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sparc
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locks.S

locks.S 1.9 KB
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  1. /*
    2. 

  2.  * locks.S: SMP low-level lock primitives on Sparc.
    3. 

  3.  *
    4. 

  4.  * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
    5. 

  5.  * Copyright (C) 1998 Anton Blanchard (anton@progsoc.uts.edu.au)
    6. 

  6.  * Copyright (C) 1998 Jakub Jelinek   (jj@ultra.linux.cz)
    7. 

  7.  */
    8. 

  8. 

  9. #include <asm/ptrace.h>
    10. 

  10. #include <asm/psr.h>
    11. 

  11. #include <asm/smp.h>
    12. 

  12. #include <asm/spinlock.h>
    13. 

  13. 

  14. 	.text
    15. 

  15. 	.align	4
    16. 

  16. 

  17. 	/* Read/writer locks, as usual this is overly clever to make it
    18. 

  18. 	 * as fast as possible.
    19. 

  19. 	 */
    20. 

  20. 

  21. 	/* caches... */
    22. 

  22. ___rw_read_enter_spin_on_wlock:
    23. 

  23. 	orcc	%g2, 0x0, %g0
    24. 

  24. 	be,a	___rw_read_enter
    25. 

  25. 	 ldstub	[%g1 + 3], %g2
    26. 

  26. 	b	___rw_read_enter_spin_on_wlock
    27. 

  27. 	 ldub	[%g1 + 3], %g2
    28. 

  28. ___rw_read_try_spin_on_wlock:
    29. 

  29. 	andcc	%g2, 0xff, %g0
    30. 

  30. 	be,a	___rw_read_try
    31. 

  31. 	 ldstub	[%g1 + 3], %g2
    32. 

  32. 	xnorcc	%g2, 0x0, %o0	/* if g2 is ~0, set o0 to 0 and bugger off */
    33. 

  33. 	bne,a	___rw_read_enter_spin_on_wlock
    34. 

  34. 	 ld	[%g1], %g2
    35. 

  35. 	retl
    36. 

  36. 	 mov	%g4, %o7
    37. 

  37. ___rw_read_exit_spin_on_wlock:
    38. 

  38. 	orcc	%g2, 0x0, %g0
    39. 

  39. 	be,a	___rw_read_exit
    40. 

  40. 	 ldstub	[%g1 + 3], %g2
    41. 

  41. 	b	___rw_read_exit_spin_on_wlock
    42. 

  42. 	 ldub	[%g1 + 3], %g2
    43. 

  43. ___rw_write_enter_spin_on_wlock:
    44. 

  44. 	orcc	%g2, 0x0, %g0
    45. 

  45. 	be,a	___rw_write_enter
    46. 

  46. 	 ldstub	[%g1 + 3], %g2
    47. 

  47. 	b	___rw_write_enter_spin_on_wlock
    48. 

  48. 	 ld	[%g1], %g2
    49. 

  49. 

  50. 	.globl	___rw_read_enter
    51. 

  51. ___rw_read_enter:
    52. 

  52. 	orcc	%g2, 0x0, %g0
    53. 

  53. 	bne,a	___rw_read_enter_spin_on_wlock
    54. 

  54. 	 ldub	[%g1 + 3], %g2
    55. 

  55. 	ld	[%g1], %g2
    56. 

  56. 	add	%g2, 1, %g2
    57. 

  57. 	st	%g2, [%g1]
    58. 

  58. 	retl
    59. 

  59. 	 mov	%g4, %o7
    60. 

  60. 

  61. 	.globl	___rw_read_exit
    62. 

  62. ___rw_read_exit:
    63. 

  63. 	orcc	%g2, 0x0, %g0
    64. 

  64. 	bne,a	___rw_read_exit_spin_on_wlock
    65. 

  65. 	 ldub	[%g1 + 3], %g2
    66. 

  66. 	ld	[%g1], %g2
    67. 

  67. 	sub	%g2, 0x1ff, %g2
    68. 

  68. 	st	%g2, [%g1]
    69. 

  69. 	retl
    70. 

  70. 	 mov	%g4, %o7
    71. 

  71. 

  72. 	.globl	___rw_read_try
    73. 

  73. ___rw_read_try:
    74. 

  74. 	orcc	%g2, 0x0, %g0
    75. 

  75. 	bne	___rw_read_try_spin_on_wlock
    76. 

  76. 	 ld	[%g1], %g2
    77. 

  77. 	add	%g2, 1, %g2
    78. 

  78. 	st	%g2, [%g1]
    79. 

  79. 	set	1, %o1
    80. 

  80. 	retl
    81. 

  81. 	 mov	%g4, %o7
    82. 

  82. 

  83. 	.globl	___rw_write_enter
    84. 

  84. ___rw_write_enter:
    85. 

  85. 	orcc	%g2, 0x0, %g0
    86. 

  86. 	bne	___rw_write_enter_spin_on_wlock
    87. 

  87. 	 ld	[%g1], %g2
    88. 

  88. 	andncc	%g2, 0xff, %g0
    89. 

  89. 	bne,a	___rw_write_enter_spin_on_wlock
    90. 

  90. 	 stb	%g0, [%g1 + 3]
    91. 

  91. 	retl
    92. 

  92. 	 mov	%g4, %o7
    93.