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NG4copy_to_user.S

NG4copy_to_user.S 943 B
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  1. /* NG4copy_to_user.S: Niagara-4 optimized copy to userspace.
    2. 

  2.  *
    3. 

  3.  * Copyright (C) 2012 David S. Miller (davem@davemloft.net)
    4. 

  4.  */
    5. 

  5. 

  6. #define EX_ST(x,y)		\
    7. 

  7. 98:	x;			\
    8. 

  8. 	.section __ex_table,"a";\
    9. 

  9. 	.align 4;		\
    10. 

  10. 	.word 98b, y;		\
    11. 

  11. 	.text;			\
    12. 

  12. 	.align 4;
    13. 

  13. 

  14. #define EX_ST_FP(x,y)		\
    15. 

  15. 98:	x;			\
    16. 

  16. 	.section __ex_table,"a";\
    17. 

  17. 	.align 4;		\
    18. 

  18. 	.word 98b, y##_fp;	\
    19. 

  19. 	.text;			\
    20. 

  20. 	.align 4;
    21. 

  21. 

  22. #ifndef ASI_AIUS
    23. 

  23. #define ASI_AIUS	0x11
    24. 

  24. #endif
    25. 

  25. 

  26. #ifndef ASI_BLK_INIT_QUAD_LDD_AIUS
    27. 

  27. #define ASI_BLK_INIT_QUAD_LDD_AIUS 0x23
    28. 

  28. #endif
    29. 

  29. 

  30. #define FUNC_NAME		NG4copy_to_user
    31. 

  31. #define STORE(type,src,addr)	type##a src, [addr] %asi
    32. 

  32. #define STORE_ASI		ASI_BLK_INIT_QUAD_LDD_AIUS
    33. 

  33. #define EX_RETVAL(x)		0
    34. 

  34. 

  35. #ifdef __KERNEL__
    36. 

  36. 	/* Writing to %asi is _expensive_ so we hardcode it.
    37. 

  37. 	 * Reading %asi to check for KERNEL_DS is comparatively
    38. 

  38. 	 * cheap.
    39. 

  39. 	 */
    40. 

  40. #define PREAMBLE					\
    41. 

  41. 	rd		%asi, %g1;			\
    42. 

  42. 	cmp		%g1, ASI_AIUS;			\
    43. 

  43. 	bne,pn		%icc, ___copy_in_user;		\
    44. 

  44. 	 nop
    45. 

  45. #endif
    46. 

  46. 

  47. #include "NG4memcpy.S"
    48. 

  48.