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 20typedef struct { 21 unsigned long seg; 22} mm_segment_t; 23 24#define MAKE_MM_SEG(s) ((mm_segment_t) { (s) }) 25#define USER_DS MAKE_MM_SEG(__USER_DS) 26#define KERNEL_DS MAKE_MM_SEG(__KERNEL_DS) 27 28/* 29 * Get/set the SFC/DFC registers for MOVES instructions 30 */ 31 32static inline mm_segment_t get_fs(void) 33{ 34 mm_segment_t _v; 35 __asm__ ("movec %/dfc,%0":"=r" (_v.seg):); 36 37 return _v; 38} 39 40static inline mm_segment_t get_ds(void) 41{ 42 /* return the supervisor data space code */ 43 return KERNEL_DS; 44} 45 46static inline void set_fs(mm_segment_t val) 47{ 48 __asm__ __volatile__ ("movec %0,%/sfc\n\t" 49 "movec %0,%/dfc\n\t" 50 : /* no outputs */ : "r" (val.seg) : "memory"); 51} 52 53#define segment_eq(a,b) ((a).seg == (b).seg) 54 55#endif /* __ASSEMBLY__ */ 56 57#endif /* _M68K_SEGMENT_H */ 58