/arch/sh/include/asm/segment.h

https://bitbucket.org/cresqo/cm7-p500-kernel · C Header · 34 lines · 19 code · 8 blank · 7 comment · 1 complexity · 754f98fb24ad45b4cf9e6f0a2d6894e0 MD5 · raw file 

    

  1. #ifndef __ASM_SH_SEGMENT_H
    2. 

  2. #define __ASM_SH_SEGMENT_H
    3. 

  3. 

  4. #ifndef __ASSEMBLY__
    5. 

  5. 

  6. typedef struct {
    7. 

  7. 	unsigned long seg;
    8. 

  8. } mm_segment_t;
    9. 

  9. 

  10. #define MAKE_MM_SEG(s)	((mm_segment_t) { (s) })
    11. 

  11. 

  12. /*
    13. 

  13.  * The fs value determines whether argument validity checking should be
    14. 

  14.  * performed or not.  If get_fs() == USER_DS, checking is performed, with
    15. 

  15.  * get_fs() == KERNEL_DS, checking is bypassed.
    16. 

  16.  *
    17. 

  17.  * For historical reasons, these macros are grossly misnamed.
    18. 

  18.  */
    19. 

  19. #define KERNEL_DS	MAKE_MM_SEG(0xFFFFFFFFUL)
    20. 

  20. #ifdef CONFIG_MMU
    21. 

  21. #define USER_DS		MAKE_MM_SEG(PAGE_OFFSET)
    22. 

  22. #else
    23. 

  23. #define USER_DS		KERNEL_DS
    24. 

  24. #endif
    25. 

  25. 

  26. #define segment_eq(a,b)	((a).seg == (b).seg)
    27. 

  27. 

  28. #define get_ds()	(KERNEL_DS)
    29. 

  29. 

  30. #define get_fs()	(current_thread_info()->addr_limit)
    31. 

  31. #define set_fs(x)	(current_thread_info()->addr_limit = (x))
    32. 

  32. 

  33. #endif /* __ASSEMBLY__ */
    34. 

  34. #endif /* __ASM_SH_SEGMENT_H */
    35.