1 /* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive 4 * for more details. 5 * 6 * Copyright (C) 1998-2003 Hewlett-Packard Co 7 * David Mosberger-Tang <davidm@hpl.hp.com> 8 * Stephane Eranian <eranian@hpl.hp.com> 9 * Copyright (C) 2000, Rohit Seth <rohit.seth@intel.com> 10 * Copyright (C) 1999 VA Linux Systems 11 * Copyright (C) 1999 Walt Drummond <drummond@valinux.com> 12 * Copyright (C) 2003 Silicon Graphics, Inc. All rights reserved. 13 * 14 * Routines used by ia64 machines with contiguous (or virtually contiguous) 15 * memory. 16 */ 17 #include <linux/bootmem.h> 18 #include <linux/efi.h> 19 #include <linux/mm.h> 20 #include <linux/nmi.h> 21 #include <linux/swap.h> 22 23 #include <asm/meminit.h> 24 #include <asm/pgalloc.h> 25 #include <asm/pgtable.h> 26 #include <asm/sections.h> 27 #include <asm/mca.h> 28 29 #ifdef CONFIG_VIRTUAL_MEM_MAP 30 static unsigned long max_gap; 31 #endif 32 33 /** 34 * show_mem - give short summary of memory stats 35 * 36 * Shows a simple page count of reserved and used pages in the system. 37 * For discontig machines, it does this on a per-pgdat basis. 38 */ 39 void show_mem(void) 40 { 41 int i, total_reserved = 0; 42 int total_shared = 0, total_cached = 0; 43 unsigned long total_present = 0; 44 pg_data_t *pgdat; 45 46 printk(KERN_INFO "Mem-info:\n"); 47 show_free_areas(); 48 printk(KERN_INFO "Free swap: %6ldkB\n", 49 nr_swap_pages<<(PAGE_SHIFT-10)); 50 printk(KERN_INFO "Node memory in pages:\n"); 51 for_each_online_pgdat(pgdat) { 52 unsigned long present; 53 unsigned long flags; 54 int shared = 0, cached = 0, reserved = 0; 55 56 pgdat_resize_lock(pgdat, &flags); 57 present = pgdat->node_present_pages; 58 for(i = 0; i < pgdat->node_spanned_pages; i++) { 59 struct page *page; 60 if (unlikely(i % MAX_ORDER_NR_PAGES == 0)) 61 touch_nmi_watchdog(); 62 if (pfn_valid(pgdat->node_start_pfn + i)) 63 page = pfn_to_page(pgdat->node_start_pfn + i); 64 else { 65 #ifdef CONFIG_VIRTUAL_MEM_MAP 66 if (max_gap < LARGE_GAP) 67 continue; 68 #endif 69 i = vmemmap_find_next_valid_pfn(pgdat->node_id, 70 i) - 1; 71 continue; 72 } 73 if (PageReserved(page)) 74 reserved++; 75 else if (PageSwapCache(page)) 76 cached++; 77 else if (page_count(page)) 78 shared += page_count(page)-1; 79 } 80 pgdat_resize_unlock(pgdat, &flags); 81 total_present += present; 82 total_reserved += reserved; 83 total_cached += cached; 84 total_shared += shared; 85 printk(KERN_INFO "Node %4d: RAM: %11ld, rsvd: %8d, " 86 "shrd: %10d, swpd: %10d\n", pgdat->node_id, 87 present, reserved, shared, cached); 88 } 89 printk(KERN_INFO "%ld pages of RAM\n", total_present); 90 printk(KERN_INFO "%d reserved pages\n", total_reserved); 91 printk(KERN_INFO "%d pages shared\n", total_shared); 92 printk(KERN_INFO "%d pages swap cached\n", total_cached); 93 printk(KERN_INFO "Total of %ld pages in page table cache\n", 94 quicklist_total_size()); 95 printk(KERN_INFO "%d free buffer pages\n", nr_free_buffer_pages()); 96 } 97 98 99 /* physical address where the bootmem map is located */ 100 unsigned long bootmap_start; 101 102 /** 103 * find_bootmap_location - callback to find a memory area for the bootmap 104 * @start: start of region 105 * @end: end of region 106 * @arg: unused callback data 107 * 108 * Find a place to put the bootmap and return its starting address in 109 * bootmap_start. This address must be page-aligned. 110 */ 111 static int __init 112 find_bootmap_location (unsigned long start, unsigned long end, void *arg) 113 { 114 unsigned long needed = *(unsigned long *)arg; 115 unsigned long range_start, range_end, free_start; 116 int i; 117 118 #if IGNORE_PFN0 119 if (start == PAGE_OFFSET) { 120 start += PAGE_SIZE; 121 if (start >= end) 122 return 0; 123 } 124 #endif 125 126 free_start = PAGE_OFFSET; 127 128 for (i = 0; i < num_rsvd_regions; i++) { 129 range_start = max(start, free_start); 130 range_end = min(end, rsvd_region[i].start & PAGE_MASK); 131 132 free_start = PAGE_ALIGN(rsvd_region[i].end); 133 134 if (range_end <= range_start) 135 continue; /* skip over empty range */ 136 137 if (range_end - range_start >= needed) { 138 bootmap_start = __pa(range_start); 139 return -1; /* done */ 140 } 141 142 /* nothing more available in this segment */ 143 if (range_end == end) 144 return 0; 145 } 146 return 0; 147 } 148 149 #ifdef CONFIG_SMP 150 static void *cpu_data; 151 /** 152 * per_cpu_init - setup per-cpu variables 153 * 154 * Allocate and setup per-cpu data areas. 155 */ 156 void * __cpuinit 157 per_cpu_init (void) 158 { 159 int cpu; 160 static int first_time=1; 161 162 /* 163 * get_free_pages() cannot be used before cpu_init() done. BSP 164 * allocates "NR_CPUS" pages for all CPUs to avoid that AP calls 165 * get_zeroed_page(). 166 */ 167 if (first_time) { 168 first_time=0; 169 for (cpu = 0; cpu < NR_CPUS; cpu++) { 170 memcpy(cpu_data, __phys_per_cpu_start, __per_cpu_end - __per_cpu_start); 171 __per_cpu_offset[cpu] = (char *) cpu_data - __per_cpu_start; 172 cpu_data += PERCPU_PAGE_SIZE; 173 per_cpu(local_per_cpu_offset, cpu) = __per_cpu_offset[cpu]; 174 } 175 } 176 return __per_cpu_start + __per_cpu_offset[smp_processor_id()]; 177 } 178 179 static inline void 180 alloc_per_cpu_data(void) 181 { 182 cpu_data = __alloc_bootmem(PERCPU_PAGE_SIZE * NR_CPUS, 183 PERCPU_PAGE_SIZE, __pa(MAX_DMA_ADDRESS)); 184 } 185 #else 186 #define alloc_per_cpu_data() do { } while (0) 187 #endif /* CONFIG_SMP */ 188 189 /** 190 * find_memory - setup memory map 191 * 192 * Walk the EFI memory map and find usable memory for the system, taking 193 * into account reserved areas. 194 */ 195 void __init 196 find_memory (void) 197 { 198 unsigned long bootmap_size; 199 200 reserve_memory(); 201 202 /* first find highest page frame number */ 203 min_low_pfn = ~0UL; 204 max_low_pfn = 0; 205 efi_memmap_walk(find_max_min_low_pfn, NULL); 206 max_pfn = max_low_pfn; 207 /* how many bytes to cover all the pages */ 208 bootmap_size = bootmem_bootmap_pages(max_pfn) << PAGE_SHIFT; 209 210 /* look for a location to hold the bootmap */ 211 bootmap_start = ~0UL; 212 efi_memmap_walk(find_bootmap_location, &bootmap_size); 213 if (bootmap_start == ~0UL) 214 panic("Cannot find %ld bytes for bootmap\n", bootmap_size); 215 216 bootmap_size = init_bootmem_node(NODE_DATA(0), 217 (bootmap_start >> PAGE_SHIFT), 0, max_pfn); 218 219 /* Free all available memory, then mark bootmem-map as being in use. */ 220 efi_memmap_walk(filter_rsvd_memory, free_bootmem); 221 reserve_bootmem(bootmap_start, bootmap_size); 222 223 find_initrd(); 224 225 alloc_per_cpu_data(); 226 } 227 228 static int 229 count_pages (u64 start, u64 end, void *arg) 230 { 231 unsigned long *count = arg; 232 233 *count += (end - start) >> PAGE_SHIFT; 234 return 0; 235 } 236 237 /* 238 * Set up the page tables. 239 */ 240 241 void __init 242 paging_init (void) 243 { 244 unsigned long max_dma; 245 unsigned long max_zone_pfns[MAX_NR_ZONES]; 246 247 num_physpages = 0; 248 efi_memmap_walk(count_pages, &num_physpages); 249 250 memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); 251 #ifdef CONFIG_ZONE_DMA 252 max_dma = virt_to_phys((void *) MAX_DMA_ADDRESS) >> PAGE_SHIFT; 253 max_zone_pfns[ZONE_DMA] = max_dma; 254 #endif 255 max_zone_pfns[ZONE_NORMAL] = max_low_pfn; 256 257 #ifdef CONFIG_VIRTUAL_MEM_MAP 258 efi_memmap_walk(register_active_ranges, NULL); 259 efi_memmap_walk(find_largest_hole, (u64 *)&max_gap); 260 if (max_gap < LARGE_GAP) { 261 vmem_map = (struct page *) 0; 262 free_area_init_nodes(max_zone_pfns); 263 } else { 264 unsigned long map_size; 265 266 /* allocate virtual_mem_map */ 267 268 map_size = PAGE_ALIGN(ALIGN(max_low_pfn, MAX_ORDER_NR_PAGES) * 269 sizeof(struct page)); 270 vmalloc_end -= map_size; 271 vmem_map = (struct page *) vmalloc_end; 272 efi_memmap_walk(create_mem_map_page_table, NULL); 273 274 /* 275 * alloc_node_mem_map makes an adjustment for mem_map 276 * which isn't compatible with vmem_map. 277 */ 278 NODE_DATA(0)->node_mem_map = vmem_map + 279 find_min_pfn_with_active_regions(); 280 free_area_init_nodes(max_zone_pfns); 281 282 printk("Virtual mem_map starts at 0x%p\n", mem_map); 283 } 284 #else /* !CONFIG_VIRTUAL_MEM_MAP */ 285 add_active_range(0, 0, max_low_pfn); 286 free_area_init_nodes(max_zone_pfns); 287 #endif /* !CONFIG_VIRTUAL_MEM_MAP */ 288 zero_page_memmap_ptr = virt_to_page(ia64_imva(empty_zero_page)); 289 } 290