diff options
| author | Glauber Costa <gcosta@redhat.com> | 2008-07-28 11:47:52 -0300 |
|---|---|---|
| committer | Avi Kivity <avi@qumranet.com> | 2008-10-15 10:15:17 +0200 |
| commit | 3807f345b2c610336c17c7624a0d496a38df75a0 (patch) | |
| tree | 63142e06c85b938ddd6f1b0ced11724f362d6d5d /arch | |
| parent | 3cf57fed216e2c1b6fdfeccb792650bab72a350a (diff) | |
x86: paravirt: factor out cpu_khz to common code
KVM intends to use paravirt code to calibrate khz. Xen
current code will do just fine. So as a first step, factor out
code to pvclock.c.
Signed-off-by: Glauber Costa <gcosta@redhat.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/pvclock.c | 12 | ||||
| -rw-r--r-- | arch/x86/xen/time.c | 11 |
2 files changed, 14 insertions, 9 deletions
diff --git a/arch/x86/kernel/pvclock.c b/arch/x86/kernel/pvclock.c index 05fbe9a0325..1c54b5fb7ae 100644 --- a/arch/x86/kernel/pvclock.c +++ b/arch/x86/kernel/pvclock.c @@ -97,6 +97,18 @@ static unsigned pvclock_get_time_values(struct pvclock_shadow_time *dst, return dst->version; } +unsigned long pvclock_tsc_khz(struct pvclock_vcpu_time_info *src) +{ + u64 tsc_khz = 1000000ULL << 32; + + do_div(tsc_khz, src->tsc_to_system_mul); + if (src->tsc_shift < 0) + tsc_khz <<= -src->tsc_shift; + else + tsc_khz >>= src->tsc_shift; + return tsc_khz; +} + cycle_t pvclock_clocksource_read(struct pvclock_vcpu_time_info *src) { struct pvclock_shadow_time shadow; diff --git a/arch/x86/xen/time.c b/arch/x86/xen/time.c index 004ba86326a..c9f7cda48ed 100644 --- a/arch/x86/xen/time.c +++ b/arch/x86/xen/time.c @@ -198,17 +198,10 @@ unsigned long long xen_sched_clock(void) /* Get the TSC speed from Xen */ unsigned long xen_tsc_khz(void) { - u64 xen_khz = 1000000ULL << 32; - const struct pvclock_vcpu_time_info *info = + struct pvclock_vcpu_time_info *info = &HYPERVISOR_shared_info->vcpu_info[0].time; - do_div(xen_khz, info->tsc_to_system_mul); - if (info->tsc_shift < 0) - xen_khz <<= -info->tsc_shift; - else - xen_khz >>= info->tsc_shift; - - return xen_khz; + return pvclock_tsc_khz(info); } cycle_t xen_clocksource_read(void) |