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📄 Make.tags.inc(2.13 KB)
📄 Makefile(302 B)
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📄 capabilities.conf(13.67 KB)
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📄 device_if.m(10.41 KB)
📄 firmw.S(2.15 KB)
📄 genassym.sh(1.11 KB)
📄 genoffset.c(1.68 KB)
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📄 imgact_aout.c(9.45 KB)
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📄 imgact_elf.c(76.32 KB)
📄 imgact_elf32.c(1.47 KB)
📄 imgact_elf64.c(1.47 KB)
📄 imgact_shell.c(8.41 KB)
📄 init_main.c(24.31 KB)
📄 init_sysent.c(95.3 KB)
📄 kern_acct.c(19.03 KB)
📄 kern_alq.c(24.97 KB)
📄 kern_clock.c(21.12 KB)
📄 kern_clocksource.c(23.34 KB)
📄 kern_condvar.c(11.28 KB)
📄 kern_conf.c(36.14 KB)
📄 kern_cons.c(15.75 KB)
📄 kern_context.c(3.59 KB)
📄 kern_cpu.c(30.77 KB)
📄 kern_cpuset.c(59.78 KB)
📄 kern_ctf.c(8.73 KB)
📄 kern_descrip.c(112.87 KB)
📄 kern_dtrace.c(2.94 KB)
📄 kern_dump.c(8.51 KB)
📄 kern_environment.c(22.75 KB)
📄 kern_et.c(7.1 KB)
📄 kern_event.c(62.49 KB)
📄 kern_exec.c(46.67 KB)
📄 kern_exit.c(34.61 KB)
📄 kern_fail.c(29.32 KB)
📄 kern_ffclock.c(12.66 KB)
📄 kern_fork.c(28.29 KB)
📄 kern_hhook.c(13.58 KB)
📄 kern_idle.c(2.74 KB)
📄 kern_intr.c(40.44 KB)
📄 kern_jail.c(112.67 KB)
📄 kern_kcov.c(15.32 KB)
📄 kern_khelp.c(9.45 KB)
📄 kern_kthread.c(11.8 KB)
📄 kern_ktr.c(11.93 KB)
📄 kern_ktrace.c(31.41 KB)
📄 kern_linker.c(54.3 KB)
📄 kern_lock.c(46.99 KB)
📄 kern_lockf.c(64.46 KB)
📄 kern_lockstat.c(3.8 KB)
📄 kern_loginclass.c(6.69 KB)
📄 kern_malloc.c(37.09 KB)
📄 kern_mbuf.c(43.16 KB)
📄 kern_mib.c(24.26 KB)
📄 kern_module.c(11.05 KB)
📄 kern_mtxpool.c(5.82 KB)
📄 kern_mutex.c(33.62 KB)
📄 kern_ntptime.c(32.49 KB)
📄 kern_osd.c(12.37 KB)
📄 kern_physio.c(5.74 KB)
📄 kern_pmc.c(8.89 KB)
📄 kern_poll.c(15.86 KB)
📄 kern_priv.c(9.14 KB)
📄 kern_proc.c(80.01 KB)
📄 kern_procctl.c(19.48 KB)
📄 kern_prot.c(57.94 KB)
📄 kern_racct.c(34.01 KB)
📄 kern_rangelock.c(8.67 KB)
📄 kern_rctl.c(53.87 KB)
📄 kern_resource.c(36.66 KB)
📄 kern_rmlock.c(28.27 KB)
📄 kern_rwlock.c(40.72 KB)
📄 kern_sdt.c(2.05 KB)
📄 kern_sema.c(4.85 KB)
📄 kern_sendfile.c(33.97 KB)
📄 kern_sharedpage.c(10.37 KB)
📄 kern_shutdown.c(43.34 KB)
📄 kern_sig.c(101.89 KB)
📄 kern_switch.c(13.85 KB)
📄 kern_sx.c(40.27 KB)
📄 kern_synch.c(18.17 KB)
📄 kern_syscalls.c(6.74 KB)
📄 kern_sysctl.c(67.24 KB)
📄 kern_tc.c(55.73 KB)
📄 kern_thr.c(14.14 KB)
📄 kern_thread.c(41.75 KB)
📄 kern_time.c(40.89 KB)
📄 kern_timeout.c(43.08 KB)
📄 kern_tslog.c(3.44 KB)
📄 kern_ubsan.c(50.74 KB)
📄 kern_umtx.c(107.14 KB)
📄 kern_uuid.c(11.68 KB)
📄 kern_xxx.c(10.44 KB)
📄 ksched.c(6.56 KB)
📄 link_elf.c(47.99 KB)
📄 link_elf_obj.c(44.41 KB)
📄 linker_if.m(3.96 KB)
📄 makesyscalls.sh(23.57 KB)
📄 md4c.c(7.89 KB)
📄 md5c.c(9.56 KB)
📄 msi_if.m(2.48 KB)
📄 p1003_1b.c(8.84 KB)
📄 pic_if.m(3.9 KB)
📄 posix4_mib.c(5.59 KB)
📄 sched_4bsd.c(45.03 KB)
📄 sched_ule.c(82.65 KB)
📄 serdev_if.m(3.49 KB)
📄 stack_protector.c(613 B)
📄 subr_acl_nfs4.c(37.42 KB)
📄 subr_acl_posix1e.c(17.71 KB)
📄 subr_atomic64.c(3.97 KB)
📄 subr_autoconf.c(7.7 KB)
📄 subr_blist.c(31.88 KB)
📄 subr_boot.c(5.8 KB)
📄 subr_bufring.c(2.21 KB)
📄 subr_bus.c(145.4 KB)
📄 subr_bus_dma.c(19.67 KB)
📄 subr_busdma_bufalloc.c(5.24 KB)
📄 subr_capability.c(11.93 KB)
📄 subr_clock.c(10.61 KB)
📄 subr_compressor.c(13.11 KB)
📄 subr_counter.c(4.44 KB)
📄 subr_coverage.c(6.17 KB)
📄 subr_csan.c(25.39 KB)
📄 subr_devmap.c(9.8 KB)
📄 subr_devstat.c(16.21 KB)
📄 subr_disk.c(8.54 KB)
📄 subr_dummy_vdso_tc.c(1.7 KB)
📄 subr_early.c(2.26 KB)
📄 subr_epoch.c(25.02 KB)
📄 subr_eventhandler.c(9.17 KB)
📄 subr_fattime.c(9.98 KB)
📄 subr_filter.c(12.2 KB)
📄 subr_firmware.c(13.88 KB)
📄 subr_gtaskqueue.c(20.19 KB)
📄 subr_hash.c(4.8 KB)
📄 subr_hints.c(12.87 KB)
📄 subr_intr.c(40.61 KB)
📄 subr_kdb.c(16.13 KB)
📄 subr_kobj.c(7.1 KB)
📄 subr_lock.c(18.81 KB)
📄 subr_log.c(7.64 KB)
📄 subr_mchain.c(11.06 KB)
📄 subr_module.c(12.98 KB)
📄 subr_msgbuf.c(10.6 KB)
📄 subr_param.c(10.93 KB)
📄 subr_pcpu.c(10.18 KB)
📄 subr_pctrie.c(20.99 KB)
📄 subr_physmem.c(11.52 KB)
📄 subr_pidctrl.c(5.43 KB)
📄 subr_power.c(3.13 KB)
📄 subr_prf.c(27.42 KB)
📄 subr_prng.c(3.36 KB)
📄 subr_prof.c(15.43 KB)
📄 subr_rangeset.c(8.5 KB)
📄 subr_rman.c(27.61 KB)
📄 subr_rtc.c(11.42 KB)
📄 subr_sbuf.c(20.53 KB)
📄 subr_scanf.c(15.59 KB)
📄 subr_sfbuf.c(6.17 KB)
📄 subr_sglist.c(22.83 KB)
📄 subr_sleepqueue.c(39.43 KB)
📄 subr_smp.c(31.62 KB)
📄 subr_smr.c(20.17 KB)
📄 subr_stack.c(6.47 KB)
📄 subr_stats.c(103.01 KB)
📄 subr_syscall.c(7.98 KB)
📄 subr_taskqueue.c(21.1 KB)
📄 subr_terminal.c(15.52 KB)
📄 subr_trap.c(10.87 KB)
📄 subr_turnstile.c(35.58 KB)
📄 subr_uio.c(11.38 KB)
📄 subr_unit.c(22.97 KB)
📄 subr_vmem.c(43.25 KB)
📄 subr_witness.c(84.59 KB)
📄 sys_capability.c(15.06 KB)
📄 sys_eventfd.c(8.42 KB)
📄 sys_generic.c(44.22 KB)
📄 sys_getrandom.c(4.21 KB)
📄 sys_pipe.c(45.14 KB)
📄 sys_procdesc.c(14.57 KB)
📄 sys_process.c(30.73 KB)
📄 sys_socket.c(20.11 KB)
📄 syscalls.c(22.73 KB)
📄 syscalls.master(60.26 KB)
📄 systrace_args.c(178.49 KB)
📄 sysv_ipc.c(6.53 KB)
📄 sysv_msg.c(48.65 KB)
📄 sysv_sem.c(49.85 KB)
📄 sysv_shm.c(43.93 KB)
📄 tty.c(55.14 KB)
📄 tty_compat.c(11.46 KB)
📄 tty_info.c(9.93 KB)
📄 tty_inq.c(12.22 KB)
📄 tty_outq.c(8.74 KB)
📄 tty_pts.c(19.74 KB)
📄 tty_tty.c(2.83 KB)
📄 tty_ttydisc.c(28.6 KB)
📄 uipc_accf.c(8.07 KB)
📄 uipc_debug.c(12.42 KB)
📄 uipc_domain.c(13.13 KB)
📄 uipc_ktls.c(55.7 KB)
📄 uipc_mbuf.c(52.45 KB)
📄 uipc_mbuf2.c(12.64 KB)
📄 uipc_mbufhash.c(4.9 KB)
📄 uipc_mqueue.c(64.64 KB)
📄 uipc_sem.c(25.18 KB)
📄 uipc_shm.c(50.47 KB)
📄 uipc_sockbuf.c(42.9 KB)
📄 uipc_socket.c(110.61 KB)
📄 uipc_syscalls.c(35.94 KB)
📄 uipc_usrreq.c(75.11 KB)
📄 vfs_acl.c(14.5 KB)
📄 vfs_aio.c(76.32 KB)
📄 vfs_bio.c(145.39 KB)
📄 vfs_cache.c(143.09 KB)
📄 vfs_cluster.c(28.36 KB)
📄 vfs_default.c(33.16 KB)
📄 vfs_export.c(14.55 KB)
📄 vfs_extattr.c(17.91 KB)
📄 vfs_hash.c(6 KB)
📄 vfs_init.c(15.86 KB)
📄 vfs_lookup.c(45.48 KB)
📄 vfs_mount.c(62.58 KB)
📄 vfs_mountroot.c(26.23 KB)
📄 vfs_subr.c(167.52 KB)
📄 vfs_syscalls.c(106.86 KB)
📄 vfs_vnops.c(86.28 KB)
📄 vnode_if.src(13.66 KB)

Editing: kern_ffclock.c

/*-
 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
 *
 * Copyright (c) 2011 The University of Melbourne
 * All rights reserved.
 *
 * This software was developed by Julien Ridoux at the University of Melbourne
 * under sponsorship from the FreeBSD Foundation.
 *
 * 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include "opt_ffclock.h"

#include <sys/param.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <sys/priv.h>
#include <sys/proc.h>
#include <sys/sbuf.h>
#include <sys/sysent.h>
#include <sys/sysproto.h>
#include <sys/sysctl.h>
#include <sys/systm.h>
#include <sys/timeffc.h>

#ifdef FFCLOCK

FEATURE(ffclock, "Feed-forward clock support");

extern struct ffclock_estimate ffclock_estimate;
extern struct bintime ffclock_boottime;
extern int8_t ffclock_updated;
extern struct mtx ffclock_mtx;

/*
 * Feed-forward clock absolute time. This should be the preferred way to read
 * the feed-forward clock for "wall-clock" type time. The flags allow to compose
 * various flavours of absolute time (e.g. with or without leap seconds taken
 * into account). If valid pointers are provided, the ffcounter value and an
 * upper bound on clock error associated with the bintime are provided.
 * NOTE: use ffclock_convert_abs() to differ the conversion of a ffcounter value
 * read earlier.
 */
void
ffclock_abstime(ffcounter *ffcount, struct bintime *bt,
    struct bintime *error_bound, uint32_t flags)
{
	struct ffclock_estimate cest;
	ffcounter ffc;
	ffcounter update_ffcount;
	ffcounter ffdelta_error;

/* Get counter and corresponding time. */
	if ((flags & FFCLOCK_FAST) == FFCLOCK_FAST)
		ffclock_last_tick(&ffc, bt, flags);
	else {
		ffclock_read_counter(&ffc);
		ffclock_convert_abs(ffc, bt, flags);
	}

/* Current ffclock estimate, use update_ffcount as generation number. */
	do {
		update_ffcount = ffclock_estimate.update_ffcount;
		bcopy(&ffclock_estimate, &cest, sizeof(struct ffclock_estimate));
	} while (update_ffcount != ffclock_estimate.update_ffcount);

/*
	 * Leap second adjustment. Total as seen by synchronisation algorithm
	 * since it started. cest.leapsec_next is the ffcounter prediction of
	 * when the next leapsecond occurs.
	 */
	if ((flags & FFCLOCK_LEAPSEC) == FFCLOCK_LEAPSEC) {
		bt->sec -= cest.leapsec_total;
		if (ffc > cest.leapsec_next)
			bt->sec -= cest.leapsec;
	}

/* Boot time adjustment, for uptime/monotonic clocks. */
	if ((flags & FFCLOCK_UPTIME) == FFCLOCK_UPTIME) {
		bintime_sub(bt, &ffclock_boottime);
	}

/* Compute error bound if a valid pointer has been passed. */
	if (error_bound) {
		ffdelta_error = ffc - cest.update_ffcount;
		ffclock_convert_diff(ffdelta_error, error_bound);
		/* 18446744073709 = int(2^64/1e12), err_bound_rate in [ps/s] */
		bintime_mul(error_bound, cest.errb_rate *
		    (uint64_t)18446744073709LL);
		/* 18446744073 = int(2^64 / 1e9), since err_abs in [ns] */
		bintime_addx(error_bound, cest.errb_abs *
		    (uint64_t)18446744073LL);
	}

if (ffcount)
		*ffcount = ffc;
}

/*
 * Feed-forward difference clock. This should be the preferred way to convert a
 * time interval in ffcounter values into a time interval in seconds. If a valid
 * pointer is passed, an upper bound on the error in computing the time interval
 * in seconds is provided.
 */
void
ffclock_difftime(ffcounter ffdelta, struct bintime *bt,
    struct bintime *error_bound)
{
	ffcounter update_ffcount;
	uint32_t err_rate;

ffclock_convert_diff(ffdelta, bt);

if (error_bound) {
		do {
			update_ffcount = ffclock_estimate.update_ffcount;
			err_rate = ffclock_estimate.errb_rate;
		} while (update_ffcount != ffclock_estimate.update_ffcount);

ffclock_convert_diff(ffdelta, error_bound);
		/* 18446744073709 = int(2^64/1e12), err_bound_rate in [ps/s] */
		bintime_mul(error_bound, err_rate * (uint64_t)18446744073709LL);
	}
}

/*
 * Create a new kern.sysclock sysctl node, which will be home to some generic
 * sysclock configuration variables. Feed-forward clock specific variables will
 * live under the ffclock subnode.
 */

SYSCTL_NODE(_kern, OID_AUTO, sysclock, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
    "System clock related configuration");
SYSCTL_NODE(_kern_sysclock, OID_AUTO, ffclock, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
    "Feed-forward clock configuration");

static char *sysclocks[] = {"feedback", "feed-forward"};
#define	MAX_SYSCLOCK_NAME_LEN 16
#define	NUM_SYSCLOCKS nitems(sysclocks)

static int ffclock_version = 2;
SYSCTL_INT(_kern_sysclock_ffclock, OID_AUTO, version, CTLFLAG_RD,
    &ffclock_version, 0, "Feed-forward clock kernel version");

/* List available sysclocks. */
static int
sysctl_kern_sysclock_available(SYSCTL_HANDLER_ARGS)
{
	struct sbuf *s;
	int clk, error;

s = sbuf_new_for_sysctl(NULL, NULL,
	    MAX_SYSCLOCK_NAME_LEN * NUM_SYSCLOCKS, req);
	if (s == NULL)
		return (ENOMEM);

for (clk = 0; clk < NUM_SYSCLOCKS; clk++) {
		sbuf_cat(s, sysclocks[clk]);
		if (clk + 1 < NUM_SYSCLOCKS)
			sbuf_cat(s, " ");
	}
	error = sbuf_finish(s);
	sbuf_delete(s);

return (error);
}

SYSCTL_PROC(_kern_sysclock, OID_AUTO, available,
    CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_NEEDGIANT, 0, 0,
    sysctl_kern_sysclock_available, "A",
    "List of available system clocks");

/*
 * Return the name of the active system clock if read, or attempt to change
 * the active system clock to the user specified one if written to. The active
 * system clock is read when calling any of the [get]{bin,nano,micro}[up]time()
 * functions.
 */
static int
sysctl_kern_sysclock_active(SYSCTL_HANDLER_ARGS)
{
	char newclock[MAX_SYSCLOCK_NAME_LEN];
	int error;
	int clk;

/* Return the name of the current active sysclock. */
	strlcpy(newclock, sysclocks[sysclock_active], sizeof(newclock));
	error = sysctl_handle_string(oidp, newclock, sizeof(newclock), req);

/* Check for error or no change */
	if (error != 0 || req->newptr == NULL)
		goto done;

/* Change the active sysclock to the user specified one: */
	error = EINVAL;
	for (clk = 0; clk < NUM_SYSCLOCKS; clk++) {
		if (strncmp(newclock, sysclocks[clk],
		    MAX_SYSCLOCK_NAME_LEN - 1)) {
			continue;
		}
		sysclock_active = clk;
		error = 0;
		break;
	}
done:
	return (error);
}

SYSCTL_PROC(_kern_sysclock, OID_AUTO, active,
    CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_NEEDGIANT, 0, 0,
    sysctl_kern_sysclock_active, "A",
    "Name of the active system clock which is currently serving time");

static int sysctl_kern_ffclock_ffcounter_bypass = 0;
SYSCTL_INT(_kern_sysclock_ffclock, OID_AUTO, ffcounter_bypass, CTLFLAG_RW,
    &sysctl_kern_ffclock_ffcounter_bypass, 0,
    "Use reliable hardware timecounter as the feed-forward counter");

/*
 * High level functions to access the Feed-Forward Clock.
 */
void
ffclock_bintime(struct bintime *bt)
{

ffclock_abstime(NULL, bt, NULL, FFCLOCK_LERP | FFCLOCK_LEAPSEC);
}

void
ffclock_nanotime(struct timespec *tsp)
{
	struct bintime bt;

ffclock_abstime(NULL, &bt, NULL, FFCLOCK_LERP | FFCLOCK_LEAPSEC);
	bintime2timespec(&bt, tsp);
}

void
ffclock_microtime(struct timeval *tvp)
{
	struct bintime bt;

ffclock_abstime(NULL, &bt, NULL, FFCLOCK_LERP | FFCLOCK_LEAPSEC);
	bintime2timeval(&bt, tvp);
}

void
ffclock_getbintime(struct bintime *bt)
{

ffclock_abstime(NULL, bt, NULL,
	    FFCLOCK_LERP | FFCLOCK_LEAPSEC | FFCLOCK_FAST);
}

void
ffclock_getnanotime(struct timespec *tsp)
{
	struct bintime bt;

ffclock_abstime(NULL, &bt, NULL,
	    FFCLOCK_LERP | FFCLOCK_LEAPSEC | FFCLOCK_FAST);
	bintime2timespec(&bt, tsp);
}

void
ffclock_getmicrotime(struct timeval *tvp)
{
	struct bintime bt;

ffclock_abstime(NULL, &bt, NULL,
	    FFCLOCK_LERP | FFCLOCK_LEAPSEC | FFCLOCK_FAST);
	bintime2timeval(&bt, tvp);
}

void
ffclock_binuptime(struct bintime *bt)
{

ffclock_abstime(NULL, bt, NULL, FFCLOCK_LERP | FFCLOCK_UPTIME);
}

void
ffclock_nanouptime(struct timespec *tsp)
{
	struct bintime bt;

ffclock_abstime(NULL, &bt, NULL, FFCLOCK_LERP | FFCLOCK_UPTIME);
	bintime2timespec(&bt, tsp);
}

void
ffclock_microuptime(struct timeval *tvp)
{
	struct bintime bt;

ffclock_abstime(NULL, &bt, NULL, FFCLOCK_LERP | FFCLOCK_UPTIME);
	bintime2timeval(&bt, tvp);
}

void
ffclock_getbinuptime(struct bintime *bt)
{

ffclock_abstime(NULL, bt, NULL,
	    FFCLOCK_LERP | FFCLOCK_UPTIME | FFCLOCK_FAST);
}

void
ffclock_getnanouptime(struct timespec *tsp)
{
	struct bintime bt;

ffclock_abstime(NULL, &bt, NULL,
	    FFCLOCK_LERP | FFCLOCK_UPTIME | FFCLOCK_FAST);
	bintime2timespec(&bt, tsp);
}

void
ffclock_getmicrouptime(struct timeval *tvp)
{
	struct bintime bt;

ffclock_abstime(NULL, &bt, NULL,
	    FFCLOCK_LERP | FFCLOCK_UPTIME | FFCLOCK_FAST);
	bintime2timeval(&bt, tvp);
}

void
ffclock_bindifftime(ffcounter ffdelta, struct bintime *bt)
{

ffclock_difftime(ffdelta, bt, NULL);
}

void
ffclock_nanodifftime(ffcounter ffdelta, struct timespec *tsp)
{
	struct bintime bt;

ffclock_difftime(ffdelta, &bt, NULL);
	bintime2timespec(&bt, tsp);
}

void
ffclock_microdifftime(ffcounter ffdelta, struct timeval *tvp)
{
	struct bintime bt;

ffclock_difftime(ffdelta, &bt, NULL);
	bintime2timeval(&bt, tvp);
}

/*
 * System call allowing userland applications to retrieve the current value of
 * the Feed-Forward Clock counter.
 */
#ifndef _SYS_SYSPROTO_H_
struct ffclock_getcounter_args {
	ffcounter *ffcount;
};
#endif
/* ARGSUSED */
int
sys_ffclock_getcounter(struct thread *td, struct ffclock_getcounter_args *uap)
{
	ffcounter ffcount;
	int error;

ffcount = 0;
	ffclock_read_counter(&ffcount);
	if (ffcount == 0)
		return (EAGAIN);
	error = copyout(&ffcount, uap->ffcount, sizeof(ffcounter));

return (error);
}

/*
 * System call allowing the synchronisation daemon to push new feed-foward clock
 * estimates to the kernel. Acquire ffclock_mtx to prevent concurrent updates
 * and ensure data consistency.
 * NOTE: ffclock_updated signals the fftimehands that new estimates are
 * available. The updated estimates are picked up by the fftimehands on next
 * tick, which could take as long as 1/hz seconds (if ticks are not missed).
 */
#ifndef _SYS_SYSPROTO_H_
struct ffclock_setestimate_args {
	struct ffclock_estimate *cest;
};
#endif
/* ARGSUSED */
int
sys_ffclock_setestimate(struct thread *td, struct ffclock_setestimate_args *uap)
{
	struct ffclock_estimate cest;
	int error;

/* Reuse of PRIV_CLOCK_SETTIME. */
	if ((error = priv_check(td, PRIV_CLOCK_SETTIME)) != 0)
		return (error);

if ((error = copyin(uap->cest, &cest, sizeof(struct ffclock_estimate)))
	    != 0)
		return (error);

mtx_lock(&ffclock_mtx);
	memcpy(&ffclock_estimate, &cest, sizeof(struct ffclock_estimate));
	ffclock_updated++;
	mtx_unlock(&ffclock_mtx);
	return (error);
}

/*
 * System call allowing userland applications to retrieve the clock estimates
 * stored within the kernel. It is useful to kickstart the synchronisation
 * daemon with the kernel's knowledge of hardware timecounter.
 */
#ifndef _SYS_SYSPROTO_H_
struct ffclock_getestimate_args {
	struct ffclock_estimate *cest;
};
#endif
/* ARGSUSED */
int
sys_ffclock_getestimate(struct thread *td, struct ffclock_getestimate_args *uap)
{
	struct ffclock_estimate cest;
	int error;

mtx_lock(&ffclock_mtx);
	memcpy(&cest, &ffclock_estimate, sizeof(struct ffclock_estimate));
	mtx_unlock(&ffclock_mtx);
	error = copyout(&cest, uap->cest, sizeof(struct ffclock_estimate));
	return (error);
}

#else /* !FFCLOCK */

int
sys_ffclock_getcounter(struct thread *td, struct ffclock_getcounter_args *uap)
{

return (ENOSYS);
}

int
sys_ffclock_setestimate(struct thread *td, struct ffclock_setestimate_args *uap)
{

return (ENOSYS);
}

int
sys_ffclock_getestimate(struct thread *td, struct ffclock_getestimate_args *uap)
{

return (ENOSYS);
}

#endif /* FFCLOCK */

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