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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ASM_POWERPC_VDSO_GETTIMEOFDAY_H
3#define _ASM_POWERPC_VDSO_GETTIMEOFDAY_H
4
5#ifndef __ASSEMBLER__
6
7#include <asm/vdso/timebase.h>
8#include <asm/barrier.h>
9#include <asm/unistd.h>
10#include <uapi/linux/time.h>
11
12#define VDSO_HAS_CLOCK_GETRES 1
13
14#define VDSO_HAS_TIME 1
15
16/*
17 * powerpc specific delta calculation.
18 *
19 * This variant removes the masking of the subtraction because the
20 * clocksource mask of all VDSO capable clocksources on powerpc is U64_MAX
21 * which would result in a pointless operation. The compiler cannot
22 * optimize it away as the mask comes from the vdso data and is not compile
23 * time constant.
24 */
25#define VDSO_DELTA_NOMASK 1
26
27static __always_inline int do_syscall_2(const unsigned long _r0, const unsigned long _r3,
28 const unsigned long _r4)
29{
30 register long r0 asm("r0") = _r0;
31 register unsigned long r3 asm("r3") = _r3;
32 register unsigned long r4 asm("r4") = _r4;
33 register int ret asm ("r3");
34
35 asm volatile(
36 " sc\n"
37 " bns+ 1f\n"
38 " neg %0, %0\n"
39 "1:\n"
40 : "=r" (ret), "+r" (r4), "+r" (r0)
41 : "r" (r3)
42 : "memory", "r5", "r6", "r7", "r8", "r9", "r10", "r11", "r12", "cr0", "ctr");
43
44 return ret;
45}
46
47static __always_inline
48int gettimeofday_fallback(struct __kernel_old_timeval *_tv, struct timezone *_tz)
49{
50 return do_syscall_2(__NR_gettimeofday, (unsigned long)_tv, (unsigned long)_tz);
51}
52
53#ifdef __powerpc64__
54
55static __always_inline
56int clock_gettime_fallback(clockid_t _clkid, struct __kernel_timespec *_ts)
57{
58 return do_syscall_2(__NR_clock_gettime, _clkid, (unsigned long)_ts);
59}
60
61static __always_inline
62int clock_getres_fallback(clockid_t _clkid, struct __kernel_timespec *_ts)
63{
64 return do_syscall_2(__NR_clock_getres, _clkid, (unsigned long)_ts);
65}
66
67#else
68
69#define BUILD_VDSO32 1
70
71static __always_inline
72int clock_gettime_fallback(clockid_t _clkid, struct __kernel_timespec *_ts)
73{
74 return do_syscall_2(__NR_clock_gettime64, _clkid, (unsigned long)_ts);
75}
76
77static __always_inline
78int clock_getres_fallback(clockid_t _clkid, struct __kernel_timespec *_ts)
79{
80 return do_syscall_2(__NR_clock_getres_time64, _clkid, (unsigned long)_ts);
81}
82
83static __always_inline
84int clock_gettime32_fallback(clockid_t _clkid, struct old_timespec32 *_ts)
85{
86 return do_syscall_2(__NR_clock_gettime, _clkid, (unsigned long)_ts);
87}
88
89static __always_inline
90int clock_getres32_fallback(clockid_t _clkid, struct old_timespec32 *_ts)
91{
92 return do_syscall_2(__NR_clock_getres, _clkid, (unsigned long)_ts);
93}
94#endif
95
96static __always_inline u64 __arch_get_hw_counter(s32 clock_mode,
97 const struct vdso_time_data *vd)
98{
99 return get_tb();
100}
101
102static inline bool vdso_clocksource_ok(const struct vdso_clock *vc)
103{
104 return true;
105}
106#define vdso_clocksource_ok vdso_clocksource_ok
107
108#ifndef __powerpc64__
109static __always_inline u64 vdso_shift_ns(u64 ns, unsigned long shift)
110{
111 u32 hi = ns >> 32;
112 u32 lo = ns;
113
114 lo >>= shift;
115 lo |= hi << (32 - shift);
116 hi >>= shift;
117
118 if (likely(hi == 0))
119 return lo;
120
121 return ((u64)hi << 32) | lo;
122}
123#define vdso_shift_ns vdso_shift_ns
124#endif
125
126#ifdef __powerpc64__
127int __c_kernel_clock_gettime(clockid_t clock, struct __kernel_timespec *ts,
128 const struct vdso_time_data *vd);
129int __c_kernel_clock_getres(clockid_t clock_id, struct __kernel_timespec *res,
130 const struct vdso_time_data *vd);
131#else
132int __c_kernel_clock_gettime(clockid_t clock, struct old_timespec32 *ts,
133 const struct vdso_time_data *vd);
134int __c_kernel_clock_gettime64(clockid_t clock, struct __kernel_timespec *ts,
135 const struct vdso_time_data *vd);
136int __c_kernel_clock_getres(clockid_t clock_id, struct old_timespec32 *res,
137 const struct vdso_time_data *vd);
138#endif
139int __c_kernel_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz,
140 const struct vdso_time_data *vd);
141__kernel_old_time_t __c_kernel_time(__kernel_old_time_t *time,
142 const struct vdso_time_data *vd);
143
144#endif /* __ASSEMBLER__ */
145
146#endif /* _ASM_POWERPC_VDSO_GETTIMEOFDAY_H */