1*5c2921b0SApple OSS Distributions /* 2*5c2921b0SApple OSS Distributions * Copyright (c) 2000-2013 Apple Inc. All rights reserved. 3*5c2921b0SApple OSS Distributions * 4*5c2921b0SApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5*5c2921b0SApple OSS Distributions * 6*5c2921b0SApple OSS Distributions * This file contains Original Code and/or Modifications of Original Code 7*5c2921b0SApple OSS Distributions * as defined in and that are subject to the Apple Public Source License 8*5c2921b0SApple OSS Distributions * Version 2.0 (the 'License'). You may not use this file except in 9*5c2921b0SApple OSS Distributions * compliance with the License. The rights granted to you under the License 10*5c2921b0SApple OSS Distributions * may not be used to create, or enable the creation or redistribution of, 11*5c2921b0SApple OSS Distributions * unlawful or unlicensed copies of an Apple operating system, or to 12*5c2921b0SApple OSS Distributions * circumvent, violate, or enable the circumvention or violation of, any 13*5c2921b0SApple OSS Distributions * terms of an Apple operating system software license agreement. 14*5c2921b0SApple OSS Distributions * 15*5c2921b0SApple OSS Distributions * Please obtain a copy of the License at 16*5c2921b0SApple OSS Distributions * http://www.opensource.apple.com/apsl/ and read it before using this file. 17*5c2921b0SApple OSS Distributions * 18*5c2921b0SApple OSS Distributions * The Original Code and all software distributed under the License are 19*5c2921b0SApple OSS Distributions * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20*5c2921b0SApple OSS Distributions * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21*5c2921b0SApple OSS Distributions * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22*5c2921b0SApple OSS Distributions * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23*5c2921b0SApple OSS Distributions * Please see the License for the specific language governing rights and 24*5c2921b0SApple OSS Distributions * limitations under the License. 25*5c2921b0SApple OSS Distributions * 26*5c2921b0SApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27*5c2921b0SApple OSS Distributions */ 28*5c2921b0SApple OSS Distributions 29*5c2921b0SApple OSS Distributions #include <vm/vm_page.h> 30*5c2921b0SApple OSS Distributions 31*5c2921b0SApple OSS Distributions #define VM_GHOST_OFFSET_BITS 39 32*5c2921b0SApple OSS Distributions #define VM_GHOST_OFFSET_MASK 0x7FFFFFFFFF 33*5c2921b0SApple OSS Distributions #define VM_GHOST_PAGES_PER_ENTRY 4 34*5c2921b0SApple OSS Distributions #define VM_GHOST_PAGE_MASK 0x3 35*5c2921b0SApple OSS Distributions #define VM_GHOST_PAGE_SHIFT 2 36*5c2921b0SApple OSS Distributions #define VM_GHOST_INDEX_BITS (64 - VM_GHOST_OFFSET_BITS - VM_GHOST_PAGES_PER_ENTRY) 37*5c2921b0SApple OSS Distributions 38*5c2921b0SApple OSS Distributions struct vm_ghost { 39*5c2921b0SApple OSS Distributions uint64_t g_next_index:VM_GHOST_INDEX_BITS, 40*5c2921b0SApple OSS Distributions g_pages_held:VM_GHOST_PAGES_PER_ENTRY, 41*5c2921b0SApple OSS Distributions g_obj_offset:VM_GHOST_OFFSET_BITS; 42*5c2921b0SApple OSS Distributions uint32_t g_obj_id; 43*5c2921b0SApple OSS Distributions } __attribute__((packed)); 44*5c2921b0SApple OSS Distributions 45*5c2921b0SApple OSS Distributions typedef struct vm_ghost *vm_ghost_t; 46*5c2921b0SApple OSS Distributions 47*5c2921b0SApple OSS Distributions 48*5c2921b0SApple OSS Distributions extern void vm_phantom_cache_init(void); 49*5c2921b0SApple OSS Distributions extern void vm_phantom_cache_add_ghost(vm_page_t); 50*5c2921b0SApple OSS Distributions extern vm_ghost_t vm_phantom_cache_lookup_ghost(vm_page_t, uint32_t); 51*5c2921b0SApple OSS Distributions extern void vm_phantom_cache_update(vm_page_t); 52*5c2921b0SApple OSS Distributions extern boolean_t vm_phantom_cache_check_pressure(void); 53*5c2921b0SApple OSS Distributions extern void vm_phantom_cache_restart_sample(void); 54