2 * arch/sh/mm/numa.c - Multiple node support for SH machines
4 * Copyright (C) 2007 Paul Mundt
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
10 #include <linux/module.h>
11 #include <linux/bootmem.h>
13 #include <linux/numa.h>
14 #include <linux/pfn.h>
15 #include <asm/sections.h>
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);
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.
27 void __init setup_memory(void)
29 unsigned long free_pfn = PFN_UP(__pa(_end));
32 * Node 0 sets up its pgdat at the first available pfn,
33 * and bumps it up before setting up the bootmem allocator.
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];
41 setup_bootmem_allocator(free_pfn);
43 /* Give the platforms a chance to hook up their nodes */
47 void __init setup_bootmem_node(int nid, unsigned long start, unsigned long end)
49 unsigned long bootmap_pages, bootmap_start, bootmap_size;
50 unsigned long start_pfn, free_pfn, end_pfn;
52 /* Don't allow bogus node assignment */
53 BUG_ON(nid > MAX_NUMNODES || nid == 0);
56 * The free pfn starts at the beginning of the range, and is
57 * advanced as necessary for pgdat and node map allocations.
59 free_pfn = start_pfn = start >> PAGE_SHIFT;
60 end_pfn = end >> PAGE_SHIFT;
62 __add_active_range(nid, start_pfn, end_pfn);
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));
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;
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,
79 free_bootmem_with_active_regions(nid, end_pfn);
81 /* Reserve the pgdat and bootmap space with the bootmem allocator */
82 reserve_bootmem_node(NODE_DATA(nid), start_pfn << PAGE_SHIFT,
83 sizeof(struct pglist_data), BOOTMEM_DEFAULT);
84 reserve_bootmem_node(NODE_DATA(nid), free_pfn << PAGE_SHIFT,
85 bootmap_pages << PAGE_SHIFT, BOOTMEM_DEFAULT);
91 sparse_memory_present_with_active_regions(nid);