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dcr-low.S

dcr-low.S 858 B
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  1. /*
    2. 

  2.  * "Indirect" DCR access
    3. 

  3.  *
    4. 

  4.  * Copyright (c) 2004 Eugene Surovegin <ebs@ebshome.net>
    5. 

  5.  *
    6. 

  6.  * This program is free software; you can redistribute it and/or modify it
    7. 

  7.  * under  the terms of  the GNU General Public License as published by the
    8. 

  8.  * Free Software Foundation;  either version 2 of the License, or (at your
    9. 

  9.  * option) any later version.
    10. 

  10.  */
    11. 

  11. 

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

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

  14. 

  15. #define DCR_ACCESS_PROLOG(table) \
    16. 

  16. 	rlwinm  r3,r3,4,18,27;   \
    17. 

  17. 	lis     r5,table@h;      \
    18. 

  18. 	ori     r5,r5,table@l;   \
    19. 

  19. 	add     r3,r3,r5;        \
    20. 

  20. 	mtctr   r3;              \
    21. 

  21. 	bctr
    22. 

  22. 

  23. _GLOBAL(__mfdcr)
    24. 

  24. 	DCR_ACCESS_PROLOG(__mfdcr_table)
    25. 

  25. 

  26. _GLOBAL(__mtdcr)
    27. 

  27. 	DCR_ACCESS_PROLOG(__mtdcr_table)
    28. 

  28. 

  29. __mfdcr_table:
    30. 

  30. 	mfdcr  r3,0; blr
    31. 

  31. __mtdcr_table:
    32. 

  32. 	mtdcr  0,r4; blr
    33. 

  33. 

  34. dcr     = 1
    35. 

  35.         .rept   1023
    36. 

  36. 	mfdcr   r3,dcr; blr
    37. 

  37. 	mtdcr   dcr,r4; blr
    38. 

  38. 	dcr     = dcr + 1
    39. 

  39. 	.endr
    40.