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 void *cpu0_data = __cpu0_per_cpu; 167 168 first_time=0; 169 170 __per_cpu_offset[0] = (char *) cpu0_data - __per_cpu_start; 171 per_cpu(local_per_cpu_offset, 0) = __per_cpu_offset[0]; 172 173 for (cpu = 1; cpu < NR_CPUS; cpu++) { 174 memcpy(cpu_data, __phys_per_cpu_start, __per_cpu_end - __per_cpu_start); 175 __per_cpu_offset[cpu] = (char *) cpu_data - __per_cpu_start; 176 cpu_data += PERCPU_PAGE_SIZE; 177 per_cpu(local_per_cpu_offset, cpu) = __per_cpu_offset[cpu]; 178 } 179 } 180 return __per_cpu_start + __per_cpu_offset[smp_processor_id()]; 181 } 182 183 static inline void 184 alloc_per_cpu_data(void) 185 { 186 cpu_data = __alloc_bootmem(PERCPU_PAGE_SIZE * NR_CPUS-1, 187 PERCPU_PAGE_SIZE, __pa(MAX_DMA_ADDRESS)); 188 } 189 #else 190 #define alloc_per_cpu_data() do { } while (0) 191 #endif /* CONFIG_SMP */ 192 193 /** 194 * find_memory - setup memory map 195 * 196 * Walk the EFI memory map and find usable memory for the system, taking 197 * into account reserved areas. 198 */ 199 void __init 200 find_memory (void) 201 { 202 unsigned long bootmap_size; 203 204 reserve_memory(); 205 206 /* first find highest page frame number */ 207 min_low_pfn = ~0UL; 208 max_low_pfn = 0; 209 efi_memmap_walk(find_max_min_low_pfn, NULL); 210 max_pfn = max_low_pfn; 211 /* how many bytes to cover all the pages */ 212 bootmap_size = bootmem_bootmap_pages(max_pfn) << PAGE_SHIFT; 213 214 /* look for a location to hold the bootmap */ 215 bootmap_start = ~0UL; 216 efi_memmap_walk(find_bootmap_location, &bootmap_size); 217 if (bootmap_start == ~0UL) 218 panic("Cannot find %ld bytes for bootmap\n", bootmap_size); 219 220 bootmap_size = init_bootmem_node(NODE_DATA(0), 221 (bootmap_start >> PAGE_SHIFT), 0, max_pfn); 222 223 /* Free all available memory, then mark bootmem-map as being in use. */ 224 efi_memmap_walk(filter_rsvd_memory, free_bootmem); 225 reserve_bootmem(bootmap_start, bootmap_size, BOOTMEM_DEFAULT); 226 227 find_initrd(); 228 229 alloc_per_cpu_data(); 230 } 231 232 static int 233 count_pages (u64 start, u64 end, void *arg) 234 { 235 unsigned long *count = arg; 236 237 *count += (end - start) >> PAGE_SHIFT; 238 return 0; 239 } 240 241 /* 242 * Set up the page tables. 243 */ 244 245 void __init 246 paging_init (void) 247 { 248 unsigned long max_dma; 249 unsigned long max_zone_pfns[MAX_NR_ZONES]; 250 251 num_physpages = 0; 252 efi_memmap_walk(count_pages, &num_physpages); 253 254 memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); 255 #ifdef CONFIG_ZONE_DMA 256 max_dma = virt_to_phys((void *) MAX_DMA_ADDRESS) >> PAGE_SHIFT; 257 max_zone_pfns[ZONE_DMA] = max_dma; 258 #endif 259 max_zone_pfns[ZONE_NORMAL] = max_low_pfn; 260 261 #ifdef CONFIG_VIRTUAL_MEM_MAP 262 efi_memmap_walk(filter_memory, register_active_ranges); 263 efi_memmap_walk(find_largest_hole, (u64 *)&max_gap); 264 if (max_gap < LARGE_GAP) { 265 vmem_map = (struct page *) 0; 266 free_area_init_nodes(max_zone_pfns); 267 } else { 268 unsigned long map_size; 269 270 /* allocate virtual_mem_map */ 271 272 map_size = PAGE_ALIGN(ALIGN(max_low_pfn, MAX_ORDER_NR_PAGES) * 273 sizeof(struct page)); 274 vmalloc_end -= map_size; 275 vmem_map = (struct page *) vmalloc_end; 276 efi_memmap_walk(create_mem_map_page_table, NULL); 277 278 /* 279 * alloc_node_mem_map makes an adjustment for mem_map 280 * which isn't compatible with vmem_map. 281 */ 282 NODE_DATA(0)->node_mem_map = vmem_map + 283 find_min_pfn_with_active_regions(); 284 free_area_init_nodes(max_zone_pfns); 285 286 printk("Virtual mem_map starts at 0x%p\n", mem_map); 287 } 288 #else /* !CONFIG_VIRTUAL_MEM_MAP */ 289 add_active_range(0, 0, max_low_pfn); 290 free_area_init_nodes(max_zone_pfns); 291 #endif /* !CONFIG_VIRTUAL_MEM_MAP */ 292 zero_page_memmap_ptr = virt_to_page(ia64_imva(empty_zero_page)); 293 } 294