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 (2153B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2#ifndef __ASM_VDSO_GETTIMEOFDAY_H
      3#define __ASM_VDSO_GETTIMEOFDAY_H
      4
      5#ifndef __ASSEMBLY__
      6
      7#include <asm/barrier.h>
      8#include <asm/unistd.h>
      9#include <asm/csr.h>
     10#include <uapi/linux/time.h>
     11
     12#define VDSO_HAS_CLOCK_GETRES	1
     13
     14static __always_inline
     15int gettimeofday_fallback(struct __kernel_old_timeval *_tv,
     16			  struct timezone *_tz)
     17{
     18	register struct __kernel_old_timeval *tv asm("a0") = _tv;
     19	register struct timezone *tz asm("a1") = _tz;
     20	register long ret asm("a0");
     21	register long nr asm("a7") = __NR_gettimeofday;
     22
     23	asm volatile ("ecall\n"
     24		      : "=r" (ret)
     25		      : "r"(tv), "r"(tz), "r"(nr)
     26		      : "memory");
     27
     28	return ret;
     29}
     30
     31static __always_inline
     32long clock_gettime_fallback(clockid_t _clkid, struct __kernel_timespec *_ts)
     33{
     34	register clockid_t clkid asm("a0") = _clkid;
     35	register struct __kernel_timespec *ts asm("a1") = _ts;
     36	register long ret asm("a0");
     37	register long nr asm("a7") = __NR_clock_gettime;
     38
     39	asm volatile ("ecall\n"
     40		      : "=r" (ret)
     41		      : "r"(clkid), "r"(ts), "r"(nr)
     42		      : "memory");
     43
     44	return ret;
     45}
     46
     47static __always_inline
     48int clock_getres_fallback(clockid_t _clkid, struct __kernel_timespec *_ts)
     49{
     50	register clockid_t clkid asm("a0") = _clkid;
     51	register struct __kernel_timespec *ts asm("a1") = _ts;
     52	register long ret asm("a0");
     53	register long nr asm("a7") = __NR_clock_getres;
     54
     55	asm volatile ("ecall\n"
     56		      : "=r" (ret)
     57		      : "r"(clkid), "r"(ts), "r"(nr)
     58		      : "memory");
     59
     60	return ret;
     61}
     62
     63static __always_inline u64 __arch_get_hw_counter(s32 clock_mode,
     64						 const struct vdso_data *vd)
     65{
     66	/*
     67	 * The purpose of csr_read(CSR_TIME) is to trap the system into
     68	 * M-mode to obtain the value of CSR_TIME. Hence, unlike other
     69	 * architecture, no fence instructions surround the csr_read()
     70	 */
     71	return csr_read(CSR_TIME);
     72}
     73
     74static __always_inline const struct vdso_data *__arch_get_vdso_data(void)
     75{
     76	return _vdso_data;
     77}
     78
     79#ifdef CONFIG_TIME_NS
     80static __always_inline
     81const struct vdso_data *__arch_get_timens_vdso_data(const struct vdso_data *vd)
     82{
     83	return _timens_data;
     84}
     85#endif
     86#endif /* !__ASSEMBLY__ */
     87
     88#endif /* __ASM_VDSO_GETTIMEOFDAY_H */