1/* 2 * Written by Pat Gaughen (gone@us.ibm.com) Mar 2002 3 * 4 */ 5 6#ifndef _ASM_X86_MMZONE_32_H 7#define _ASM_X86_MMZONE_32_H 8 9#include <asm/smp.h> 10 11#ifdef CONFIG_NUMA 12extern struct pglist_data *node_data[]; 13#define NODE_DATA(nid) (node_data[nid]) 14 15#include <asm/numaq.h> 16 17extern void resume_map_numa_kva(pgd_t *pgd); 18 19#else /* !CONFIG_NUMA */ 20 21static inline void resume_map_numa_kva(pgd_t *pgd) {} 22 23#endif /* CONFIG_NUMA */ 24 25#ifdef CONFIG_DISCONTIGMEM 26 27/* 28 * generic node memory support, the following assumptions apply: 29 * 30 * 1) memory comes in 64Mb contiguous chunks which are either present or not 31 * 2) we will not have more than 64Gb in total 32 * 33 * for now assume that 64Gb is max amount of RAM for whole system 34 * 64Gb / 4096bytes/page = 16777216 pages 35 */ 36#define MAX_NR_PAGES 16777216 37#define MAX_SECTIONS 1024 38#define PAGES_PER_SECTION (MAX_NR_PAGES/MAX_SECTIONS) 39 40extern s8 physnode_map[]; 41 42static inline int pfn_to_nid(unsigned long pfn) 43{ 44#ifdef CONFIG_NUMA 45 return((int) physnode_map[(pfn) / PAGES_PER_SECTION]); 46#else 47 return 0; 48#endif 49} 50 51static inline int pfn_valid(int pfn) 52{ 53 int nid = pfn_to_nid(pfn); 54 55 if (nid >= 0) 56 return (pfn < node_end_pfn(nid)); 57 return 0; 58} 59 60#define early_pfn_valid(pfn) pfn_valid((pfn)) 61 62#endif /* CONFIG_DISCONTIGMEM */ 63 64#ifdef CONFIG_NEED_MULTIPLE_NODES 65/* always use node 0 for bootmem on this numa platform */ 66#define bootmem_arch_preferred_node(__bdata, size, align, goal, limit) \ 67 (NODE_DATA(0)->bdata) 68#endif /* CONFIG_NEED_MULTIPLE_NODES */ 69 70#endif /* _ASM_X86_MMZONE_32_H */ 71