/* 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>
|
|
#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;
|
}
|
|
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;
|
}
|
|
#endif /* !__ASSEMBLY__ */
|
|
#endif /* __ASM_VDSO_GETTIMEOFDAY_H */
|
