1 #ifndef __ASM_SH_SEGMENT_H 2 #define __ASM_SH_SEGMENT_H 3 4 #ifndef __ASSEMBLY__ 5 6 typedef 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