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dma2.S

dma2.S 981 B
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  1. /**************************************
    2. 

  2.  *
    3. 

  3.  * copyright @ Motorola, 1999
    4. 

  4.  *
    5. 

  5.  **************************************/
    6. 

  6. 

  7. /**********************************************************
    8. 

  8.  * function: load_runtime_reg
    9. 

  9.  *
    10. 

  10.  * input:  r3 - value of eumbbar
    11. 

  11.  *         r4 - register offset in embedded utility space
    12. 

  12.  *
    13. 

  13.  * output: r3 - register content
    14. 

  14.  **********************************************************/
    15. 

  15.       .text
    16. 

  16.       .align 2
    17. 

  17.       .global load_runtime_reg
    18. 

  18. 

  19. load_runtime_reg:
    20. 

  20. 

  21. 	      lwbrx	r3,r4,r3
    22. 

  22. 	      sync
    23. 

  23. 

  24.  	      bclr 20, 0
    25. 

  25. 

  26. /****************************************************************
    27. 

  27.  * function: store_runtime_reg
    28. 

  28.  *
    29. 

  29.  * input: r3 - value of eumbbar
    30. 

  30.  *        r4 - register offset in embedded utility space
    31. 

  31.  *        r5 - new value to be stored
    32. 

  32.  *
    33. 

  33.  ****************************************************************/
    34. 

  34.            .text
    35. 

  35.            .align 2
    36. 

  36.            .global store_runtime_reg
    37. 

  37. store_runtime_reg:
    38. 

  38. 

  39. 	      stwbrx r5,  r4, r3
    40. 

  40. 	      sync
    41. 

  41. 

  42. 		  bclr   20,0
    43. 

  43. 

  44. 

  45.