65 lines
2.1 KiB
C
65 lines
2.1 KiB
C
/*
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* Copyright 2002-2008, Axel Dörfler, axeld@pinc-software.de. 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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// additional protection flags
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// Note: the VM probably won't support all combinations - it will try
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// its best, but create_area() will fail if it has to.
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// Of course, the exact behaviour will be documented somewhere...
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#define B_EXECUTE_AREA 0x04
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#define B_STACK_AREA 0x08
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// "stack" protection is not available on most platforms - it's used
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// to only commit memory as needed, and have guard pages at the
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// bottom of the stack.
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// "execute" protection is currently ignored, but nevertheless, you
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// should use it if you require to execute code in that area.
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#define B_KERNEL_EXECUTE_AREA 0x40
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#define B_KERNEL_STACK_AREA 0x80
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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 a 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 0x1000
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#define B_SHARED_AREA 0x2000
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#define B_KERNEL_AREA 0x4000
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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 (B_USER_PROTECTION | B_OVERCOMMITTING_AREA)
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#define B_KERNEL_AREA_FLAGS \
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(B_KERNEL_PROTECTION | B_USER_CLONEABLE_AREA | 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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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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