vdso.h

Go to the documentation of this file.

#ifndef __S390_VDSO_H__
#define __S390_VDSO_H__

/* Default link addresses for the vDSOs */
#define VDSO32_LBASE    0
#define VDSO64_LBASE    0

#define VDSO_VERSION_STRING LINUX_2.6.29

#ifndef __ASSEMBLY__

/*
 * Note about the vdso_data and vdso_per_cpu_data structures:
 *
 * NEVER USE THEM IN USERSPACE CODE DIRECTLY. The layout of the
 * structure is supposed to be known only to the function in the vdso
 * itself and may change without notice.
 */

struct vdso_data {
    __u64 tb_update_count;      /* Timebase atomicity ctr   0x00 */
    __u64 xtime_tod_stamp;      /* TOD clock for xtime      0x08 */
    __u64 xtime_clock_sec;      /* Kernel time          0x10 */
    __u64 xtime_clock_nsec;     /*              0x18 */
    __u64 wtom_clock_sec;       /* Wall to monotonic clock  0x20 */
    __u64 wtom_clock_nsec;      /*              0x28 */
    __u32 tz_minuteswest;       /* Minutes west of Greenwich    0x30 */
    __u32 tz_dsttime;       /* Type of dst correction   0x34 */
    __u32 ectg_available;
    __u32 ntp_mult;         /* NTP adjusted multiplier  0x3C */
};

struct vdso_per_cpu_data {
    __u64 ectg_timer_base;
    __u64 ectg_user_time;
};

extern struct vdso_data *vdso_data;

#ifdef CONFIG_64BIT
int vdso_alloc_per_cpu(struct _lowcore *lowcore);
void vdso_free_per_cpu(struct _lowcore *lowcore);
#endif

#endif /* __ASSEMBLY__ */
#endif /* __S390_VDSO_H__ */