1 /* 2 * Copyright (c) 2000-2013 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 #include <vm/vm_page.h> 30 31 #define VM_GHOST_OFFSET_BITS 39 32 #define VM_GHOST_OFFSET_MASK 0x7FFFFFFFFF 33 #define VM_GHOST_PAGES_PER_ENTRY 4 34 #define VM_GHOST_PAGE_MASK 0x3 35 #define VM_GHOST_PAGE_SHIFT 2 36 #define VM_GHOST_INDEX_BITS (64 - VM_GHOST_OFFSET_BITS - VM_GHOST_PAGES_PER_ENTRY) 37 38 struct vm_ghost { 39 uint64_t g_next_index:VM_GHOST_INDEX_BITS, 40 g_pages_held:VM_GHOST_PAGES_PER_ENTRY, 41 g_obj_offset:VM_GHOST_OFFSET_BITS; 42 uint32_t g_obj_id; 43 } __attribute__((packed)); 44 45 typedef struct vm_ghost *vm_ghost_t; 46 47 48 extern void vm_phantom_cache_init(void); 49 extern void vm_phantom_cache_add_ghost(vm_page_t); 50 extern vm_ghost_t vm_phantom_cache_lookup_ghost(vm_page_t, uint32_t); 51 extern void vm_phantom_cache_update(vm_page_t); 52 extern boolean_t vm_phantom_cache_check_pressure(void); 53 extern void vm_phantom_cache_restart_sample(void); 54