1. 根目录:
2. arch
3. arm
4. include
5. asm
6. segment.h

#ifndef __ASM_ARM_SEGMENT_H
#define __ASM_ARM_SEGMENT_H

#define __KERNEL_CS   0x0
#define __KERNEL_DS   0x0

#define __USER_CS     0x1
#define __USER_DS     0x1

#endif /* __ASM_ARM_SEGMENT_H */