7cbf8fdd5a
* Allow userland teams to create areas below 1 MB when requested specifically. * Note, this is a temporary solution - see the comments in the code. git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@25358 a95241bf-73f2-0310-859d-f6bbb57e9c96
39 lines
1.4 KiB
C
39 lines
1.4 KiB
C
/*
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* Copyright 2004-2008, Haiku Inc. All rights reserved.
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* Distributes 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 _KERNEL_ARCH_x86_KERNEL_H
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#define _KERNEL_ARCH_x86_KERNEL_H
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#ifndef _ASSEMBLER
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# include <arch/cpu.h>
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#endif
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// memory layout
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#define KERNEL_BASE 0x80000000
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#define KERNEL_SIZE 0x80000000
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#define KERNEL_TOP (KERNEL_BASE + (KERNEL_SIZE - 1))
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/* User space layout is a little special:
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* The user space does not completely cover the space not covered by the
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* kernel. There is a gap of 64kb between the user and kernel space. The 64kb
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* region assures a user space thread cannot pass a buffer into the kernel as
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* part of a syscall that would cross into kernel space.
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* Furthermore no areas are placed in the lower 1Mb unless the application
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* explicitly requests it to find null pointer references.
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* TODO: introduce the 1Mb lower barrier again - it's only used for vm86 mode,
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* and this should be moved into the kernel (and address space) completely.
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*/
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#define USER_BASE 0x00
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#define USER_BASE_ANY 0x100000
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#define USER_SIZE (KERNEL_BASE - 0x10000)
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#define USER_TOP (USER_BASE + USER_SIZE)
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#define USER_STACK_REGION 0x70000000
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#define USER_STACK_REGION_SIZE (USER_TOP - USER_STACK_REGION)
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#endif /* _KERNEL_ARCH_x86_KERNEL_H */
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