1 #ifndef _M68K_SEGMENT_H 2 #define _M68K_SEGMENT_H 3 4 /* define constants */ 5 /* Address spaces (FC0-FC2) */ 6 #define USER_DATA (1) 7 #ifndef __USER_DS 8 #define __USER_DS (USER_DATA) 9 #endif 10 #define USER_PROGRAM (2) 11 #define SUPER_DATA (5) 12 #ifndef __KERNEL_DS 13 #define __KERNEL_DS (SUPER_DATA) 14 #endif 15 #define SUPER_PROGRAM (6) 16 #define CPU_SPACE (7) 17 18 #ifndef __ASSEMBLY__ 19 20 typedef struct { 21 unsigned long seg; 22 } mm_segment_t; 23 24 #define MAKE_MM_SEG(s) ((mm_segment_t) { (s) }) 25 26 #ifdef CONFIG_CPU_HAS_ADDRESS_SPACES 27 /* 28 * Get/set the SFC/DFC registers for MOVES instructions 29 */ 30 #define USER_DS MAKE_MM_SEG(__USER_DS) 31 #define KERNEL_DS MAKE_MM_SEG(__KERNEL_DS) 32 get_fs(void)33static inline mm_segment_t get_fs(void) 34 { 35 mm_segment_t _v; 36 __asm__ ("movec %/dfc,%0":"=r" (_v.seg):); 37 return _v; 38 } 39 set_fs(mm_segment_t val)40static inline void set_fs(mm_segment_t val) 41 { 42 __asm__ __volatile__ ("movec %0,%/sfc\n\t" 43 "movec %0,%/dfc\n\t" 44 : /* no outputs */ : "r" (val.seg) : "memory"); 45 } 46 get_ds(void)47static inline mm_segment_t get_ds(void) 48 { 49 /* return the supervisor data space code */ 50 return KERNEL_DS; 51 } 52 53 #else 54 #define USER_DS MAKE_MM_SEG(TASK_SIZE) 55 #define KERNEL_DS MAKE_MM_SEG(0xFFFFFFFF) 56 #define get_ds() (KERNEL_DS) 57 #define get_fs() (current_thread_info()->addr_limit) 58 #define set_fs(x) (current_thread_info()->addr_limit = (x)) 59 #endif 60 61 #define segment_eq(a, b) ((a).seg == (b).seg) 62 63 #endif /* __ASSEMBLY__ */ 64 65 #endif /* _M68K_SEGMENT_H */ 66