arch/arm/include/asm/sparsemem.h

   1 #ifndef ASMARM_SPARSEMEM_H
   2 #define ASMARM_SPARSEMEM_H
   3
   4 #include <asm/memory.h>
   5
   6 /*
   7  * Two definitions are required for sparsemem:
   8  *
   9  * MAX_PHYSMEM_BITS: The number of physical address bits required
  10  *   to address the last byte of memory.
  11  *
  12  * SECTION_SIZE_BITS: The number of physical address bits to cover
  13  *   the maximum amount of memory in a section.
  14  *
  15  * Eg, if you have 2 banks of up to 64MB at 0x80000000, 0x84000000,
  16  * then MAX_PHYSMEM_BITS is 32, SECTION_SIZE_BITS is 26.
  17  *
  18  * Define these in your mach/memory.h.
  19  */
  20 #if !defined(SECTION_SIZE_BITS) || !defined(MAX_PHYSMEM_BITS)
  21 #error Sparsemem is not supported on this platform
  22 #endif
  23
  24 #endif