148 lines
3.2 KiB
C
148 lines
3.2 KiB
C
|
/* SPDX-License-Identifier: GPL-2.0 */
|
||
|
|
/*
|
||
|
|
* Copyright (C) 2018 ARM Limited
|
||
|
|
*/
|
||
|
|
#ifndef __ASM_VDSO_GETTIMEOFDAY_H
|
||
|
|
#define __ASM_VDSO_GETTIMEOFDAY_H
|
||
|
|
|
||
|
|
#ifndef __ASSEMBLY__
|
||
|
|
|
||
|
|
#include <asm/barrier.h>
|
||
|
|
#include <asm/errno.h>
|
||
|
|
#include <asm/unistd.h>
|
||
|
|
#include <asm/vdso/cp15.h>
|
||
|
|
#include <uapi/linux/time.h>
|
||
|
|
|
||
|
|
#define VDSO_HAS_CLOCK_GETRES 1
|
||
|
|
|
||
|
|
extern struct vdso_data *__get_datapage(void);
|
||
|
|
|
||
|
|
static __always_inline int gettimeofday_fallback(
|
||
|
|
struct __kernel_old_timeval *_tv,
|
||
|
|
struct timezone *_tz)
|
||
|
|
{
|
||
|
|
register struct timezone *tz asm("r1") = _tz;
|
||
|
|
register struct __kernel_old_timeval *tv asm("r0") = _tv;
|
||
|
|
register long ret asm ("r0");
|
||
|
|
register long nr asm("r7") = __NR_gettimeofday;
|
||
|
|
|
||
|
|
asm volatile(
|
||
|
|
" swi #0\n"
|
||
|
|
: "=r" (ret)
|
||
|
|
: "r" (tv), "r" (tz), "r" (nr)
|
||
|
|
: "memory");
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static __always_inline long clock_gettime_fallback(
|
||
|
|
clockid_t _clkid,
|
||
|
|
struct __kernel_timespec *_ts)
|
||
|
|
{
|
||
|
|
register struct __kernel_timespec *ts asm("r1") = _ts;
|
||
|
|
register clockid_t clkid asm("r0") = _clkid;
|
||
|
|
register long ret asm ("r0");
|
||
|
|
register long nr asm("r7") = __NR_clock_gettime64;
|
||
|
|
|
||
|
|
asm volatile(
|
||
|
|
" swi #0\n"
|
||
|
|
: "=r" (ret)
|
||
|
|
: "r" (clkid), "r" (ts), "r" (nr)
|
||
|
|
: "memory");
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static __always_inline long clock_gettime32_fallback(
|
||
|
|
clockid_t _clkid,
|
||
|
|
struct old_timespec32 *_ts)
|
||
|
|
{
|
||
|
|
register struct old_timespec32 *ts asm("r1") = _ts;
|
||
|
|
register clockid_t clkid asm("r0") = _clkid;
|
||
|
|
register long ret asm ("r0");
|
||
|
|
register long nr asm("r7") = __NR_clock_gettime;
|
||
|
|
|
||
|
|
asm volatile(
|
||
|
|
" swi #0\n"
|
||
|
|
: "=r" (ret)
|
||
|
|
: "r" (clkid), "r" (ts), "r" (nr)
|
||
|
|
: "memory");
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static __always_inline int clock_getres_fallback(
|
||
|
|
clockid_t _clkid,
|
||
|
|
struct __kernel_timespec *_ts)
|
||
|
|
{
|
||
|
|
register struct __kernel_timespec *ts asm("r1") = _ts;
|
||
|
|
register clockid_t clkid asm("r0") = _clkid;
|
||
|
|
register long ret asm ("r0");
|
||
|
|
register long nr asm("r7") = __NR_clock_getres_time64;
|
||
|
|
|
||
|
|
asm volatile(
|
||
|
|
" swi #0\n"
|
||
|
|
: "=r" (ret)
|
||
|
|
: "r" (clkid), "r" (ts), "r" (nr)
|
||
|
|
: "memory");
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static __always_inline int clock_getres32_fallback(
|
||
|
|
clockid_t _clkid,
|
||
|
|
struct old_timespec32 *_ts)
|
||
|
|
{
|
||
|
|
register struct old_timespec32 *ts asm("r1") = _ts;
|
||
|
|
register clockid_t clkid asm("r0") = _clkid;
|
||
|
|
register long ret asm ("r0");
|
||
|
|
register long nr asm("r7") = __NR_clock_getres;
|
||
|
|
|
||
|
|
asm volatile(
|
||
|
|
" swi #0\n"
|
||
|
|
: "=r" (ret)
|
||
|
|
: "r" (clkid), "r" (ts), "r" (nr)
|
||
|
|
: "memory");
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline bool arm_vdso_hres_capable(void)
|
||
|
|
{
|
||
|
|
return IS_ENABLED(CONFIG_ARM_ARCH_TIMER);
|
||
|
|
}
|
||
|
|
#define __arch_vdso_hres_capable arm_vdso_hres_capable
|
||
|
|
|
||
|
|
static __always_inline u64 __arch_get_hw_counter(int clock_mode,
|
||
|
|
const struct vdso_data *vd)
|
||
|
|
{
|
||
|
|
#ifdef CONFIG_ARM_ARCH_TIMER
|
||
|
|
u64 cycle_now;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Core checks for mode already, so this raced against a concurrent
|
||
|
|
* update. Return something. Core will do another round and then
|
||
|
|
* see the mode change and fallback to the syscall.
|
||
|
|
*/
|
||
|
|
if (clock_mode == VDSO_CLOCKMODE_NONE)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
isb();
|
||
|
|
cycle_now = read_sysreg(CNTVCT);
|
||
|
|
|
||
|
|
return cycle_now;
|
||
|
|
#else
|
||
|
|
/* Make GCC happy. This is compiled out anyway */
|
||
|
|
return 0;
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
|
||
|
|
static __always_inline const struct vdso_data *__arch_get_vdso_data(void)
|
||
|
|
{
|
||
|
|
return __get_datapage();
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif /* !__ASSEMBLY__ */
|
||
|
|
|
||
|
|
#endif /* __ASM_VDSO_GETTIMEOFDAY_H */
|