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/* summit or generic arch */ 17#include <asm/srat.h> 18 19extern int get_memcfg_numa_flat(void); 20/* 21 * This allows any one NUMA architecture to be compiled 22 * for, and still fall back to the flat function if it 23 * fails. 24 */ 25static inline void get_memcfg_numa(void) 26{ 27 28 if (get_memcfg_numaq()) 29 return; 30 if (get_memcfg_from_srat()) 31 return; 32 get_memcfg_numa_flat(); 33} 34 35extern void resume_map_numa_kva(pgd_t *pgd); 36 37#else /* !CONFIG_NUMA */ 38 39#define get_memcfg_numa get_memcfg_numa_flat 40 41static inline void resume_map_numa_kva(pgd_t *pgd) {} 42 43#endif /* CONFIG_NUMA */ 44 45#ifdef CONFIG_DISCONTIGMEM 46 47/* 48 * generic node memory support, the following assumptions apply: 49 * 50 * 1) memory comes in 64Mb contiguous chunks which are either present or not 51 * 2) we will not have more than 64Gb in total 52 * 53 * for now assume that 64Gb is max amount of RAM for whole system 54 * 64Gb / 4096bytes/page = 16777216 pages 55 */ 56#define MAX_NR_PAGES 16777216 57#define MAX_ELEMENTS 1024 58#define PAGES_PER_ELEMENT (MAX_NR_PAGES/MAX_ELEMENTS) 59 60extern s8 physnode_map[]; 61 62static inline int pfn_to_nid(unsigned long pfn) 63{ 64#ifdef CONFIG_NUMA 65 return((int) physnode_map[(pfn) / PAGES_PER_ELEMENT]); 66#else 67 return 0; 68#endif 69} 70 71/* 72 * Following are macros that each numa implmentation must define. 73 */ 74 75#define node_start_pfn(nid) (NODE_DATA(nid)->node_start_pfn) 76#define node_end_pfn(nid) \ 77({ \ 78 pg_data_t *__pgdat = NODE_DATA(nid); \ 79 __pgdat->node_start_pfn + __pgdat->node_spanned_pages; \ 80}) 81 82static inline int pfn_valid(int pfn) 83{ 84 int nid = pfn_to_nid(pfn); 85 86 if (nid >= 0) 87 return (pfn < node_end_pfn(nid)); 88 return 0; 89} 90 91#endif /* CONFIG_DISCONTIGMEM */ 92 93#ifdef CONFIG_NEED_MULTIPLE_NODES 94/* always use node 0 for bootmem on this numa platform */ 95#define bootmem_arch_preferred_node(__bdata, size, align, goal, limit) \ 96 (NODE_DATA(0)->bdata) 97#endif /* CONFIG_NEED_MULTIPLE_NODES */ 98 99#endif /* _ASM_X86_MMZONE_32_H */ 100