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 | #ifndef _MACHDEP_INTERNAL_H_ |
29 | #define _MACHDEP_INTERNAL_H_ |
30 | |
31 | /* We cache the current cthread pointer in the high bits of TPIDRRO_EL0 and |
32 | * the current CPU number in the low bits. The cthread pointer must be aligned |
33 | * sufficiently that the maximum CPU number will fit. |
34 | * |
35 | * NOTE: Keep this in sync with libsyscall/os/tsd.h, specifically _os_cpu_number() |
36 | */ |
37 | |
38 | #define MACHDEP_CTHREAD_ALIGNMENT (1 << 3) |
39 | #define MACHDEP_CPUNUM_MASK (MACHDEP_CTHREAD_ALIGNMENT - 1) |
40 | #define MACHDEP_CTHREAD_MASK (~MACHDEP_CPUNUM_MASK) |
41 | |
42 | #endif /* _MACHDEP_INTERNAL_H_ */ |
43 | |