1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef _ASM_X86_SPARSEMEM_H
 3#define _ASM_X86_SPARSEMEM_H
 4
 5#include <linux/types.h>
 6
 7#ifdef CONFIG_SPARSEMEM
 8/*
 9 * generic non-linear memory support:
10 *
11 * 1) we will not split memory into more chunks than will fit into the flags
12 *    field of the struct page
13 *
14 * SECTION_SIZE_BITS		2^n: size of each section
15 * MAX_PHYSMEM_BITS		2^n: max size of physical address space
 
16 *
17 */
18
19#ifdef CONFIG_X86_32
20# ifdef CONFIG_X86_PAE
21#  define SECTION_SIZE_BITS	29
 
22#  define MAX_PHYSMEM_BITS	36
23# else
24#  define SECTION_SIZE_BITS	26
 
25#  define MAX_PHYSMEM_BITS	32
26# endif
27#else /* CONFIG_X86_32 */
28# define SECTION_SIZE_BITS	27 /* matt - 128 is convenient right now */
29# define MAX_PHYSMEM_BITS	(pgtable_l5_enabled() ? 52 : 46)
 
30#endif
31
32#endif /* CONFIG_SPARSEMEM */
33
34#endif /* _ASM_X86_SPARSEMEM_H */

 1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef _ASM_X86_SPARSEMEM_H
 3#define _ASM_X86_SPARSEMEM_H
 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
18#ifdef CONFIG_X86_32
19# ifdef CONFIG_X86_PAE
20#  define SECTION_SIZE_BITS	29
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 */
30# define MAX_PHYSADDR_BITS	(pgtable_l5_enabled ? 52 : 44)
31# define MAX_PHYSMEM_BITS	(pgtable_l5_enabled ? 52 : 46)
32#endif
33
34#endif /* CONFIG_SPARSEMEM */
 
35#endif /* _ASM_X86_SPARSEMEM_H */