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59 #ifndef VM_VM_EXTERNAL_H_
60 #define VM_VM_EXTERNAL_H_
62 #include <mach/boolean.h>
63 #include <mach/vm_types.h>
64 #include <mach/machine/vm_types.h>
67 * External page management hint technology
69 * The data structure exported by this module maintains
70 * a (potentially incomplete) map of the pages written
71 * to external storage for a range of virtual memory.
74 typedef char *vm_external_map_t
;
75 #define VM_EXTERNAL_NULL ((char *) 0)
78 * The states that may be recorded for a page of external storage.
81 typedef int vm_external_state_t
;
82 #define VM_EXTERNAL_STATE_EXISTS 1
83 #define VM_EXTERNAL_STATE_UNKNOWN 2
84 #define VM_EXTERNAL_STATE_ABSENT 3
89 #define stob(s) ((atop_64((s)) + 07) >> 3)
92 * Routines exported by this module.
94 /* Initialize the module */
95 extern void vm_external_module_initialize(void);
98 extern vm_external_map_t
vm_external_create(
99 /* Create a vm_external_map_t */
100 vm_object_size_t size
);
102 extern void vm_external_destroy(
104 vm_external_map_t map
,
105 vm_object_size_t size
);
107 extern vm_object_size_t
vm_external_map_size(
108 /* Return size of map in bytes */
109 vm_object_size_t size
);
111 extern void vm_external_copy(
112 /* Copy one into another */
113 vm_external_map_t old_map
,
114 vm_object_size_t old_size
,
115 vm_external_map_t new_map
);
117 extern void vm_external_state_set(
118 /* Set state of a page to
119 * VM_EXTERNAL_STATE_EXISTS */
120 vm_external_map_t map
,
121 vm_object_offset_t offset
);
123 extern void vm_external_state_clr(
126 vm_external_map_t map
,
127 vm_object_offset_t offset
);
129 #define vm_external_state_get(map, offset) \
130 (((map) != VM_EXTERNAL_NULL) ? \
131 _vm_external_state_get((map), (offset)) : \
132 VM_EXTERNAL_STATE_UNKNOWN)
133 /* Retrieve the state for a
134 * given page, if known. */
136 extern vm_external_state_t
_vm_external_state_get(
138 vm_external_map_t map
,
139 vm_object_offset_t offset
);
141 boolean_t
vm_external_within(
142 /* Check if new object size
143 * fits in current map */
144 vm_object_size_t new_size
,
145 vm_object_size_t old_size
);
147 #endif /* VM_VM_EXTERNAL_H_ */