1/* 2** Copyright 2001-2002, Travis Geiselbrecht. All rights reserved. 3** Distributed under the terms of the NewOS License. 4*/ 5#ifndef _KERNEL_ARCH_PPC_KERNEL_H 6#define _KERNEL_ARCH_PPC_KERNEL_H 7 8#include <arch/cpu.h> 9 10// memory layout 11#define KERNEL_BASE 0x80000000 12#define KERNEL_SIZE 0x80000000 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 0x6fff0000 29#define USER_STACK_REGION 0x70000000 30#define USER_STACK_REGION_SIZE ((USER_TOP - USER_STACK_REGION) + 1) 31 32#endif /* _KERNEL_ARCH_PPC_KERNEL_H */ 33