1/*
2 * Written by Pat Gaughen (gone@us.ibm.com) Mar 2002
3 *
4 */
5
6#ifndef _ASM_MMZONE_H_
7#define _ASM_MMZONE_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#ifdef CONFIG_X86_NUMAQ
16	#include <asm/numaq.h>
17#elif defined(CONFIG_ACPI_SRAT)  /* summit or generic arch */
18	#include <asm/srat.h>
19#endif
20
21extern int get_memcfg_numa_flat(void );
22/*
23 * This allows any one NUMA architecture to be compiled
24 * for, and still fall back to the flat function if it
25 * fails.
26 */
27static inline void get_memcfg_numa(void)
28{
29#ifdef CONFIG_X86_NUMAQ
30	if (get_memcfg_numaq())
31		return;
32#elif defined(CONFIG_ACPI_SRAT)
33	if (get_memcfg_from_srat())
34		return;
35#endif
36
37	get_memcfg_numa_flat();
38}
39
40extern int early_pfn_to_nid(unsigned long pfn);
41extern void numa_kva_reserve(void);
42
43#else /* !CONFIG_NUMA */
44
45#define get_memcfg_numa get_memcfg_numa_flat
46#define get_zholes_size(n) (0)
47
48static inline void numa_kva_reserve(void)
49{
50}
51#endif /* CONFIG_NUMA */
52
53#ifdef CONFIG_DISCONTIGMEM
54
55/*
56 * generic node memory support, the following assumptions apply:
57 *
58 * 1) memory comes in 256Mb contigious chunks which are either present or not
59 * 2) we will not have more than 64Gb in total
60 *
61 * for now assume that 64Gb is max amount of RAM for whole system
62 *    64Gb / 4096bytes/page = 16777216 pages
63 */
64#define MAX_NR_PAGES 16777216
65#define MAX_ELEMENTS 256
66#define PAGES_PER_ELEMENT (MAX_NR_PAGES/MAX_ELEMENTS)
67
68extern s8 physnode_map[];
69
70static inline int pfn_to_nid(unsigned long pfn)
71{
72#ifdef CONFIG_NUMA
73	return((int) physnode_map[(pfn) / PAGES_PER_ELEMENT]);
74#else
75	return 0;
76#endif
77}
78
79/*
80 * Following are macros that each numa implmentation must define.
81 */
82
83#define node_start_pfn(nid)	(NODE_DATA(nid)->node_start_pfn)
84#define node_end_pfn(nid)						\
85({									\
86	pg_data_t *__pgdat = NODE_DATA(nid);				\
87	__pgdat->node_start_pfn + __pgdat->node_spanned_pages;		\
88})
89
90#define kern_addr_valid(kaddr)	(0)
91
92#ifdef CONFIG_X86_NUMAQ                /* we have contiguous memory on NUMA-Q */
93#define pfn_valid(pfn)          ((pfn) < num_physpages)
94#else
95static inline int pfn_valid(int pfn)
96{
97	int nid = pfn_to_nid(pfn);
98
99	if (nid >= 0)
100		return (pfn < node_end_pfn(nid));
101	return 0;
102}
103#endif /* CONFIG_X86_NUMAQ */
104
105#endif /* CONFIG_DISCONTIGMEM */
106
107#ifdef CONFIG_NEED_MULTIPLE_NODES
108
109/*
110 * Following are macros that are specific to this numa platform.
111 */
112#define reserve_bootmem(addr, size) \
113	reserve_bootmem_node(NODE_DATA(0), (addr), (size))
114#define alloc_bootmem(x) \
115	__alloc_bootmem_node(NODE_DATA(0), (x), SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
116#define alloc_bootmem_low(x) \
117	__alloc_bootmem_node(NODE_DATA(0), (x), SMP_CACHE_BYTES, 0)
118#define alloc_bootmem_pages(x) \
119	__alloc_bootmem_node(NODE_DATA(0), (x), PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
120#define alloc_bootmem_low_pages(x) \
121	__alloc_bootmem_node(NODE_DATA(0), (x), PAGE_SIZE, 0)
122#define alloc_bootmem_node(pgdat, x)					\
123({									\
124	struct pglist_data  __maybe_unused			\
125				*__alloc_bootmem_node__pgdat = (pgdat);	\
126	__alloc_bootmem_node(NODE_DATA(0), (x), SMP_CACHE_BYTES,	\
127						__pa(MAX_DMA_ADDRESS));	\
128})
129#define alloc_bootmem_pages_node(pgdat, x)				\
130({									\
131	struct pglist_data  __maybe_unused			\
132				*__alloc_bootmem_node__pgdat = (pgdat);	\
133	__alloc_bootmem_node(NODE_DATA(0), (x), PAGE_SIZE,		\
134						__pa(MAX_DMA_ADDRESS))	\
135})
136#define alloc_bootmem_low_pages_node(pgdat, x)				\
137({									\
138	struct pglist_data  __maybe_unused			\
139				*__alloc_bootmem_node__pgdat = (pgdat);	\
140	__alloc_bootmem_node(NODE_DATA(0), (x), PAGE_SIZE, 0);		\
141})
142#endif /* CONFIG_NEED_MULTIPLE_NODES */
143
144#endif /* _ASM_MMZONE_H_ */
145