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59 * File: mach/vm_prot.h
60 * Author: Avadis Tevanian, Jr., Michael Wayne Young
62 * Virtual memory protection definitions.
66 #ifndef _MACH_VM_PROT_H_
67 #define _MACH_VM_PROT_H_
72 * vm_prot_t VM protection values.
75 typedef int vm_prot_t
;
78 * Protection values, defined as bits within the vm_prot_t type
81 #define VM_PROT_NONE ((vm_prot_t) 0x00)
83 #define VM_PROT_READ ((vm_prot_t) 0x01) /* read permission */
84 #define VM_PROT_WRITE ((vm_prot_t) 0x02) /* write permission */
85 #define VM_PROT_EXECUTE ((vm_prot_t) 0x04) /* execute permission */
88 * The default protection for newly-created virtual memory
91 #define VM_PROT_DEFAULT (VM_PROT_READ|VM_PROT_WRITE)
94 * The maximum privileges possible, for parameter checking.
97 #define VM_PROT_ALL (VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE)
100 * An invalid protection value.
101 * Used only by memory_object_lock_request to indicate no change
102 * to page locks. Using -1 here is a bad idea because it
103 * looks like VM_PROT_ALL and then some.
106 #define VM_PROT_NO_CHANGE ((vm_prot_t) 0x08)
109 * When a caller finds that he cannot obtain write permission on a
110 * mapped entry, the following flag can be used. The entry will
111 * be made "needs copy" effectively copying the object (using COW),
112 * and write permission will be added to the maximum protections
113 * for the associated entry.
116 #define VM_PROT_COPY ((vm_prot_t) 0x10)
120 * Another invalid protection value.
121 * Used only by memory_object_data_request upon an object
122 * which has specified a copy_call copy strategy. It is used
123 * when the kernel wants a page belonging to a copy of the
124 * object, and is only asking the object as a result of
125 * following a shadow chain. This solves the race between pages
126 * being pushed up by the memory manager and the kernel
127 * walking down the shadow chain.
130 #define VM_PROT_WANTS_COPY ((vm_prot_t) 0x10)
134 * The caller wants this memory region treated as if it had a valid
138 #define VM_PROT_TRUSTED ((vm_prot_t) 0x20)
142 * Another invalid protection value.
143 * Indicates that the other protection bits are to be applied as a mask
144 * against the actual protection bits of the map entry.
146 #define VM_PROT_IS_MASK ((vm_prot_t) 0x40)
149 #define VM_PROT_MEMORY_TAG_MASK 0xFF000000
150 #define VM_PROT_MEMORY_TAG_SHIFT 24
151 #define VM_PROT_MEMORY_TAG(x) (((x) >> VM_PROT_MEMORY_TAG_SHIFT) & 0xFF)
152 #define VM_PROT_MEMORY_TAG_MAKE(x) (((x) & 0xFF) << VM_PROT_MEMORY_TAG_SHIFT)
154 #endif /* _MACH_VM_PROT_H_ */