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gettimeofday.h
/* 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/errno.h> #include <asm/unistd.h> #include <asm/vdso/cp15.h> #include <uapi/linux/time.h> #define VDSO_HAS_CLOCK_GETRES 1 extern struct vdso_data *__get_datapage(void); static __always_inline int gettimeofday_fallback( struct __kernel_old_timeval *_tv, struct timezone *_tz) { register struct timezone *tz asm("r1") = _tz; register struct __kernel_old_timeval *tv asm("r0") = _tv; register long ret asm ("r0"); register long nr asm("r7") = __NR_gettimeofday; asm volatile( " swi #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("r1") = _ts; register clockid_t clkid asm("r0") = _clkid; register long ret asm ("r0"); register long nr asm("r7") = __NR_clock_gettime64; asm volatile( " swi #0\n" : "=r" (ret) : "r" (clkid), "r" (ts), "r" (nr) : "memory"); return ret; } static __always_inline long clock_gettime32_fallback( clockid_t _clkid, struct old_timespec32 *_ts) { register struct old_timespec32 *ts asm("r1") = _ts; register clockid_t clkid asm("r0") = _clkid; register long ret asm ("r0"); register long nr asm("r7") = __NR_clock_gettime; asm volatile( " swi #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("r1") = _ts; register clockid_t clkid asm("r0") = _clkid; register long ret asm ("r0"); register long nr asm("r7") = __NR_clock_getres_time64; asm volatile( " swi #0\n" : "=r" (ret) : "r" (clkid), "r" (ts), "r" (nr) : "memory"); return ret; } static __always_inline int clock_getres32_fallback( clockid_t _clkid, struct old_timespec32 *_ts) { register struct old_timespec32 *ts asm("r1") = _ts; register clockid_t clkid asm("r0") = _clkid; register long ret asm ("r0"); register long nr asm("r7") = __NR_clock_getres; asm volatile( " swi #0\n" : "=r" (ret) : "r" (clkid), "r" (ts), "r" (nr) : "memory"); return ret; } static inline bool arm_vdso_hres_capable(void) { return IS_ENABLED(CONFIG_ARM_ARCH_TIMER); } #define __arch_vdso_hres_capable arm_vdso_hres_capable static __always_inline u64 __arch_get_hw_counter(int clock_mode, const struct vdso_data *vd) { #ifdef CONFIG_ARM_ARCH_TIMER u64 cycle_now; /* * 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; isb(); cycle_now = read_sysreg(CNTVCT); return cycle_now; #else /* Make GCC happy. This is compiled out anyway */ return 0; #endif } static __always_inline const struct vdso_data *__arch_get_vdso_data(void) { return __get_datapage(); } #endif /* !__ASSEMBLY__ */ #endif /* __ASM_VDSO_GETTIMEOFDAY_H */
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