1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_SPARSEMEM_H
3 #define _ASM_X86_SPARSEMEM_H
5 #include <linux/types.h>
7 #ifdef CONFIG_SPARSEMEM
9 * generic non-linear memory support:
11 * 1) we will not split memory into more chunks than will fit into the flags
12 * field of the struct page
14 * SECTION_SIZE_BITS 2^n: size of each section
15 * MAX_PHYSMEM_BITS 2^n: max size of physical address space
20 # ifdef CONFIG_X86_PAE
21 # define SECTION_SIZE_BITS 29
22 # define MAX_PHYSMEM_BITS 36
24 # define SECTION_SIZE_BITS 26
25 # define MAX_PHYSMEM_BITS 32
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)
32 #endif /* CONFIG_SPARSEMEM */
35 #ifdef CONFIG_NUMA_KEEP_MEMINFO
36 extern int phys_to_target_node(phys_addr_t start);
37 #define phys_to_target_node phys_to_target_node
38 extern int memory_add_physaddr_to_nid(u64 start);
39 #define memory_add_physaddr_to_nid memory_add_physaddr_to_nid
41 #endif /* __ASSEMBLY__ */
43 #endif /* _ASM_X86_SPARSEMEM_H */