numa.c

 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/*
18 * On SH machines the conventional approach is to stash system RAM
19 * in node 0, and other memory blocks in to node 1 and up, ordered by
20 * latency. Each node's pgdat is node-local at the beginning of the node,
21 * immediately followed by the node mem map.
22 */
23void __init setup_bootmem_node(int nid, unsigned long start, unsigned long end)
24{
25	unsigned long start_pfn, end_pfn;
26
27	/* Don't allow bogus node assignment */
28	BUG_ON(nid >= MAX_NUMNODES || nid <= 0);
29
30	start_pfn = PFN_DOWN(start);
31	end_pfn = PFN_DOWN(end);
32
33	pmb_bolt_mapping((unsigned long)__va(start), start, end - start,
34			 PAGE_KERNEL);
35
36	memblock_add(start, end - start);
37
38	__add_active_range(nid, start_pfn, end_pfn);
39
40	/* Node-local pgdat */
41	NODE_DATA(nid) = memblock_alloc_node(sizeof(struct pglist_data),
42					     SMP_CACHE_BYTES, nid);
43	if (!NODE_DATA(nid))
44		panic("%s: Failed to allocate %zu bytes align=0x%x nid=%d\n",
45		      __func__, sizeof(struct pglist_data), SMP_CACHE_BYTES,
46		      nid);
47
48	NODE_DATA(nid)->node_start_pfn = start_pfn;
49	NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
50
51	/* It's up */
52	node_set_online(nid);
53}