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/arch/s390/include/asm/io.h

https://bitbucket.org/thekraven/iscream_thunderc-2.6.35
C++ Header | 54 lines | 24 code | 10 blank | 20 comment | 0 complexity | 97ccc3d211dd98a74bb672b98ce612d5 MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0 
    

  1. /*
    2. 

  2.  *  include/asm-s390/io.h
    3. 

  3.  *
    4. 

  4.  *  S390 version
    5. 

  5.  *    Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
    6. 

  6.  *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
    7. 

  7.  *
    8. 

  8.  *  Derived from "include/asm-i386/io.h"
    9. 

  9.  */
    10. 

  10. 

  11. #ifndef _S390_IO_H
    12. 

  12. #define _S390_IO_H
    13. 

  13. 

  14. #ifdef __KERNEL__
    15. 

  15. 

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

  17. 

  18. #define IO_SPACE_LIMIT 0xffffffff
    19. 

  19. 

  20. /*
    21. 

  21.  * Change virtual addresses to physical addresses and vv.
    22. 

  22.  * These are pretty trivial
    23. 

  23.  */
    24. 

  24. static inline unsigned long virt_to_phys(volatile void * address)
    25. 

  25. {
    26. 

  26. 	unsigned long real_address;
    27. 

  27. 	asm volatile(
    28. 

  28. 		 "	lra	%0,0(%1)\n"
    29. 

  29. 		 "	jz	0f\n"
    30. 

  30. 		 "	la	%0,0\n"
    31. 

  31.                  "0:"
    32. 

  32. 		 : "=a" (real_address) : "a" (address) : "cc");
    33. 

  33.         return real_address;
    34. 

  34. }
    35. 

  35. 

  36. static inline void * phys_to_virt(unsigned long address)
    37. 

  37. {
    38. 

  38. 	return (void *) address;
    39. 

  39. }
    40. 

  40. 

  41. /*
    42. 

  42.  * Convert a physical pointer to a virtual kernel pointer for /dev/mem
    43. 

  43.  * access
    44. 

  44.  */
    45. 

  45. #define xlate_dev_mem_ptr(p)	__va(p)
    46. 

  46. 

  47. /*
    48. 

  48.  * Convert a virtual cached pointer to an uncached pointer
    49. 

  49.  */
    50. 

  50. #define xlate_dev_kmem_ptr(p)	p
    51. 

  51. 

  52. #endif /* __KERNEL__ */
    53. 

  53. 

  54. #endif
    55. 

  55.