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locks.S

locks.S 2.1 KB
Cronologia Originale

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  1. /* SPDX-License-Identifier: GPL-2.0 */
    2. 

  2. /*
    3. 

  3.  * locks.S: SMP low-level lock primitives on Sparc.
    4. 

  4.  *
    5. 

  5.  * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
    6. 

  6.  * Copyright (C) 1998 Anton Blanchard (anton@progsoc.uts.edu.au)
    7. 

  7.  * Copyright (C) 1998 Jakub Jelinek   (jj@ultra.linux.cz)
    8. 

  8.  */
    9. 

  9. 

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

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

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

  13. #include <asm/spinlock.h>
    14. 

  14. #include <asm/export.h>
    15. 

  15. 

  16. 	.text
    17. 

  17. 	.align	4
    18. 

  18. 

  19. 	/* Read/writer locks, as usual this is overly clever to make it
    20. 

  20. 	 * as fast as possible.
    21. 

  21. 	 */
    22. 

  22. 

  23. 	/* caches... */
    24. 

  24. ___rw_read_enter_spin_on_wlock:
    25. 

  25. 	orcc	%g2, 0x0, %g0
    26. 

  26. 	be,a	___rw_read_enter
    27. 

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

  28. 	b	___rw_read_enter_spin_on_wlock
    29. 

  29. 	 ldub	[%g1 + 3], %g2
    30. 

  30. ___rw_read_try_spin_on_wlock:
    31. 

  31. 	andcc	%g2, 0xff, %g0
    32. 

  32. 	be,a	___rw_read_try
    33. 

  33. 	 ldstub	[%g1 + 3], %g2
    34. 

  34. 	xnorcc	%g2, 0x0, %o0	/* if g2 is ~0, set o0 to 0 and bugger off */
    35. 

  35. 	bne,a	___rw_read_enter_spin_on_wlock
    36. 

  36. 	 ld	[%g1], %g2
    37. 

  37. 	retl
    38. 

  38. 	 mov	%g4, %o7
    39. 

  39. ___rw_read_exit_spin_on_wlock:
    40. 

  40. 	orcc	%g2, 0x0, %g0
    41. 

  41. 	be,a	___rw_read_exit
    42. 

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

  43. 	b	___rw_read_exit_spin_on_wlock
    44. 

  44. 	 ldub	[%g1 + 3], %g2
    45. 

  45. ___rw_write_enter_spin_on_wlock:
    46. 

  46. 	orcc	%g2, 0x0, %g0
    47. 

  47. 	be,a	___rw_write_enter
    48. 

  48. 	 ldstub	[%g1 + 3], %g2
    49. 

  49. 	b	___rw_write_enter_spin_on_wlock
    50. 

  50. 	 ld	[%g1], %g2
    51. 

  51. 

  52. 	.globl	___rw_read_enter
    53. 

  53. EXPORT_SYMBOL(___rw_read_enter)
    54. 

  54. ___rw_read_enter:
    55. 

  55. 	orcc	%g2, 0x0, %g0
    56. 

  56. 	bne,a	___rw_read_enter_spin_on_wlock
    57. 

  57. 	 ldub	[%g1 + 3], %g2
    58. 

  58. 	ld	[%g1], %g2
    59. 

  59. 	add	%g2, 1, %g2
    60. 

  60. 	st	%g2, [%g1]
    61. 

  61. 	retl
    62. 

  62. 	 mov	%g4, %o7
    63. 

  63. 

  64. 	.globl	___rw_read_exit
    65. 

  65. EXPORT_SYMBOL(___rw_read_exit)
    66. 

  66. ___rw_read_exit:
    67. 

  67. 	orcc	%g2, 0x0, %g0
    68. 

  68. 	bne,a	___rw_read_exit_spin_on_wlock
    69. 

  69. 	 ldub	[%g1 + 3], %g2
    70. 

  70. 	ld	[%g1], %g2
    71. 

  71. 	sub	%g2, 0x1ff, %g2
    72. 

  72. 	st	%g2, [%g1]
    73. 

  73. 	retl
    74. 

  74. 	 mov	%g4, %o7
    75. 

  75. 

  76. 	.globl	___rw_read_try
    77. 

  77. EXPORT_SYMBOL(___rw_read_try)
    78. 

  78. ___rw_read_try:
    79. 

  79. 	orcc	%g2, 0x0, %g0
    80. 

  80. 	bne	___rw_read_try_spin_on_wlock
    81. 

  81. 	 ld	[%g1], %g2
    82. 

  82. 	add	%g2, 1, %g2
    83. 

  83. 	st	%g2, [%g1]
    84. 

  84. 	set	1, %o1
    85. 

  85. 	retl
    86. 

  86. 	 mov	%g4, %o7
    87. 

  87. 

  88. 	.globl	___rw_write_enter
    89. 

  89. EXPORT_SYMBOL(___rw_write_enter)
    90. 

  90. ___rw_write_enter:
    91. 

  91. 	orcc	%g2, 0x0, %g0
    92. 

  92. 	bne	___rw_write_enter_spin_on_wlock
    93. 

  93. 	 ld	[%g1], %g2
    94. 

  94. 	andncc	%g2, 0xff, %g0
    95. 

  95. 	bne,a	___rw_write_enter_spin_on_wlock
    96. 

  96. 	 stb	%g0, [%g1 + 3]
    97. 

  97. 	retl
    98. 

  98. 	 mov	%g4, %o7
    99. 

  99.