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 |
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 |
45 | counter_inc(scalable_counter_t *counter) |
46 | { |
47 | os_atomic_inc(zpercpu_get(*counter), relaxed); |
48 | } |
49 | |
50 | OS_OVERLOADABLE |
51 | void |
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 |
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 |
71 | counter_inc_preemption_disabled(scalable_counter_t *counter) |
72 | { |
73 | counter_inc(counter); |
74 | } |
75 | |
76 | OS_OVERLOADABLE |
77 | void |
78 | counter_dec_preemption_disabled(scalable_counter_t *counter) |
79 | { |
80 | counter_dec(counter); |
81 | } |
82 | |