LXR linux/arch/m68k/include/asm/segment.h

   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
  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
  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
  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
  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