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