82 lines
1.9 KiB
C
82 lines
1.9 KiB
C
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/* 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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