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  *   ˆÀ¿ƒyöY_†I|¥+a–äY>”Jj"TâjãoÜd*bÑ¿Ã "å    /* SPDX-License-Identifier: GPL-2.0 */
/*
 * Fast user context implementation of clock_gettime, gettimeofday, and time.
 *
 * Copyright (C) 2019 ARM Limited.
 * Copyright 2006 Andi Kleen, SUSE Labs.
 * 32 Bit compat layer by Stefani Seibold <stefani@seibold.net>
 *  sponsored by Rohde & Schwarz GmbH & Co. KG Munich/Germany
 */
#ifndef __ASM_VDSO_GETTIMEOFDAY_H
#define __ASM_VDSO_GETTIMEOFDAY_H

#ifndef __ASSEMBLY__

#include <uapi/linux/time.h>
#include <asm/vgtod.h>
#include <asm/vvar.h>
#include <asm/unistd.h>
#include <asm/msr.h>
#include <asm/pvclock.h>
#include <clocksource/hyperv_timer.h>

#define __vdso_data (VVAR(_vdso_data))
#define __timens_vdso_data (TIMENS(_vdso_data))

#define VDSO_HAS_TIME 1

#define VDSO_HAS_CLOCK_GETRES 1

/*
 * Declare the memory-mapped vclock data pages.  These come from hypervisors.
 * If we ever reintroduce something like direct access to an MMIO clock like
 * the HPET again, it will go here as well.
 *
 * A load from any of these pages will segfault if the clock in question is
 * disabled, so appropriate compiler barriers and checks need to be used
 * to prevent stray loads.
 *
 * These declarations MUST NOT be const.  The compiler will assume that
 * an extern const variable has genuinely constant contents, and the
 * resulting code won't work, since the whole point is that these pages
 * change over time, possibly while we're accessing them.
 */

#ifdef CONFIG_PARAVIRT_CLOCK
/*
 * This is the vCPU 0 pvclock page.  We only use pvclock from the vDSO
 * if the hypervisor tells us that all vCPUs can get valid data from the
 * vCPU 0 page.
 */
extern struct pvclock_vsyscall_time_info pvclock_page
	__attribute__((visibility("hidden")));
#endif

#ifdef CONFIG_HYPERV_TIMER
extern struct ms_hyperv_tsc_page hvclock_page
	__attribute__((visibility("hidden")));
#endif

#ifdef CONFIG_TIME_NS
static __always_inline
const struct vdso_data *__arch_get_timens_vdso_data(const struct vdso_data *vd)
{
	return __timens_vdso_data;
}
#endif

#ifndef BUILD_VDSO32

static __always_inline
long clock_gettime_fallback(clockid_t _clkid, struct __kernel_timespec *_ts)
{
	long ret;

	asm ("syscall" : "=a" (ret), "=m" (*_ts) :
	     "0" (__NR_clock_gettime), "D" (_clkid), "S" (_ts) :
	     "rcx", "r11");

	return ret;
}

static __always_inline
long gettimeofday_fallback(struct __kernel_old_timeval *_tv,
			   struct timezone *_tz)
{
	long ret;

	asm("syscall" : "=a" (ret) :
	    "0" (__NR_gettimeofday), "D" (_tv), "S" (_tz) : "memory");

	return ret;
}

static __always_inline
long clock_getres_fallback(clockid_t _clkid, struct __kernel_timespec *_ts)
{
	long ret;

	asm ("syscall" : "=a" (ret), "=m" (*_ts) :
	     "0" (__NR_clock_getres), "D" (_clkid), "S" (_ts) :
	     "rcx", "r11");

	return ret;
}

#else

static __always_inline
long clock_gettime_fallback(clockid_t _clkid, struct __kernel_timespec *_ts)
{
	long ret;

	asm (
		"mov %%ebx, %%edx \n"
		"mov %[clock], %%ebx \n"
		"call __kernel_vsyscall \n"
		"mov %%edx, %%ebx \n"
		: "=a" (ret), "=m" (*_ts)
		: "0" (__NR_clock_gettime64), [clock] "g" (_clkid), "c" (_ts)
		: "edx");

	return ret;
}

static __always_inline
long clock_gettime32_fallback(clockid_t _clkid, struct old_timespec32 *_ts)
{
	long ret;

	asm (
		"mov %%ebx, %%edx \n"
		"mov %[clock], %%ebx \n"
		"call __kernel_vsyscall \n"
		"mov %%edx, %%ebx \n"
		: "=a" (ret), "=m" (*_ts)
		: "0" (__NR_clock_gettime), [clock] "g" (_clkid), "c" (_ts)
		: "edx");

	return ret;
}

static __always_inline
long gettimeofday_fallback(struct __kernel_old_timeval *_tv,
			   struct timezone *_tz)
{
	long ret;

	asm(
		"mov %%ebx, %%edx \n"
		"mov %2, %%ebx \n"
		"call __kernel_vsyscall \n"
		"mov %%edx, %%ebx \n"
		: "=a" (ret)
		: "0" (__NR_gettimeofday), "g" (_tv), "c" (_tz)
		: "memory", "edx");

	return ret;
}

static __always_inline long
clock_getres_fallback(clockid_t _clkid, struct __kernel_timespec *_ts)
{
	long ret;

	asm (
		"mov %%ebx, %%edx \n"
		"mov %[clock], %%ebx \n"
		"call __kernel_vsyscall \n"
		"mov %%edx, %%ebx \n"
		: "=a" (ret