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