release/src-rt-6.x.4708/linux/linux-2.6.36/arch/sh/include/asm/segment.h

   1 #ifndef __ASM_SH_SEGMENT_H
   2 #define __ASM_SH_SEGMENT_H
   3
   4 #ifndef __ASSEMBLY__
   5
   6 typedef struct {
   7         unsigned long seg;
   8 } mm_segment_t;
   9
  10 #define MAKE_MM_SEG(s)  ((mm_segment_t) { (s) })
  11
  12 /*
  13  * The fs value determines whether argument validity checking should be
  14  * performed or not.  If get_fs() == USER_DS, checking is performed, with
  15  * get_fs() == KERNEL_DS, checking is bypassed.
  16  *
  17  * For historical reasons, these macros are grossly misnamed.
  18  */
  19 #define KERNEL_DS       MAKE_MM_SEG(0xFFFFFFFFUL)
  20 #ifdef CONFIG_MMU
  21 #define USER_DS         MAKE_MM_SEG(PAGE_OFFSET)
  22 #else
  23 #define USER_DS         KERNEL_DS
  24 #endif
  25
  26 #define segment_eq(a,b) ((a).seg == (b).seg)
  27
  28 #define get_ds()        (KERNEL_DS)
  29
  30 #define get_fs()        (current_thread_info()->addr_limit)
  31 #define set_fs(x)       (current_thread_info()->addr_limit = (x))
  32
  33 #endif /* __ASSEMBLY__ */
  34 #endif /* __ASM_SH_SEGMENT_H */