/*
- * Copyright (c) 2003 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2003-2007 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
*/
/*
- * Virtual memory map purgable object definitions.
- *
+ * Virtual memory map purgeable object definitions.
+ * Objects that will be needed in the future (forward cached objects) should be queued LIFO.
+ * Objects that have been used and are cached for reuse (backward cached) should be queued FIFO.
+ * Every user of purgeable memory is entitled to using the highest volatile group (7).
+ * Only if a client wants some of its objects to definitely be purged earlier, it can put those in
+ * another group. This could be used to make all FIFO objects (in the lower group) go away before
+ * any LIFO objects (in the higher group) go away.
+ * Objects that should not get any chance to stay around can be marked as "obsolete". They will
+ * be emptied before any other objects or pages are reclaimed. Obsolete objects are not emptied
+ * in any particular order.
+ * 'purgeable' is recognized as the correct spelling. For historical reasons, definitions
+ * in this file are spelled 'purgable'.
*/
#ifndef _MACH_VM_PURGABLE_H_
/*
* Types defined:
*
- * vm_purgable_t purgable object control codes.
+ * vm_purgable_t purgeable object control codes.
*/
typedef int vm_purgable_t;
/*
* Enumeration of valid values for vm_purgable_t.
*/
-#define VM_PURGABLE_SET_STATE ((vm_purgable_t) 0) /* set state of purgable object */
-#define VM_PURGABLE_GET_STATE ((vm_purgable_t) 1) /* get state of purgable object */
+#define VM_PURGABLE_SET_STATE ((vm_purgable_t) 0) /* set state of purgeable object */
+#define VM_PURGABLE_GET_STATE ((vm_purgable_t) 1) /* get state of purgeable object */
+#define VM_PURGABLE_PURGE_ALL ((vm_purgable_t) 2) /* purge all volatile objects now */
+
+#define VM_PURGABLE_DEBUG_SHIFT 12
+#define VM_PURGABLE_DEBUG_MASK (0x3 << VM_PURGABLE_DEBUG_SHIFT)
+#define VM_PURGABLE_DEBUG_EMPTY (0x1 << VM_PURGABLE_DEBUG_SHIFT)
+#define VM_PURGABLE_DEBUG_FAULT (0x2 << VM_PURGABLE_DEBUG_SHIFT)
+
+/*
+ * Volatile memory ordering groups (group zero objects are purged before group 1, etc...
+ * It is implementation dependent as to whether these groups are global or per-address space.
+ * (for the moment, they are global).
+ */
+#define VM_VOLATILE_GROUP_SHIFT 8
+#define VM_VOLATILE_GROUP_MASK (7 << VM_VOLATILE_GROUP_SHIFT)
+#define VM_VOLATILE_GROUP_DEFAULT VM_VOLATILE_GROUP_7
+
+#define VM_VOLATILE_GROUP_0 (0 << VM_VOLATILE_GROUP_SHIFT)
+#define VM_VOLATILE_GROUP_1 (1 << VM_VOLATILE_GROUP_SHIFT)
+#define VM_VOLATILE_GROUP_2 (2 << VM_VOLATILE_GROUP_SHIFT)
+#define VM_VOLATILE_GROUP_3 (3 << VM_VOLATILE_GROUP_SHIFT)
+#define VM_VOLATILE_GROUP_4 (4 << VM_VOLATILE_GROUP_SHIFT)
+#define VM_VOLATILE_GROUP_5 (5 << VM_VOLATILE_GROUP_SHIFT)
+#define VM_VOLATILE_GROUP_6 (6 << VM_VOLATILE_GROUP_SHIFT)
+#define VM_VOLATILE_GROUP_7 (7 << VM_VOLATILE_GROUP_SHIFT)
+
+/*
+ * Purgeable behavior
+ * Within the same group, FIFO objects will be emptied before objects that are added later.
+ * LIFO objects will be emptied after objects that are added later.
+ * - Input only, not returned on state queries.
+ */
+#define VM_PURGABLE_BEHAVIOR_SHIFT 6
+#define VM_PURGABLE_BEHAVIOR_MASK (1 << VM_PURGABLE_BEHAVIOR_SHIFT)
+#define VM_PURGABLE_BEHAVIOR_FIFO (0 << VM_PURGABLE_BEHAVIOR_SHIFT)
+#define VM_PURGABLE_BEHAVIOR_LIFO (1 << VM_PURGABLE_BEHAVIOR_SHIFT)
+
+/*
+ * Obsolete object.
+ * Disregard volatile group, and put object into obsolete queue instead, so it is the next object
+ * to be purged.
+ * - Input only, not returned on state queries.
+ */
+#define VM_PURGABLE_ORDERING_SHIFT 5
+#define VM_PURGABLE_ORDERING_MASK (1 << VM_PURGABLE_ORDERING_SHIFT)
+#define VM_PURGABLE_ORDERING_OBSOLETE (1 << VM_PURGABLE_ORDERING_SHIFT)
+#define VM_PURGABLE_ORDERING_NORMAL (0 << VM_PURGABLE_ORDERING_SHIFT)
+
+
+/*
+ * Obsolete parameter - do not use
+ */
+#define VM_VOLATILE_ORDER_SHIFT 4
+#define VM_VOLATILE_ORDER_MASK (1 << VM_VOLATILE_ORDER_SHIFT)
+#define VM_VOLATILE_MAKE_FIRST_IN_GROUP (1 << VM_VOLATILE_ORDER_SHIFT)
+#define VM_VOLATILE_MAKE_LAST_IN_GROUP (0 << VM_VOLATILE_ORDER_SHIFT)
/*
- * Valid states of a purgable object.
+ * Valid states of a purgeable object.
*/
-#define VM_PURGABLE_STATE_MIN 0 /* minimum purgable object state value */
-#define VM_PURGABLE_STATE_MAX 2 /* maximum purgable object state value */
+#define VM_PURGABLE_STATE_MIN 0 /* minimum purgeable object state value */
+#define VM_PURGABLE_STATE_MAX 3 /* maximum purgeable object state value */
+#define VM_PURGABLE_STATE_MASK 3 /* mask to separate state from group */
-#define VM_PURGABLE_NONVOLATILE 0 /* purgable object is non-volatile */
-#define VM_PURGABLE_VOLATILE 1 /* purgable object is volatile */
-#define VM_PURGABLE_EMPTY 2 /* purgable object is volatile and empty */
+#define VM_PURGABLE_NONVOLATILE 0 /* purgeable object is non-volatile */
+#define VM_PURGABLE_VOLATILE 1 /* purgeable object is volatile */
+#define VM_PURGABLE_EMPTY 2 /* purgeable object is volatile and empty */
+#define VM_PURGABLE_DENY 3 /* (mark) object not purgeable */
+#define VM_PURGABLE_ALL_MASKS (VM_PURGABLE_STATE_MASK | \
+ VM_VOLATILE_ORDER_MASK | \
+ VM_PURGABLE_ORDERING_MASK | \
+ VM_PURGABLE_BEHAVIOR_MASK | \
+ VM_VOLATILE_GROUP_MASK | \
+ VM_PURGABLE_DEBUG_MASK)
#endif /* _MACH_VM_PURGABLE_H_ */
projects / apple / xnu.git / blobdiff