Augustin Cavalier
76af6f4c98
They mostly contained descriptions of functions' operations, not what they're for, so they weren't so useful. I've added some of the remarks they had (or ones with a similar purpose) inline as documentation comments, and deleted the rest.
54 lines
1.7 KiB
C
54 lines
1.7 KiB
C
/*
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* Copyright 2002-2008, Axel Dörfler, [email protected]. All rights reserved.
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* Distributed under the terms of the MIT License.
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*
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* Copyright 2001-2002, Travis Geiselbrecht. All rights reserved.
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* Distributed under the terms of the NewOS License.
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*/
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#ifndef _SYSTEM_VM_DEFS_H
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#define _SYSTEM_VM_DEFS_H
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#include <OS.h>
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#define B_USER_PROTECTION \
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(B_READ_AREA | B_WRITE_AREA | B_EXECUTE_AREA | B_STACK_AREA)
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#define B_KERNEL_PROTECTION \
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(B_KERNEL_READ_AREA | B_KERNEL_WRITE_AREA | B_KERNEL_EXECUTE_AREA \
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| B_KERNEL_STACK_AREA)
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// TODO: These aren't really protection flags, but since the "protection"
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// field is the only flag field, we currently use it for this.
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// A cleaner approach would be appreciated - maybe just an official generic
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// flags region in the protection field.
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#define B_OVERCOMMITTING_AREA (1 << 12)
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#define B_SHARED_AREA (1 << 13)
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#define B_KERNEL_AREA (1 << 14)
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// Usable from userland according to its protection flags, but the area
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// itself is not deletable, resizable, etc from userland.
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#define B_USER_AREA_FLAGS \
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(B_USER_PROTECTION | B_OVERCOMMITTING_AREA | B_CLONEABLE_AREA)
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#define B_KERNEL_AREA_FLAGS \
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(B_KERNEL_PROTECTION | B_SHARED_AREA)
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// mapping argument for several internal VM functions
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enum {
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REGION_NO_PRIVATE_MAP = 0,
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REGION_PRIVATE_MAP
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};
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enum {
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// TODO: these are here only temporarily - it's a private
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// addition to the BeOS create_area() lock flags
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//! (Only for use during the boot process.) Indicates the specified address
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//! is already mapped, and the corresponding pages should be found and
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//! inserted into the new cache.
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B_ALREADY_WIRED = 7,
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};
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#define MEMORY_TYPE_SHIFT 28
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#endif /* _SYSTEM_VM_DEFS_H */
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