1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright (C) 2018 ARM Limited 4 */ 5 #ifndef __ASM_VDSO_GETTIMEOFDAY_H 6 #define __ASM_VDSO_GETTIMEOFDAY_H 7 8 #ifdef __aarch64__ 9 10 #ifndef __ASSEMBLY__ 11 12 #include <asm/alternative.h> 13 #include <asm/arch_timer.h> 14 #include <asm/barrier.h> 15 #include <asm/unistd.h> 16 #include <asm/sysreg.h> 17 18 #define VDSO_HAS_CLOCK_GETRES 1 19 20 static __always_inline 21 int gettimeofday_fallback(struct __kernel_old_timeval *_tv, 22 struct timezone *_tz) 23 { 24 register struct timezone *tz asm("x1") = _tz; 25 register struct __kernel_old_timeval *tv asm("x0") = _tv; 26 register long ret asm ("x0"); 27 register long nr asm("x8") = __NR_gettimeofday; 28 29 asm volatile( 30 " svc #0\n" 31 : "=r" (ret) 32 : "r" (tv), "r" (tz), "r" (nr) 33 : "memory"); 34 35 return ret; 36 } 37 38 static __always_inline 39 long clock_gettime_fallback(clockid_t _clkid, struct __kernel_timespec *_ts) 40 { 41 register struct __kernel_timespec *ts asm("x1") = _ts; 42 register clockid_t clkid asm("x0") = _clkid; 43 register long ret asm ("x0"); 44 register long nr asm("x8") = __NR_clock_gettime; 45 46 asm volatile( 47 " svc #0\n" 48 : "=r" (ret) 49 : "r" (clkid), "r" (ts), "r" (nr) 50 : "memory"); 51 52 return ret; 53 } 54 55 static __always_inline 56 int clock_getres_fallback(clockid_t _clkid, struct __kernel_timespec *_ts) 57 { 58 register struct __kernel_timespec *ts asm("x1") = _ts; 59 register clockid_t clkid asm("x0") = _clkid; 60 register long ret asm ("x0"); 61 register long nr asm("x8") = __NR_clock_getres; 62 63 asm volatile( 64 " svc #0\n" 65 : "=r" (ret) 66 : "r" (clkid), "r" (ts), "r" (nr) 67 : "memory"); 68 69 return ret; 70 } 71 72 static __always_inline u64 __arch_get_hw_counter(s32 clock_mode, 73 const struct vdso_time_data *vd) 74 { 75 /* 76 * Core checks for mode already, so this raced against a concurrent 77 * update. Return something. Core will do another round and then 78 * see the mode change and fallback to the syscall. 79 */ 80 if (clock_mode == VDSO_CLOCKMODE_NONE) 81 return 0; 82 83 return __arch_counter_get_cntvct(); 84 } 85 86 #if IS_ENABLED(CONFIG_CC_IS_GCC) && IS_ENABLED(CONFIG_PAGE_SIZE_64KB) 87 static __always_inline const struct vdso_time_data *__arch_get_vdso_u_time_data(void) 88 { 89 const struct vdso_time_data *ret = &vdso_u_time_data; 90 91 /* Work around invalid absolute relocations */ 92 OPTIMIZER_HIDE_VAR(ret); 93 94 return ret; 95 } 96 #define __arch_get_vdso_u_time_data __arch_get_vdso_u_time_data 97 #endif /* IS_ENABLED(CONFIG_CC_IS_GCC) && IS_ENABLED(CONFIG_PAGE_SIZE_64KB) */ 98 99 #endif /* !__ASSEMBLY__ */ 100 101 #else /* !__aarch64__ */ 102 103 #include "compat_gettimeofday.h" 104 105 #endif /* __aarch64__ */ 106 107 #endif /* __ASM_VDSO_GETTIMEOFDAY_H */ 108