| Greg Kroah-Hartman | b244131 | 2017-11-01 15:07:57 +0100 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| H. Peter Anvin | 1965aae | 2008-10-22 22:26:29 -0700 | [diff] [blame] | 2 | #ifndef _ASM_X86_SPARSEMEM_H |
| 3 | #define _ASM_X86_SPARSEMEM_H |
| Thomas Gleixner | 8a423ff | 2008-01-30 13:30:37 +0100 | [diff] [blame] | 4 | |
| 5 | #ifdef CONFIG_SPARSEMEM |
| 6 | /* |
| 7 | * generic non-linear memory support: |
| 8 | * |
| 9 | * 1) we will not split memory into more chunks than will fit into the flags |
| 10 | * field of the struct page |
| 11 | * |
| 12 | * SECTION_SIZE_BITS 2^n: size of each section |
| 13 | * MAX_PHYSADDR_BITS 2^n: max size of physical address space |
| 14 | * MAX_PHYSMEM_BITS 2^n: how much memory we can have in that space |
| 15 | * |
| 16 | */ |
| 17 | |
| Thomas Gleixner | 96a388d | 2007-10-11 11:20:03 +0200 | [diff] [blame] | 18 | #ifdef CONFIG_X86_32 |
| Thomas Gleixner | 8a423ff | 2008-01-30 13:30:37 +0100 | [diff] [blame] | 19 | # ifdef CONFIG_X86_PAE |
| Jeremy Fitzhardinge | fb8e837 | 2008-03-27 17:28:39 -0700 | [diff] [blame] | 20 | # define SECTION_SIZE_BITS 29 |
| Thomas Gleixner | 8a423ff | 2008-01-30 13:30:37 +0100 | [diff] [blame] | 21 | # define MAX_PHYSADDR_BITS 36 |
| 22 | # define MAX_PHYSMEM_BITS 36 |
| 23 | # else |
| 24 | # define SECTION_SIZE_BITS 26 |
| 25 | # define MAX_PHYSADDR_BITS 32 |
| 26 | # define MAX_PHYSMEM_BITS 32 |
| 27 | # endif |
| 28 | #else /* CONFIG_X86_32 */ |
| 29 | # define SECTION_SIZE_BITS 27 /* matt - 128 is convenient right now */ |
| Kirill A. Shutemov | 162434e | 2018-02-14 14:16:54 +0300 | [diff] [blame] | 30 | # define MAX_PHYSADDR_BITS (pgtable_l5_enabled ? 52 : 44) |
| 31 | # define MAX_PHYSMEM_BITS (pgtable_l5_enabled ? 52 : 46) |
| Thomas Gleixner | 8a423ff | 2008-01-30 13:30:37 +0100 | [diff] [blame] | 32 | #endif |
| 33 | |
| 34 | #endif /* CONFIG_SPARSEMEM */ |
| H. Peter Anvin | 1965aae | 2008-10-22 22:26:29 -0700 | [diff] [blame] | 35 | #endif /* _ASM_X86_SPARSEMEM_H */ |