gettimeofday.h

 1/* SPDX-License-Identifier: GPL-2.0 */
 2/*
 3 * Author: Huacai Chen <chenhuacai@loongson.cn>
 4 *
 5 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
 6 */
 7#ifndef __ASM_VDSO_GETTIMEOFDAY_H
 8#define __ASM_VDSO_GETTIMEOFDAY_H
 9
10#ifndef __ASSEMBLER__
11
12#include <asm/unistd.h>
13#include <asm/vdso/vdso.h>
14
15#ifdef CONFIG_GENERIC_GETTIMEOFDAY
16
17#define VDSO_HAS_CLOCK_GETRES		1
18
19static __always_inline long gettimeofday_fallback(
20				struct __kernel_old_timeval *_tv,
21				struct timezone *_tz)
22{
23	register struct __kernel_old_timeval *tv asm("a0") = _tv;
24	register struct timezone *tz asm("a1") = _tz;
25	register long nr asm("a7") = __NR_gettimeofday;
26	register long ret asm("a0");
27
28	asm volatile(
29	"       syscall 0\n"
30	: "=r" (ret)
31	: "r" (nr), "r" (tv), "r" (tz)
32	: "$t0", "$t1", "$t2", "$t3", "$t4", "$t5", "$t6", "$t7",
33	  "$t8", "memory");
34
35	return ret;
36}
37
38static __always_inline long clock_gettime_fallback(
39					clockid_t _clkid,
40					struct __kernel_timespec *_ts)
41{
42	register clockid_t clkid asm("a0") = _clkid;
43	register struct __kernel_timespec *ts asm("a1") = _ts;
44	register long nr asm("a7") = __NR_clock_gettime;
45	register long ret asm("a0");
46
47	asm volatile(
48	"       syscall 0\n"
49	: "=r" (ret)
50	: "r" (nr), "r" (clkid), "r" (ts)
51	: "$t0", "$t1", "$t2", "$t3", "$t4", "$t5", "$t6", "$t7",
52	  "$t8", "memory");
53
54	return ret;
55}
56
57static __always_inline int clock_getres_fallback(
58					clockid_t _clkid,
59					struct __kernel_timespec *_ts)
60{
61	register clockid_t clkid asm("a0") = _clkid;
62	register struct __kernel_timespec *ts asm("a1") = _ts;
63	register long nr asm("a7") = __NR_clock_getres;
64	register long ret asm("a0");
65
66	asm volatile(
67	"       syscall 0\n"
68	: "=r" (ret)
69	: "r" (nr), "r" (clkid), "r" (ts)
70	: "$t0", "$t1", "$t2", "$t3", "$t4", "$t5", "$t6", "$t7",
71	  "$t8", "memory");
72
73	return ret;
74}
75
76static __always_inline u64 __arch_get_hw_counter(s32 clock_mode,
77						 const struct vdso_time_data *vd)
78{
79	uint64_t count;
80
81	__asm__ __volatile__(
82	"	rdtime.d %0, $zero\n"
83	: "=r" (count));
84
85	return count;
86}
87
88static inline bool loongarch_vdso_hres_capable(void)
89{
90	return true;
91}
92#define __arch_vdso_hres_capable loongarch_vdso_hres_capable
93
94#endif /* CONFIG_GENERIC_GETTIMEOFDAY */
95
96#endif /* !__ASSEMBLER__ */
97
98#endif /* __ASM_VDSO_GETTIMEOFDAY_H */