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| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2008-12-25 15:38:36 +0300 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2008-12-25 15:38:55 +0300 |
| commit | b020632e40c3ed5e8c0c066d022672907e8401cf (patch) | |
| tree | d7f805bd27e8378436fbba7e7457afbd10c22ed8 /arch/s390/include/asm/vdso.h | |
| parent | fc5243d98ac2575ad14a974b3c097e9ba874c03d (diff) | |
| download | linux-b020632e40c3ed5e8c0c066d022672907e8401cf.tar.xz | |
[S390] introduce vdso on s390
Add a vdso to speed up gettimeofday and clock_getres/clock_gettime for
CLOCK_REALTIME/CLOCK_MONOTONIC.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/include/asm/vdso.h')
| -rw-r--r-- | arch/s390/include/asm/vdso.h | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/arch/s390/include/asm/vdso.h b/arch/s390/include/asm/vdso.h new file mode 100644 index 000000000000..a44f4fe16a35 --- /dev/null +++ b/arch/s390/include/asm/vdso.h @@ -0,0 +1,39 @@ +#ifndef __S390_VDSO_H__ +#define __S390_VDSO_H__ + +#ifdef __KERNEL__ + +/* Default link addresses for the vDSOs */ +#define VDSO32_LBASE 0 +#define VDSO64_LBASE 0 + +#define VDSO_VERSION_STRING LINUX_2.6.26 + +#ifndef __ASSEMBLY__ + +/* + * Note about this structure: + * + * NEVER USE THIS IN USERSPACE CODE DIRECTLY. The layout of this + * 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 */ +}; + +extern struct vdso_data *vdso_data; + +#endif /* __ASSEMBLY__ */ + +#endif /* __KERNEL__ */ + +#endif /* __S390_VDSO_H__ */ |