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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ASM_VDSO_GETTIMEOFDAY_H
#define __ASM_VDSO_GETTIMEOFDAY_H
#ifndef __ASSEMBLY__
#include <asm/barrier.h>
#include <asm/unistd.h>
#include <asm/csr.h>
#include <uapi/linux/time.h>
/*
* 32-bit land is lacking generic time vsyscalls as well as the legacy 32-bit
* time syscalls like gettimeofday. Skip these definitions since on 32-bit.
*/
#ifdef CONFIG_GENERIC_TIME_VSYSCALL
#define VDSO_HAS_CLOCK_GETRES 1
static __always_inline
int gettimeofday_fallback(struct __kernel_old_timeval *_tv,
struct timezone *_tz)
{
register struct __kernel_old_timeval *tv asm("a0") = _tv;
register struct timezone *tz asm("a1") = _tz;
register long ret asm("a0");
register long nr asm("a7") = __NR_gettimeofday;
asm volatile ("ecall\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 clockid_t clkid asm("a0") = _clkid;
register struct __kernel_timespec *ts asm("a1") = _ts;
register long ret asm("a0");
register long nr asm("a7") = __NR_clock_gettime;
asm volatile ("ecall\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 clockid_t clkid asm("a0") = _clkid;
register struct __kernel_timespec *ts asm("a1") = _ts;
register long ret asm("a0");
register long nr asm("a7") = __NR_clock_getres;
asm volatile ("ecall\n"
: "=r" (ret)
: "r"(clkid), "r"(ts), "r"(nr)
: "memory");
return ret;
}
#endif /* CONFIG_GENERIC_TIME_VSYSCALL */
static __always_inline u64 __arch_get_hw_counter(s32 clock_mode,
const struct vdso_data *vd)
{
/*
* The purpose of csr_read(CSR_TIME) is to trap the system into
* M-mode to obtain the value of CSR_TIME. Hence, unlike other
* architecture, no fence instructions surround the csr_read()
*/
return csr_read(CSR_TIME);
}
static __always_inline const struct vdso_data *__arch_get_vdso_data(void)
{
return _vdso_data;
}
#ifdef CONFIG_TIME_NS
static __always_inline
const struct vdso_data *__arch_get_timens_vdso_data(const struct vdso_data *vd)
{
return _timens_data;
}
#endif
#endif /* !__ASSEMBLY__ */
#endif /* __ASM_VDSO_GETTIMEOFDAY_H */