xnu-7195.50.7.100.1.tar.gz

[apple/xnu.git] / libsyscall / mach / mach_init.c

diff --git a/libsyscall/mach/mach_init.c b/libsyscall/mach/mach_init.c
index 90a42ceb5e41233668d9fca2e3f93ae51810727e..4206401a8d06e72c9453c104d63858a74628c04d 100644 (file)
--- a/libsyscall/mach/mach_init.c
+++ b/libsyscall/mach/mach_init.c
@@ -2,7 +2,7 @@
  * Copyright (c) 1999-2012 Apple Inc. All rights reserved.
  *
  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
- * 
+ *
  * This file contains Original Code and/or Modifications of Original Code
  * as defined in and that are subject to the Apple Public Source License
  * Version 2.0 (the 'License'). You may not use this file except in
@@ -11,10 +11,10 @@
  * unlawful or unlicensed copies of an Apple operating system, or to
  * circumvent, violate, or enable the circumvention or violation of, any
  * terms of an Apple operating system software license agreement.
- * 
+ *
  * Please obtain a copy of the License at
  * http://www.opensource.apple.com/apsl/ and read it before using this file.
- * 
+ *
  * The Original Code and all software distributed under the License are
  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
@@ -22,31 +22,31 @@
  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  * Please see the License for the specific language governing rights and
  * limitations under the License.
- * 
+ *
  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  */
-/* 
+/*
  * Mach Operating System
  * Copyright (c) 1991,1990,1989,1988,1987 Carnegie Mellon University
  * All Rights Reserved.
- * 
+ *
  * Permission to use, copy, modify and distribute this software and its
  * documentation is hereby granted, provided that both the copyright
  * notice and this permission notice appear in all copies of the
  * software, derivative works or modified versions, and any portions
  * thereof, and that both notices appear in supporting documentation.
- * 
+ *
  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
- * 
+ *
  * Carnegie Mellon requests users of this software to return to
- * 
+ *
  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  *  School of Computer Science
  *  Carnegie Mellon University
  *  Pittsburgh PA 15213-3890
- * 
+ *
  * any improvements or extensions that they make and grant Carnegie Mellon
  * the rights to redistribute these changes.
  */
@@ -92,7 +92,7 @@ host_page_size(__unused host_t host, vm_size_t *out_page_size)
        return KERN_SUCCESS;
 }
 
-/* 
+/*
  * mach_init() must be called explicitly in static executables (including dyld).
  * called by libSystem_initializer() in dynamic executables
  */
@@ -115,6 +115,18 @@ _mach_fork_child(void)
        return 0;
 }
 
+#if defined(__arm__) || defined(__arm64__)
+#if !defined(_COMM_PAGE_USER_PAGE_SHIFT_64) && defined(_COMM_PAGE_UNUSED0)
+#define _COMM_PAGE_USER_PAGE_SHIFT_32 (_COMM_PAGE_UNUSED0)
+#define _COMM_PAGE_USER_PAGE_SHIFT_64 (_COMM_PAGE_UNUSED0+1)
+#endif
+#endif
+
+#if defined(__x86_64__) || defined(__i386__)
+#define COMM_PAGE_KERNEL_PAGE_SHIFT_MIN_VERSION 14
+#else
+#define COMM_PAGE_KERNEL_PAGE_SHIFT_MIN_VERSION 3
+#endif
 
 void
 mach_init_doit(void)
@@ -124,19 +136,31 @@ mach_init_doit(void)
        _task_reply_port = mach_reply_port();
 
        if (vm_kernel_page_shift == 0) {
-#ifdef _COMM_PAGE_KERNEL_PAGE_SHIFT
+#if defined(__x86_64__) || defined(__i386__)
+               if ((*((uint16_t *)_COMM_PAGE_VERSION) >= COMM_PAGE_KERNEL_PAGE_SHIFT_MIN_VERSION)) {
+                       vm_kernel_page_shift = *(uint8_t*) _COMM_PAGE_KERNEL_PAGE_SHIFT;
+               } else {
+                       vm_kernel_page_shift = I386_PGSHIFT;
+               }
+#else
                vm_kernel_page_shift = *(uint8_t*) _COMM_PAGE_KERNEL_PAGE_SHIFT;
+#endif
                vm_kernel_page_size = 1 << vm_kernel_page_shift;
                vm_kernel_page_mask = vm_kernel_page_size - 1;
-#else
-               vm_kernel_page_size = PAGE_SIZE;
-               vm_kernel_page_mask = PAGE_MASK;
-               vm_kernel_page_shift = PAGE_SHIFT;
-#endif /* _COMM_PAGE_KERNEL_PAGE_SHIFT */
        }
-       
+
        if (vm_page_shift == 0) {
-               vm_page_shift = vm_kernel_page_shift;
+#if defined(__arm64__)
+               vm_page_shift = *(uint8_t*) _COMM_PAGE_USER_PAGE_SHIFT_64;
+#elif defined(__arm__)
+               vm_page_shift = *(uint8_t*) _COMM_PAGE_USER_PAGE_SHIFT_32;
+#else
+               if ((*((uint16_t *)_COMM_PAGE_VERSION) >= COMM_PAGE_KERNEL_PAGE_SHIFT_MIN_VERSION)) {
+                       vm_page_shift = *(uint8_t*) _COMM_PAGE_USER_PAGE_SHIFT_64;
+               } else {
+                       vm_page_shift = vm_kernel_page_shift;
+               }
+#endif
                vm_page_size = 1 << vm_page_shift;
                vm_page_mask = vm_page_size - 1;
        }