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/bootmem.h> 12 #include <linux/mm.h> 13 #include <linux/numa.h> 14 #include <linux/pfn.h> 15 #include <asm/sections.h> 16 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); 20 21 /* 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. 26 */ 27 void __init setup_memory(void) 28 { 29 unsigned long free_pfn = PFN_UP(__pa(_end)); 30 31 /* 32 * Node 0 sets up its pgdat at the first available pfn, 33 * and bumps it up before setting up the bootmem allocator. 34 */ 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]; 39 40 /* Set up node 0 */ 41 setup_bootmem_allocator(free_pfn); 42 43 /* Give the platforms a chance to hook up their nodes */ 44 plat_mem_setup(); 45 } 46 47 void __init setup_bootmem_node(int nid, unsigned long start, unsigned long end) 48 { 49 unsigned long bootmap_pages, bootmap_start, bootmap_size; 50 unsigned long start_pfn, free_pfn, end_pfn; 51 52 /* Don't allow bogus node assignment */ 53 BUG_ON(nid > MAX_NUMNODES || nid == 0); 54 55 /* 56 * The free pfn starts at the beginning of the range, and is 57 * advanced as necessary for pgdat and node map allocations. 58 */ 59 free_pfn = start_pfn = start >> PAGE_SHIFT; 60 end_pfn = end >> PAGE_SHIFT; 61 62 add_active_range(nid, start_pfn, end_pfn); 63 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)); 68 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; 72 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, 77 end_pfn); 78 79 free_bootmem_with_active_regions(nid, end_pfn); 80 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)); 84 reserve_bootmem_node(NODE_DATA(nid), free_pfn << PAGE_SHIFT, 85 bootmap_pages << PAGE_SHIFT); 86 87 /* It's up */ 88 node_set_online(nid); 89 90 /* Kick sparsemem */ 91 sparse_memory_present_with_active_regions(nid); 92 } 93