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54 lines
2.2 KiB
C
54 lines
2.2 KiB
C
/*
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* Copyright (c) 2000-2013 Apple Inc. All rights reserved.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
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*
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* This file contains Original Code and/or Modifications of Original Code
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* as defined in and that are subject to the Apple Public Source License
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* Version 2.0 (the 'License'). You may not use this file except in
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* compliance with the License. The rights granted to you under the License
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* may not be used to create, or enable the creation or redistribution of,
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* unlawful or unlicensed copies of an Apple operating system, or to
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* circumvent, violate, or enable the circumvention or violation of, any
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* terms of an Apple operating system software license agreement.
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*
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* Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this file.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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* Please see the License for the specific language governing rights and
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* limitations under the License.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
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*/
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#include <vm/vm_page.h>
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#define VM_GHOST_OFFSET_BITS 39
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#define VM_GHOST_OFFSET_MASK 0x7FFFFFFFFF
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#define VM_GHOST_PAGES_PER_ENTRY 4
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#define VM_GHOST_PAGE_MASK 0x3
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#define VM_GHOST_PAGE_SHIFT 2
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#define VM_GHOST_INDEX_BITS (64 - VM_GHOST_OFFSET_BITS - VM_GHOST_PAGES_PER_ENTRY)
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struct vm_ghost {
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uint64_t g_next_index:VM_GHOST_INDEX_BITS,
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g_pages_held:VM_GHOST_PAGES_PER_ENTRY,
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g_obj_offset:VM_GHOST_OFFSET_BITS;
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uint32_t g_obj_id;
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} __attribute__((packed));
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typedef struct vm_ghost *vm_ghost_t;
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extern void vm_phantom_cache_init(void);
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extern void vm_phantom_cache_add_ghost(vm_page_t);
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extern vm_ghost_t vm_phantom_cache_lookup_ghost(vm_page_t, uint32_t);
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extern void vm_phantom_cache_update(vm_page_t);
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extern boolean_t vm_phantom_cache_check_pressure(void);
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extern void vm_phantom_cache_restart_sample(void);
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