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b241cb0c PM |
1 | /* |
2 | * arch/sh/mm/numa.c - Multiple node support for SH machines | |
3 | * | |
4 | * Copyright (C) 2007 Paul Mundt | |
5 | * | |
6 | * This file is subject to the terms and conditions of the GNU General Public | |
7 | * License. See the file "COPYING" in the main directory of this archive | |
8 | * for more details. | |
9 | */ | |
10 | #include <linux/module.h> | |
11 | #include <linux/bootmem.h> | |
12 | #include <linux/mm.h> | |
13 | #include <linux/numa.h> | |
14 | #include <linux/pfn.h> | |
15 | #include <asm/sections.h> | |
16 | ||
17 | static bootmem_data_t plat_node_bdata[MAX_NUMNODES]; | |
18 | struct pglist_data *node_data[MAX_NUMNODES] __read_mostly; | |
19 | EXPORT_SYMBOL_GPL(node_data); | |
20 | ||
21 | /* | |
22 | * On SH machines the conventional approach is to stash system RAM | |
23 | * in node 0, and other memory blocks in to node 1 and up, ordered by | |
24 | * latency. Each node's pgdat is node-local at the beginning of the node, | |
25 | * immediately followed by the node mem map. | |
26 | */ | |
27 | void __init setup_memory(void) | |
28 | { | |
29 | unsigned long free_pfn = PFN_UP(__pa(_end)); | |
30 | ||
31 | /* | |
32 | * Node 0 sets up its pgdat at the first available pfn, | |
33 | * and bumps it up before setting up the bootmem allocator. | |
34 | */ | |
35 | NODE_DATA(0) = pfn_to_kaddr(free_pfn); | |
36 | memset(NODE_DATA(0), 0, sizeof(struct pglist_data)); | |
37 | free_pfn += PFN_UP(sizeof(struct pglist_data)); | |
38 | NODE_DATA(0)->bdata = &plat_node_bdata[0]; | |
39 | ||
40 | /* Set up node 0 */ | |
41 | setup_bootmem_allocator(free_pfn); | |
42 | ||
43 | /* Give the platforms a chance to hook up their nodes */ | |
44 | plat_mem_setup(); | |
45 | } | |
46 | ||
47 | void __init setup_bootmem_node(int nid, unsigned long start, unsigned long end) | |
48 | { | |
49 | unsigned long bootmap_pages, bootmap_start, bootmap_size; | |
50 | unsigned long start_pfn, free_pfn, end_pfn; | |
51 | ||
52 | /* Don't allow bogus node assignment */ | |
53 | BUG_ON(nid > MAX_NUMNODES || nid == 0); | |
54 | ||
55 | /* | |
56 | * The free pfn starts at the beginning of the range, and is | |
57 | * advanced as necessary for pgdat and node map allocations. | |
58 | */ | |
59 | free_pfn = start_pfn = start >> PAGE_SHIFT; | |
60 | end_pfn = end >> PAGE_SHIFT; | |
61 | ||
62 | add_active_range(nid, start_pfn, end_pfn); | |
63 | ||
64 | /* Node-local pgdat */ | |
65 | NODE_DATA(nid) = pfn_to_kaddr(free_pfn); | |
66 | free_pfn += PFN_UP(sizeof(struct pglist_data)); | |
67 | memset(NODE_DATA(nid), 0, sizeof(struct pglist_data)); | |
68 | ||
69 | NODE_DATA(nid)->bdata = &plat_node_bdata[nid]; | |
70 | NODE_DATA(nid)->node_start_pfn = start_pfn; | |
71 | NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn; | |
72 | ||
73 | /* Node-local bootmap */ | |
74 | bootmap_pages = bootmem_bootmap_pages(end_pfn - start_pfn); | |
75 | bootmap_start = (unsigned long)pfn_to_kaddr(free_pfn); | |
76 | bootmap_size = init_bootmem_node(NODE_DATA(nid), free_pfn, start_pfn, | |
77 | end_pfn); | |
78 | ||
79 | free_bootmem_with_active_regions(nid, end_pfn); | |
80 | ||
81 | /* Reserve the pgdat and bootmap space with the bootmem allocator */ | |
82 | reserve_bootmem_node(NODE_DATA(nid), start_pfn << PAGE_SHIFT, | |
72a7fe39 | 83 | sizeof(struct pglist_data), BOOTMEM_DEFAULT); |
b241cb0c | 84 | reserve_bootmem_node(NODE_DATA(nid), free_pfn << PAGE_SHIFT, |
72a7fe39 | 85 | bootmap_pages << PAGE_SHIFT, BOOTMEM_DEFAULT); |
b241cb0c PM |
86 | |
87 | /* It's up */ | |
88 | node_set_online(nid); | |
89 | ||
90 | /* Kick sparsemem */ | |
91 | sparse_memory_present_with_active_regions(nid); | |
92 | } |