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 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_memory(void) 27 { 28 unsigned long free_pfn = PFN_UP(__pa(_end)); 29 30 /* 31 * Node 0 sets up its pgdat at the first available pfn, 32 * and bumps it up before setting up the bootmem allocator. 33 */ 34 NODE_DATA(0) = pfn_to_kaddr(free_pfn); 35 memset(NODE_DATA(0), 0, sizeof(struct pglist_data)); 36 free_pfn += PFN_UP(sizeof(struct pglist_data)); 37 NODE_DATA(0)->bdata = &bootmem_node_data[0]; 38 39 /* Set up node 0 */ 40 setup_bootmem_allocator(free_pfn); 41 42 /* Give the platforms a chance to hook up their nodes */ 43 plat_mem_setup(); 44 } 45 46 void __init setup_bootmem_node(int nid, unsigned long start, unsigned long end) 47 { 48 unsigned long bootmap_pages, bootmap_start, bootmap_size; 49 unsigned long start_pfn, free_pfn, end_pfn; 50 51 /* Don't allow bogus node assignment */ 52 BUG_ON(nid > MAX_NUMNODES || nid == 0); 53 54 /* 55 * The free pfn starts at the beginning of the range, and is 56 * advanced as necessary for pgdat and node map allocations. 57 */ 58 free_pfn = start_pfn = start >> PAGE_SHIFT; 59 end_pfn = end >> PAGE_SHIFT; 60 61 __add_active_range(nid, start_pfn, end_pfn); 62 63 /* Node-local pgdat */ 64 NODE_DATA(nid) = pfn_to_kaddr(free_pfn); 65 free_pfn += PFN_UP(sizeof(struct pglist_data)); 66 memset(NODE_DATA(nid), 0, sizeof(struct pglist_data)); 67 68 NODE_DATA(nid)->bdata = &bootmem_node_data[nid]; 69 NODE_DATA(nid)->node_start_pfn = start_pfn; 70 NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn; 71 72 /* Node-local bootmap */ 73 bootmap_pages = bootmem_bootmap_pages(end_pfn - start_pfn); 74 bootmap_start = (unsigned long)pfn_to_kaddr(free_pfn); 75 bootmap_size = init_bootmem_node(NODE_DATA(nid), free_pfn, start_pfn, 76 end_pfn); 77 78 free_bootmem_with_active_regions(nid, end_pfn); 79 80 /* Reserve the pgdat and bootmap space with the bootmem allocator */ 81 reserve_bootmem_node(NODE_DATA(nid), start_pfn << PAGE_SHIFT, 82 sizeof(struct pglist_data), BOOTMEM_DEFAULT); 83 reserve_bootmem_node(NODE_DATA(nid), free_pfn << PAGE_SHIFT, 84 bootmap_pages << PAGE_SHIFT, BOOTMEM_DEFAULT); 85 86 /* It's up */ 87 node_set_online(nid); 88 89 /* Kick sparsemem */ 90 sparse_memory_present_with_active_regions(nid); 91 } 92