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 "Node memory in pages:\n"); 49 for_each_online_pgdat(pgdat) { 50 unsigned long present; 51 unsigned long flags; 52 int shared = 0, cached = 0, reserved = 0; 53 54 pgdat_resize_lock(pgdat, &flags); 55 present = pgdat->node_present_pages; 56 for(i = 0; i < pgdat->node_spanned_pages; i++) { 57 struct page *page; 58 if (unlikely(i % MAX_ORDER_NR_PAGES == 0)) 59 touch_nmi_watchdog(); 60 if (pfn_valid(pgdat->node_start_pfn + i)) 61 page = pfn_to_page(pgdat->node_start_pfn + i); 62 else { 63 #ifdef CONFIG_VIRTUAL_MEM_MAP 64 if (max_gap < LARGE_GAP) 65 continue; 66 #endif 67 i = vmemmap_find_next_valid_pfn(pgdat->node_id, 68 i) - 1; 69 continue; 70 } 71 if (PageReserved(page)) 72 reserved++; 73 else if (PageSwapCache(page)) 74 cached++; 75 else if (page_count(page)) 76 shared += page_count(page)-1; 77 } 78 pgdat_resize_unlock(pgdat, &flags); 79 total_present += present; 80 total_reserved += reserved; 81 total_cached += cached; 82 total_shared += shared; 83 printk(KERN_INFO "Node %4d: RAM: %11ld, rsvd: %8d, " 84 "shrd: %10d, swpd: %10d\n", pgdat->node_id, 85 present, reserved, shared, cached); 86 } 87 printk(KERN_INFO "%ld pages of RAM\n", total_present); 88 printk(KERN_INFO "%d reserved pages\n", total_reserved); 89 printk(KERN_INFO "%d pages shared\n", total_shared); 90 printk(KERN_INFO "%d pages swap cached\n", total_cached); 91 printk(KERN_INFO "Total of %ld pages in page table cache\n", 92 quicklist_total_size()); 93 printk(KERN_INFO "%d free buffer pages\n", nr_free_buffer_pages()); 94 } 95 96 97 /* physical address where the bootmem map is located */ 98 unsigned long bootmap_start; 99 100 /** 101 * find_bootmap_location - callback to find a memory area for the bootmap 102 * @start: start of region 103 * @end: end of region 104 * @arg: unused callback data 105 * 106 * Find a place to put the bootmap and return its starting address in 107 * bootmap_start. This address must be page-aligned. 108 */ 109 static int __init 110 find_bootmap_location (unsigned long start, unsigned long end, void *arg) 111 { 112 unsigned long needed = *(unsigned long *)arg; 113 unsigned long range_start, range_end, free_start; 114 int i; 115 116 #if IGNORE_PFN0 117 if (start == PAGE_OFFSET) { 118 start += PAGE_SIZE; 119 if (start >= end) 120 return 0; 121 } 122 #endif 123 124 free_start = PAGE_OFFSET; 125 126 for (i = 0; i < num_rsvd_regions; i++) { 127 range_start = max(start, free_start); 128 range_end = min(end, rsvd_region[i].start & PAGE_MASK); 129 130 free_start = PAGE_ALIGN(rsvd_region[i].end); 131 132 if (range_end <= range_start) 133 continue; /* skip over empty range */ 134 135 if (range_end - range_start >= needed) { 136 bootmap_start = __pa(range_start); 137 return -1; /* done */ 138 } 139 140 /* nothing more available in this segment */ 141 if (range_end == end) 142 return 0; 143 } 144 return 0; 145 } 146 147 #ifdef CONFIG_SMP 148 static void *cpu_data; 149 /** 150 * per_cpu_init - setup per-cpu variables 151 * 152 * Allocate and setup per-cpu data areas. 153 */ 154 void * __cpuinit 155 per_cpu_init (void) 156 { 157 int cpu; 158 static int first_time=1; 159 160 /* 161 * get_free_pages() cannot be used before cpu_init() done. BSP 162 * allocates "NR_CPUS" pages for all CPUs to avoid that AP calls 163 * get_zeroed_page(). 164 */ 165 if (first_time) { 166 first_time=0; 167 for (cpu = 0; cpu < NR_CPUS; cpu++) { 168 memcpy(cpu_data, __phys_per_cpu_start, __per_cpu_end - __per_cpu_start); 169 __per_cpu_offset[cpu] = (char *) cpu_data - __per_cpu_start; 170 cpu_data += PERCPU_PAGE_SIZE; 171 per_cpu(local_per_cpu_offset, cpu) = __per_cpu_offset[cpu]; 172 } 173 } 174 return __per_cpu_start + __per_cpu_offset[smp_processor_id()]; 175 } 176 177 static inline void 178 alloc_per_cpu_data(void) 179 { 180 cpu_data = __alloc_bootmem(PERCPU_PAGE_SIZE * NR_CPUS, 181 PERCPU_PAGE_SIZE, __pa(MAX_DMA_ADDRESS)); 182 } 183 #else 184 #define alloc_per_cpu_data() do { } while (0) 185 #endif /* CONFIG_SMP */ 186 187 /** 188 * find_memory - setup memory map 189 * 190 * Walk the EFI memory map and find usable memory for the system, taking 191 * into account reserved areas. 192 */ 193 void __init 194 find_memory (void) 195 { 196 unsigned long bootmap_size; 197 198 reserve_memory(); 199 200 /* first find highest page frame number */ 201 min_low_pfn = ~0UL; 202 max_low_pfn = 0; 203 efi_memmap_walk(find_max_min_low_pfn, NULL); 204 max_pfn = max_low_pfn; 205 /* how many bytes to cover all the pages */ 206 bootmap_size = bootmem_bootmap_pages(max_pfn) << PAGE_SHIFT; 207 208 /* look for a location to hold the bootmap */ 209 bootmap_start = ~0UL; 210 efi_memmap_walk(find_bootmap_location, &bootmap_size); 211 if (bootmap_start == ~0UL) 212 panic("Cannot find %ld bytes for bootmap\n", bootmap_size); 213 214 bootmap_size = init_bootmem_node(NODE_DATA(0), 215 (bootmap_start >> PAGE_SHIFT), 0, max_pfn); 216 217 /* Free all available memory, then mark bootmem-map as being in use. */ 218 efi_memmap_walk(filter_rsvd_memory, free_bootmem); 219 reserve_bootmem(bootmap_start, bootmap_size, BOOTMEM_DEFAULT); 220 221 find_initrd(); 222 223 alloc_per_cpu_data(); 224 } 225 226 static int 227 count_pages (u64 start, u64 end, void *arg) 228 { 229 unsigned long *count = arg; 230 231 *count += (end - start) >> PAGE_SHIFT; 232 return 0; 233 } 234 235 /* 236 * Set up the page tables. 237 */ 238 239 void __init 240 paging_init (void) 241 { 242 unsigned long max_dma; 243 unsigned long max_zone_pfns[MAX_NR_ZONES]; 244 245 num_physpages = 0; 246 efi_memmap_walk(count_pages, &num_physpages); 247 248 memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); 249 #ifdef CONFIG_ZONE_DMA 250 max_dma = virt_to_phys((void *) MAX_DMA_ADDRESS) >> PAGE_SHIFT; 251 max_zone_pfns[ZONE_DMA] = max_dma; 252 #endif 253 max_zone_pfns[ZONE_NORMAL] = max_low_pfn; 254 255 #ifdef CONFIG_VIRTUAL_MEM_MAP 256 efi_memmap_walk(filter_memory, register_active_ranges); 257 efi_memmap_walk(find_largest_hole, (u64 *)&max_gap); 258 if (max_gap < LARGE_GAP) { 259 vmem_map = (struct page *) 0; 260 free_area_init_nodes(max_zone_pfns); 261 } else { 262 unsigned long map_size; 263 264 /* allocate virtual_mem_map */ 265 266 map_size = PAGE_ALIGN(ALIGN(max_low_pfn, MAX_ORDER_NR_PAGES) * 267 sizeof(struct page)); 268 vmalloc_end -= map_size; 269 vmem_map = (struct page *) vmalloc_end; 270 efi_memmap_walk(create_mem_map_page_table, NULL); 271 272 /* 273 * alloc_node_mem_map makes an adjustment for mem_map 274 * which isn't compatible with vmem_map. 275 */ 276 NODE_DATA(0)->node_mem_map = vmem_map + 277 find_min_pfn_with_active_regions(); 278 free_area_init_nodes(max_zone_pfns); 279 280 printk("Virtual mem_map starts at 0x%p\n", mem_map); 281 } 282 #else /* !CONFIG_VIRTUAL_MEM_MAP */ 283 add_active_range(0, 0, max_low_pfn); 284 free_area_init_nodes(max_zone_pfns); 285 #endif /* !CONFIG_VIRTUAL_MEM_MAP */ 286 zero_page_memmap_ptr = virt_to_page(ia64_imva(empty_zero_page)); 287 } 288