| Greg Kroah-Hartman | b244131 | 2017-11-01 15:07:57 +0100 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| Russell King | 05944d7 | 2006-11-30 20:43:51 +0000 | [diff] [blame] | 2 | #ifndef ASMARM_SPARSEMEM_H |
| 3 | #define ASMARM_SPARSEMEM_H |
| 4 | |
| 5 | #include <asm/memory.h> |
| 6 | |
| Russell King | 07f841b | 2008-10-01 17:11:06 +0100 | [diff] [blame] | 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 | * |
| Kevin Cernekee | db57f88 | 2015-08-10 20:53:11 +0100 | [diff] [blame] | 19 | * These can be overridden in your mach/memory.h. |
| Russell King | 07f841b | 2008-10-01 17:11:06 +0100 | [diff] [blame] | 20 | */ |
| Kevin Cernekee | db57f88 | 2015-08-10 20:53:11 +0100 | [diff] [blame] | 21 | #if !defined(MAX_PHYSMEM_BITS) || !defined(SECTION_SIZE_BITS) |
| 22 | #define MAX_PHYSMEM_BITS 36 |
| 23 | #define SECTION_SIZE_BITS 28 |
| Russell King | 07f841b | 2008-10-01 17:11:06 +0100 | [diff] [blame] | 24 | #endif |
| Russell King | 05944d7 | 2006-11-30 20:43:51 +0000 | [diff] [blame] | 25 | |
| 26 | #endif |