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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 | |
| 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 /* __ASSEMBLER__ */ |
| 145 | |
| 146 | #endif /* _ASM_POWERPC_VDSO_GETTIMEOFDAY_H */ |
| 147 |
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