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arch
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powerpc
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kernel
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idle_power4.S

idle_power4.S 980 B
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  1. /*
    2. 

  2.  *  This file contains the power_save function for 970-family CPUs.
    3. 

  3.  *
    4. 

  4.  *  This program is free software; you can redistribute it and/or
    5. 

  5.  *  modify it under the terms of the GNU General Public License
    6. 

  6.  *  as published by the Free Software Foundation; either version
    7. 

  7.  *  2 of the License, or (at your option) any later version.
    8. 

  8.  */
    9. 

  9. 

  10. #include <linux/config.h>
    11. 

  11. #include <linux/threads.h>
    12. 

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

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

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

  15. #include <asm/thread_info.h>
    16. 

  16. #include <asm/ppc_asm.h>
    17. 

  17. #include <asm/asm-offsets.h>
    18. 

  18. 

  19. #undef DEBUG
    20. 

  20. 

  21. 	.text
    22. 

  22. 

  23. _GLOBAL(power4_idle)
    24. 

  24. BEGIN_FTR_SECTION
    25. 

  25. 	blr
    26. 

  26. END_FTR_SECTION_IFCLR(CPU_FTR_CAN_NAP)
    27. 

  27. 	/* Now check if user or arch enabled NAP mode */
    28. 

  28. 	LOAD_REG_ADDRBASE(r3,powersave_nap)
    29. 

  29. 	lwz	r4,ADDROFF(powersave_nap)(r3)
    30. 

  30. 	cmpwi	0,r4,0
    31. 

  31. 	beqlr
    32. 

  32. 

  33. 	/* Go to NAP now */
    34. 

  34. BEGIN_FTR_SECTION
    35. 

  35. 	DSSALL
    36. 

  36. 	sync
    37. 

  37. END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
    38. 

  38. 	mfmsr	r7
    39. 

  39. 	ori	r7,r7,MSR_EE
    40. 

  40. 	oris	r7,r7,MSR_POW@h
    41. 

  41. 	sync
    42. 

  42. 	isync
    43. 

  43. 	mtmsrd	r7
    44. 

  44. 	isync
    45. 

  45. 	sync
    46. 

  46. 	blr
    47.