1 /*
2 * Copyright (C) 2018 ARM Limited
3 * Copyright (C) 2015 Imagination Technologies
4 * Author: Alex Smith <alex.smith@imgtec.com>
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/vdso/vdso.h>
17 #include <asm/clocksource.h>
18 #include <asm/unistd.h>
19 #include <asm/vdso.h>
20
21 #define VDSO_HAS_CLOCK_GETRES 1
22
gettimeofday_fallback(struct __kernel_old_timeval * _tv,struct timezone * _tz)23 static __always_inline long gettimeofday_fallback(
24 struct __kernel_old_timeval *_tv,
25 struct timezone *_tz)
26 {
27 register struct timezone *tz asm("a1") = _tz;
28 register struct __kernel_old_timeval *tv asm("a0") = _tv;
29 register long ret asm("v0");
30 register long nr asm("v0") = __NR_gettimeofday;
31 register long error asm("a3");
32
33 asm volatile(
34 " syscall\n"
35 : "=r" (ret), "=r" (error)
36 : "r" (tv), "r" (tz), "r" (nr)
37 : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
38 "$14", "$15", "$24", "$25", "hi", "lo", "memory");
39
40 return error ? -ret : ret;
41 }
42
clock_gettime_fallback(clockid_t _clkid,struct __kernel_timespec * _ts)43 static __always_inline long clock_gettime_fallback(
44 clockid_t _clkid,
45 struct __kernel_timespec *_ts)
46 {
47 register struct __kernel_timespec *ts asm("a1") = _ts;
48 register clockid_t clkid asm("a0") = _clkid;
49 register long ret asm("v0");
50 #if _MIPS_SIM == _MIPS_SIM_ABI64
51 register long nr asm("v0") = __NR_clock_gettime;
52 #else
53 register long nr asm("v0") = __NR_clock_gettime64;
54 #endif
55 register long error asm("a3");
56
57 asm volatile(
58 " syscall\n"
59 : "=r" (ret), "=r" (error)
60 : "r" (clkid), "r" (ts), "r" (nr)
61 : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
62 "$14", "$15", "$24", "$25", "hi", "lo", "memory");
63
64 return error ? -ret : ret;
65 }
66
clock_getres_fallback(clockid_t _clkid,struct __kernel_timespec * _ts)67 static __always_inline int clock_getres_fallback(
68 clockid_t _clkid,
69 struct __kernel_timespec *_ts)
70 {
71 register struct __kernel_timespec *ts asm("a1") = _ts;
72 register clockid_t clkid asm("a0") = _clkid;
73 register long ret asm("v0");
74 #if _MIPS_SIM == _MIPS_SIM_ABI64
75 register long nr asm("v0") = __NR_clock_getres;
76 #else
77 register long nr asm("v0") = __NR_clock_getres_time64;
78 #endif
79 register long error asm("a3");
80
81 asm volatile(
82 " syscall\n"
83 : "=r" (ret), "=r" (error)
84 : "r" (clkid), "r" (ts), "r" (nr)
85 : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
86 "$14", "$15", "$24", "$25", "hi", "lo", "memory");
87
88 return error ? -ret : ret;
89 }
90
91 #if _MIPS_SIM != _MIPS_SIM_ABI64
92
clock_gettime32_fallback(clockid_t _clkid,struct old_timespec32 * _ts)93 static __always_inline long clock_gettime32_fallback(
94 clockid_t _clkid,
95 struct old_timespec32 *_ts)
96 {
97 register struct old_timespec32 *ts asm("a1") = _ts;
98 register clockid_t clkid asm("a0") = _clkid;
99 register long ret asm("v0");
100 register long nr asm("v0") = __NR_clock_gettime;
101 register long error asm("a3");
102
103 asm volatile(
104 " syscall\n"
105 : "=r" (ret), "=r" (error)
106 : "r" (clkid), "r" (ts), "r" (nr)
107 : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
108 "$14", "$15", "$24", "$25", "hi", "lo", "memory");
109
110 return error ? -ret : ret;
111 }
112
clock_getres32_fallback(clockid_t _clkid,struct old_timespec32 * _ts)113 static __always_inline int clock_getres32_fallback(
114 clockid_t _clkid,
115 struct old_timespec32 *_ts)
116 {
117 register struct old_timespec32 *ts asm("a1") = _ts;
118 register clockid_t clkid asm("a0") = _clkid;
119 register long ret asm("v0");
120 register long nr asm("v0") = __NR_clock_getres;
121 register long error asm("a3");
122
123 asm volatile(
124 " syscall\n"
125 : "=r" (ret), "=r" (error)
126 : "r" (clkid), "r" (ts), "r" (nr)
127 : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
128 "$14", "$15", "$24", "$25", "hi", "lo", "memory");
129
130 return error ? -ret : ret;
131 }
132 #endif
133
134 #ifdef CONFIG_CSRC_R4K
135
read_r4k_count(void)136 static __always_inline u64 read_r4k_count(void)
137 {
138 unsigned int count;
139
140 __asm__ __volatile__(
141 " .set push\n"
142 " .set mips32r2\n"
143 " rdhwr %0, $2\n"
144 " .set pop\n"
145 : "=r" (count));
146
147 return count;
148 }
149
150 #endif
151
152 #ifdef CONFIG_CLKSRC_MIPS_GIC
153
read_gic_count(const struct vdso_data * data)154 static __always_inline u64 read_gic_count(const struct vdso_data *data)
155 {
156 void __iomem *gic = get_gic(data);
157 u32 hi, hi2, lo;
158
159 do {
160 hi = __raw_readl(gic + sizeof(lo));
161 lo = __raw_readl(gic);
162 hi2 = __raw_readl(gic + sizeof(lo));
163 } while (hi2 != hi);
164
165 return (((u64)hi) << 32) + lo;
166 }
167
168 #endif
169
__arch_get_hw_counter(s32 clock_mode,const struct vdso_data * vd)170 static __always_inline u64 __arch_get_hw_counter(s32 clock_mode,
171 const struct vdso_data *vd)
172 {
173 #ifdef CONFIG_CSRC_R4K
174 if (clock_mode == VDSO_CLOCKMODE_R4K)
175 return read_r4k_count();
176 #endif
177 #ifdef CONFIG_CLKSRC_MIPS_GIC
178 if (clock_mode == VDSO_CLOCKMODE_GIC)
179 return read_gic_count(vd);
180 #endif
181 /*
182 * Core checks mode already. So this raced against a concurrent
183 * update. Return something. Core will do another round see the
184 * change and fallback to syscall.
185 */
186 return 0;
187 }
188
mips_vdso_hres_capable(void)189 static inline bool mips_vdso_hres_capable(void)
190 {
191 return IS_ENABLED(CONFIG_CSRC_R4K) ||
192 IS_ENABLED(CONFIG_CLKSRC_MIPS_GIC);
193 }
194 #define __arch_vdso_hres_capable mips_vdso_hres_capable
195
__arch_get_vdso_data(void)196 static __always_inline const struct vdso_data *__arch_get_vdso_data(void)
197 {
198 return get_vdso_data();
199 }
200
201 #endif /* !__ASSEMBLY__ */
202
203 #endif /* __ASM_VDSO_GETTIMEOFDAY_H */
204