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81 lines
1.9 KiB
81 lines
1.9 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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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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#include <asm/csr.h> |
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#include <uapi/linux/time.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 __kernel_old_timeval *tv asm("a0") = _tv; |
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register struct timezone *tz asm("a1") = _tz; |
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register long ret asm("a0"); |
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register long nr asm("a7") = __NR_gettimeofday; |
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asm volatile ("ecall\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 clockid_t clkid asm("a0") = _clkid; |
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register struct __kernel_timespec *ts asm("a1") = _ts; |
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register long ret asm("a0"); |
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register long nr asm("a7") = __NR_clock_gettime; |
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asm volatile ("ecall\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 clockid_t clkid asm("a0") = _clkid; |
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register struct __kernel_timespec *ts asm("a1") = _ts; |
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register long ret asm("a0"); |
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register long nr asm("a7") = __NR_clock_getres; |
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asm volatile ("ecall\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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/* |
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* The purpose of csr_read(CSR_TIME) is to trap the system into |
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* M-mode to obtain the value of CSR_TIME. Hence, unlike other |
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* architecture, no fence instructions surround the csr_read() |
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*/ |
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return csr_read(CSR_TIME); |
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} |
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static __always_inline 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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#endif /* !__ASSEMBLY__ */ |
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#endif /* __ASM_VDSO_GETTIMEOFDAY_H */
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