libsyscall/mach/mach_init.c

   1 /*
   2  * Copyright (c) 1999-2012 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 /*
  29  * Mach Operating System
  30  * Copyright (c) 1991,1990,1989,1988,1987 Carnegie Mellon University
  31  * All Rights Reserved.
  32  *
  33  * Permission to use, copy, modify and distribute this software and its
  34  * documentation is hereby granted, provided that both the copyright
  35  * notice and this permission notice appear in all copies of the
  36  * software, derivative works or modified versions, and any portions
  37  * thereof, and that both notices appear in supporting documentation.
  38  *
  39  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  40  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  41  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  42  *
  43  * Carnegie Mellon requests users of this software to return to
  44  *
  45  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  46  *  School of Computer Science
  47  *  Carnegie Mellon University
  48  *  Pittsburgh PA 15213-3890
  49  *
  50  * any improvements or extensions that they make and grant Carnegie Mellon
  51  * the rights to redistribute these changes.
  52  */
  53
  54 #include <mach/mach.h>
  55 #include <mach/boolean.h>
  56 #include <mach/machine/ndr_def.h>
  57 #include <mach/mach_traps.h>
  58 #include <mach/mach_host.h>
  59 #include <mach/mach_init.h>
  60 #include <mach/vm_param.h>
  61 #include <machine/cpu_capabilities.h>
  62 #include <stdbool.h>
  63 #include "externs.h"
  64
  65 mach_port_t bootstrap_port = MACH_PORT_NULL;
  66 mach_port_t mach_task_self_ = MACH_PORT_NULL;
  67 #ifdef __i386__
  68 mach_port_t mach_host_self_ = MACH_PORT_NULL;
  69 #endif
  70 extern mach_port_t _task_reply_port;
  71
  72 vm_size_t vm_kernel_page_size = 0;
  73 vm_size_t vm_kernel_page_mask = 0;
  74 int vm_kernel_page_shift = 0;
  75
  76 vm_size_t vm_page_size = 0;
  77 vm_size_t vm_page_mask = 0;
  78 int vm_page_shift = 0;
  79
  80 int mach_init(void);
  81 int _mach_fork_child(void);
  82
  83 static void mach_init_doit(void);
  84
  85 extern void _pthread_set_self(void *);
  86 extern void _init_cpu_capabilities(void);
  87
  88 kern_return_t
  89 host_page_size(__unused host_t host, vm_size_t *out_page_size)
  90 {
  91         *out_page_size = vm_kernel_page_size;
  92         return KERN_SUCCESS;
  93 }
  94
  95 /*
  96  * mach_init() must be called explicitly in static executables (including dyld).
  97  * called by libSystem_initializer() in dynamic executables
  98  */
  99 int
 100 mach_init(void)
 101 {
 102         static bool mach_init_inited = false;
 103         if (!mach_init_inited) {
 104                 mach_init_doit();
 105                 mach_init_inited = true;
 106         }
 107         return 0;
 108 }
 109
 110 // called by libSystem_atfork_child()
 111 int
 112 _mach_fork_child(void)
 113 {
 114         mach_init_doit();
 115         return 0;
 116 }
 117
 118 #if defined(__arm__) || defined(__arm64__)
 119 #if !defined(_COMM_PAGE_USER_PAGE_SHIFT_64) && defined(_COMM_PAGE_UNUSED0)
 120 #define _COMM_PAGE_USER_PAGE_SHIFT_32 (_COMM_PAGE_UNUSED0)
 121 #define _COMM_PAGE_USER_PAGE_SHIFT_64 (_COMM_PAGE_UNUSED0+1)
 122 #endif
 123 #endif
 124
 125 void
 126 mach_init_doit(void)
 127 {
 128         // Initialize cached mach ports defined in mach_init.h
 129         mach_task_self_ = task_self_trap();
 130         _task_reply_port = mach_reply_port();
 131
 132         if (vm_kernel_page_shift == 0) {
 133 #ifdef  _COMM_PAGE_KERNEL_PAGE_SHIFT
 134                 vm_kernel_page_shift = *(uint8_t*) _COMM_PAGE_KERNEL_PAGE_SHIFT;
 135                 vm_kernel_page_size = 1 << vm_kernel_page_shift;
 136                 vm_kernel_page_mask = vm_kernel_page_size - 1;
 137 #else
 138                 vm_kernel_page_size = PAGE_SIZE;
 139                 vm_kernel_page_mask = PAGE_MASK;
 140                 vm_kernel_page_shift = PAGE_SHIFT;
 141 #endif /* _COMM_PAGE_KERNEL_PAGE_SHIFT */
 142         }
 143
 144         if (vm_page_shift == 0) {
 145 #if defined(__arm64__)
 146                 vm_page_shift = *(uint8_t*) _COMM_PAGE_USER_PAGE_SHIFT_64;
 147 #elif defined(__arm__)
 148                 vm_page_shift = *(uint8_t*) _COMM_PAGE_USER_PAGE_SHIFT_32;
 149 #else
 150                 vm_page_shift = vm_kernel_page_shift;
 151 #endif
 152                 vm_page_size = 1 << vm_page_shift;
 153                 vm_page_mask = vm_page_size - 1;
 154         }
 155
 156         _init_cpu_capabilities();
 157         _pthread_set_self(0);
 158 }