diff options
Diffstat (limited to 'arch/x86_64/vdso/vclock_gettime.c')
-rw-r--r-- | arch/x86_64/vdso/vclock_gettime.c | 121 |
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 5b54cdfb2b07..000000000000 --- 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(>od->lock); - ts->tv_sec = gtod->wall_time_sec; - ts->tv_nsec = gtod->wall_time_nsec; - ns = vgetns(); - } while (unlikely(read_seqretry(>od->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(>od->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(>od->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, >od->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"))); |