu_data {
39 	__u64 ectg_timer_base;
40 	__u64 ectg_user_time;
41 	__u32 cpu_nr;
42 	__u32 node_id;
43 };
44 
45 extern struct vdso_data *vdso_data;
46 
47 int vdso_alloc_per_cpu(struct lowcore *lowcore);
48 void vdso_free_per_cpu(struct lowcore *lowcore);
49 
50 #endif /* __ASSEMBLY__ */
51 #endif /* __S390_VDSO_H__ */
52