| Paul Mundt | b241cb0 | 2007-06-06 17:52:19 +0900 | [diff] [blame^] | 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 | } |