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  */
setup_bootmem_node(int nid,unsigned long start,unsigned long end)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