1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __ASM_VDSO_GETTIMEOFDAY_H
3#define __ASM_VDSO_GETTIMEOFDAY_H
4
5#ifndef __ASSEMBLY__
6
7#include <asm/barrier.h>
8#include <asm/unistd.h>
9#include <asm/csr.h>
10#include <uapi/linux/time.h>
11
12/*
13 * 32-bit land is lacking generic time vsyscalls as well as the legacy 32-bit
14 * time syscalls like gettimeofday. Skip these definitions since on 32-bit.
15 */
16#ifdef CONFIG_GENERIC_TIME_VSYSCALL
17
18#define VDSO_HAS_CLOCK_GETRES	1
19
20static __always_inline
21int gettimeofday_fallback(struct __kernel_old_timeval *_tv,
22			  struct timezone *_tz)
23{
24	register struct __kernel_old_timeval *tv asm("a0") = _tv;
25	register struct timezone *tz asm("a1") = _tz;
26	register long ret asm("a0");
27	register long nr asm("a7") = __NR_gettimeofday;
28
29	asm volatile ("ecall\n"
30		      : "=r" (ret)
31		      : "r"(tv), "r"(tz), "r"(nr)
32		      : "memory");
33
34	return ret;
35}
36
37static __always_inline
38long clock_gettime_fallback(clockid_t _clkid, struct __kernel_timespec *_ts)
39{
40	register clockid_t clkid asm("a0") = _clkid;
41	register struct __kernel_timespec *ts asm("a1") = _ts;
42	register long ret asm("a0");
43	register long nr asm("a7") = __NR_clock_gettime;
44
45	asm volatile ("ecall\n"
46		      : "=r" (ret)
47		      : "r"(clkid), "r"(ts), "r"(nr)
48		      : "memory");
49
50	return ret;
51}
52
53static __always_inline
54int clock_getres_fallback(clockid_t _clkid, struct __kernel_timespec *_ts)
55{
56	register clockid_t clkid asm("a0") = _clkid;
57	register struct __kernel_timespec *ts asm("a1") = _ts;
58	register long ret asm("a0");
59	register long nr asm("a7") = __NR_clock_getres;
60
61	asm volatile ("ecall\n"
62		      : "=r" (ret)
63		      : "r"(clkid), "r"(ts), "r"(nr)
64		      : "memory");
65
66	return ret;
67}
68
69#endif /* CONFIG_GENERIC_TIME_VSYSCALL */
70
71static __always_inline u64 __arch_get_hw_counter(s32 clock_mode,
72						 const struct vdso_data *vd)
73{
74	/*
75	 * The purpose of csr_read(CSR_TIME) is to trap the system into
76	 * M-mode to obtain the value of CSR_TIME. Hence, unlike other
77	 * architecture, no fence instructions surround the csr_read()
78	 */
79	return csr_read(CSR_TIME);
80}
81
82static __always_inline const struct vdso_data *__arch_get_vdso_data(void)
83{
84	return _vdso_data;
85}
86
87#ifdef CONFIG_TIME_NS
88static __always_inline
89const struct vdso_data *__arch_get_timens_vdso_data(const struct vdso_data *vd)
90{
91	return _timens_data;
92}
93#endif
94#endif /* !__ASSEMBLY__ */
95
96#endif /* __ASM_VDSO_GETTIMEOFDAY_H */
97