arch/i386/kernel/numaq.c

   1 /*
   2  * Written by: Patricia Gaughen, IBM Corporation
   3  *
   4  * Copyright (C) 2002, IBM Corp.
   5  *
   6  * All rights reserved.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  16  * NON INFRINGEMENT.  See the GNU General Public License for more
  17  * details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  *
  23  * Send feedback to <gone@us.ibm.com>
  24  */
  25
  26 #include <linux/config.h>
  27 #include <linux/mm.h>
  28 #include <linux/bootmem.h>
  29 #include <linux/mmzone.h>
  30 #include <linux/module.h>
  31 #include <linux/nodemask.h>
  32 #include <asm/numaq.h>
  33 #include <asm/topology.h>
  34
  35 #define MB_TO_PAGES(addr) ((addr) << (20 - PAGE_SHIFT))
  36
  37 /*
  38  * Function: smp_dump_qct()
  39  *
  40  * Description: gets memory layout from the quad config table.  This
  41  * function also updates node_online_map with the nodes (quads) present.
  42  */
  43 static void __init smp_dump_qct(void)
  44 {
  45         int node;
  46         struct eachquadmem *eq;
  47         struct sys_cfg_data *scd =
  48                 (struct sys_cfg_data *)__va(SYS_CFG_DATA_PRIV_ADDR);
  49
  50         nodes_clear(node_online_map);
  51         for_each_node(node) {
  52                 if (scd->quads_present31_0 & (1 << node)) {
  53                         node_set_online(node);
  54                         eq = &scd->eq[node];
  55                         /* Convert to pages */
  56                         node_start_pfn[node] = MB_TO_PAGES(
  57                                 eq->hi_shrd_mem_start - eq->priv_mem_size);
  58                         node_end_pfn[node] = MB_TO_PAGES(
  59                                 eq->hi_shrd_mem_start + eq->hi_shrd_mem_size);
  60
  61                         memory_present(node,
  62                                 node_start_pfn[node], node_end_pfn[node]);
  63                         node_remap_size[node] = node_memmap_size_bytes(node,
  64                                                         node_start_pfn[node],
  65                                                         node_end_pfn[node]);
  66                 }
  67         }
  68 }
  69
  70 /*
  71  * Unlike Summit, we don't really care to let the NUMA-Q
  72  * fall back to flat mode.  Don't compile for NUMA-Q
  73  * unless you really need it!
  74  */
  75 int __init get_memcfg_numaq(void)
  76 {
  77         smp_dump_qct();
  78         return 1;
  79 }