summaryrefslogtreecommitdiffstats
path: root/arch/mips/include/asm/vdso/gettimeofday.h
blob: b08825531e9f9a3ce89e926ffc3e096fbfe14fc0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
/*
 * Copyright (C) 2018 ARM Limited
 * Copyright (C) 2015 Imagination Technologies
 * Author: Alex Smith <alex.smith@imgtec.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */
#ifndef __ASM_VDSO_GETTIMEOFDAY_H
#define __ASM_VDSO_GETTIMEOFDAY_H

#ifndef __ASSEMBLY__

#include <linux/compiler.h>
#include <linux/time.h>

#include <asm/vdso/vdso.h>
#include <asm/clocksource.h>
#include <asm/io.h>
#include <asm/unistd.h>
#include <asm/vdso.h>

#define VDSO_HAS_CLOCK_GETRES		1

#define __VDSO_USE_SYSCALL		ULLONG_MAX

#ifdef CONFIG_MIPS_CLOCK_VSYSCALL

static __always_inline long gettimeofday_fallback(
				struct __kernel_old_timeval *_tv,
				struct timezone *_tz)
{
	register struct timezone *tz asm("a1") = _tz;
	register struct __kernel_old_timeval *tv asm("a0") = _tv;
	register long ret asm("v0");
	register long nr asm("v0") = __NR_gettimeofday;
	register long error asm("a3");

	asm volatile(
	"       syscall\n"
	: "=r" (ret), "=r" (error)
	: "r" (tv), "r" (tz), "r" (nr)
	: "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
	  "$14", "$15", "$24", "$25", "hi", "lo", "memory");

	return error ? -ret : ret;
}

#else

static __always_inline long gettimeofday_fallback(
				struct __kernel_old_timeval *_tv,
				struct timezone *_tz)
{
	return -1;
}

#endif

static __always_inline long clock_gettime_fallback(
					clockid_t _clkid,
					struct __kernel_timespec *_ts)
{
	register struct __kernel_timespec *ts asm("a1") = _ts;
	register clockid_t clkid asm("a0") = _clkid;
	register long ret asm("v0");
#if _MIPS_SIM == _MIPS_SIM_ABI64
	register long nr asm("v0") = __NR_clock_gettime;
#else
	register long nr asm("v0") = __NR_clock_gettime64;
#endif
	register long error asm("a3");

	asm volatile(
	"       syscall\n"
	: "=r" (ret), "=r" (error)
	: "r" (clkid), "r" (ts), "r" (nr)
	: "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
	  "$14", "$15", "$24", "$25", "hi", "lo", "memory");

	return error ? -ret : ret;
}

static __always_inline int clock_getres_fallback(
					clockid_t _clkid,
					struct __kernel_timespec *_ts)
{
	register struct __kernel_timespec *ts asm("a1") = _ts;
	register clockid_t clkid asm("a0") = _clkid;
	register long ret asm("v0");
#if _MIPS_SIM == _MIPS_SIM_ABI64
	register long nr asm("v0") = __NR_clock_getres;
#else
	register long nr asm("v0") = __NR_clock_getres_time64;
#endif
	register long error asm("a3");

	asm volatile(
	"       syscall\n"
	: "=r" (ret), "=r" (error)
	: "r" (clkid), "r" (ts), "r" (nr)
	: "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
	  "$14", "$15", "$24", "$25", "hi", "lo", "memory");

	return error ? -ret : ret;
}

#if _MIPS_SIM != _MIPS_SIM_ABI64

#define VDSO_HAS_32BIT_FALLBACK	1

static __always_inline long clock_gettime32_fallback(
					clockid_t _clkid,
					struct old_timespec32 *_ts)
{
	register struct old_timespec32 *ts asm("a1") = _ts;
	register clockid_t clkid asm("a0") = _clkid;
	register long ret asm("v0");
	register long nr asm("v0") = __NR_clock_gettime;
	register long error asm("a3");

	asm volatile(
	"       syscall\n"
	: "=r" (ret), "=r" (error)
	: "r" (clkid), "r" (ts), "r" (nr)
	: "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
	  "$14", "$15", "$24", "$25", "hi", "lo", "memory");

	return error ? -ret : ret;
}

static __always_inline int clock_getres32_fallback(
					clockid_t _clkid,
					struct old_timespec32 *_ts)
{
	register struct old_timespec32 *ts asm("a1") = _ts;
	register clockid_t clkid asm("a0") = _clkid;
	register long ret asm("v0");
	register long nr asm("v0") = __NR_clock_getres;
	register long error asm("a3");

	asm volatile(
	"       syscall\n"
	: "=r" (ret), "=r" (error)
	: "r" (clkid), "r" (ts), "r" (nr)
	: "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
	  "$14", "$15", "$24", "$25", "hi", "lo", "memory");

	return error ? -ret : ret;
}
#endif

#ifdef CONFIG_CSRC_R4K

static __always_inline u64 read_r4k_count(void)
{
	unsigned int count;

	__asm__ __volatile__(
	"	.set push\n"
	"	.set mips32r2\n"
	"	rdhwr	%0, $2\n"
	"	.set pop\n"
	: "=r" (count));

	return count;
}

#endif

#ifdef CONFIG_CLKSRC_MIPS_GIC

static __always_inline u64 read_gic_count(const struct vdso_data *data)
{
	void __iomem *gic = get_gic(data);
	u32 hi, hi2, lo;

	do {
		hi = __raw_readl(gic + sizeof(lo));
		lo = __raw_readl(gic);
		hi2 = __raw_readl(gic + sizeof(lo));
	} while (hi2 != hi);

	return (((u64)hi) << 32) + lo;
}

#endif

static __always_inline u64 __arch_get_hw_counter(s32 clock_mode)
{
#ifdef CONFIG_CLKSRC_MIPS_GIC
	const struct vdso_data *data = get_vdso_data();
#endif
	u64 cycle_now;

	switch (clock_mode) {
#ifdef CONFIG_CSRC_R4K
	case VDSO_CLOCK_R4K:
		cycle_now = read_r4k_count();
		break;
#endif
#ifdef CONFIG_CLKSRC_MIPS_GIC
	case VDSO_CLOCK_GIC:
		cycle_now = read_gic_count(data);
		break;
#endif
	default:
		cycle_now = __VDSO_USE_SYSCALL;
		break;
	}

	return cycle_now;
}

static __always_inline const struct vdso_data *__arch_get_vdso_data(void)
{
	return get_vdso_data();
}

#endif /* !__ASSEMBLY__ */

#endif /* __ASM_VDSO_GETTIMEOFDAY_H */