1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Author: Huacai Chen <chenhuacai@loongson.cn>
4 * Copyright (C) 2020 Loongson Technology Corporation Limited
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation;  either version 2 of the  License, or (at your
9 * option) any later version.
10 */
11#ifndef __ASM_VDSO_GETTIMEOFDAY_H
12#define __ASM_VDSO_GETTIMEOFDAY_H
13
14#ifndef __ASSEMBLY__
15
16#include <asm/barrier.h>
17#include <asm/unistd.h>
18#include <asm/vdso/vdso.h>
19
20#define VDSO_HAS_CLOCK_GETRES		1
21
22static __always_inline long gettimeofday_fallback(
23				struct __kernel_old_timeval *_tv,
24				struct timezone *_tz)
25{
26	register struct __kernel_old_timeval *tv asm("a0") = _tv;
27	register struct timezone *tz asm("a1") = _tz;
28	register long nr asm("a7") = __NR_gettimeofday;
29	register long ret asm("a0");
30
31	asm volatile(
32	"       syscall 0\n"
33	: "+r" (ret)
34	: "r" (nr), "r" (tv), "r" (tz)
35	: "$t0", "$t1", "$t2", "$t3", "$t4", "$t5", "$t6", "$t7",
36	  "$t8", "memory");
37
38	return ret;
39}
40
41static __always_inline long clock_gettime_fallback(
42					clockid_t _clkid,
43					struct __kernel_timespec *_ts)
44{
45	register clockid_t clkid asm("a0") = _clkid;
46	register struct __kernel_timespec *ts asm("a1") = _ts;
47	register long nr asm("a7") = __NR_clock_gettime;
48	register long ret asm("a0");
49
50	asm volatile(
51	"       syscall 0\n"
52	: "+r" (ret)
53	: "r" (nr), "r" (clkid), "r" (ts)
54	: "$t0", "$t1", "$t2", "$t3", "$t4", "$t5", "$t6", "$t7",
55	  "$t8", "memory");
56
57	return ret;
58}
59
60static __always_inline int clock_getres_fallback(
61					clockid_t _clkid,
62					struct __kernel_timespec *_ts)
63{
64	register clockid_t clkid asm("a0") = _clkid;
65	register struct __kernel_timespec *ts asm("a1") = _ts;
66	register long nr asm("a7") = __NR_clock_getres;
67	register long ret asm("a0");
68
69	asm volatile(
70	"       syscall 0\n"
71	: "+r" (ret)
72	: "r" (nr), "r" (clkid), "r" (ts)
73	: "$t0", "$t1", "$t2", "$t3", "$t4", "$t5", "$t6", "$t7",
74	  "$t8", "memory");
75
76	return ret;
77}
78
79static __always_inline u64 __arch_get_hw_counter(s32 clock_mode,
80						 const struct vdso_data *vd)
81{
82	uint64_t count;
83
84	__asm__ __volatile__(
85	"	rdtime.d %0, $zero\n"
86	: "=r" (count));
87
88	return count;
89}
90
91static inline bool loongarch_vdso_hres_capable(void)
92{
93	return true;
94}
95#define __arch_vdso_hres_capable loongarch_vdso_hres_capable
96
97static __always_inline const struct vdso_data *__arch_get_vdso_data(void)
98{
99	return (const struct vdso_data *)get_vdso_data();
100}
101
102#ifdef CONFIG_TIME_NS
103static __always_inline const struct vdso_data *__arch_get_timens_vdso_data(void)
104{
105	return (const struct vdso_data *)(get_vdso_data() + VVAR_TIMENS_PAGE_OFFSET * PAGE_SIZE);
106}
107#endif
108#endif /* !__ASSEMBLY__ */
109
110#endif /* __ASM_VDSO_GETTIMEOFDAY_H */
111