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/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 27 static __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 47 static __always_inline 48 int 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 55 static __always_inline 56 int 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 61 static __always_inline 62 int 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 71 static __always_inline 72 int 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 77 static __always_inline 78 int 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 83 static __always_inline 84 int 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 89 static __always_inline 90 int 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 96 static __always_inline u64 __arch_get_hw_counter(s32 clock_mode, 97 const struct vdso_time_data *vd) 98 { 99 return get_tb(); 100 } 101 102 static 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__ 109 static __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__ 127 int __c_kernel_clock_gettime(clockid_t clock, struct __kernel_timespec *ts, 128 const struct vdso_time_data *vd); 129 int __c_kernel_clock_getres(clockid_t clock_id, struct __kernel_timespec *res, 130 const struct vdso_time_data *vd); 131 #else 132 int __c_kernel_clock_gettime(clockid_t clock, struct old_timespec32 *ts, 133 const struct vdso_time_data *vd); 134 int __c_kernel_clock_gettime64(clockid_t clock, struct __kernel_timespec *ts, 135 const struct vdso_time_data *vd); 136 int __c_kernel_clock_getres(clockid_t clock_id, struct old_timespec32 *res, 137 const struct vdso_time_data *vd); 138 #endif 139 int __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 /* __ASSEMBLY__ */ 145 146 #endif /* _ASM_POWERPC_VDSO_GETTIMEOFDAY_H */ 147