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 extern struct vdso_data boot_vdso_data;
  50
  51 void vdso_alloc_boot_cpu(struct lowcore *lowcore);
  52 int vdso_alloc_per_cpu(struct lowcore *lowcore);
  53 void vdso_free_per_cpu(struct lowcore *lowcore);
  54
  55 #endif /* __ASSEMBLY__ */
  56 #endif /* __S390_VDSO_H__ */