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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gettimeofday.h (2288B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2/*
      3 * Author: Huacai Chen <chenhuacai@loongson.cn>
      4 *
      5 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
      6 */
      7#ifndef __ASM_VDSO_GETTIMEOFDAY_H
      8#define __ASM_VDSO_GETTIMEOFDAY_H
      9
     10#ifndef __ASSEMBLY__
     11
     12#include <asm/unistd.h>
     13#include <asm/vdso/vdso.h>
     14
     15#define VDSO_HAS_CLOCK_GETRES		1
     16
     17static __always_inline long gettimeofday_fallback(
     18				struct __kernel_old_timeval *_tv,
     19				struct timezone *_tz)
     20{
     21	register struct __kernel_old_timeval *tv asm("a0") = _tv;
     22	register struct timezone *tz asm("a1") = _tz;
     23	register long nr asm("a7") = __NR_gettimeofday;
     24	register long ret asm("a0");
     25
     26	asm volatile(
     27	"       syscall 0\n"
     28	: "+r" (ret)
     29	: "r" (nr), "r" (tv), "r" (tz)
     30	: "$t0", "$t1", "$t2", "$t3", "$t4", "$t5", "$t6", "$t7",
     31	  "$t8", "memory");
     32
     33	return ret;
     34}
     35
     36static __always_inline long clock_gettime_fallback(
     37					clockid_t _clkid,
     38					struct __kernel_timespec *_ts)
     39{
     40	register clockid_t clkid asm("a0") = _clkid;
     41	register struct __kernel_timespec *ts asm("a1") = _ts;
     42	register long nr asm("a7") = __NR_clock_gettime;
     43	register long ret asm("a0");
     44
     45	asm volatile(
     46	"       syscall 0\n"
     47	: "+r" (ret)
     48	: "r" (nr), "r" (clkid), "r" (ts)
     49	: "$t0", "$t1", "$t2", "$t3", "$t4", "$t5", "$t6", "$t7",
     50	  "$t8", "memory");
     51
     52	return ret;
     53}
     54
     55static __always_inline int clock_getres_fallback(
     56					clockid_t _clkid,
     57					struct __kernel_timespec *_ts)
     58{
     59	register clockid_t clkid asm("a0") = _clkid;
     60	register struct __kernel_timespec *ts asm("a1") = _ts;
     61	register long nr asm("a7") = __NR_clock_getres;
     62	register long ret asm("a0");
     63
     64	asm volatile(
     65	"       syscall 0\n"
     66	: "+r" (ret)
     67	: "r" (nr), "r" (clkid), "r" (ts)
     68	: "$t0", "$t1", "$t2", "$t3", "$t4", "$t5", "$t6", "$t7",
     69	  "$t8", "memory");
     70
     71	return ret;
     72}
     73
     74static __always_inline u64 __arch_get_hw_counter(s32 clock_mode,
     75						 const struct vdso_data *vd)
     76{
     77	uint64_t count;
     78
     79	__asm__ __volatile__(
     80	"	rdtime.d %0, $zero\n"
     81	: "=r" (count));
     82
     83	return count;
     84}
     85
     86static inline bool loongarch_vdso_hres_capable(void)
     87{
     88	return true;
     89}
     90#define __arch_vdso_hres_capable loongarch_vdso_hres_capable
     91
     92static __always_inline const struct vdso_data *__arch_get_vdso_data(void)
     93{
     94	return get_vdso_data();
     95}
     96
     97#endif /* !__ASSEMBLY__ */
     98
     99#endif /* __ASM_VDSO_GETTIMEOFDAY_H */