2 * Copyright (C) 2018 ARM Limited
3 * Copyright (C) 2015 Imagination Technologies
4 * Author: Alex Smith <alex.smith@imgtec.com>
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.
11 #ifndef __ASM_VDSO_GETTIMEOFDAY_H
12 #define __ASM_VDSO_GETTIMEOFDAY_H
16 #include <linux/compiler.h>
17 #include <linux/time.h>
19 #include <asm/vdso/vdso.h>
20 #include <asm/clocksource.h>
22 #include <asm/unistd.h>
25 #define VDSO_HAS_CLOCK_GETRES 1
27 #ifdef CONFIG_MIPS_CLOCK_VSYSCALL
29 static __always_inline long gettimeofday_fallback(
30 struct __kernel_old_timeval *_tv,
33 register struct timezone *tz asm("a1") = _tz;
34 register struct __kernel_old_timeval *tv asm("a0") = _tv;
35 register long ret asm("v0");
36 register long nr asm("v0") = __NR_gettimeofday;
37 register long error asm("a3");
41 : "=r" (ret), "=r" (error)
42 : "r" (tv), "r" (tz), "r" (nr)
43 : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
44 "$14", "$15", "$24", "$25", "hi", "lo", "memory");
46 return error ? -ret : ret;
51 static __always_inline long gettimeofday_fallback(
52 struct __kernel_old_timeval *_tv,
60 static __always_inline long clock_gettime_fallback(
62 struct __kernel_timespec *_ts)
64 register struct __kernel_timespec *ts asm("a1") = _ts;
65 register clockid_t clkid asm("a0") = _clkid;
66 register long ret asm("v0");
67 #if _MIPS_SIM == _MIPS_SIM_ABI64
68 register long nr asm("v0") = __NR_clock_gettime;
70 register long nr asm("v0") = __NR_clock_gettime64;
72 register long error asm("a3");
76 : "=r" (ret), "=r" (error)
77 : "r" (clkid), "r" (ts), "r" (nr)
78 : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
79 "$14", "$15", "$24", "$25", "hi", "lo", "memory");
81 return error ? -ret : ret;
84 static __always_inline int clock_getres_fallback(
86 struct __kernel_timespec *_ts)
88 register struct __kernel_timespec *ts asm("a1") = _ts;
89 register clockid_t clkid asm("a0") = _clkid;
90 register long ret asm("v0");
91 #if _MIPS_SIM == _MIPS_SIM_ABI64
92 register long nr asm("v0") = __NR_clock_getres;
94 register long nr asm("v0") = __NR_clock_getres_time64;
96 register long error asm("a3");
100 : "=r" (ret), "=r" (error)
101 : "r" (clkid), "r" (ts), "r" (nr)
102 : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
103 "$14", "$15", "$24", "$25", "hi", "lo", "memory");
105 return error ? -ret : ret;
108 #if _MIPS_SIM != _MIPS_SIM_ABI64
110 #define VDSO_HAS_32BIT_FALLBACK 1
112 static __always_inline long clock_gettime32_fallback(
114 struct old_timespec32 *_ts)
116 register struct old_timespec32 *ts asm("a1") = _ts;
117 register clockid_t clkid asm("a0") = _clkid;
118 register long ret asm("v0");
119 register long nr asm("v0") = __NR_clock_gettime;
120 register long error asm("a3");
124 : "=r" (ret), "=r" (error)
125 : "r" (clkid), "r" (ts), "r" (nr)
126 : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
127 "$14", "$15", "$24", "$25", "hi", "lo", "memory");
129 return error ? -ret : ret;
132 static __always_inline int clock_getres32_fallback(
134 struct old_timespec32 *_ts)
136 register struct old_timespec32 *ts asm("a1") = _ts;
137 register clockid_t clkid asm("a0") = _clkid;
138 register long ret asm("v0");
139 register long nr asm("v0") = __NR_clock_getres;
140 register long error asm("a3");
144 : "=r" (ret), "=r" (error)
145 : "r" (clkid), "r" (ts), "r" (nr)
146 : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
147 "$14", "$15", "$24", "$25", "hi", "lo", "memory");
149 return error ? -ret : ret;
153 #ifdef CONFIG_CSRC_R4K
155 static __always_inline u64 read_r4k_count(void)
159 __asm__ __volatile__(
171 #ifdef CONFIG_CLKSRC_MIPS_GIC
173 static __always_inline u64 read_gic_count(const struct vdso_data *data)
175 void __iomem *gic = get_gic(data);
179 hi = __raw_readl(gic + sizeof(lo));
180 lo = __raw_readl(gic);
181 hi2 = __raw_readl(gic + sizeof(lo));
184 return (((u64)hi) << 32) + lo;
189 static __always_inline u64 __arch_get_hw_counter(s32 clock_mode)
191 #ifdef CONFIG_CLKSRC_MIPS_GIC
192 const struct vdso_data *data = get_vdso_data();
196 switch (clock_mode) {
197 #ifdef CONFIG_CSRC_R4K
199 cycle_now = read_r4k_count();
202 #ifdef CONFIG_CLKSRC_MIPS_GIC
204 cycle_now = read_gic_count(data);
215 static __always_inline const struct vdso_data *__arch_get_vdso_data(void)
217 return get_vdso_data();
220 #endif /* !__ASSEMBLY__ */
222 #endif /* __ASM_VDSO_GETTIMEOFDAY_H */