gettimeofday.h (4312B)
1/* SPDX-License-Identifier: GPL-2.0 */ 2#ifndef _ASM_POWERPC_VDSO_GETTIMEOFDAY_H 3#define _ASM_POWERPC_VDSO_GETTIMEOFDAY_H 4 5#ifndef __ASSEMBLY__ 6 7#include <asm/page.h> 8#include <asm/vdso/timebase.h> 9#include <asm/barrier.h> 10#include <asm/unistd.h> 11#include <uapi/linux/time.h> 12 13#define VDSO_HAS_CLOCK_GETRES 1 14 15#define VDSO_HAS_TIME 1 16 17static __always_inline int do_syscall_2(const unsigned long _r0, const unsigned long _r3, 18 const unsigned long _r4) 19{ 20 register long r0 asm("r0") = _r0; 21 register unsigned long r3 asm("r3") = _r3; 22 register unsigned long r4 asm("r4") = _r4; 23 register int ret asm ("r3"); 24 25 asm volatile( 26 " sc\n" 27 " bns+ 1f\n" 28 " neg %0, %0\n" 29 "1:\n" 30 : "=r" (ret), "+r" (r4), "+r" (r0) 31 : "r" (r3) 32 : "memory", "r5", "r6", "r7", "r8", "r9", "r10", "r11", "r12", "cr0", "ctr"); 33 34 return ret; 35} 36 37static __always_inline 38int gettimeofday_fallback(struct __kernel_old_timeval *_tv, struct timezone *_tz) 39{ 40 return do_syscall_2(__NR_gettimeofday, (unsigned long)_tv, (unsigned long)_tz); 41} 42 43#ifdef __powerpc64__ 44 45static __always_inline 46int clock_gettime_fallback(clockid_t _clkid, struct __kernel_timespec *_ts) 47{ 48 return do_syscall_2(__NR_clock_gettime, _clkid, (unsigned long)_ts); 49} 50 51static __always_inline 52int clock_getres_fallback(clockid_t _clkid, struct __kernel_timespec *_ts) 53{ 54 return do_syscall_2(__NR_clock_getres, _clkid, (unsigned long)_ts); 55} 56 57#else 58 59#define BUILD_VDSO32 1 60 61static __always_inline 62int clock_gettime_fallback(clockid_t _clkid, struct __kernel_timespec *_ts) 63{ 64 return do_syscall_2(__NR_clock_gettime64, _clkid, (unsigned long)_ts); 65} 66 67static __always_inline 68int clock_getres_fallback(clockid_t _clkid, struct __kernel_timespec *_ts) 69{ 70 return do_syscall_2(__NR_clock_getres_time64, _clkid, (unsigned long)_ts); 71} 72 73static __always_inline 74int clock_gettime32_fallback(clockid_t _clkid, struct old_timespec32 *_ts) 75{ 76 return do_syscall_2(__NR_clock_gettime, _clkid, (unsigned long)_ts); 77} 78 79static __always_inline 80int clock_getres32_fallback(clockid_t _clkid, struct old_timespec32 *_ts) 81{ 82 return do_syscall_2(__NR_clock_getres, _clkid, (unsigned long)_ts); 83} 84#endif 85 86static __always_inline u64 __arch_get_hw_counter(s32 clock_mode, 87 const struct vdso_data *vd) 88{ 89 return get_tb(); 90} 91 92const struct vdso_data *__arch_get_vdso_data(void); 93 94#ifdef CONFIG_TIME_NS 95static __always_inline 96const struct vdso_data *__arch_get_timens_vdso_data(const struct vdso_data *vd) 97{ 98 return (void *)vd + PAGE_SIZE; 99} 100#endif 101 102static inline bool vdso_clocksource_ok(const struct vdso_data *vd) 103{ 104 return true; 105} 106#define vdso_clocksource_ok vdso_clocksource_ok 107 108/* 109 * powerpc specific delta calculation. 110 * 111 * This variant removes the masking of the subtraction because the 112 * clocksource mask of all VDSO capable clocksources on powerpc is U64_MAX 113 * which would result in a pointless operation. The compiler cannot 114 * optimize it away as the mask comes from the vdso data and is not compile 115 * time constant. 116 */ 117static __always_inline u64 vdso_calc_delta(u64 cycles, u64 last, u64 mask, u32 mult) 118{ 119 return (cycles - last) * mult; 120} 121#define vdso_calc_delta vdso_calc_delta 122 123#ifndef __powerpc64__ 124static __always_inline u64 vdso_shift_ns(u64 ns, unsigned long shift) 125{ 126 u32 hi = ns >> 32; 127 u32 lo = ns; 128 129 lo >>= shift; 130 lo |= hi << (32 - shift); 131 hi >>= shift; 132 133 if (likely(hi == 0)) 134 return lo; 135 136 return ((u64)hi << 32) | lo; 137} 138#define vdso_shift_ns vdso_shift_ns 139#endif 140 141#ifdef __powerpc64__ 142int __c_kernel_clock_gettime(clockid_t clock, struct __kernel_timespec *ts, 143 const struct vdso_data *vd); 144int __c_kernel_clock_getres(clockid_t clock_id, struct __kernel_timespec *res, 145 const struct vdso_data *vd); 146#else 147int __c_kernel_clock_gettime(clockid_t clock, struct old_timespec32 *ts, 148 const struct vdso_data *vd); 149int __c_kernel_clock_gettime64(clockid_t clock, struct __kernel_timespec *ts, 150 const struct vdso_data *vd); 151int __c_kernel_clock_getres(clockid_t clock_id, struct old_timespec32 *res, 152 const struct vdso_data *vd); 153#endif 154int __c_kernel_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz, 155 const struct vdso_data *vd); 156__kernel_old_time_t __c_kernel_time(__kernel_old_time_t *time, 157 const struct vdso_data *vd); 158#endif /* __ASSEMBLY__ */ 159 160#endif /* _ASM_POWERPC_VDSO_GETTIMEOFDAY_H */