X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/39236c6e673c41db228275375ab7fdb0f837b292..c6bf4f310a33a9262d455ea4d3f0630b1255e3fe:/libsyscall/mach/mach_init.c

diff --git a/libsyscall/mach/mach_init.c b/libsyscall/mach/mach_init.c
index 19e87120e..0c832bfbc 100644
--- 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.
  */
@@ -58,6 +58,7 @@
 #include <mach/mach_host.h>
 #include <mach/mach_init.h>
 #include <mach/vm_param.h>
+#include <machine/cpu_capabilities.h>
 #include <stdbool.h>
 #include "externs.h"
 
@@ -68,13 +69,13 @@ mach_port_t mach_host_self_ = MACH_PORT_NULL;
 #endif
 extern mach_port_t _task_reply_port;
 
-vm_size_t vm_kernel_page_size = KERNEL_PAGE_SIZE;
-vm_size_t vm_kernel_page_mask = KERNEL_PAGE_MASK;
-int vm_kernel_page_shift = KERNEL_PAGE_SHIFT;
+vm_size_t vm_kernel_page_size = 0;
+vm_size_t vm_kernel_page_mask = 0;
+int vm_kernel_page_shift = 0;
 
-vm_size_t vm_page_size = PAGE_SIZE;
-vm_size_t vm_page_mask = PAGE_MASK;
-int vm_page_shift = PAGE_SHIFT;
+vm_size_t vm_page_size = 0;
+vm_size_t vm_page_mask = 0;
+int vm_page_shift = 0;
 
 int mach_init(void);
 int _mach_fork_child(void);
@@ -87,11 +88,11 @@ extern void _init_cpu_capabilities(void);
 kern_return_t
 host_page_size(__unused host_t host, vm_size_t *out_page_size)
 {
-	*out_page_size = PAGE_SIZE;
+	*out_page_size = vm_kernel_page_size;
 	return KERN_SUCCESS;
 }
 
-/* 
+/*
  * mach_init() must be called explicitly in static executables (including dyld).
  * called by libSystem_initializer() in dynamic executables
  */
@@ -114,6 +115,13 @@ _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
+
 void
 mach_init_doit(void)
 {
@@ -121,6 +129,30 @@ mach_init_doit(void)
 	mach_task_self_ = task_self_trap();
 	_task_reply_port = mach_reply_port();
 
+	if (vm_kernel_page_shift == 0) {
+#ifdef  _COMM_PAGE_KERNEL_PAGE_SHIFT
+		vm_kernel_page_shift = *(uint8_t*) _COMM_PAGE_KERNEL_PAGE_SHIFT;
+		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) {
+#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
+		vm_page_shift = vm_kernel_page_shift;
+#endif
+		vm_page_size = 1 << vm_page_shift;
+		vm_page_mask = vm_page_size - 1;
+	}
+
 	_init_cpu_capabilities();
 	_pthread_set_self(0);
 }