linux/include/asm-m68k/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
  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
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