LXR linux/arch/x86/mm/numa

   1/*
   2 * Written by: Patricia Gaughen <gone@us.ibm.com>, IBM Corporation
   3 * August 2002: added remote node KVA remap - Martin J. Bligh 
   4 *
   5 * Copyright (C) 2002, IBM Corp.
   6 *
   7 * All rights reserved.          
   8 *
   9 * This program is free software; you can redistribute it and/or modify
  10 * it under the terms of the GNU General Public License as published by
  11 * the Free Software Foundation; either version 2 of the License, or
  12 * (at your option) any later version.
  13 *
  14 * This program is distributed in the hope that it will be useful, but
  15 * WITHOUT ANY WARRANTY; without even the implied warranty of
  16 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  17 * NON INFRINGEMENT.  See the GNU General Public License for more
  18 * details.
  19 *
  20 * You should have received a copy of the GNU General Public License
  21 * along with this program; if not, write to the Free Software
  22 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23 */
  24
  25#include <linux/bootmem.h>
  26#include <linux/memblock.h>
  27#include <linux/init.h>
  28
  29#include "numa_internal.h"
  30
  31#ifdef CONFIG_DISCONTIGMEM
  32/*
  33 * 4) physnode_map     - the mapping between a pfn and owning node
  34 * physnode_map keeps track of the physical memory layout of a generic
  35 * numa node on a 64Mb break (each element of the array will
  36 * represent 64Mb of memory and will be marked by the node id.  so,
  37 * if the first gig is on node 0, and the second gig is on node 1
  38 * physnode_map will contain:
  39 *
  40 *     physnode_map[0-15] = 0;
  41 *     physnode_map[16-31] = 1;
  42 *     physnode_map[32- ] = -1;
  43 */
  44s8 physnode_map[MAX_SECTIONS] __read_mostly = { [0 ... (MAX_SECTIONS - 1)] = -1};
  45EXPORT_SYMBOL(physnode_map);
  46
  47void memory_present(int nid, unsigned long start, unsigned long end)
  48{
  49        unsigned long pfn;
  50
  51        printk(KERN_INFO "Node: %d, start_pfn: %lx, end_pfn: %lx\n",
  52                        nid, start, end);
  53        printk(KERN_DEBUG "  Setting physnode_map array to node %d for pfns:\n", nid);
  54        printk(KERN_DEBUG "  ");
  55        start = round_down(start, PAGES_PER_SECTION);
  56        end = round_up(end, PAGES_PER_SECTION);
  57        for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION) {
  58                physnode_map[pfn / PAGES_PER_SECTION] = nid;
  59                printk(KERN_CONT "%lx ", pfn);
  60        }
  61        printk(KERN_CONT "\n");
  62}
  63
  64unsigned long node_memmap_size_bytes(int nid, unsigned long start_pfn,
  65                                              unsigned long end_pfn)
  66{
  67        unsigned long nr_pages = end_pfn - start_pfn;
  68
  69        if (!nr_pages)
  70                return 0;
  71
  72        return (nr_pages + 1) * sizeof(struct page);
  73}
  74#endif
  75
  76extern unsigned long highend_pfn, highstart_pfn;
  77
  78void __init initmem_init(void)
  79{
  80        x86_numa_init();
  81
  82#ifdef CONFIG_HIGHMEM
  83        highstart_pfn = highend_pfn = max_pfn;
  84        if (max_pfn > max_low_pfn)
  85                highstart_pfn = max_low_pfn;
  86        printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
  87               pages_to_mb(highend_pfn - highstart_pfn));
  88        high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1;
  89#else
  90        high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1;
  91#endif
  92        printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
  93                        pages_to_mb(max_low_pfn));
  94        printk(KERN_DEBUG "max_low_pfn = %lx, highstart_pfn = %lx\n",
  95                        max_low_pfn, highstart_pfn);
  96
  97        printk(KERN_DEBUG "Low memory ends at vaddr %08lx\n",
  98                        (ulong) pfn_to_kaddr(max_low_pfn));
  99
 100        printk(KERN_DEBUG "High memory starts at vaddr %08lx\n",
 101                        (ulong) pfn_to_kaddr(highstart_pfn));
 102
 103        __vmalloc_start_set = true;
 104        setup_bootmem_allocator();
 105}
 106