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/* SPDX-License-Identifier: GPL-2.0 */ /* * Copyright (C) 2018 ARM Limited */ #ifndef __ASM_VDSO_GETTIMEOFDAY_H #define __ASM_VDSO_GETTIMEOFDAY_H #ifndef __ASSEMBLY__ #include <asm/barrier.h> #include <asm/unistd.h> #define VDSO_HAS_CLOCK_GETRES 1 static __always_inline int gettimeofday_fallback(struct __kernel_old_timeval *_tv, struct timezone *_tz) { register struct timezone *tz asm("x1") = _tz; register struct __kernel_old_timeval *tv asm("x0") = _tv; register long ret asm ("x0"); register long nr asm("x8") = __NR_gettimeofday; asm volatile( " svc #0\n" : "=r" (ret) : "r" (tv), "r" (tz), "r" (nr) : "memory"); return ret; } static __always_inline long clock_gettime_fallback(clockid_t _clkid, struct __kernel_timespec *_ts) { register struct __kernel_timespec *ts asm("x1") = _ts; register clockid_t clkid asm("x0") = _clkid; register long ret asm ("x0"); register long nr asm("x8") = __NR_clock_gettime; asm volatile( " svc #0\n" : "=r" (ret) : "r" (clkid), "r" (ts), "r" (nr) : "memory"); return ret; } static __always_inline int clock_getres_fallback(clockid_t _clkid, struct __kernel_timespec *_ts) { register struct __kernel_timespec *ts asm("x1") = _ts; register clockid_t clkid asm("x0") = _clkid; register long ret asm ("x0"); register long nr asm("x8") = __NR_clock_getres; asm volatile( " svc #0\n" : "=r" (ret) : "r" (clkid), "r" (ts), "r" (nr) : "memory"); return ret; } static __always_inline u64 __arch_get_hw_counter(s32 clock_mode, const struct vdso_data *vd) { u64 res; /* * Core checks for mode already, so this raced against a concurrent * update. Return something. Core will do another round and then * see the mode change and fallback to the syscall. */ if (clock_mode == VDSO_CLOCKMODE_NONE) return 0; /* * This isb() is required to prevent that the counter value * is speculated. */ isb(); asm volatile("mrs %0, cntvct_el0" : "=r" (res) :: "memory"); arch_counter_enforce_ordering(res); return res; } static __always_inline const struct vdso_data *__arch_get_vdso_data(void) { return _vdso_data; } #ifdef CONFIG_TIME_NS static __always_inline const struct vdso_data *__arch_get_timens_vdso_data(const struct vdso_data *vd) { return _timens_data; } #endif #endif /* !__ASSEMBLY__ */ #endif /* __ASM_VDSO_GETTIMEOFDAY_H */
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