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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 | /* 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/unistd.h> #include <uapi/linux/time.h> #define __VDSO_USE_SYSCALL ULLONG_MAX #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) { u64 res; /* * clock_mode == 0 implies that vDSO are enabled otherwise * fallback on syscall. */ if (clock_mode) return __VDSO_USE_SYSCALL; /* * This isb() is required to prevent that the counter value * is speculated. */ isb(); asm volatile("mrs %0, cntvct_el0" : "=r" (res) :: "memory"); /* * This isb() is required to prevent that the seq lock is * speculated.# */ isb(); return res; } static __always_inline const struct vdso_data *__arch_get_vdso_data(void) { return _vdso_data; } #endif /* !__ASSEMBLY__ */ #endif /* __ASM_VDSO_GETTIMEOFDAY_H */ |