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/bootmem.h>
  26 #include <linux/memblock.h>
  27 #include <linux/module.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  */
  44 s8 physnode_map[MAX_SECTIONS] __read_mostly = { [0 ... (MAX_SECTIONS - 1)] = -1};
  45 EXPORT_SYMBOL(physnode_map);
  46
  47 void 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
  64 unsigned 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
  76 extern unsigned long highend_pfn, highstart_pfn;
  77
  78 void __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         setup_bootmem_allocator();
 104 }