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Linux/arch/m68k/include/asm/segment.h

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  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 
 33 static 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 
 40 static 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 
 47 static 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 

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