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Diffstat (limited to 'arch/x86_64/vdso/vclock_gettime.c')
-rw-r--r--arch/x86_64/vdso/vclock_gettime.c121
1 files changed, 0 insertions, 121 deletions
diff --git a/arch/x86_64/vdso/vclock_gettime.c b/arch/x86_64/vdso/vclock_gettime.c
deleted file mode 100644
index 5b54cdfb2b0..00000000000
--- a/arch/x86_64/vdso/vclock_gettime.c
+++ /dev/null
@@ -1,121 +0,0 @@
-/*
- * Copyright 2006 Andi Kleen, SUSE Labs.
- * Subject to the GNU Public License, v.2
- *
- * Fast user context implementation of clock_gettime and gettimeofday.
- *
- * The code should have no internal unresolved relocations.
- * Check with readelf after changing.
- * Also alternative() doesn't work.
- */
-
-#include <linux/kernel.h>
-#include <linux/posix-timers.h>
-#include <linux/time.h>
-#include <linux/string.h>
-#include <asm/vsyscall.h>
-#include <asm/vgtod.h>
-#include <asm/timex.h>
-#include <asm/hpet.h>
-#include <asm/unistd.h>
-#include <asm/io.h>
-#include <asm/vgtod.h>
-#include "vextern.h"
-
-#define gtod vdso_vsyscall_gtod_data
-
-static long vdso_fallback_gettime(long clock, struct timespec *ts)
-{
- long ret;
- asm("syscall" : "=a" (ret) :
- "0" (__NR_clock_gettime),"D" (clock), "S" (ts) : "memory");
- return ret;
-}
-
-static inline long vgetns(void)
-{
- long v;
- cycles_t (*vread)(void);
- vread = gtod->clock.vread;
- v = (vread() - gtod->clock.cycle_last) & gtod->clock.mask;
- return (v * gtod->clock.mult) >> gtod->clock.shift;
-}
-
-static noinline int do_realtime(struct timespec *ts)
-{
- unsigned long seq, ns;
- do {
- seq = read_seqbegin(&gtod->lock);
- ts->tv_sec = gtod->wall_time_sec;
- ts->tv_nsec = gtod->wall_time_nsec;
- ns = vgetns();
- } while (unlikely(read_seqretry(&gtod->lock, seq)));
- timespec_add_ns(ts, ns);
- return 0;
-}
-
-/* Copy of the version in kernel/time.c which we cannot directly access */
-static void vset_normalized_timespec(struct timespec *ts, long sec, long nsec)
-{
- while (nsec >= NSEC_PER_SEC) {
- nsec -= NSEC_PER_SEC;
- ++sec;
- }
- while (nsec < 0) {
- nsec += NSEC_PER_SEC;
- --sec;
- }
- ts->tv_sec = sec;
- ts->tv_nsec = nsec;
-}
-
-static noinline int do_monotonic(struct timespec *ts)
-{
- unsigned long seq, ns, secs;
- do {
- seq = read_seqbegin(&gtod->lock);
- secs = gtod->wall_time_sec;
- ns = gtod->wall_time_nsec + vgetns();
- secs += gtod->wall_to_monotonic.tv_sec;
- ns += gtod->wall_to_monotonic.tv_nsec;
- } while (unlikely(read_seqretry(&gtod->lock, seq)));
- vset_normalized_timespec(ts, secs, ns);
- return 0;
-}
-
-int __vdso_clock_gettime(clockid_t clock, struct timespec *ts)
-{
- if (likely(gtod->sysctl_enabled && gtod->clock.vread))
- switch (clock) {
- case CLOCK_REALTIME:
- return do_realtime(ts);
- case CLOCK_MONOTONIC:
- return do_monotonic(ts);
- }
- return vdso_fallback_gettime(clock, ts);
-}
-int clock_gettime(clockid_t, struct timespec *)
- __attribute__((weak, alias("__vdso_clock_gettime")));
-
-int __vdso_gettimeofday(struct timeval *tv, struct timezone *tz)
-{
- long ret;
- if (likely(gtod->sysctl_enabled && gtod->clock.vread)) {
- BUILD_BUG_ON(offsetof(struct timeval, tv_usec) !=
- offsetof(struct timespec, tv_nsec) ||
- sizeof(*tv) != sizeof(struct timespec));
- do_realtime((struct timespec *)tv);
- tv->tv_usec /= 1000;
- if (unlikely(tz != NULL)) {
- /* This relies on gcc inlining the memcpy. We'll notice
- if it ever fails to do so. */
- memcpy(tz, &gtod->sys_tz, sizeof(struct timezone));
- }
- return 0;
- }
- asm("syscall" : "=a" (ret) :
- "0" (__NR_gettimeofday), "D" (tv), "S" (tz) : "memory");
- return ret;
-}
-int gettimeofday(struct timeval *, struct timezone *)
- __attribute__((weak, alias("__vdso_gettimeofday")));