osfmk/arm64/machine_machdep.h

   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_ */