/* * Copyright (c) 2014 Apple Computer, Inc. All rights reserved. * * @APPLE_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 * compliance with the License. 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, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * 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_LICENSE_HEADER_END@ */ #include "cross_link.h" /********************************************************************* * Module Internal Variables *********************************************************************/ static boolean_t __sCrossLinkEnabled = FALSE; static vm_size_t __sCrossLinkPageSize = 0; /********************************************************************* *********************************************************************/ boolean_t isCrossLinking(void) { return __sCrossLinkEnabled; } /********************************************************************* *********************************************************************/ boolean_t setCrossLinkPageSize(vm_size_t crossLinkPageSize) { // verify radix 2 if ((crossLinkPageSize != 0) && ((crossLinkPageSize & (crossLinkPageSize - 1)) == 0)) { __sCrossLinkPageSize = crossLinkPageSize; __sCrossLinkEnabled = TRUE; return TRUE; } else { return FALSE; } } /********************************************************************* *********************************************************************/ vm_size_t getEffectivePageSize(void) { if (__sCrossLinkEnabled) { return __sCrossLinkPageSize; } else { return PAGE_SIZE; } } /********************************************************************* *********************************************************************/ vm_offset_t roundPageCrossSafe(vm_offset_t offset) { // __sCrossLinkPageSize is checked for power of 2 above if (__sCrossLinkEnabled) { return (offset + (__sCrossLinkPageSize - 1)) & (~(__sCrossLinkPageSize - 1)); } else { return round_page(offset); } } /********************************************************************* *********************************************************************/ mach_vm_offset_t roundPageCrossSafeFixedWidth(mach_vm_offset_t offset) { // __sCrossLinkPageSize is checked for power of 2 above if (__sCrossLinkEnabled) { return (offset + (__sCrossLinkPageSize - 1)) & (~(__sCrossLinkPageSize - 1)); } else { return mach_vm_round_page(offset); } }