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