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linux-libre
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arch
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m68k
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coldfire
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cache.c

cache.c 1.3 KB
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  1. /***************************************************************************/
    2. 

  2. 

  3. /*
    4. 

  4.  *	cache.c -- general ColdFire Cache maintenance code
    5. 

  5.  *
    6. 

  6.  *	Copyright (C) 2010, Greg Ungerer (gerg@snapgear.com)
    7. 

  7.  */
    8. 

  8. 

  9. /***************************************************************************/
    10. 

  10. 

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

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

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

  14. 

  15. /***************************************************************************/
    16. 

  16. #ifdef CACHE_PUSH
    17. 

  17. /***************************************************************************/
    18. 

  18. 

  19. /*
    20. 

  20.  *	Use cpushl to push all dirty cache lines back to memory.
    21. 

  21.  *	Older versions of GAS don't seem to know how to generate the
    22. 

  22.  *	ColdFire cpushl instruction... Oh well, bit stuff it for now.
    23. 

  23.  */
    24. 

  24. 

  25. void mcf_cache_push(void)
    26. 

  26. {
    27. 

  27. 	__asm__ __volatile__ (
    28. 

  28. 		"clrl	%%d0\n\t"
    29. 

  29. 		"1:\n\t"
    30. 

  30. 		"movel	%%d0,%%a0\n\t"
    31. 

  31. 		"2:\n\t"
    32. 

  32. 		".word	0xf468\n\t"
    33. 

  33. 		"addl	%0,%%a0\n\t"
    34. 

  34. 		"cmpl	%1,%%a0\n\t"
    35. 

  35. 		"blt	2b\n\t"
    36. 

  36. 		"addql	#1,%%d0\n\t"
    37. 

  37. 		"cmpil	%2,%%d0\n\t"
    38. 

  38. 		"bne	1b\n\t"
    39. 

  39. 		: /* No output */
    40. 

  40. 		: "i" (CACHE_LINE_SIZE),
    41. 

  41. 		  "i" (DCACHE_SIZE / CACHE_WAYS),
    42. 

  42. 		  "i" (CACHE_WAYS)
    43. 

  43. 		: "d0", "a0" );
    44. 

  44. }
    45. 

  45. 

  46. /***************************************************************************/
    47. 

  47. #endif /* CACHE_PUSH */
    48. 

  48. /***************************************************************************/
    49. 

  49.