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 | { |
40 | uint64_t g_next_index:VM_GHOST_INDEX_BITS, |
41 | g_pages_held:VM_GHOST_PAGES_PER_ENTRY, |
42 | g_obj_offset:VM_GHOST_OFFSET_BITS; |
43 | uint32_t g_obj_id; |
44 | |
45 | } __attribute__((packed)); |
46 | |
47 | typedef struct vm_ghost *vm_ghost_t; |
48 | |
49 | |
50 | extern void vm_phantom_cache_init(void); |
51 | extern void vm_phantom_cache_add_ghost(vm_page_t); |
52 | extern vm_ghost_t vm_phantom_cache_lookup_ghost(vm_page_t, uint32_t); |
53 | extern void vm_phantom_cache_update(vm_page_t); |
54 | extern boolean_t vm_phantom_cache_check_pressure(void); |
55 | extern void vm_phantom_cache_restart_sample(void); |
56 | |