/*
* Copyright (c) 2017 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. The rights granted to you under the License
* may not be used to create, or enable the creation or redistribution of,
* unlawful or unlicensed copies of an Apple operating system, or to
* circumvent, violate, or enable the circumvention or violation of, any
* terms of an Apple operating system software license agreement.
*
* Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
#include <kern/misc_protos.h>
#include <machine/atomic.h>
#include <mach/mach_time.h>
#include <mach/clock_types.h>
#include <kern/clock.h>
#include <kern/locks.h>
#include <arm64/machine_remote_time.h>
#include <sys/kdebug.h>
#include <arm/machine_routines.h>
#include <kern/remote_time.h>
_Atomic uint32_t bt_init_flag = 0;
extern void mach_bridge_add_timestamp(uint64_t remote_timestamp, uint64_t local_timestamp);
extern void bt_calibration_thread_start(void);
extern void bt_params_add(struct bt_params *params);
void
mach_bridge_init_timestamp(void)
{
/* This function should be called only once by the driver
* implementing the interrupt handler for receiving timestamps */
if (os_atomic_load(&bt_init_flag, relaxed)) {
return;
}
os_atomic_store(&bt_init_flag, 1, release);
/* Start the kernel thread only after all the locks have been initialized */
bt_calibration_thread_start();
}
/*
* Conditions: Should be called from primary interrupt context
*/
void
mach_bridge_recv_timestamps(uint64_t remoteTimestamp, uint64_t localTimestamp)
{
assert(ml_at_interrupt_context() == TRUE);
/* Ensure the locks have been initialized */
if (!os_atomic_load(&bt_init_flag, acquire)) {
panic("%s called before mach_bridge_init_timestamp", __func__);
return;
}
KDBG(MACHDBG_CODE(DBG_MACH_CLOCK, MACH_BRIDGE_RCV_TS), localTimestamp, remoteTimestamp);
lck_spin_lock(&bt_spin_lock);
mach_bridge_add_timestamp(remoteTimestamp, localTimestamp);
lck_spin_unlock(&bt_spin_lock);
return;
}
/*
* This function is used to set parameters, calculated externally,
* needed for mach_bridge_remote_time.
*/
void
mach_bridge_set_params(uint64_t local_timestamp, uint64_t remote_timestamp, double rate)
{
/* Ensure the locks have been initialized */
if (!os_atomic_load(&bt_init_flag, acquire)) {
panic("%s called before mach_bridge_init_timestamp", __func__);
return;
}
struct bt_params params = {};
params.base_local_ts = local_timestamp;
params.base_remote_ts = remote_timestamp;
params.rate = rate;
lck_spin_lock(&bt_ts_conversion_lock);
bt_params_add(¶ms);
lck_spin_unlock(&bt_ts_conversion_lock);
KDBG(MACHDBG_CODE(DBG_MACH_CLOCK, MACH_BRIDGE_TS_PARAMS), params.base_local_ts,
params.base_remote_ts, *(uint64_t *)((void *)¶ms.rate));
}