1ad5d1122SVincent Chen /* SPDX-License-Identifier: GPL-2.0 */ 2ad5d1122SVincent Chen #ifndef __ASM_VDSO_GETTIMEOFDAY_H 3ad5d1122SVincent Chen #define __ASM_VDSO_GETTIMEOFDAY_H 4ad5d1122SVincent Chen 5ad5d1122SVincent Chen #ifndef __ASSEMBLY__ 6ad5d1122SVincent Chen 7002dff36SWill Deacon #include <asm/barrier.h> 8ad5d1122SVincent Chen #include <asm/unistd.h> 9ad5d1122SVincent Chen #include <asm/csr.h> 10ad5d1122SVincent Chen #include <uapi/linux/time.h> 11ad5d1122SVincent Chen 12ad5d1122SVincent Chen #define VDSO_HAS_CLOCK_GETRES 1 13ad5d1122SVincent Chen 14ad5d1122SVincent Chen static __always_inline 15ad5d1122SVincent Chen int gettimeofday_fallback(struct __kernel_old_timeval *_tv, 16ad5d1122SVincent Chen struct timezone *_tz) 17ad5d1122SVincent Chen { 18ad5d1122SVincent Chen register struct __kernel_old_timeval *tv asm("a0") = _tv; 19ad5d1122SVincent Chen register struct timezone *tz asm("a1") = _tz; 20ad5d1122SVincent Chen register long ret asm("a0"); 21ad5d1122SVincent Chen register long nr asm("a7") = __NR_gettimeofday; 22ad5d1122SVincent Chen 23ad5d1122SVincent Chen asm volatile ("ecall\n" 24ad5d1122SVincent Chen : "=r" (ret) 25ad5d1122SVincent Chen : "r"(tv), "r"(tz), "r"(nr) 26ad5d1122SVincent Chen : "memory"); 27ad5d1122SVincent Chen 28ad5d1122SVincent Chen return ret; 29ad5d1122SVincent Chen } 30ad5d1122SVincent Chen 31ad5d1122SVincent Chen static __always_inline 32ad5d1122SVincent Chen long clock_gettime_fallback(clockid_t _clkid, struct __kernel_timespec *_ts) 33ad5d1122SVincent Chen { 34ad5d1122SVincent Chen register clockid_t clkid asm("a0") = _clkid; 35ad5d1122SVincent Chen register struct __kernel_timespec *ts asm("a1") = _ts; 36ad5d1122SVincent Chen register long ret asm("a0"); 37ad5d1122SVincent Chen register long nr asm("a7") = __NR_clock_gettime; 38ad5d1122SVincent Chen 39ad5d1122SVincent Chen asm volatile ("ecall\n" 40ad5d1122SVincent Chen : "=r" (ret) 41ad5d1122SVincent Chen : "r"(clkid), "r"(ts), "r"(nr) 42ad5d1122SVincent Chen : "memory"); 43ad5d1122SVincent Chen 44ad5d1122SVincent Chen return ret; 45ad5d1122SVincent Chen } 46ad5d1122SVincent Chen 47ad5d1122SVincent Chen static __always_inline 48ad5d1122SVincent Chen int clock_getres_fallback(clockid_t _clkid, struct __kernel_timespec *_ts) 49ad5d1122SVincent Chen { 50ad5d1122SVincent Chen register clockid_t clkid asm("a0") = _clkid; 51ad5d1122SVincent Chen register struct __kernel_timespec *ts asm("a1") = _ts; 52ad5d1122SVincent Chen register long ret asm("a0"); 53ad5d1122SVincent Chen register long nr asm("a7") = __NR_clock_getres; 54ad5d1122SVincent Chen 55ad5d1122SVincent Chen asm volatile ("ecall\n" 56ad5d1122SVincent Chen : "=r" (ret) 57ad5d1122SVincent Chen : "r"(clkid), "r"(ts), "r"(nr) 58ad5d1122SVincent Chen : "memory"); 59ad5d1122SVincent Chen 60ad5d1122SVincent Chen return ret; 61ad5d1122SVincent Chen } 62ad5d1122SVincent Chen 634c5a116aSThomas Gleixner static __always_inline u64 __arch_get_hw_counter(s32 clock_mode, 644c5a116aSThomas Gleixner const struct vdso_data *vd) 65ad5d1122SVincent Chen { 66ad5d1122SVincent Chen /* 67ad5d1122SVincent Chen * The purpose of csr_read(CSR_TIME) is to trap the system into 68ad5d1122SVincent Chen * M-mode to obtain the value of CSR_TIME. Hence, unlike other 69ad5d1122SVincent Chen * architecture, no fence instructions surround the csr_read() 70ad5d1122SVincent Chen */ 71ad5d1122SVincent Chen return csr_read(CSR_TIME); 72ad5d1122SVincent Chen } 73ad5d1122SVincent Chen 74ad5d1122SVincent Chen static __always_inline const struct vdso_data *__arch_get_vdso_data(void) 75ad5d1122SVincent Chen { 76ad5d1122SVincent Chen return _vdso_data; 77ad5d1122SVincent Chen } 78ad5d1122SVincent Chen 79ad5d1122SVincent Chen #endif /* !__ASSEMBLY__ */ 80ad5d1122SVincent Chen 81ad5d1122SVincent Chen #endif /* __ASM_VDSO_GETTIMEOFDAY_H */ 82