1#ifndef __ASM_SH_SEGMENT_H 2#define __ASM_SH_SEGMENT_H 3 4#ifndef __ASSEMBLY__ 5 6typedef struct { 7 unsigned long seg; 8} mm_segment_t; 9 10#define MAKE_MM_SEG(s) ((mm_segment_t) { (s) }) 11 12/* 13 * The fs value determines whether argument validity checking should be 14 * performed or not. If get_fs() == USER_DS, checking is performed, with 15 * get_fs() == KERNEL_DS, checking is bypassed. 16 * 17 * For historical reasons, these macros are grossly misnamed. 18 */ 19#define KERNEL_DS MAKE_MM_SEG(0xFFFFFFFFUL) 20#ifdef CONFIG_MMU 21#define USER_DS MAKE_MM_SEG(PAGE_OFFSET) 22#else 23#define USER_DS KERNEL_DS 24#endif 25 26#define segment_eq(a,b) ((a).seg == (b).seg) 27 28#define get_ds() (KERNEL_DS) 29 30#define get_fs() (current_thread_info()->addr_limit) 31#define set_fs(x) (current_thread_info()->addr_limit = (x)) 32 33#endif /* __ASSEMBLY__ */ 34#endif /* __ASM_SH_SEGMENT_H */ 35