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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time.h (1085B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2/*
      3 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
      4 */
      5#ifndef _ASM_TIME_H
      6#define _ASM_TIME_H
      7
      8#include <linux/clockchips.h>
      9#include <linux/clocksource.h>
     10#include <asm/loongarch.h>
     11
     12extern u64 cpu_clock_freq;
     13extern u64 const_clock_freq;
     14
     15extern void sync_counter(void);
     16
     17static inline unsigned int calc_const_freq(void)
     18{
     19	unsigned int res;
     20	unsigned int base_freq;
     21	unsigned int cfm, cfd;
     22
     23	res = read_cpucfg(LOONGARCH_CPUCFG2);
     24	if (!(res & CPUCFG2_LLFTP))
     25		return 0;
     26
     27	base_freq = read_cpucfg(LOONGARCH_CPUCFG4);
     28	res = read_cpucfg(LOONGARCH_CPUCFG5);
     29	cfm = res & 0xffff;
     30	cfd = (res >> 16) & 0xffff;
     31
     32	if (!base_freq || !cfm || !cfd)
     33		return 0;
     34
     35	return (base_freq * cfm / cfd);
     36}
     37
     38/*
     39 * Initialize the calling CPU's timer interrupt as clockevent device
     40 */
     41extern int constant_clockevent_init(void);
     42extern int constant_clocksource_init(void);
     43
     44static inline void clockevent_set_clock(struct clock_event_device *cd,
     45					unsigned int clock)
     46{
     47	clockevents_calc_mult_shift(cd, clock, 4);
     48}
     49
     50#endif /* _ASM_TIME_H */