root/include/cachebit.h

INCLUDED FROM

   1 #ifndef CACHEBIT_H
   2 #define CACHEBIT_H
   4 /*
   5 Macros used to manipulate the uncached bit on addresses
   6 may be used in core or module code
   7 
   8 An uncached view of camera ram is available at a high address range
   9 typically 0x10000000 or 0x40000000.
  10 Sometimes it is desriable to convert from one to the other
  11 NOTE the user is responsible for cleaning and/or flushing the caches
  12 to ensure the data is coherent, if required.
  13 These macro's only manipulate the bit on the address
  14 */
  16 // get CAM_UNCACHED_BIT from camera_info, if camera.h define is not available (module code)
  17 #ifndef CAM_UNCACHED_BIT
  18 #define CAM_UNCACHED_BIT (camera_info.cam_uncached_bit)
  19 #endif
  21 // typeof is a gcc extension, used to ensure returned pointer is the same type
  22 #define ADR_TO_UNCACHED(adr) ((typeof(adr))((unsigned)(adr)|CAM_UNCACHED_BIT))
  23 #define ADR_TO_CACHED(adr) ((typeof(adr))((unsigned)(adr)&(~CAM_UNCACHED_BIT)))
  24 #define ADR_IS_CACHED(adr) (!((unsigned)(adr)&(CAM_UNCACHED_BIT)))
  26 #endif