gettimeofday.h

  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 */