8a0c9d52c6
It now lives in OS.h. The idea is that this will now be accessible to userland applications, so userland memory is protected from access by other processes, just as kernel memory is. No functional change (the constants are still the same, though I've changed some to use shifts to make clear which bits are allocated are which are unused.)
56 lines
1.6 KiB
C
56 lines
1.6 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_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 (1 << 12)
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#define B_SHARED_AREA (1 << 13)
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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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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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