arch/x86/mm/numa_32.c

   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/memblock.h>
  26 #include <linux/init.h>
  27
  28 #include "numa_internal.h"
  29
  30 #ifdef CONFIG_DISCONTIGMEM
  31 /*
  32  * 4) physnode_map     - the mapping between a pfn and owning node
  33  * physnode_map keeps track of the physical memory layout of a generic
  34  * numa node on a 64Mb break (each element of the array will
  35  * represent 64Mb of memory and will be marked by the node id.  so,
  36  * if the first gig is on node 0, and the second gig is on node 1
  37  * physnode_map will contain:
  38  *
  39  *     physnode_map[0-15] = 0;
  40  *     physnode_map[16-31] = 1;
  41  *     physnode_map[32- ] = -1;
  42  */
  43 s8 physnode_map[MAX_SECTIONS] __read_mostly = { [0 ... (MAX_SECTIONS - 1)] = -1};
  44 EXPORT_SYMBOL(physnode_map);
  45
  46 void memory_present(int nid, unsigned long start, unsigned long end)
  47 {
  48         unsigned long pfn;
  49
  50         printk(KERN_INFO "Node: %d, start_pfn: %lx, end_pfn: %lx\n",
  51                         nid, start, end);
  52         printk(KERN_DEBUG "  Setting physnode_map array to node %d for pfns:\n", nid);
  53         printk(KERN_DEBUG "  ");
  54         start = round_down(start, PAGES_PER_SECTION);
  55         end = round_up(end, PAGES_PER_SECTION);
  56         for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION) {
  57                 physnode_map[pfn / PAGES_PER_SECTION] = nid;
  58                 printk(KERN_CONT "%lx ", pfn);
  59         }
  60         printk(KERN_CONT "\n");
  61 }
  62 #endif
  63
  64 extern unsigned long highend_pfn, highstart_pfn;
  65
  66 void __init initmem_init(void)
  67 {
  68         x86_numa_init();
  69
  70 #ifdef CONFIG_HIGHMEM
  71         highstart_pfn = highend_pfn = max_pfn;
  72         if (max_pfn > max_low_pfn)
  73                 highstart_pfn = max_low_pfn;
  74         printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
  75                pages_to_mb(highend_pfn - highstart_pfn));
  76         high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1;
  77 #else
  78         high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1;
  79 #endif
  80         printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
  81                         pages_to_mb(max_low_pfn));
  82         printk(KERN_DEBUG "max_low_pfn = %lx, highstart_pfn = %lx\n",
  83                         max_low_pfn, highstart_pfn);
  84
  85         printk(KERN_DEBUG "Low memory ends at vaddr %08lx\n",
  86                         (ulong) pfn_to_kaddr(max_low_pfn));
  87
  88         printk(KERN_DEBUG "High memory starts at vaddr %08lx\n",
  89                         (ulong) pfn_to_kaddr(highstart_pfn));
  90
  91         __vmalloc_start_set = true;
  92         setup_bootmem_allocator();
  93 }