arch_kernel.h revision 3fbb2468
1/*
2** Copyright 2001-2002, Travis Geiselbrecht. All rights reserved.
3** Distributed under the terms of the NewOS License.
4*/
5#ifndef _KERNEL_ARCH_ARM_KERNEL_H
6#define _KERNEL_ARCH_ARM_KERNEL_H
7
8#include <arch/cpu.h>
9
10// memory layout
11#define KERNEL_BASE	0x80000000
12#define KERNEL_SIZE	0x800000
13#define KERNEL_TOP	(KERNEL_BASE + (KERNEL_SIZE - 1))
14
15/*
16** User space layout is a little special:
17** The user space does not completely cover the space not covered by the kernel.
18** This is accomplished by starting user space at 1Mb and running to 64kb short of kernel space.
19** The lower 1Mb reserved spot makes it easy to find null pointer references and guarantees a
20** region wont be placed there. The 64kb region assures a user space thread cannot pass
21** a buffer into the kernel as part of a syscall that would cross into kernel space.
22*/
23#define USER_BASE		0x100000
24#define USER_BASE_ANY		USER_BASE
25#define USER_SIZE		(0x80000000 - (0x10000 + 0x100000))
26#define USER_TOP		(USER_BASE + (USER_SIZE - 1))
27
28#define KERNEL_USER_DATA_BASE	0x60000000
29#define USER_STACK_REGION	0x70000000
30#define USER_STACK_REGION_SIZE	((USER_TOP - USER_STACK_REGION) + 1)
31
32#endif	/* _KERNEL_ARCH_ARM_KERNEL_H */
33