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 // memory layout 10 #define KERNEL_BASE 0x80000000 11 #define KERNEL_SIZE 0x80000000 12 #define KERNEL_TOP (KERNEL_BASE + (KERNEL_SIZE - 1)) 13 14 /* 15 ** User space layout is a little special: 16 ** The user space does not completely cover the space not covered by the kernel. 17 ** This is accomplished by starting user space at 1Mb and running to 64kb short of kernel space. 18 ** The lower 1Mb reserved spot makes it easy to find null pointer references and guarantees a 19 ** region wont be placed there. The 64kb region assures a user space thread cannot pass 20 ** a buffer into the kernel as part of a syscall that would cross into kernel space. 21 */ 22 #define USER_BASE 0x100000 23 #define USER_BASE_ANY USER_BASE 24 #define USER_SIZE (0x80000000 - (0x10000 + 0x100000)) 25 #define USER_TOP (USER_BASE + USER_SIZE) 26 27 #define KERNEL_USER_DATA_BASE 0x6fff0000 28 #define USER_STACK_REGION 0x70000000 29 #define USER_STACK_REGION_SIZE (USER_TOP - USER_STACK_REGION) 30 31 #endif /* _KERNEL_ARCH_ARM_KERNEL_H */ 32