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/config.h> 18 #include <linux/bootmem.h> 19 #include <linux/efi.h> 20 #include <linux/mm.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 num_dma_physpages; 31 #endif 32 33 /** 34 * show_mem - display a memory statistics summary 35 * 36 * Just walks the pages in the system and describes where they're allocated. 37 */ 38 void 39 show_mem (void) 40 { 41 int i, total = 0, reserved = 0; 42 int shared = 0, cached = 0; 43 44 printk("Mem-info:\n"); 45 show_free_areas(); 46 47 printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); 48 i = max_mapnr; 49 while (i-- > 0) { 50 if (!pfn_valid(i)) 51 continue; 52 total++; 53 if (PageReserved(mem_map+i)) 54 reserved++; 55 else if (PageSwapCache(mem_map+i)) 56 cached++; 57 else if (page_count(mem_map + i)) 58 shared += page_count(mem_map + i) - 1; 59 } 60 printk("%d pages of RAM\n", total); 61 printk("%d reserved pages\n", reserved); 62 printk("%d pages shared\n", shared); 63 printk("%d pages swap cached\n", cached); 64 printk("%ld pages in page table cache\n", 65 pgtable_quicklist_total_size()); 66 } 67 68 /* physical address where the bootmem map is located */ 69 unsigned long bootmap_start; 70 71 /** 72 * find_max_pfn - adjust the maximum page number callback 73 * @start: start of range 74 * @end: end of range 75 * @arg: address of pointer to global max_pfn variable 76 * 77 * Passed as a callback function to efi_memmap_walk() to determine the highest 78 * available page frame number in the system. 79 */ 80 int 81 find_max_pfn (unsigned long start, unsigned long end, void *arg) 82 { 83 unsigned long *max_pfnp = arg, pfn; 84 85 pfn = (PAGE_ALIGN(end - 1) - PAGE_OFFSET) >> PAGE_SHIFT; 86 if (pfn > *max_pfnp) 87 *max_pfnp = pfn; 88 return 0; 89 } 90 91 /** 92 * find_bootmap_location - callback to find a memory area for the bootmap 93 * @start: start of region 94 * @end: end of region 95 * @arg: unused callback data 96 * 97 * Find a place to put the bootmap and return its starting address in 98 * bootmap_start. This address must be page-aligned. 99 */ 100 int 101 find_bootmap_location (unsigned long start, unsigned long end, void *arg) 102 { 103 unsigned long needed = *(unsigned long *)arg; 104 unsigned long range_start, range_end, free_start; 105 int i; 106 107 #if IGNORE_PFN0 108 if (start == PAGE_OFFSET) { 109 start += PAGE_SIZE; 110 if (start >= end) 111 return 0; 112 } 113 #endif 114 115 free_start = PAGE_OFFSET; 116 117 for (i = 0; i < num_rsvd_regions; i++) { 118 range_start = max(start, free_start); 119 range_end = min(end, rsvd_region[i].start & PAGE_MASK); 120 121 free_start = PAGE_ALIGN(rsvd_region[i].end); 122 123 if (range_end <= range_start) 124 continue; /* skip over empty range */ 125 126 if (range_end - range_start >= needed) { 127 bootmap_start = __pa(range_start); 128 return -1; /* done */ 129 } 130 131 /* nothing more available in this segment */ 132 if (range_end == end) 133 return 0; 134 } 135 return 0; 136 } 137 138 /** 139 * find_memory - setup memory map 140 * 141 * Walk the EFI memory map and find usable memory for the system, taking 142 * into account reserved areas. 143 */ 144 void 145 find_memory (void) 146 { 147 unsigned long bootmap_size; 148 149 reserve_memory(); 150 151 /* first find highest page frame number */ 152 max_pfn = 0; 153 efi_memmap_walk(find_max_pfn, &max_pfn); 154 155 /* how many bytes to cover all the pages */ 156 bootmap_size = bootmem_bootmap_pages(max_pfn) << PAGE_SHIFT; 157 158 /* look for a location to hold the bootmap */ 159 bootmap_start = ~0UL; 160 efi_memmap_walk(find_bootmap_location, &bootmap_size); 161 if (bootmap_start == ~0UL) 162 panic("Cannot find %ld bytes for bootmap\n", bootmap_size); 163 164 bootmap_size = init_bootmem(bootmap_start >> PAGE_SHIFT, max_pfn); 165 166 /* Free all available memory, then mark bootmem-map as being in use. */ 167 efi_memmap_walk(filter_rsvd_memory, free_bootmem); 168 reserve_bootmem(bootmap_start, bootmap_size); 169 170 find_initrd(); 171 } 172 173 #ifdef CONFIG_SMP 174 /** 175 * per_cpu_init - setup per-cpu variables 176 * 177 * Allocate and setup per-cpu data areas. 178 */ 179 void * 180 per_cpu_init (void) 181 { 182 void *cpu_data; 183 int cpu; 184 185 /* 186 * get_free_pages() cannot be used before cpu_init() done. BSP 187 * allocates "NR_CPUS" pages for all CPUs to avoid that AP calls 188 * get_zeroed_page(). 189 */ 190 if (smp_processor_id() == 0) { 191 cpu_data = __alloc_bootmem(PERCPU_PAGE_SIZE * NR_CPUS, 192 PERCPU_PAGE_SIZE, __pa(MAX_DMA_ADDRESS)); 193 for (cpu = 0; cpu < NR_CPUS; cpu++) { 194 memcpy(cpu_data, __phys_per_cpu_start, __per_cpu_end - __per_cpu_start); 195 __per_cpu_offset[cpu] = (char *) cpu_data - __per_cpu_start; 196 cpu_data += PERCPU_PAGE_SIZE; 197 per_cpu(local_per_cpu_offset, cpu) = __per_cpu_offset[cpu]; 198 } 199 } 200 return __per_cpu_start + __per_cpu_offset[smp_processor_id()]; 201 } 202 #endif /* CONFIG_SMP */ 203 204 static int 205 count_pages (u64 start, u64 end, void *arg) 206 { 207 unsigned long *count = arg; 208 209 *count += (end - start) >> PAGE_SHIFT; 210 return 0; 211 } 212 213 #ifdef CONFIG_VIRTUAL_MEM_MAP 214 static int 215 count_dma_pages (u64 start, u64 end, void *arg) 216 { 217 unsigned long *count = arg; 218 219 if (start < MAX_DMA_ADDRESS) 220 *count += (min(end, MAX_DMA_ADDRESS) - start) >> PAGE_SHIFT; 221 return 0; 222 } 223 #endif 224 225 /* 226 * Set up the page tables. 227 */ 228 229 void 230 paging_init (void) 231 { 232 unsigned long max_dma; 233 unsigned long zones_size[MAX_NR_ZONES]; 234 #ifdef CONFIG_VIRTUAL_MEM_MAP 235 unsigned long zholes_size[MAX_NR_ZONES]; 236 unsigned long max_gap; 237 #endif 238 239 /* initialize mem_map[] */ 240 241 memset(zones_size, 0, sizeof(zones_size)); 242 243 num_physpages = 0; 244 efi_memmap_walk(count_pages, &num_physpages); 245 246 max_dma = virt_to_phys((void *) MAX_DMA_ADDRESS) >> PAGE_SHIFT; 247 248 #ifdef CONFIG_VIRTUAL_MEM_MAP 249 memset(zholes_size, 0, sizeof(zholes_size)); 250 251 num_dma_physpages = 0; 252 efi_memmap_walk(count_dma_pages, &num_dma_physpages); 253 254 if (max_low_pfn < max_dma) { 255 zones_size[ZONE_DMA] = max_low_pfn; 256 zholes_size[ZONE_DMA] = max_low_pfn - num_dma_physpages; 257 } else { 258 zones_size[ZONE_DMA] = max_dma; 259 zholes_size[ZONE_DMA] = max_dma - num_dma_physpages; 260 if (num_physpages > num_dma_physpages) { 261 zones_size[ZONE_NORMAL] = max_low_pfn - max_dma; 262 zholes_size[ZONE_NORMAL] = 263 ((max_low_pfn - max_dma) - 264 (num_physpages - num_dma_physpages)); 265 } 266 } 267 268 max_gap = 0; 269 efi_memmap_walk(find_largest_hole, (u64 *)&max_gap); 270 if (max_gap < LARGE_GAP) { 271 vmem_map = (struct page *) 0; 272 free_area_init_node(0, NODE_DATA(0), zones_size, 0, 273 zholes_size); 274 } else { 275 unsigned long map_size; 276 277 /* allocate virtual_mem_map */ 278 279 map_size = PAGE_ALIGN(max_low_pfn * sizeof(struct page)); 280 vmalloc_end -= map_size; 281 vmem_map = (struct page *) vmalloc_end; 282 efi_memmap_walk(create_mem_map_page_table, NULL); 283 284 NODE_DATA(0)->node_mem_map = vmem_map; 285 free_area_init_node(0, NODE_DATA(0), zones_size, 286 0, zholes_size); 287 288 printk("Virtual mem_map starts at 0x%p\n", mem_map); 289 } 290 #else /* !CONFIG_VIRTUAL_MEM_MAP */ 291 if (max_low_pfn < max_dma) 292 zones_size[ZONE_DMA] = max_low_pfn; 293 else { 294 zones_size[ZONE_DMA] = max_dma; 295 zones_size[ZONE_NORMAL] = max_low_pfn - max_dma; 296 } 297 free_area_init(zones_size); 298 #endif /* !CONFIG_VIRTUAL_MEM_MAP */ 299 zero_page_memmap_ptr = virt_to_page(ia64_imva(empty_zero_page)); 300 } 301