31 lines
1.1 KiB
C
31 lines
1.1 KiB
C
/*
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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_PPC_KERNEL_H
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#define _KERNEL_ARCH_PPC_KERNEL_H
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#include <arch/cpu.h>
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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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/*
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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 kernel.
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** This is accomplished by starting user space at 1Mb and running to 64kb short of kernel space.
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** The lower 1Mb reserved spot makes it easy to find null pointer references and guarantees a
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** region wont be placed there. The 64kb region assures a user space thread cannot pass
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** a buffer into the kernel as part of a syscall that would cross into kernel space.
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*/
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#define USER_BASE 0x100000
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#define USER_SIZE (0x80000000 - (0x10000 + 0x100000))
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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_BASE + (USER_SIZE - USER_STACK_REGION))
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#endif /* _KERNEL_ARCH_PPC_KERNEL_H */
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