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163 lines
7.1 KiB
C
163 lines
7.1 KiB
C
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/*
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* Copyright (c) 2003-2007 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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/*
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* Virtual memory map purgeable object definitions.
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* Objects that will be needed in the future (forward cached objects) should be queued LIFO.
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* Objects that have been used and are cached for reuse (backward cached) should be queued FIFO.
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* Every user of purgeable memory is entitled to using the highest volatile group (7).
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* Only if a client wants some of its objects to definitely be purged earlier, it can put those in
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* another group. This could be used to make all FIFO objects (in the lower group) go away before
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* any LIFO objects (in the higher group) go away.
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* Objects that should not get any chance to stay around can be marked as "obsolete". They will
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* be emptied before any other objects or pages are reclaimed. Obsolete objects are not emptied
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* in any particular order.
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* 'purgeable' is recognized as the correct spelling. For historical reasons, definitions
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* in this file are spelled 'purgable'.
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*/
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#ifndef _MACH_VM_PURGABLE_H_
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#define _MACH_VM_PURGABLE_H_
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/*
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* Types defined:
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*
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* vm_purgable_t purgeable object control codes.
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*/
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typedef int vm_purgable_t;
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/*
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* Enumeration of valid values for vm_purgable_t.
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*/
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#define VM_PURGABLE_SET_STATE ((vm_purgable_t) 0) /* set state of purgeable object */
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#define VM_PURGABLE_GET_STATE ((vm_purgable_t) 1) /* get state of purgeable object */
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#define VM_PURGABLE_PURGE_ALL ((vm_purgable_t) 2) /* purge all volatile objects now */
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#define VM_PURGABLE_SET_STATE_FROM_KERNEL ((vm_purgable_t) 3) /* set state from kernel */
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/*
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* Purgeable state:
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*
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* 31 15 14 13 12 11 10 8 7 6 5 4 3 2 1 0
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* +-----+--+-----+--+----+-+-+---+---+---+
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* | |NA|DEBUG| | GRP| |B|ORD| |STA|
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* +-----+--+-----+--+----+-+-+---+---+---+
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* " ": unused (i.e. reserved)
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* STA: purgeable state
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* see: VM_PURGABLE_NONVOLATILE=0 to VM_PURGABLE_DENY=3
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* ORD: order
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* see:VM_VOLATILE_ORDER_*
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* B: behavior
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* see: VM_PURGABLE_BEHAVIOR_*
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* GRP: group
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* see: VM_VOLATILE_GROUP_*
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* DEBUG: debug
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* see: VM_PURGABLE_DEBUG_*
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* NA: no aging
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* see: VM_PURGABLE_NO_AGING*
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*/
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#define VM_PURGABLE_NO_AGING_SHIFT 16
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#define VM_PURGABLE_NO_AGING_MASK (0x1 << VM_PURGABLE_NO_AGING_SHIFT)
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#define VM_PURGABLE_NO_AGING (0x1 << VM_PURGABLE_NO_AGING_SHIFT)
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#define VM_PURGABLE_DEBUG_SHIFT 12
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#define VM_PURGABLE_DEBUG_MASK (0x3 << VM_PURGABLE_DEBUG_SHIFT)
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#define VM_PURGABLE_DEBUG_EMPTY (0x1 << VM_PURGABLE_DEBUG_SHIFT)
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#define VM_PURGABLE_DEBUG_FAULT (0x2 << VM_PURGABLE_DEBUG_SHIFT)
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/*
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* Volatile memory ordering groups (group zero objects are purged before group 1, etc...
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* It is implementation dependent as to whether these groups are global or per-address space.
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* (for the moment, they are global).
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*/
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#define VM_VOLATILE_GROUP_SHIFT 8
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#define VM_VOLATILE_GROUP_MASK (7 << VM_VOLATILE_GROUP_SHIFT)
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#define VM_VOLATILE_GROUP_DEFAULT VM_VOLATILE_GROUP_0
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#define VM_VOLATILE_GROUP_0 (0 << VM_VOLATILE_GROUP_SHIFT)
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#define VM_VOLATILE_GROUP_1 (1 << VM_VOLATILE_GROUP_SHIFT)
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#define VM_VOLATILE_GROUP_2 (2 << VM_VOLATILE_GROUP_SHIFT)
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#define VM_VOLATILE_GROUP_3 (3 << VM_VOLATILE_GROUP_SHIFT)
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#define VM_VOLATILE_GROUP_4 (4 << VM_VOLATILE_GROUP_SHIFT)
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#define VM_VOLATILE_GROUP_5 (5 << VM_VOLATILE_GROUP_SHIFT)
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#define VM_VOLATILE_GROUP_6 (6 << VM_VOLATILE_GROUP_SHIFT)
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#define VM_VOLATILE_GROUP_7 (7 << VM_VOLATILE_GROUP_SHIFT)
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/*
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* Purgeable behavior
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* Within the same group, FIFO objects will be emptied before objects that are added later.
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* LIFO objects will be emptied after objects that are added later.
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* - Input only, not returned on state queries.
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*/
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#define VM_PURGABLE_BEHAVIOR_SHIFT 6
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#define VM_PURGABLE_BEHAVIOR_MASK (1 << VM_PURGABLE_BEHAVIOR_SHIFT)
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#define VM_PURGABLE_BEHAVIOR_FIFO (0 << VM_PURGABLE_BEHAVIOR_SHIFT)
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#define VM_PURGABLE_BEHAVIOR_LIFO (1 << VM_PURGABLE_BEHAVIOR_SHIFT)
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/*
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* Obsolete object.
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* Disregard volatile group, and put object into obsolete queue instead, so it is the next object
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* to be purged.
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* - Input only, not returned on state queries.
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*/
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#define VM_PURGABLE_ORDERING_SHIFT 5
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#define VM_PURGABLE_ORDERING_MASK (1 << VM_PURGABLE_ORDERING_SHIFT)
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#define VM_PURGABLE_ORDERING_OBSOLETE (1 << VM_PURGABLE_ORDERING_SHIFT)
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#define VM_PURGABLE_ORDERING_NORMAL (0 << VM_PURGABLE_ORDERING_SHIFT)
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/*
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* Obsolete parameter - do not use
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*/
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#define VM_VOLATILE_ORDER_SHIFT 4
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#define VM_VOLATILE_ORDER_MASK (1 << VM_VOLATILE_ORDER_SHIFT)
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#define VM_VOLATILE_MAKE_FIRST_IN_GROUP (1 << VM_VOLATILE_ORDER_SHIFT)
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#define VM_VOLATILE_MAKE_LAST_IN_GROUP (0 << VM_VOLATILE_ORDER_SHIFT)
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/*
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* Valid states of a purgeable object.
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*/
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#define VM_PURGABLE_STATE_MIN 0 /* minimum purgeable object state value */
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#define VM_PURGABLE_STATE_MAX 3 /* maximum purgeable object state value */
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#define VM_PURGABLE_STATE_MASK 3 /* mask to separate state from group */
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#define VM_PURGABLE_NONVOLATILE 0 /* purgeable object is non-volatile */
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#define VM_PURGABLE_VOLATILE 1 /* purgeable object is volatile */
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#define VM_PURGABLE_EMPTY 2 /* purgeable object is volatile and empty */
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#define VM_PURGABLE_DENY 3 /* (mark) object not purgeable */
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#define VM_PURGABLE_ALL_MASKS (VM_PURGABLE_STATE_MASK | \
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VM_VOLATILE_ORDER_MASK | \
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VM_PURGABLE_ORDERING_MASK | \
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VM_PURGABLE_BEHAVIOR_MASK | \
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VM_VOLATILE_GROUP_MASK | \
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VM_PURGABLE_DEBUG_MASK | \
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VM_PURGABLE_NO_AGING_MASK)
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#endif /* _MACH_VM_PURGABLE_H_ */
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