FM / vdso

/usr/src/linux-headers-5.15.0-181/arch/arm/include/asm/vdso/

/usr/src/linux-headers-5.15.0-181/arch/arm/include/asm/vdso

Name	Size	Mode	Actions
clocksource.h	199	0644	edit dl rm
cp15.h	954	0644	edit dl rm
gettimeofday.h	3277	0644	edit dl rm
processor.h	492	0644	edit dl rm
vsyscall.h	852	0644	edit dl rm

Edit: /usr/src/linux-headers-5.15.0-181/arch/arm/include/asm/vdso/gettimeofday.h (3277B)

/* 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 */

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