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csum_ipv6_magic.S

csum_ipv6_magic.S 2.2 KB
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  1. /*
    2. 

  2.  * arch/alpha/lib/csum_ipv6_magic.S
    3. 

  3.  * Contributed by Richard Henderson <rth@tamu.edu>
    4. 

  4.  *
    5. 

  5.  * unsigned short csum_ipv6_magic(struct in6_addr *saddr,
    6. 

  6.  *                                struct in6_addr *daddr,
    7. 

  7.  *                                __u32 len,
    8. 

  8.  *                                unsigned short proto,
    9. 

  9.  *                                unsigned int csum);
    10. 

  10.  */
    11. 

  11. 

  12. 	.globl csum_ipv6_magic
    13. 

  13. 	.align 4
    14. 

  14. 	.ent csum_ipv6_magic
    15. 

  15. 	.frame $30,0,$26,0
    16. 

  16. csum_ipv6_magic:
    17. 

  17. 	.prologue 0
    18. 

  18. 

  19. 	ldq	$0,0($16)	# e0    : load src & dst addr words
    20. 

  20. 	zapnot	$20,15,$20	# .. e1 : zero extend incoming csum
    21. 

  21. 	extqh	$18,1,$4	# e0    : byte swap len & proto while we wait
    22. 

  22. 	ldq	$1,8($16)	# .. e1 :
    23. 

  23. 

  24. 	extbl	$18,1,$5	# e0	:
    25. 

  25. 	ldq	$2,0($17)	# .. e1 :
    26. 

  26. 	extbl	$18,2,$6	# e0 	:
    27. 

  27. 	ldq	$3,8($17)	# .. e1 :
    28. 

  28. 

  29. 	extbl	$18,3,$18	# e0	:
    30. 

  30. 	sra	$4,32,$4	# e0	:
    31. 

  31. 	sll	$5,16,$5	# e0	:
    32. 

  32. 	addq	$20,$0,$20	# .. e1 : begin summing the words
    33. 

  33. 

  34. 	sll	$6,8,$6		# e0	:
    35. 

  35. 	cmpult	$20,$0,$0	# .. e1 :
    36. 

  36. 	extwh	$19,7,$7	# e0    :
    37. 

  37. 	or	$4,$18,$18	# .. e1 :
    38. 

  38. 

  39. 	extbl	$19,1,$19	# e0    :
    40. 

  40. 	or	$5,$6,$5	# .. e1 :
    41. 

  41. 	or	$18,$5,$18	# e0    : len complete
    42. 

  42. 	or	$19,$7,$19	# .. e1 :
    43. 

  43. 

  44. 	sll	$19,48,$19	# e0    :
    45. 

  45. 	addq	$20,$1,$20	# .. e1 :
    46. 

  46. 	sra	$19,32,$19	# e0    : proto complete
    47. 

  47. 	cmpult	$20,$1,$1	# .. e1 :
    48. 

  48. 

  49. 	nop			# e0    :
    50. 

  50. 	addq	$20,$2,$20	# .. e1 :
    51. 

  51. 	cmpult	$20,$2,$2	# e0    :
    52. 

  52. 	addq	$20,$3,$20	# .. e1 :
    53. 

  53. 

  54. 	cmpult	$20,$3,$3	# e0    :
    55. 

  55. 	addq	$20,$18,$20	# .. e1 :
    56. 

  56. 	cmpult	$20,$18,$18	# e0    :
    57. 

  57. 	addq	$20,$19,$20	# .. e1 :
    58. 

  58. 

  59. 	cmpult	$20,$19,$19	# e0    :
    60. 

  60. 	addq	$0,$1,$0	# .. e1 : merge the carries back into the csum
    61. 

  61. 	addq	$2,$3,$2	# e0    :
    62. 

  62. 	addq	$18,$19,$18	# .. e1 :
    63. 

  63. 

  64. 	addq	$0,$2,$0	# e0    :
    65. 

  65. 	addq	$20,$18,$20	# .. e1 :
    66. 

  66. 	addq	$0,$20,$0	# e0    :
    67. 

  67. 	unop			#       :
    68. 

  68. 

  69. 	extwl	$0,2,$2		# e0    : begin folding the 64-bit value
    70. 

  70. 	zapnot	$0,3,$3		# .. e1 :
    71. 

  71. 	extwl	$0,4,$1		# e0    :
    72. 

  72. 	addq	$2,$3,$3	# .. e1 :
    73. 

  73. 

  74. 	extwl	$0,6,$0		# e0    :
    75. 

  75. 	addq	$3,$1,$3	# .. e1 :
    76. 

  76. 	addq	$0,$3,$0	# e0    :
    77. 

  77. 	unop			#       :
    78. 

  78. 

  79. 	extwl	$0,2,$1		# e0    : fold 18-bit value
    80. 

  80. 	zapnot	$0,3,$0		# .. e1 :
    81. 

  81. 	addq	$0,$1,$0	# e0    :
    82. 

  82. 	unop			#       :
    83. 

  83. 

  84. 	extwl	$0,2,$1		# e0    : fold 17-bit value
    85. 

  85. 	zapnot	$0,3,$0		# .. e1 :
    86. 

  86. 	addq	$0,$1,$0	# e0    :
    87. 

  87. 	not	$0,$0		# e1    : and complement.
    88. 

  88. 

  89. 	zapnot	$0,3,$0		# e0    :
    90. 

  90. 	ret			# .. e1 :
    91. 

  91. 

  92. 	.end csum_ipv6_magic
    93.