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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright 2012 Konstantin Belousov <kib@FreeBSD.ORG>.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $FreeBSD$
*/
#ifndef _SYS_VDSO_H
#define _SYS_VDSO_H
#include <sys/types.h>
#include <machine/vdso.h>
struct vdso_timehands {
uint32_t th_algo;
uint32_t th_gen;
uint64_t th_scale;
uint32_t th_offset_count;
uint32_t th_counter_mask;
struct bintime th_offset;
struct bintime th_boottime;
VDSO_TIMEHANDS_MD
};
struct vdso_timekeep {
uint32_t tk_ver;
uint32_t tk_enabled;
uint32_t tk_current;
struct vdso_timehands tk_th[];
};
#define VDSO_TK_CURRENT_BUSY 0xffffffff
#define VDSO_TK_VER_1 0x1
#define VDSO_TK_VER_CURR VDSO_TK_VER_1
#define VDSO_TH_ALGO_1 0x1
#define VDSO_TH_ALGO_2 0x2
#define VDSO_TH_ALGO_3 0x3
#define VDSO_TH_ALGO_4 0x4
struct vdso_fxrng_generation_1 {
uint32_t fx_vdso_version; /* 1 */
uint32_t fx_generation32;
uint64_t _fx_reserved;
};
_Static_assert(sizeof(struct vdso_fxrng_generation_1) == 16, "");
#define vdso_fxrng_generation vdso_fxrng_generation_1
/* fx_vdso_version values: */
#define VDSO_FXRNG_VER_1 0x1
#define VDSO_FXRNG_VER_CURR VDSO_FXRNG_VER_1
#ifndef _KERNEL
struct timespec;
struct timeval;
struct timezone;
int __vdso_clock_gettime(clockid_t clock_id, struct timespec *ts);
int __vdso_gettimeofday(struct timeval *tv, struct timezone *tz);
int __vdso_gettc(const struct vdso_timehands *vdso_th, u_int *tc);
int __vdso_gettimekeep(struct vdso_timekeep **tk);
#endif
#ifdef _KERNEL
struct timecounter;
struct vdso_sv_tk {
int sv_timekeep_off;
int sv_timekeep_curr;
uint32_t sv_timekeep_gen;
};
#ifdef RANDOM_FENESTRASX
void fxrng_push_seed_generation(uint64_t gen);
#endif
void timekeep_push_vdso(void);
uint32_t tc_fill_vdso_timehands(struct vdso_timehands *vdso_th);
/*
* The cpu_fill_vdso_timehands() function should fill MD-part of the
* struct vdso_timehands, which is both machine- and
* timecounter-depended. The return value should be 1 if fast
* userspace timecounter is enabled by hardware, and 0 otherwise. The
* global sysctl enable override is handled by machine-independed code
* after cpu_fill_vdso_timehands() call is made.
*/
uint32_t cpu_fill_vdso_timehands(struct vdso_timehands *vdso_th,
struct timecounter *tc);
struct vdso_sv_tk *alloc_sv_tk(void);
#define VDSO_TH_NUM 4
#ifdef COMPAT_FREEBSD32
/*
* i386 is the only arch with a 32 bit time_t.
*/
struct bintime32 {
#if defined(__amd64__)
uint32_t sec;
#else
uint64_t sec;
#endif
uint32_t frac[2];
};
struct vdso_timehands32 {
uint32_t th_algo;
uint32_t th_gen;
uint32_t th_scale[2];
uint32_t th_offset_count;
uint32_t th_counter_mask;
struct bintime32 th_offset;
struct bintime32 th_boottime;
VDSO_TIMEHANDS_MD32
};
struct vdso_timekeep32 {
uint32_t tk_ver;
uint32_t tk_enabled;
uint32_t tk_current;
struct vdso_timehands32 tk_th[];
};
uint32_t tc_fill_vdso_timehands32(struct vdso_timehands32 *vdso_th32);
uint32_t cpu_fill_vdso_timehands32(struct vdso_timehands32 *vdso_th32,
struct timecounter *tc);
struct vdso_sv_tk *alloc_sv_tk_compat32(void);
#endif
#endif
#endif