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