1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __ASM_VDSO_GETTIMEOFDAY_H 3 #define __ASM_VDSO_GETTIMEOFDAY_H 4 5 #ifndef __ASSEMBLY__ 6 7 #include <asm/barrier.h> 8 #include <asm/unistd.h> 9 #include <asm/csr.h> 10 #include <uapi/linux/time.h> 11 12 #define VDSO_HAS_CLOCK_GETRES 1 13 14 static __always_inline 15 int gettimeofday_fallback(struct __kernel_old_timeval *_tv, 16 struct timezone *_tz) 17 { 18 register struct __kernel_old_timeval *tv asm("a0") = _tv; 19 register struct timezone *tz asm("a1") = _tz; 20 register long ret asm("a0"); 21 register long nr asm("a7") = __NR_gettimeofday; 22 23 asm volatile ("ecall\n" 24 : "=r" (ret) 25 : "r"(tv), "r"(tz), "r"(nr) 26 : "memory"); 27 28 return ret; 29 } 30 31 static __always_inline 32 long clock_gettime_fallback(clockid_t _clkid, struct __kernel_timespec *_ts) 33 { 34 register clockid_t clkid asm("a0") = _clkid; 35 register struct __kernel_timespec *ts asm("a1") = _ts; 36 register long ret asm("a0"); 37 register long nr asm("a7") = __NR_clock_gettime; 38 39 asm volatile ("ecall\n" 40 : "=r" (ret) 41 : "r"(clkid), "r"(ts), "r"(nr) 42 : "memory"); 43 44 return ret; 45 } 46 47 static __always_inline 48 int clock_getres_fallback(clockid_t _clkid, struct __kernel_timespec *_ts) 49 { 50 register clockid_t clkid asm("a0") = _clkid; 51 register struct __kernel_timespec *ts asm("a1") = _ts; 52 register long ret asm("a0"); 53 register long nr asm("a7") = __NR_clock_getres; 54 55 asm volatile ("ecall\n" 56 : "=r" (ret) 57 : "r"(clkid), "r"(ts), "r"(nr) 58 : "memory"); 59 60 return ret; 61 } 62 63 static __always_inline u64 __arch_get_hw_counter(s32 clock_mode, 64 const struct vdso_data *vd) 65 { 66 /* 67 * The purpose of csr_read(CSR_TIME) is to trap the system into 68 * M-mode to obtain the value of CSR_TIME. Hence, unlike other 69 * architecture, no fence instructions surround the csr_read() 70 */ 71 return csr_read(CSR_TIME); 72 } 73 74 static __always_inline const struct vdso_data *__arch_get_vdso_data(void) 75 { 76 return _vdso_data; 77 } 78 79 #ifdef CONFIG_TIME_NS 80 static __always_inline 81 const struct vdso_data *__arch_get_timens_vdso_data(const struct vdso_data *vd) 82 { 83 return _timens_data; 84 } 85 #endif 86 #endif /* !__ASSEMBLY__ */ 87 88 #endif /* __ASM_VDSO_GETTIMEOFDAY_H */ 89