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 */ 42 extern vm_size_t vm_page_size; 43 extern vm_size_t vm_page_mask; 44 extern 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 59 extern vm_size_t vm_kernel_page_size __OSX_AVAILABLE_STARTING(__MAC_10_9, __IPHONE_7_0); 60 extern vm_size_t vm_kernel_page_mask __OSX_AVAILABLE_STARTING(__MAC_10_9, __IPHONE_7_0); 61 extern 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 69