1/*
 2 * Copyright (c) 2013 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#ifndef _VM_PAGE_SIZE_H_
30#define _VM_PAGE_SIZE_H_
31
32#include <Availability.h>
33#include <mach/mach_types.h>
34#include <sys/cdefs.h>
35
36__BEGIN_DECLS
37
38/*
39 *	Globally interesting numbers.
40 *	These macros assume vm_page_size is a power-of-2.
41 */
42extern  vm_size_t       vm_page_size;
43extern  vm_size_t       vm_page_mask;
44extern  int             vm_page_shift;
45
46/*
47 *	These macros assume vm_page_size is a power-of-2.
48 */
49#define trunc_page(x)   ((x) & (~(vm_page_size - 1)))
50#define round_page(x)   trunc_page((x) + (vm_page_size - 1))
51
52/*
53 *	Page-size rounding macros for the fixed-width VM types.
54 */
55#define mach_vm_trunc_page(x) ((mach_vm_offset_t)(x) & ~((signed)vm_page_mask))
56#define mach_vm_round_page(x) (((mach_vm_offset_t)(x) + vm_page_mask) & ~((signed)vm_page_mask))
57
58
59extern  vm_size_t       vm_kernel_page_size     __OSX_AVAILABLE_STARTING(__MAC_10_9, __IPHONE_7_0);
60extern  vm_size_t       vm_kernel_page_mask     __OSX_AVAILABLE_STARTING(__MAC_10_9, __IPHONE_7_0);
61extern  int             vm_kernel_page_shift    __OSX_AVAILABLE_STARTING(__MAC_10_9, __IPHONE_7_0);
62
63#define trunc_page_kernel(x)   ((x) & (~vm_kernel_page_mask))
64#define round_page_kernel(x)   trunc_page_kernel((x) + vm_kernel_page_mask)
65
66__END_DECLS
67
68#endif