1 | /* |
2 | * Copyright (c) 2017 Apple Inc. All rights reserved. |
3 | * |
4 | * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ |
5 | * |
6 | * This file contains Original Code and/or Modifications of Original Code |
7 | * as defined in and that are subject to the Apple Public Source License |
8 | * Version 2.0 (the 'License'). You may not use this file except in |
9 | * compliance with the License. The rights granted to you under the License |
10 | * may not be used to create, or enable the creation or redistribution of, |
11 | * unlawful or unlicensed copies of an Apple operating system, or to |
12 | * circumvent, violate, or enable the circumvention or violation of, any |
13 | * terms of an Apple operating system software license agreement. |
14 | * |
15 | * Please obtain a copy of the License at |
16 | * http://www.opensource.apple.com/apsl/ and read it before using this file. |
17 | * |
18 | * The Original Code and all software distributed under the License are |
19 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER |
20 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
21 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, |
22 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. |
23 | * Please see the License for the specific language governing rights and |
24 | * limitations under the License. |
25 | * |
26 | * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ |
27 | */ |
28 | #include <kern/misc_protos.h> |
29 | #include <machine/atomic.h> |
30 | #include <mach/mach_time.h> |
31 | #include <mach/clock_types.h> |
32 | #include <kern/clock.h> |
33 | #include <kern/locks.h> |
34 | #include <arm64/machine_remote_time.h> |
35 | #include <sys/kdebug.h> |
36 | #include <arm/machine_routines.h> |
37 | #include <kern/remote_time.h> |
38 | |
39 | _Atomic uint32_t bt_init_flag = 0; |
40 | |
41 | extern void mach_bridge_add_timestamp(uint64_t remote_timestamp, uint64_t local_timestamp); |
42 | extern void bt_calibration_thread_start(void); |
43 | extern void bt_params_add(struct bt_params *params); |
44 | |
45 | void |
46 | mach_bridge_init_timestamp(void) |
47 | { |
48 | /* This function should be called only once by the driver |
49 | * implementing the interrupt handler for receiving timestamps */ |
50 | if (os_atomic_load(&bt_init_flag, relaxed)) { |
51 | return; |
52 | } |
53 | |
54 | os_atomic_store(&bt_init_flag, 1, release); |
55 | |
56 | /* Start the kernel thread only after all the locks have been initialized */ |
57 | bt_calibration_thread_start(); |
58 | } |
59 | |
60 | /* |
61 | * Conditions: Should be called from primary interrupt context |
62 | */ |
63 | void |
64 | mach_bridge_recv_timestamps(uint64_t remoteTimestamp, uint64_t localTimestamp) |
65 | { |
66 | assert(ml_at_interrupt_context() == TRUE); |
67 | |
68 | /* Ensure the locks have been initialized */ |
69 | if (!os_atomic_load(&bt_init_flag, acquire)) { |
70 | panic("%s called before mach_bridge_init_timestamp" , __func__); |
71 | return; |
72 | } |
73 | |
74 | KDBG(MACHDBG_CODE(DBG_MACH_CLOCK, MACH_BRIDGE_RCV_TS), localTimestamp, remoteTimestamp); |
75 | |
76 | lck_spin_lock(lck: &bt_spin_lock); |
77 | mach_bridge_add_timestamp(remote_timestamp: remoteTimestamp, local_timestamp: localTimestamp); |
78 | lck_spin_unlock(lck: &bt_spin_lock); |
79 | |
80 | return; |
81 | } |
82 | |
83 | /* |
84 | * This function is used to set parameters, calculated externally, |
85 | * needed for mach_bridge_remote_time. |
86 | */ |
87 | void |
88 | mach_bridge_set_params(uint64_t local_timestamp, uint64_t remote_timestamp, double rate) |
89 | { |
90 | /* Ensure the locks have been initialized */ |
91 | if (!os_atomic_load(&bt_init_flag, acquire)) { |
92 | panic("%s called before mach_bridge_init_timestamp" , __func__); |
93 | return; |
94 | } |
95 | |
96 | struct bt_params params = {}; |
97 | params.base_local_ts = local_timestamp; |
98 | params.base_remote_ts = remote_timestamp; |
99 | params.rate = rate; |
100 | lck_spin_lock(lck: &bt_ts_conversion_lock); |
101 | bt_params_add(params: ¶ms); |
102 | lck_spin_unlock(lck: &bt_ts_conversion_lock); |
103 | KDBG(MACHDBG_CODE(DBG_MACH_CLOCK, MACH_BRIDGE_TS_PARAMS), params.base_local_ts, |
104 | params.base_remote_ts, *(uint64_t *)((void *)¶ms.rate)); |
105 | } |
106 | |