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