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",
  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, &contig_page_data, 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, &contig_page_data, 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 }