cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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timekeeping_internal.h (921B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2#ifndef _TIMEKEEPING_INTERNAL_H
      3#define _TIMEKEEPING_INTERNAL_H
      4
      5#include <linux/clocksource.h>
      6#include <linux/spinlock.h>
      7#include <linux/time.h>
      8
      9/*
     10 * timekeeping debug functions
     11 */
     12#ifdef CONFIG_DEBUG_FS
     13extern void tk_debug_account_sleep_time(const struct timespec64 *t);
     14#else
     15#define tk_debug_account_sleep_time(x)
     16#endif
     17
     18#ifdef CONFIG_CLOCKSOURCE_VALIDATE_LAST_CYCLE
     19static inline u64 clocksource_delta(u64 now, u64 last, u64 mask)
     20{
     21	u64 ret = (now - last) & mask;
     22
     23	/*
     24	 * Prevent time going backwards by checking the MSB of mask in
     25	 * the result. If set, return 0.
     26	 */
     27	return ret & ~(mask >> 1) ? 0 : ret;
     28}
     29#else
     30static inline u64 clocksource_delta(u64 now, u64 last, u64 mask)
     31{
     32	return (now - last) & mask;
     33}
     34#endif
     35
     36/* Semi public for serialization of non timekeeper VDSO updates. */
     37extern raw_spinlock_t timekeeper_lock;
     38
     39#endif /* _TIMEKEEPING_INTERNAL_H */