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authorSrikant Patnaik2015-01-11 12:28:04 +0530
committerSrikant Patnaik2015-01-11 12:28:04 +0530
commit871480933a1c28f8a9fed4c4d34d06c439a7a422 (patch)
tree8718f573808810c2a1e8cb8fb6ac469093ca2784 /ANDROID_3.4.5/arch/x86/kernel/pvclock.c
parent9d40ac5867b9aefe0722bc1f110b965ff294d30d (diff)
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Moved, renamed, and deleted files
The original directory structure was scattered and unorganized. Changes are basically to make it look like kernel structure.
Diffstat (limited to 'ANDROID_3.4.5/arch/x86/kernel/pvclock.c')
-rw-r--r--ANDROID_3.4.5/arch/x86/kernel/pvclock.c158
1 files changed, 0 insertions, 158 deletions
diff --git a/ANDROID_3.4.5/arch/x86/kernel/pvclock.c b/ANDROID_3.4.5/arch/x86/kernel/pvclock.c
deleted file mode 100644
index 42eb3300..00000000
--- a/ANDROID_3.4.5/arch/x86/kernel/pvclock.c
+++ /dev/null
@@ -1,158 +0,0 @@
-/* paravirtual clock -- common code used by kvm/xen
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
-*/
-
-#include <linux/kernel.h>
-#include <linux/percpu.h>
-#include <asm/pvclock.h>
-
-/*
- * These are perodically updated
- * xen: magic shared_info page
- * kvm: gpa registered via msr
- * and then copied here.
- */
-struct pvclock_shadow_time {
- u64 tsc_timestamp; /* TSC at last update of time vals. */
- u64 system_timestamp; /* Time, in nanosecs, since boot. */
- u32 tsc_to_nsec_mul;
- int tsc_shift;
- u32 version;
- u8 flags;
-};
-
-static u8 valid_flags __read_mostly = 0;
-
-void pvclock_set_flags(u8 flags)
-{
- valid_flags = flags;
-}
-
-static u64 pvclock_get_nsec_offset(struct pvclock_shadow_time *shadow)
-{
- u64 delta = native_read_tsc() - shadow->tsc_timestamp;
- return pvclock_scale_delta(delta, shadow->tsc_to_nsec_mul,
- shadow->tsc_shift);
-}
-
-/*
- * Reads a consistent set of time-base values from hypervisor,
- * into a shadow data area.
- */
-static unsigned pvclock_get_time_values(struct pvclock_shadow_time *dst,
- struct pvclock_vcpu_time_info *src)
-{
- do {
- dst->version = src->version;
- rmb(); /* fetch version before data */
- dst->tsc_timestamp = src->tsc_timestamp;
- dst->system_timestamp = src->system_time;
- dst->tsc_to_nsec_mul = src->tsc_to_system_mul;
- dst->tsc_shift = src->tsc_shift;
- dst->flags = src->flags;
- rmb(); /* test version after fetching data */
- } while ((src->version & 1) || (dst->version != src->version));
-
- return dst->version;
-}
-
-unsigned long pvclock_tsc_khz(struct pvclock_vcpu_time_info *src)
-{
- u64 pv_tsc_khz = 1000000ULL << 32;
-
- do_div(pv_tsc_khz, src->tsc_to_system_mul);
- if (src->tsc_shift < 0)
- pv_tsc_khz <<= -src->tsc_shift;
- else
- pv_tsc_khz >>= src->tsc_shift;
- return pv_tsc_khz;
-}
-
-static atomic64_t last_value = ATOMIC64_INIT(0);
-
-void pvclock_resume(void)
-{
- atomic64_set(&last_value, 0);
-}
-
-cycle_t pvclock_clocksource_read(struct pvclock_vcpu_time_info *src)
-{
- struct pvclock_shadow_time shadow;
- unsigned version;
- cycle_t ret, offset;
- u64 last;
-
- do {
- version = pvclock_get_time_values(&shadow, src);
- barrier();
- offset = pvclock_get_nsec_offset(&shadow);
- ret = shadow.system_timestamp + offset;
- barrier();
- } while (version != src->version);
-
- if ((valid_flags & PVCLOCK_TSC_STABLE_BIT) &&
- (shadow.flags & PVCLOCK_TSC_STABLE_BIT))
- return ret;
-
- /*
- * Assumption here is that last_value, a global accumulator, always goes
- * forward. If we are less than that, we should not be much smaller.
- * We assume there is an error marging we're inside, and then the correction
- * does not sacrifice accuracy.
- *
- * For reads: global may have changed between test and return,
- * but this means someone else updated poked the clock at a later time.
- * We just need to make sure we are not seeing a backwards event.
- *
- * For updates: last_value = ret is not enough, since two vcpus could be
- * updating at the same time, and one of them could be slightly behind,
- * making the assumption that last_value always go forward fail to hold.
- */
- last = atomic64_read(&last_value);
- do {
- if (ret < last)
- return last;
- last = atomic64_cmpxchg(&last_value, last, ret);
- } while (unlikely(last != ret));
-
- return ret;
-}
-
-void pvclock_read_wallclock(struct pvclock_wall_clock *wall_clock,
- struct pvclock_vcpu_time_info *vcpu_time,
- struct timespec *ts)
-{
- u32 version;
- u64 delta;
- struct timespec now;
-
- /* get wallclock at system boot */
- do {
- version = wall_clock->version;
- rmb(); /* fetch version before time */
- now.tv_sec = wall_clock->sec;
- now.tv_nsec = wall_clock->nsec;
- rmb(); /* fetch time before checking version */
- } while ((wall_clock->version & 1) || (version != wall_clock->version));
-
- delta = pvclock_clocksource_read(vcpu_time); /* time since system boot */
- delta += now.tv_sec * (u64)NSEC_PER_SEC + now.tv_nsec;
-
- now.tv_nsec = do_div(delta, NSEC_PER_SEC);
- now.tv_sec = delta;
-
- set_normalized_timespec(ts, now.tv_sec, now.tv_nsec);
-}