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/bootmem.h>
  18 #include <linux/efi.h>
  19 #include <linux/mm.h>
  20 #include <linux/swap.h>
  21
  22 #include <asm/meminit.h>
  23 #include <asm/pgalloc.h>
  24 #include <asm/pgtable.h>
  25 #include <asm/sections.h>
  26 #include <asm/mca.h>
  27
  28 #ifdef CONFIG_VIRTUAL_MEM_MAP
  29 static unsigned long max_gap;
  30 #endif
  31
  32 /**
  33  * show_mem - display a memory statistics summary
  34  *
  35  * Just walks the pages in the system and describes where they're allocated.
  36  */
  37 void
  38 show_mem (void)
  39 {
  40         int i, total = 0, reserved = 0;
  41         int shared = 0, cached = 0;
  42
  43         printk(KERN_INFO "Mem-info:\n");
  44         show_free_areas();
  45
  46         printk(KERN_INFO "Free swap:       %6ldkB\n",
  47                nr_swap_pages<<(PAGE_SHIFT-10));
  48         i = max_mapnr;
  49         for (i = 0; i < max_mapnr; i++) {
  50                 if (!pfn_valid(i)) {
  51 #ifdef CONFIG_VIRTUAL_MEM_MAP
  52                         if (max_gap < LARGE_GAP)
  53                                 continue;
  54                         i = vmemmap_find_next_valid_pfn(0, i) - 1;
  55 #endif
  56                         continue;
  57                 }
  58                 total++;
  59                 if (PageReserved(mem_map+i))
  60                         reserved++;
  61                 else if (PageSwapCache(mem_map+i))
  62                         cached++;
  63                 else if (page_count(mem_map + i))
  64                         shared += page_count(mem_map + i) - 1;
  65         }
  66         printk(KERN_INFO "%d pages of RAM\n", total);
  67         printk(KERN_INFO "%d reserved pages\n", reserved);
  68         printk(KERN_INFO "%d pages shared\n", shared);
  69         printk(KERN_INFO "%d pages swap cached\n", cached);
  70         printk(KERN_INFO "%ld pages in page table cache\n",
  71                pgtable_quicklist_total_size());
  72 }
  73
  74 /* physical address where the bootmem map is located */
  75 unsigned long bootmap_start;
  76
  77 /**
  78  * find_max_pfn - adjust the maximum page number callback
  79  * @start: start of range
  80  * @end: end of range
  81  * @arg: address of pointer to global max_pfn variable
  82  *
  83  * Passed as a callback function to efi_memmap_walk() to determine the highest
  84  * available page frame number in the system.
  85  */
  86 int
  87 find_max_pfn (unsigned long start, unsigned long end, void *arg)
  88 {
  89         unsigned long *max_pfnp = arg, pfn;
  90
  91         pfn = (PAGE_ALIGN(end - 1) - PAGE_OFFSET) >> PAGE_SHIFT;
  92         if (pfn > *max_pfnp)
  93                 *max_pfnp = pfn;
  94         return 0;
  95 }
  96
  97 /**
  98  * find_bootmap_location - callback to find a memory area for the bootmap
  99  * @start: start of region
 100  * @end: end of region
 101  * @arg: unused callback data
 102  *
 103  * Find a place to put the bootmap and return its starting address in
 104  * bootmap_start.  This address must be page-aligned.
 105  */
 106 static int __init
 107 find_bootmap_location (unsigned long start, unsigned long end, void *arg)
 108 {
 109         unsigned long needed = *(unsigned long *)arg;
 110         unsigned long range_start, range_end, free_start;
 111         int i;
 112
 113 #if IGNORE_PFN0
 114         if (start == PAGE_OFFSET) {
 115                 start += PAGE_SIZE;
 116                 if (start >= end)
 117                         return 0;
 118         }
 119 #endif
 120
 121         free_start = PAGE_OFFSET;
 122
 123         for (i = 0; i < num_rsvd_regions; i++) {
 124                 range_start = max(start, free_start);
 125                 range_end   = min(end, rsvd_region[i].start & PAGE_MASK);
 126
 127                 free_start = PAGE_ALIGN(rsvd_region[i].end);
 128
 129                 if (range_end <= range_start)
 130                         continue; /* skip over empty range */
 131
 132                 if (range_end - range_start >= needed) {
 133                         bootmap_start = __pa(range_start);
 134                         return -1;      /* done */
 135                 }
 136
 137                 /* nothing more available in this segment */
 138                 if (range_end == end)
 139                         return 0;
 140         }
 141         return 0;
 142 }
 143
 144 /**
 145  * find_memory - setup memory map
 146  *
 147  * Walk the EFI memory map and find usable memory for the system, taking
 148  * into account reserved areas.
 149  */
 150 void __init
 151 find_memory (void)
 152 {
 153         unsigned long bootmap_size;
 154
 155         reserve_memory();
 156
 157         /* first find highest page frame number */
 158         max_pfn = 0;
 159         efi_memmap_walk(find_max_pfn, &max_pfn);
 160
 161         /* how many bytes to cover all the pages */
 162         bootmap_size = bootmem_bootmap_pages(max_pfn) << PAGE_SHIFT;
 163
 164         /* look for a location to hold the bootmap */
 165         bootmap_start = ~0UL;
 166         efi_memmap_walk(find_bootmap_location, &bootmap_size);
 167         if (bootmap_start == ~0UL)
 168                 panic("Cannot find %ld bytes for bootmap\n", bootmap_size);
 169
 170         bootmap_size = init_bootmem(bootmap_start >> PAGE_SHIFT, max_pfn);
 171
 172         /* Free all available memory, then mark bootmem-map as being in use. */
 173         efi_memmap_walk(filter_rsvd_memory, free_bootmem);
 174         reserve_bootmem(bootmap_start, bootmap_size);
 175
 176         find_initrd();
 177 }
 178
 179 #ifdef CONFIG_SMP
 180 /**
 181  * per_cpu_init - setup per-cpu variables
 182  *
 183  * Allocate and setup per-cpu data areas.
 184  */
 185 void * __cpuinit
 186 per_cpu_init (void)
 187 {
 188         void *cpu_data;
 189         int cpu;
 190         static int first_time=1;
 191
 192         /*
 193          * get_free_pages() cannot be used before cpu_init() done.  BSP
 194          * allocates "NR_CPUS" pages for all CPUs to avoid that AP calls
 195          * get_zeroed_page().
 196          */
 197         if (first_time) {
 198                 first_time=0;
 199                 cpu_data = __alloc_bootmem(PERCPU_PAGE_SIZE * NR_CPUS,
 200                                            PERCPU_PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
 201                 for (cpu = 0; cpu < NR_CPUS; cpu++) {
 202                         memcpy(cpu_data, __phys_per_cpu_start, __per_cpu_end - __per_cpu_start);
 203                         __per_cpu_offset[cpu] = (char *) cpu_data - __per_cpu_start;
 204                         cpu_data += PERCPU_PAGE_SIZE;
 205                         per_cpu(local_per_cpu_offset, cpu) = __per_cpu_offset[cpu];
 206                 }
 207         }
 208         return __per_cpu_start + __per_cpu_offset[smp_processor_id()];
 209 }
 210 #endif /* CONFIG_SMP */
 211
 212 static int
 213 count_pages (u64 start, u64 end, void *arg)
 214 {
 215         unsigned long *count = arg;
 216
 217         *count += (end - start) >> PAGE_SHIFT;
 218         return 0;
 219 }
 220
 221 /*
 222  * Set up the page tables.
 223  */
 224
 225 void __init
 226 paging_init (void)
 227 {
 228         unsigned long max_dma;
 229         unsigned long nid = 0;
 230         unsigned long max_zone_pfns[MAX_NR_ZONES];
 231
 232         num_physpages = 0;
 233         efi_memmap_walk(count_pages, &num_physpages);
 234
 235         max_dma = virt_to_phys((void *) MAX_DMA_ADDRESS) >> PAGE_SHIFT;
 236         memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
 237         max_zone_pfns[ZONE_DMA] = max_dma;
 238         max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
 239
 240 #ifdef CONFIG_VIRTUAL_MEM_MAP
 241         efi_memmap_walk(register_active_ranges, &nid);
 242         efi_memmap_walk(find_largest_hole, (u64 *)&max_gap);
 243         if (max_gap < LARGE_GAP) {
 244                 vmem_map = (struct page *) 0;
 245                 free_area_init_nodes(max_zone_pfns);
 246         } else {
 247                 unsigned long map_size;
 248
 249                 /* allocate virtual_mem_map */
 250
 251                 map_size = PAGE_ALIGN(ALIGN(max_low_pfn, MAX_ORDER_NR_PAGES) *
 252                         sizeof(struct page));
 253                 vmalloc_end -= map_size;
 254                 vmem_map = (struct page *) vmalloc_end;
 255                 efi_memmap_walk(create_mem_map_page_table, NULL);
 256
 257                 /*
 258                  * alloc_node_mem_map makes an adjustment for mem_map
 259                  * which isn't compatible with vmem_map.
 260                  */
 261                 NODE_DATA(0)->node_mem_map = vmem_map +
 262                         find_min_pfn_with_active_regions();
 263                 free_area_init_nodes(max_zone_pfns);
 264
 265                 printk("Virtual mem_map starts at 0x%p\n", mem_map);
 266         }
 267 #else /* !CONFIG_VIRTUAL_MEM_MAP */
 268         add_active_range(0, 0, max_low_pfn);
 269         free_area_init_nodes(max_zone_pfns);
 270 #endif /* !CONFIG_VIRTUAL_MEM_MAP */
 271         zero_page_memmap_ptr = virt_to_page(ia64_imva(empty_zero_page));
 272 }