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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delay.c (814B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/* Copyright Altera Corporation (C) 2014. All rights reserved.
      3 */
      4
      5#include <linux/module.h>
      6#include <asm/delay.h>
      7#include <asm/param.h>
      8#include <asm/processor.h>
      9#include <asm/timex.h>
     10
     11void __delay(unsigned long cycles)
     12{
     13	cycles_t start = get_cycles();
     14
     15	while ((get_cycles() - start) < cycles)
     16		cpu_relax();
     17}
     18EXPORT_SYMBOL(__delay);
     19
     20void __const_udelay(unsigned long xloops)
     21{
     22	u64 loops;
     23
     24	loops = (u64)xloops * loops_per_jiffy * HZ;
     25
     26	__delay(loops >> 32);
     27}
     28EXPORT_SYMBOL(__const_udelay);
     29
     30void __udelay(unsigned long usecs)
     31{
     32	__const_udelay(usecs * 0x10C7UL); /* 2**32 / 1000000 (rounded up) */
     33}
     34EXPORT_SYMBOL(__udelay);
     35
     36void __ndelay(unsigned long nsecs)
     37{
     38	__const_udelay(nsecs * 0x5UL); /* 2**32 / 1000000000 (rounded up) */
     39}
     40EXPORT_SYMBOL(__ndelay);