root/arch/arm/include/asm/sparsemem.h

INCLUDED FROM

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef ASMARM_SPARSEMEM_H
   3 #define ASMARM_SPARSEMEM_H
   4 
   5 #include <asm/memory.h>
   6 
   7 /*
   8  * Two definitions are required for sparsemem:
   9  *
  10  * MAX_PHYSMEM_BITS: The number of physical address bits required
  11  *   to address the last byte of memory.
  12  *
  13  * SECTION_SIZE_BITS: The number of physical address bits to cover
  14  *   the maximum amount of memory in a section.
  15  *
  16  * Eg, if you have 2 banks of up to 64MB at 0x80000000, 0x84000000,
  17  * then MAX_PHYSMEM_BITS is 32, SECTION_SIZE_BITS is 26.
  18  *
  19  * These can be overridden in your mach/memory.h.
  20  */
  21 #if !defined(MAX_PHYSMEM_BITS) || !defined(SECTION_SIZE_BITS)
  22 #define MAX_PHYSMEM_BITS        36
  23 #define SECTION_SIZE_BITS       28
  24 #endif
  25 
  26 #endif