cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

delay.c (812B)

      1// SPDX-License-Identifier: GPL-2.0
      2// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
      3#include <linux/kernel.h>
      4#include <linux/module.h>
      5#include <linux/init.h>
      6#include <linux/delay.h>
      7
      8void __delay(unsigned long loops)
      9{
     10	asm volatile (
     11		"mov r0, r0\n"
     12		"1:declt %0\n"
     13		"bf	1b"
     14		: "=r"(loops)
     15		: "0"(loops));
     16}
     17EXPORT_SYMBOL(__delay);
     18
     19void __const_udelay(unsigned long xloops)
     20{
     21	unsigned long long loops;
     22
     23	loops = (unsigned long long)xloops * loops_per_jiffy * HZ;
     24
     25	__delay(loops >> 32);
     26}
     27EXPORT_SYMBOL(__const_udelay);
     28
     29void __udelay(unsigned long usecs)
     30{
     31	__const_udelay(usecs * 0x10C7UL); /* 2**32 / 1000000 (rounded up) */
     32}
     33EXPORT_SYMBOL(__udelay);
     34
     35void __ndelay(unsigned long nsecs)
     36{
     37	__const_udelay(nsecs * 0x5UL); /* 2**32 / 1000000000 (rounded up) */
     38}
     39EXPORT_SYMBOL(__ndelay);