1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Author: Huacai Chen <chenhuacai@loongson.cn> 4 * 5 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited 6 */ 7 #ifndef __ASM_VDSO_GETTIMEOFDAY_H 8 #define __ASM_VDSO_GETTIMEOFDAY_H 9 10 #ifndef __ASSEMBLER__ 11 12 #include <asm/unistd.h> 13 #include <asm/vdso/vdso.h> 14 15 #ifdef CONFIG_GENERIC_GETTIMEOFDAY 16 17 #define VDSO_HAS_CLOCK_GETRES 1 18 19 static __always_inline long gettimeofday_fallback( 20 struct __kernel_old_timeval *_tv, 21 struct timezone *_tz) 22 { 23 register struct __kernel_old_timeval *tv asm("a0") = _tv; 24 register struct timezone *tz asm("a1") = _tz; 25 register long nr asm("a7") = __NR_gettimeofday; 26 register long ret asm("a0"); 27 28 asm volatile( 29 " syscall 0\n" 30 : "=r" (ret) 31 : "r" (nr), "r" (tv), "r" (tz) 32 : "$t0", "$t1", "$t2", "$t3", "$t4", "$t5", "$t6", "$t7", 33 "$t8", "memory"); 34 35 return ret; 36 } 37 38 static __always_inline long clock_gettime_fallback( 39 clockid_t _clkid, 40 struct __kernel_timespec *_ts) 41 { 42 register clockid_t clkid asm("a0") = _clkid; 43 register struct __kernel_timespec *ts asm("a1") = _ts; 44 register long nr asm("a7") = __NR_clock_gettime; 45 register long ret asm("a0"); 46 47 asm volatile( 48 " syscall 0\n" 49 : "=r" (ret) 50 : "r" (nr), "r" (clkid), "r" (ts) 51 : "$t0", "$t1", "$t2", "$t3", "$t4", "$t5", "$t6", "$t7", 52 "$t8", "memory"); 53 54 return ret; 55 } 56 57 static __always_inline int clock_getres_fallback( 58 clockid_t _clkid, 59 struct __kernel_timespec *_ts) 60 { 61 register clockid_t clkid asm("a0") = _clkid; 62 register struct __kernel_timespec *ts asm("a1") = _ts; 63 register long nr asm("a7") = __NR_clock_getres; 64 register long ret asm("a0"); 65 66 asm volatile( 67 " syscall 0\n" 68 : "=r" (ret) 69 : "r" (nr), "r" (clkid), "r" (ts) 70 : "$t0", "$t1", "$t2", "$t3", "$t4", "$t5", "$t6", "$t7", 71 "$t8", "memory"); 72 73 return ret; 74 } 75 76 static __always_inline u64 __arch_get_hw_counter(s32 clock_mode, 77 const struct vdso_time_data *vd) 78 { 79 uint64_t count; 80 81 __asm__ __volatile__( 82 " rdtime.d %0, $zero\n" 83 : "=r" (count)); 84 85 return count; 86 } 87 88 static inline bool loongarch_vdso_hres_capable(void) 89 { 90 return true; 91 } 92 #define __arch_vdso_hres_capable loongarch_vdso_hres_capable 93 94 #endif /* CONFIG_GENERIC_GETTIMEOFDAY */ 95 96 #endif /* !__ASSEMBLER__ */ 97 98 #endif /* __ASM_VDSO_GETTIMEOFDAY_H */ 99