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esp-idf
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components
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esp_hw_support
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test
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test_ahb_arb_asm.S

test_ahb_arb_asm.S 935 B
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  1. #include "sdkconfig.h"
    2. 

  2. 

  3. #if CONFIG_IDF_TARGET_ESP32
    4. 

  4. 

  5. /*
    6. 

  6. This little bit of code is executed in-place by one CPU, but copied to a different memory region
    7. 

  7. by the other CPU. Make sure it stays position-independent.
    8. 

  8. */
    9. 

  9.     .text
    10. 

  10.     .align  4
    11. 

  11.     .global test_s32c1i_lock
    12. 

  12.     .type   test_s32c1i_lock,@function
    13. 

  13. //Args:
    14. 

  14. //a2 - lock addr
    15. 

  15. //a3 - val to lock with
    16. 

  16. //a4 - val to unlock with
    17. 

  17. //a5 - addr to increase
    18. 

  18. test_s32c1i_lock:
    19. 

  19. 	entry a1, 64
    20. 

  20. 	wsr a4, SCOMPARE1
    21. 

  21. lockloop:
    22. 

  22. 	mov a6, a3
    23. 

  23. 	s32c1i a6, a2, 0
    24. 

  24. 	bne a4, a6, lockloop
    25. 

  25. 

  26. 	l32i a6, a5, 0
    27. 

  27. 	//Give other CPU the time to mess up the inc if the lock somehow malfunctions
    28. 

  28. 	nop
    29. 

  29. 	nop
    30. 

  30. 	nop
    31. 

  31. 	nop
    32. 

  32. 	nop
    33. 

  33. 	nop
    34. 

  34. 	nop
    35. 

  35. 	nop
    36. 

  36. 	nop
    37. 

  37. 	nop
    38. 

  38. 	nop
    39. 

  39. 	nop
    40. 

  40. 	nop
    41. 

  41. 	nop
    42. 

  42. 	nop
    43. 

  43. 	nop
    44. 

  44. 	addi a6, a6, 1
    45. 

  45. 	s32i a6, a5, 0
    46. 

  46. 

  47. 

  48. //No need to actually let this loop but hey, a hang indicates an error, right?
    49. 

  49. 	wsr a3, SCOMPARE1
    50. 

  50. unlockloop:
    51. 

  51. 	mov a6, a4
    52. 

  52. 	s32c1i a6, a2, 0
    53. 

  53. 	bne a3, a6, unlockloop
    54. 

  54. 

  55. 	retw
    56. 

  56. 

  57. #endif // CONFIG_IDF_TARGET_ESP32
    58.