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gerrit-public.fairphone.software / kernel / msm-5.4 / b24413180f5600bcb3bb70fbed5cf186b60864bd / . / arch / x86 / include / asm / sparsemem.h
blob: 4fc1e9d3c43e78477d3144364eeedb4e6cb93d33 [file] [log] [blame]
Greg Kroah-Hartmanb2441312017-11-01 15:07:57 +0100[diff] [blame^]1/* SPDX-License-Identifier: GPL-2.0 */
H. Peter Anvin1965aae2008-10-22 22:26:29 -0700[diff] [blame]2#ifndef _ASM_X86_SPARSEMEM_H
3#define _ASM_X86_SPARSEMEM_H
Thomas Gleixner8a423ff2008-01-30 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 Gleixner96a388d2007-10-11 11:20:03 +0200[diff] [blame]18#ifdef CONFIG_X86_32
Thomas Gleixner8a423ff2008-01-30 13:30:37 +0100[diff] [blame]19# ifdef CONFIG_X86_PAE
Jeremy Fitzhardingefb8e8372008-03-27 17:28:39 -0700[diff] [blame]20# define SECTION_SIZE_BITS 29
Thomas Gleixner8a423ff2008-01-30 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. Shutemov4c7c4482017-03-30 11:07:27 +0300[diff] [blame]30# ifdef CONFIG_X86_5LEVEL
31# define MAX_PHYSADDR_BITS 52
32# define MAX_PHYSMEM_BITS 52
33# else
34# define MAX_PHYSADDR_BITS 44
35# define MAX_PHYSMEM_BITS 46
36# endif
Thomas Gleixner8a423ff2008-01-30 13:30:37 +0100[diff] [blame]37#endif
38
39#endif /* CONFIG_SPARSEMEM */
H. Peter Anvin1965aae2008-10-22 22:26:29 -0700[diff] [blame]40#endif /* _ASM_X86_SPARSEMEM_H */