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 __ASSEMBLY__
11 
12 #include <asm/unistd.h>
13 #include <asm/vdso/vdso.h>
14 
15 #define VDSO_HAS_CLOCK_GETRES		1
16 
17 static __always_inline long gettimeofday_fallback(
18 				struct __kernel_old_timeval *_tv,
19 				struct timezone *_tz)
20 {
21 	register struct __kernel_old_timeval *tv asm("a0") = _tv;
22 	register struct timezone *tz asm("a1") = _tz;
23 	register long nr asm("a7") = __NR_gettimeofday;
24 	register long ret asm("a0");
25 
26 	asm volatile(
27 	"       syscall 0\n"
28 	: "+r" (ret)
29 	: "r" (nr), "r" (tv), "r" (tz)
30 	: "$t0", "$t1", "$t2", "$t3", "$t4", "$t5", "$t6", "$t7",
31 	  "$t8", "memory");
32 
33 	return ret;
34 }
35 
36 static __always_inline long clock_gettime_fallback(
37 					clockid_t _clkid,
38 					struct __kernel_timespec *_ts)
39 {
40 	register clockid_t clkid asm("a0") = _clkid;
41 	register struct __kernel_timespec *ts asm("a1") = _ts;
42 	register long nr asm("a7") = __NR_clock_gettime;
43 	register long ret asm("a0");
44 
45 	asm volatile(
46 	"       syscall 0\n"
47 	: "+r" (ret)
48 	: "r" (nr), "r" (clkid), "r" (ts)
49 	: "$t0", "$t1", "$t2", "$t3", "$t4", "$t5", "$t6", "$t7",
50 	  "$t8", "memory");
51 
52 	return ret;
53 }
54 
55 static __always_inline int clock_getres_fallback(
56 					clockid_t _clkid,
57 					struct __kernel_timespec *_ts)
58 {
59 	register clockid_t clkid asm("a0") = _clkid;
60 	register struct __kernel_timespec *ts asm("a1") = _ts;
61 	register long nr asm("a7") = __NR_clock_getres;
62 	register long ret asm("a0");
63 
64 	asm volatile(
65 	"       syscall 0\n"
66 	: "+r" (ret)
67 	: "r" (nr), "r" (clkid), "r" (ts)
68 	: "$t0", "$t1", "$t2", "$t3", "$t4", "$t5", "$t6", "$t7",
69 	  "$t8", "memory");
70 
71 	return ret;
72 }
73 
74 static __always_inline u64 __arch_get_hw_counter(s32 clock_mode,
75 						 const struct vdso_data *vd)
76 {
77 	uint64_t count;
78 
79 	__asm__ __volatile__(
80 	"	rdtime.d %0, $zero\n"
81 	: "=r" (count));
82 
83 	return count;
84 }
85 
86 static inline bool loongarch_vdso_hres_capable(void)
87 {
88 	return true;
89 }
90 #define __arch_vdso_hres_capable loongarch_vdso_hres_capable
91 
92 static __always_inline const struct vdso_data *__arch_get_vdso_data(void)
93 {
94 	return (const struct vdso_data *)get_vdso_data();
95 }
96 
97 #ifdef CONFIG_TIME_NS
98 static __always_inline
99 const struct vdso_data *__arch_get_timens_vdso_data(const struct vdso_data *vd)
100 {
101 	return (const struct vdso_data *)(get_vdso_data() + VVAR_TIMENS_PAGE_OFFSET * PAGE_SIZE);
102 }
103 #endif
104 #endif /* !__ASSEMBLY__ */
105 
106 #endif /* __ASM_VDSO_GETTIMEOFDAY_H */
107