include/asm/sparsemem.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 #ifndef ASMARM_SPARSEMEM_H
0003 #define ASMARM_SPARSEMEM_H
0004
0005 #include <asm/memory.h>
0006
0007 /*
0008  * Two definitions are required for sparsemem:
0009  *
0010  * MAX_PHYSMEM_BITS: The number of physical address bits required
0011  *   to address the last byte of memory.
0012  *
0013  * SECTION_SIZE_BITS: The number of physical address bits to cover
0014  *   the maximum amount of memory in a section.
0015  *
0016  * Eg, if you have 2 banks of up to 64MB at 0x80000000, 0x84000000,
0017  * then MAX_PHYSMEM_BITS is 32, SECTION_SIZE_BITS is 26.
0018  *
0019  * These can be overridden in your mach/memory.h.
0020  */
0021 #if !defined(MAX_PHYSMEM_BITS) || !defined(SECTION_SIZE_BITS)
0022 #define MAX_PHYSMEM_BITS    36
0023 #define SECTION_SIZE_BITS   28
0024 #endif
0025
0026 #endif