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author | Marcelo Tosatti <mtosatti@redhat.com> | 2012-11-28 01:28:51 (GMT) |
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committer | Marcelo Tosatti <mtosatti@redhat.com> | 2012-11-28 01:29:07 (GMT) |
commit | dce2db0a35197e2f4421245079f19ab753e97348 (patch) | |
tree | c3151bef0ca980cf1c1af1fa6c4585df41e5a760 /arch/x86/include/asm/pvclock.h | |
parent | 42b5637d6989f75a7a0e8ea8633583564ff443ff (diff) | |
download | linux-dce2db0a35197e2f4421245079f19ab753e97348.tar.xz |
x86: pvclock: create helper for pvclock data retrieval
Originally from Jeremy Fitzhardinge.
So code can be reused.
Acked-by: Glauber Costa <glommer@parallels.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Diffstat (limited to 'arch/x86/include/asm/pvclock.h')
-rw-r--r-- | arch/x86/include/asm/pvclock.h | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/arch/x86/include/asm/pvclock.h b/arch/x86/include/asm/pvclock.h index c59cc97..47e25d4 100644 --- a/arch/x86/include/asm/pvclock.h +++ b/arch/x86/include/asm/pvclock.h @@ -56,4 +56,32 @@ static inline u64 pvclock_scale_delta(u64 delta, u32 mul_frac, int shift) return product; } +static __always_inline +u64 pvclock_get_nsec_offset(const struct pvclock_vcpu_time_info *src) +{ + u64 delta = __native_read_tsc() - src->tsc_timestamp; + return pvclock_scale_delta(delta, src->tsc_to_system_mul, + src->tsc_shift); +} + +static __always_inline +unsigned __pvclock_read_cycles(const struct pvclock_vcpu_time_info *src, + cycle_t *cycles, u8 *flags) +{ + unsigned version; + cycle_t ret, offset; + u8 ret_flags; + + version = src->version; + rdtsc_barrier(); + offset = pvclock_get_nsec_offset(src); + ret = src->system_time + offset; + ret_flags = src->flags; + rdtsc_barrier(); + + *cycles = ret; + *flags = ret_flags; + return version; +} + #endif /* _ASM_X86_PVCLOCK_H */ |