arch/s390/include/asm/vdso.h

   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 wtom_clock_sec;           /* Wall to monotonic clock      0x20 */
  26         __u64 wtom_clock_nsec;          /*                              0x28 */
  27         __u32 tz_minuteswest;           /* Minutes west of Greenwich    0x30 */
  28         __u32 tz_dsttime;               /* Type of dst correction       0x34 */
  29         __u32 ectg_available;           /* ECTG instruction present     0x38 */
  30         __u32 tk_mult;                  /* Mult. used for xtime_nsec    0x3c */
  31         __u32 tk_shift;                 /* Shift used for xtime_nsec    0x40 */
  32 };
  33
  34 struct vdso_per_cpu_data {
  35         __u64 ectg_timer_base;
  36         __u64 ectg_user_time;
  37 };
  38
  39 extern struct vdso_data *vdso_data;
  40
  41 #ifdef CONFIG_64BIT
  42 int vdso_alloc_per_cpu(struct _lowcore *lowcore);
  43 void vdso_free_per_cpu(struct _lowcore *lowcore);
  44 #endif
  45
  46 #endif /* __ASSEMBLY__ */
  47 #endif /* __S390_VDSO_H__ */