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copy.S

copy.S 1.3 KB
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  1. /* ----------------------------------------------------------------------- *
    2. 

  2.  *
    3. 

  3.  *   Copyright (C) 1991, 1992 Linus Torvalds
    4. 

  4.  *   Copyright 2007 rPath, Inc. - All Rights Reserved
    5. 

  5.  *
    6. 

  6.  *   This file is part of the Linux kernel, and is made available under
    7. 

  7.  *   the terms of the GNU General Public License version 2.
    8. 

  8.  *
    9. 

  9.  * ----------------------------------------------------------------------- */
    10. 

  10. 

  11. #include <linux/linkage.h>
    12. 

  12. 

  13. /*
    14. 

  14.  * Memory copy routines
    15. 

  15.  */
    16. 

  16. 

  17. 	.code16
    18. 

  18. 	.text
    19. 

  19. 

  20. GLOBAL(memcpy)
    21. 

  21. 	pushw	%si
    22. 

  22. 	pushw	%di
    23. 

  23. 	movw	%ax, %di
    24. 

  24. 	movw	%dx, %si
    25. 

  25. 	pushw	%cx
    26. 

  26. 	shrw	$2, %cx
    27. 

  27. 	rep; movsl
    28. 

  28. 	popw	%cx
    29. 

  29. 	andw	$3, %cx
    30. 

  30. 	rep; movsb
    31. 

  31. 	popw	%di
    32. 

  32. 	popw	%si
    33. 

  33. 	retl
    34. 

  34. ENDPROC(memcpy)
    35. 

  35. 

  36. GLOBAL(memset)
    37. 

  37. 	pushw	%di
    38. 

  38. 	movw	%ax, %di
    39. 

  39. 	movzbl	%dl, %eax
    40. 

  40. 	imull	$0x01010101,%eax
    41. 

  41. 	pushw	%cx
    42. 

  42. 	shrw	$2, %cx
    43. 

  43. 	rep; stosl
    44. 

  44. 	popw	%cx
    45. 

  45. 	andw	$3, %cx
    46. 

  46. 	rep; stosb
    47. 

  47. 	popw	%di
    48. 

  48. 	retl
    49. 

  49. ENDPROC(memset)
    50. 

  50. 

  51. GLOBAL(copy_from_fs)
    52. 

  52. 	pushw	%ds
    53. 

  53. 	pushw	%fs
    54. 

  54. 	popw	%ds
    55. 

  55. 	calll	memcpy
    56. 

  56. 	popw	%ds
    57. 

  57. 	retl
    58. 

  58. ENDPROC(copy_from_fs)
    59. 

  59. 

  60. GLOBAL(copy_to_fs)
    61. 

  61. 	pushw	%es
    62. 

  62. 	pushw	%fs
    63. 

  63. 	popw	%es
    64. 

  64. 	calll	memcpy
    65. 

  65. 	popw	%es
    66. 

  66. 	retl
    67. 

  67. ENDPROC(copy_to_fs)
    68. 

  68. 

  69. #if 0 /* Not currently used, but can be enabled as needed */
    70. 

  70. GLOBAL(copy_from_gs)
    71. 

  71. 	pushw	%ds
    72. 

  72. 	pushw	%gs
    73. 

  73. 	popw	%ds
    74. 

  74. 	calll	memcpy
    75. 

  75. 	popw	%ds
    76. 

  76. 	retl
    77. 

  77. ENDPROC(copy_from_gs)
    78. 

  78. 

  79. GLOBAL(copy_to_gs)
    80. 

  80. 	pushw	%es
    81. 

  81. 	pushw	%gs
    82. 

  82. 	popw	%es
    83. 

  83. 	calll	memcpy
    84. 

  84. 	popw	%es
    85. 

  85. 	retl
    86. 

  86. ENDPROC(copy_to_gs)
    87. 

  87. #endif
    88.