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