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/* SPDX-License-Identifier: GPL-2.0 */ /* * Written by Pat Gaughen (gone@us.ibm.com) Mar 2002 * */ #ifndef _ASM_X86_MMZONE_32_H #define _ASM_X86_MMZONE_32_H #include <asm/smp.h> #ifdef CONFIG_NUMA extern struct pglist_data *node_data[]; #define NODE_DATA(nid) (node_data[nid]) #endif /* CONFIG_NUMA */ #ifdef CONFIG_DISCONTIGMEM /* * generic node memory support, the following assumptions apply: * * 1) memory comes in 64Mb contiguous chunks which are either present or not * 2) we will not have more than 64Gb in total * * for now assume that 64Gb is max amount of RAM for whole system * 64Gb / 4096bytes/page = 16777216 pages */ #define MAX_NR_PAGES 16777216 #define MAX_SECTIONS 1024 #define PAGES_PER_SECTION (MAX_NR_PAGES/MAX_SECTIONS) extern s8 physnode_map[]; static inline int pfn_to_nid(unsigned long pfn) { #ifdef CONFIG_NUMA return((int) physnode_map[(pfn) / PAGES_PER_SECTION]); #else return 0; #endif } static inline int pfn_valid(int pfn) { int nid = pfn_to_nid(pfn); if (nid >= 0) return (pfn < node_end_pfn(nid)); return 0; } #define early_pfn_valid(pfn) pfn_valid((pfn)) #endif /* CONFIG_DISCONTIGMEM */ #endif /* _ASM_X86_MMZONE_32_H */
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