xref: /openbmc/linux/arch/arm/include/asm/sparsemem.h (revision a9ff6961)
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef ASMARM_SPARSEMEM_H
3 #define ASMARM_SPARSEMEM_H
4 
5 #include <asm/page.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
27