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/lmb.h> 13 #include <linux/mm.h> 14 #include <linux/numa.h> 15 #include <linux/pfn.h> 16 #include <asm/sections.h> 17 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 u64 base = min_low_pfn << PAGE_SHIFT; 31 u64 size = (max_low_pfn << PAGE_SHIFT) - min_low_pfn; 32 33 lmb_add(base, size); 34 35 /* Reserve the LMB regions used by the kernel, initrd, etc.. */ 36 lmb_reserve(__MEMORY_START + CONFIG_ZERO_PAGE_OFFSET, 37 (PFN_PHYS(free_pfn) + PAGE_SIZE - 1) - 38 (__MEMORY_START + CONFIG_ZERO_PAGE_OFFSET)); 39 40 /* 41 * Node 0 sets up its pgdat at the first available pfn, 42 * and bumps it up before setting up the bootmem allocator. 43 */ 44 NODE_DATA(0) = pfn_to_kaddr(free_pfn); 45 memset(NODE_DATA(0), 0, sizeof(struct pglist_data)); 46 free_pfn += PFN_UP(sizeof(struct pglist_data)); 47 NODE_DATA(0)->bdata = &bootmem_node_data[0]; 48 49 /* Set up node 0 */ 50 setup_bootmem_allocator(free_pfn); 51 52 /* Give the platforms a chance to hook up their nodes */ 53 plat_mem_setup(); 54 } 55 56 void __init setup_bootmem_node(int nid, unsigned long start, unsigned long end) 57 { 58 unsigned long bootmap_pages; 59 unsigned long start_pfn, end_pfn; 60 unsigned long bootmem_paddr; 61 62 /* Don't allow bogus node assignment */ 63 BUG_ON(nid > MAX_NUMNODES || nid == 0); 64 65 start_pfn = start >> PAGE_SHIFT; 66 end_pfn = end >> PAGE_SHIFT; 67 68 lmb_add(start, end - start); 69 70 __add_active_range(nid, start_pfn, end_pfn); 71 72 /* Node-local pgdat */ 73 NODE_DATA(nid) = __va(lmb_alloc_base(sizeof(struct pglist_data), 74 SMP_CACHE_BYTES, end_pfn)); 75 memset(NODE_DATA(nid), 0, sizeof(struct pglist_data)); 76 77 NODE_DATA(nid)->bdata = &bootmem_node_data[nid]; 78 NODE_DATA(nid)->node_start_pfn = start_pfn; 79 NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn; 80 81 /* Node-local bootmap */ 82 bootmap_pages = bootmem_bootmap_pages(end_pfn - start_pfn); 83 bootmem_paddr = lmb_alloc_base(bootmap_pages << PAGE_SHIFT, 84 PAGE_SIZE, end_pfn); 85 init_bootmem_node(NODE_DATA(nid), bootmem_paddr >> PAGE_SHIFT, 86 start_pfn, end_pfn); 87 88 free_bootmem_with_active_regions(nid, end_pfn); 89 90 /* Reserve the pgdat and bootmap space with the bootmem allocator */ 91 reserve_bootmem_node(NODE_DATA(nid), start_pfn << PAGE_SHIFT, 92 sizeof(struct pglist_data), BOOTMEM_DEFAULT); 93 reserve_bootmem_node(NODE_DATA(nid), bootmem_paddr, 94 bootmap_pages << PAGE_SHIFT, BOOTMEM_DEFAULT); 95 96 /* It's up */ 97 node_set_online(nid); 98 99 /* Kick sparsemem */ 100 sparse_memory_present_with_active_regions(nid); 101 } 102