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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 <linux/compiler.h>
17#include <linux/time.h>
18
19#include <asm/vdso/vdso.h>
20#include <asm/clocksource.h>
21#include <asm/io.h>
22#include <asm/unistd.h>
23#include <asm/vdso.h>
24
25#define VDSO_HAS_CLOCK_GETRES 1
26
27#define __VDSO_USE_SYSCALL ULLONG_MAX
28
29#ifdef CONFIG_MIPS_CLOCK_VSYSCALL
30
31static __always_inline long gettimeofday_fallback(
32 struct __kernel_old_timeval *_tv,
33 struct timezone *_tz)
34{
35 register struct timezone *tz asm("a1") = _tz;
36 register struct __kernel_old_timeval *tv asm("a0") = _tv;
37 register long ret asm("v0");
38 register long nr asm("v0") = __NR_gettimeofday;
39 register long error asm("a3");
40
41 asm volatile(
42 " syscall\n"
43 : "=r" (ret), "=r" (error)
44 : "r" (tv), "r" (tz), "r" (nr)
45 : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
46 "$14", "$15", "$24", "$25", "hi", "lo", "memory");
47
48 return error ? -ret : ret;
49}
50
51#else
52
53static __always_inline long gettimeofday_fallback(
54 struct __kernel_old_timeval *_tv,
55 struct timezone *_tz)
56{
57 return -1;
58}
59
60#endif
61
62static __always_inline long clock_gettime_fallback(
63 clockid_t _clkid,
64 struct __kernel_timespec *_ts)
65{
66 register struct __kernel_timespec *ts asm("a1") = _ts;
67 register clockid_t clkid asm("a0") = _clkid;
68 register long ret asm("v0");
69#if _MIPS_SIM == _MIPS_SIM_ABI64
70 register long nr asm("v0") = __NR_clock_gettime;
71#else
72 register long nr asm("v0") = __NR_clock_gettime64;
73#endif
74 register long error asm("a3");
75
76 asm volatile(
77 " syscall\n"
78 : "=r" (ret), "=r" (error)
79 : "r" (clkid), "r" (ts), "r" (nr)
80 : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
81 "$14", "$15", "$24", "$25", "hi", "lo", "memory");
82
83 return error ? -ret : ret;
84}
85
86static __always_inline int clock_getres_fallback(
87 clockid_t _clkid,
88 struct __kernel_timespec *_ts)
89{
90 register struct __kernel_timespec *ts asm("a1") = _ts;
91 register clockid_t clkid asm("a0") = _clkid;
92 register long ret asm("v0");
93#if _MIPS_SIM == _MIPS_SIM_ABI64
94 register long nr asm("v0") = __NR_clock_getres;
95#else
96 register long nr asm("v0") = __NR_clock_getres_time64;
97#endif
98 register long error asm("a3");
99
100 asm volatile(
101 " syscall\n"
102 : "=r" (ret), "=r" (error)
103 : "r" (clkid), "r" (ts), "r" (nr)
104 : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
105 "$14", "$15", "$24", "$25", "hi", "lo", "memory");
106
107 return error ? -ret : ret;
108}
109
110#if _MIPS_SIM != _MIPS_SIM_ABI64
111
112#define VDSO_HAS_32BIT_FALLBACK 1
113
114static __always_inline long clock_gettime32_fallback(
115 clockid_t _clkid,
116 struct old_timespec32 *_ts)
117{
118 register struct old_timespec32 *ts asm("a1") = _ts;
119 register clockid_t clkid asm("a0") = _clkid;
120 register long ret asm("v0");
121 register long nr asm("v0") = __NR_clock_gettime;
122 register long error asm("a3");
123
124 asm volatile(
125 " syscall\n"
126 : "=r" (ret), "=r" (error)
127 : "r" (clkid), "r" (ts), "r" (nr)
128 : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
129 "$14", "$15", "$24", "$25", "hi", "lo", "memory");
130
131 return error ? -ret : ret;
132}
133
134static __always_inline int clock_getres32_fallback(
135 clockid_t _clkid,
136 struct old_timespec32 *_ts)
137{
138 register struct old_timespec32 *ts asm("a1") = _ts;
139 register clockid_t clkid asm("a0") = _clkid;
140 register long ret asm("v0");
141 register long nr asm("v0") = __NR_clock_getres;
142 register long error asm("a3");
143
144 asm volatile(
145 " syscall\n"
146 : "=r" (ret), "=r" (error)
147 : "r" (clkid), "r" (ts), "r" (nr)
148 : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
149 "$14", "$15", "$24", "$25", "hi", "lo", "memory");
150
151 return error ? -ret : ret;
152}
153#endif
154
155#ifdef CONFIG_CSRC_R4K
156
157static __always_inline u64 read_r4k_count(void)
158{
159 unsigned int count;
160
161 __asm__ __volatile__(
162 " .set push\n"
163 " .set mips32r2\n"
164 " rdhwr %0, $2\n"
165 " .set pop\n"
166 : "=r" (count));
167
168 return count;
169}
170
171#endif
172
173#ifdef CONFIG_CLKSRC_MIPS_GIC
174
175static __always_inline u64 read_gic_count(const struct vdso_data *data)
176{
177 void __iomem *gic = get_gic(data);
178 u32 hi, hi2, lo;
179
180 do {
181 hi = __raw_readl(gic + sizeof(lo));
182 lo = __raw_readl(gic);
183 hi2 = __raw_readl(gic + sizeof(lo));
184 } while (hi2 != hi);
185
186 return (((u64)hi) << 32) + lo;
187}
188
189#endif
190
191static __always_inline u64 __arch_get_hw_counter(s32 clock_mode)
192{
193#ifdef CONFIG_CLKSRC_MIPS_GIC
194 const struct vdso_data *data = get_vdso_data();
195#endif
196 u64 cycle_now;
197
198 switch (clock_mode) {
199#ifdef CONFIG_CSRC_R4K
200 case VDSO_CLOCK_R4K:
201 cycle_now = read_r4k_count();
202 break;
203#endif
204#ifdef CONFIG_CLKSRC_MIPS_GIC
205 case VDSO_CLOCK_GIC:
206 cycle_now = read_gic_count(data);
207 break;
208#endif
209 default:
210 cycle_now = __VDSO_USE_SYSCALL;
211 break;
212 }
213
214 return cycle_now;
215}
216
217static __always_inline const struct vdso_data *__arch_get_vdso_data(void)
218{
219 return get_vdso_data();
220}
221
222#endif /* !__ASSEMBLY__ */
223
224#endif /* __ASM_VDSO_GETTIMEOFDAY_H */
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
23#if MIPS_ISA_REV < 6
24#define VDSO_SYSCALL_CLOBBERS "hi", "lo",
25#else
26#define VDSO_SYSCALL_CLOBBERS
27#endif
28
29static __always_inline long gettimeofday_fallback(
30 struct __kernel_old_timeval *_tv,
31 struct timezone *_tz)
32{
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");
38
39 asm volatile(
40 " syscall\n"
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",
45 VDSO_SYSCALL_CLOBBERS
46 "memory");
47
48 return error ? -ret : ret;
49}
50
51static __always_inline long clock_gettime_fallback(
52 clockid_t _clkid,
53 struct __kernel_timespec *_ts)
54{
55 register struct __kernel_timespec *ts asm("a1") = _ts;
56 register clockid_t clkid asm("a0") = _clkid;
57 register long ret asm("v0");
58#if _MIPS_SIM == _MIPS_SIM_ABI64
59 register long nr asm("v0") = __NR_clock_gettime;
60#else
61 register long nr asm("v0") = __NR_clock_gettime64;
62#endif
63 register long error asm("a3");
64
65 asm volatile(
66 " syscall\n"
67 : "=r" (ret), "=r" (error)
68 : "r" (clkid), "r" (ts), "r" (nr)
69 : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
70 "$14", "$15", "$24", "$25",
71 VDSO_SYSCALL_CLOBBERS
72 "memory");
73
74 return error ? -ret : ret;
75}
76
77static __always_inline int clock_getres_fallback(
78 clockid_t _clkid,
79 struct __kernel_timespec *_ts)
80{
81 register struct __kernel_timespec *ts asm("a1") = _ts;
82 register clockid_t clkid asm("a0") = _clkid;
83 register long ret asm("v0");
84#if _MIPS_SIM == _MIPS_SIM_ABI64
85 register long nr asm("v0") = __NR_clock_getres;
86#else
87 register long nr asm("v0") = __NR_clock_getres_time64;
88#endif
89 register long error asm("a3");
90
91 asm volatile(
92 " syscall\n"
93 : "=r" (ret), "=r" (error)
94 : "r" (clkid), "r" (ts), "r" (nr)
95 : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
96 "$14", "$15", "$24", "$25",
97 VDSO_SYSCALL_CLOBBERS
98 "memory");
99
100 return error ? -ret : ret;
101}
102
103#if _MIPS_SIM != _MIPS_SIM_ABI64
104
105static __always_inline long clock_gettime32_fallback(
106 clockid_t _clkid,
107 struct old_timespec32 *_ts)
108{
109 register struct old_timespec32 *ts asm("a1") = _ts;
110 register clockid_t clkid asm("a0") = _clkid;
111 register long ret asm("v0");
112 register long nr asm("v0") = __NR_clock_gettime;
113 register long error asm("a3");
114
115 asm volatile(
116 " syscall\n"
117 : "=r" (ret), "=r" (error)
118 : "r" (clkid), "r" (ts), "r" (nr)
119 : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
120 "$14", "$15", "$24", "$25",
121 VDSO_SYSCALL_CLOBBERS
122 "memory");
123
124 return error ? -ret : ret;
125}
126
127static __always_inline int clock_getres32_fallback(
128 clockid_t _clkid,
129 struct old_timespec32 *_ts)
130{
131 register struct old_timespec32 *ts asm("a1") = _ts;
132 register clockid_t clkid asm("a0") = _clkid;
133 register long ret asm("v0");
134 register long nr asm("v0") = __NR_clock_getres;
135 register long error asm("a3");
136
137 asm volatile(
138 " syscall\n"
139 : "=r" (ret), "=r" (error)
140 : "r" (clkid), "r" (ts), "r" (nr)
141 : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
142 "$14", "$15", "$24", "$25",
143 VDSO_SYSCALL_CLOBBERS
144 "memory");
145
146 return error ? -ret : ret;
147}
148#endif
149
150#ifdef CONFIG_CSRC_R4K
151
152static __always_inline u64 read_r4k_count(void)
153{
154 unsigned int count;
155
156 __asm__ __volatile__(
157 " .set push\n"
158 " .set mips32r2\n"
159 " rdhwr %0, $2\n"
160 " .set pop\n"
161 : "=r" (count));
162
163 return count;
164}
165
166#endif
167
168#ifdef CONFIG_CLKSRC_MIPS_GIC
169
170static __always_inline u64 read_gic_count(const struct vdso_data *data)
171{
172 void __iomem *gic = get_gic(data);
173 u32 hi, hi2, lo;
174
175 do {
176 hi = __raw_readl(gic + sizeof(lo));
177 lo = __raw_readl(gic);
178 hi2 = __raw_readl(gic + sizeof(lo));
179 } while (hi2 != hi);
180
181 return (((u64)hi) << 32) + lo;
182}
183
184#endif
185
186static __always_inline u64 __arch_get_hw_counter(s32 clock_mode,
187 const struct vdso_data *vd)
188{
189#ifdef CONFIG_CSRC_R4K
190 if (clock_mode == VDSO_CLOCKMODE_R4K)
191 return read_r4k_count();
192#endif
193#ifdef CONFIG_CLKSRC_MIPS_GIC
194 if (clock_mode == VDSO_CLOCKMODE_GIC)
195 return read_gic_count(vd);
196#endif
197 /*
198 * Core checks mode already. So this raced against a concurrent
199 * update. Return something. Core will do another round see the
200 * change and fallback to syscall.
201 */
202 return 0;
203}
204
205static inline bool mips_vdso_hres_capable(void)
206{
207 return IS_ENABLED(CONFIG_CSRC_R4K) ||
208 IS_ENABLED(CONFIG_CLKSRC_MIPS_GIC);
209}
210#define __arch_vdso_hres_capable mips_vdso_hres_capable
211
212static __always_inline const struct vdso_data *__arch_get_vdso_data(void)
213{
214 return get_vdso_data();
215}
216
217#endif /* !__ASSEMBLY__ */
218
219#endif /* __ASM_VDSO_GETTIMEOFDAY_H */