1 /* * Copyright (c) 2020 Apple Inc. All rights reserved.
2 *
3 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
4 *
5 * This file contains Original Code and/or Modifications of Original Code
6 * as defined in and that are subject to the Apple Public Source License
7 * Version 2.0 (the 'License'). You may not use this file except in
8 * compliance with the License. The rights granted to you under the License
9 * may not be used to create, or enable the creation or redistribution of,
10 * unlawful or unlicensed copies of an Apple operating system, or to
11 * circumvent, violate, or enable the circumvention or violation of, any
12 * terms of an Apple operating system software license agreement.
13 *
14 * Please obtain a copy of the License at
15 * http://www.opensource.apple.com/apsl/ and read it before using this file.
16 *
17 * The Original Code and all software distributed under the License are
18 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
19 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
20 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
22 * Please see the License for the specific language governing rights and
23 * limitations under the License.
24 *
25 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
26 */
27
28 #include <kern/assert.h>
29 #include <kern/cpu_data.h>
30 #include <kern/counter.h>
31 #include <kern/zalloc.h>
32 #include <machine/atomic.h>
33 #include <machine/machine_routines.h>
34 #include <machine/cpu_number.h>
35
36 OS_OVERLOADABLE
37 void
counter_add(scalable_counter_t * counter,uint64_t amount)38 counter_add(scalable_counter_t *counter, uint64_t amount)
39 {
40 os_atomic_add(zpercpu_get(*counter), amount, relaxed);
41 }
42
43 OS_OVERLOADABLE
44 void
counter_inc(scalable_counter_t * counter)45 counter_inc(scalable_counter_t *counter)
46 {
47 os_atomic_inc(zpercpu_get(*counter), relaxed);
48 }
49
50 OS_OVERLOADABLE
51 void
counter_dec(scalable_counter_t * counter)52 counter_dec(scalable_counter_t *counter)
53 {
54 os_atomic_dec(zpercpu_get(*counter), relaxed);
55 }
56
57 /*
58 * NB: On arm, the preemption disabled implementation is the same as
59 * the normal implementation. Otherwise we would need to enforce that
60 * callers never mix the interfaces for the same counter.
61 */
62 OS_OVERLOADABLE
63 void
counter_add_preemption_disabled(scalable_counter_t * counter,uint64_t amount)64 counter_add_preemption_disabled(scalable_counter_t *counter, uint64_t amount)
65 {
66 counter_add(counter, amount);
67 }
68
69 OS_OVERLOADABLE
70 void
counter_inc_preemption_disabled(scalable_counter_t * counter)71 counter_inc_preemption_disabled(scalable_counter_t *counter)
72 {
73 counter_inc(counter);
74 }
75
76 OS_OVERLOADABLE
77 void
counter_dec_preemption_disabled(scalable_counter_t * counter)78 counter_dec_preemption_disabled(scalable_counter_t *counter)
79 {
80 counter_dec(counter);
81 }
82