arch/ia64/mm/contig.c

   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 }