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/memblock.h>
12 #include <linux/mm.h>
13 #include <linux/numa.h>
14 #include <linux/pfn.h>
15 #include <asm/sections.h>
16
17 struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
18 EXPORT_SYMBOL_GPL(node_data);
19
20 /*
21 * On SH machines the conventional approach is to stash system RAM
22 * in node 0, and other memory blocks in to node 1 and up, ordered by
23 * latency. Each node's pgdat is node-local at the beginning of the node,
24 * immediately followed by the node mem map.
25 */
26 void __init setup_bootmem_node(int nid, unsigned long start, unsigned long end)
27 {
28 unsigned long start_pfn, end_pfn;
29
30 /* Don't allow bogus node assignment */
31 BUG_ON(nid >= MAX_NUMNODES || nid <= 0);
32
33 start_pfn = PFN_DOWN(start);
34 end_pfn = PFN_DOWN(end);
35
36 pmb_bolt_mapping((unsigned long)__va(start), start, end - start,
37 PAGE_KERNEL);
38
39 memblock_add(start, end - start);
40
41 __add_active_range(nid, start_pfn, end_pfn);
42
43 /* Node-local pgdat */
44 NODE_DATA(nid) = memblock_alloc_node(sizeof(struct pglist_data),
45 SMP_CACHE_BYTES, nid);
46 if (!NODE_DATA(nid))
47 panic("%s: Failed to allocate %zu bytes align=0x%x nid=%d\n",
48 __func__, sizeof(struct pglist_data), SMP_CACHE_BYTES,
49 nid);
50
51 NODE_DATA(nid)->node_start_pfn = start_pfn;
52 NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
53
54 /* It's up */
55 node_set_online(nid);
56 }
57
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.