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atomic.S

atomic.S 1.2 KB
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  1. /* SPDX-License-Identifier: GPL-2.0 */
    2. 

  2. // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
    3. 

  3. 

  4. #include <linux/linkage.h>
    5. 

  5. #include <abi/entry.h>
    6. 

  6. 

  7. .text
    8. 

  8. 

  9. /*
    10. 

  10.  * int csky_cmpxchg(int oldval, int newval, int *ptr)
    11. 

  11.  *
    12. 

  12.  * If *ptr != oldval && return 1,
    13. 

  13.  * else *ptr = newval return 0.
    14. 

  14.  */
    15. 

  15. #ifdef CONFIG_CPU_HAS_LDSTEX
    16. 

  16. ENTRY(csky_cmpxchg)
    17. 

  17. 	USPTOKSP
    18. 

  18. 	mfcr	a3, epc
    19. 

  19. 	INCTRAP	a3
    20. 

  20. 

  21. 	subi    sp, 8
    22. 

  22. 	stw     a3, (sp, 0)
    23. 

  23. 	mfcr    a3, epsr
    24. 

  24. 	stw     a3, (sp, 4)
    25. 

  25. 

  26. 	psrset	ee
    27. 

  27. 1:
    28. 

  28. 	ldex	a3, (a2)
    29. 

  29. 	cmpne	a0, a3
    30. 

  30. 	bt16	2f
    31. 

  31. 	mov	a3, a1
    32. 

  32. 	stex	a3, (a2)
    33. 

  33. 	bez	a3, 1b
    34. 

  34. 2:
    35. 

  35. 	sync.is
    36. 

  36. 	mvc	a0
    37. 

  37. 	ldw	a3, (sp, 0)
    38. 

  38. 	mtcr	a3, epc
    39. 

  39. 	ldw     a3, (sp, 4)
    40. 

  40. 	mtcr	a3, epsr
    41. 

  41. 	addi	sp, 8
    42. 

  42. 	KSPTOUSP
    43. 

  43. 	rte
    44. 

  44. END(csky_cmpxchg)
    45. 

  45. #else
    46. 

  46. ENTRY(csky_cmpxchg)
    47. 

  47. 	USPTOKSP
    48. 

  48. 	mfcr	a3, epc
    49. 

  49. 	INCTRAP	a3
    50. 

  50. 

  51. 	subi    sp, 8
    52. 

  52. 	stw     a3, (sp, 0)
    53. 

  53. 	mfcr    a3, epsr
    54. 

  54. 	stw     a3, (sp, 4)
    55. 

  55. 

  56. 	psrset	ee
    57. 

  57. 1:
    58. 

  58. 	ldw	a3, (a2)
    59. 

  59. 	cmpne	a0, a3
    60. 

  60. 	bt16	3f
    61. 

  61. 2:
    62. 

  62. 	stw	a1, (a2)
    63. 

  63. 3:
    64. 

  64. 	mvc	a0
    65. 

  65. 	ldw	a3, (sp, 0)
    66. 

  66. 	mtcr	a3, epc
    67. 

  67. 	ldw     a3, (sp, 4)
    68. 

  68. 	mtcr	a3, epsr
    69. 

  69. 	addi	sp, 8
    70. 

  70. 	KSPTOUSP
    71. 

  71. 	rte
    72. 

  72. END(csky_cmpxchg)
    73. 

  73. 

  74. /*
    75. 

  75.  * Called from tlbmodified exception
    76. 

  76.  */
    77. 

  77. ENTRY(csky_cmpxchg_fixup)
    78. 

  78. 	mfcr	a0, epc
    79. 

  79. 	lrw	a1, 2b
    80. 

  80. 	cmpne	a1, a0
    81. 

  81. 	bt	1f
    82. 

  82. 	subi	a1, (2b - 1b)
    83. 

  83. 	stw	a1, (sp, LSAVE_PC)
    84. 

  84. 1:
    85. 

  85. 	rts
    86. 

  86. END(csky_cmpxchg_fixup)
    87. 

  87. #endif
    88.