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 #include <asm/processor.h>
  35
  36 #define MB_TO_PAGES(addr) ((addr) << (20 - PAGE_SHIFT))
  37
  38 /*
  39  * Function: smp_dump_qct()
  40  *
  41  * Description: gets memory layout from the quad config table.  This
  42  * function also updates node_online_map with the nodes (quads) present.
  43  */
  44 static void __init smp_dump_qct(void)
  45 {
  46         int node;
  47         struct eachquadmem *eq;
  48         struct sys_cfg_data *scd =
  49                 (struct sys_cfg_data *)__va(SYS_CFG_DATA_PRIV_ADDR);
  50
  51         nodes_clear(node_online_map);
  52         for_each_node(node) {
  53                 if (scd->quads_present31_0 & (1 << node)) {
  54                         node_set_online(node);
  55                         eq = &scd->eq[node];
  56                         /* Convert to pages */
  57                         node_start_pfn[node] = MB_TO_PAGES(
  58                                 eq->hi_shrd_mem_start - eq->priv_mem_size);
  59                         node_end_pfn[node] = MB_TO_PAGES(
  60                                 eq->hi_shrd_mem_start + eq->hi_shrd_mem_size);
  61
  62                         memory_present(node,
  63                                 node_start_pfn[node], node_end_pfn[node]);
  64                         node_remap_size[node] = node_memmap_size_bytes(node,
  65                                                         node_start_pfn[node],
  66                                                         node_end_pfn[node]);
  67                 }
  68         }
  69 }
  70
  71 /*
  72  * Unlike Summit, we don't really care to let the NUMA-Q
  73  * fall back to flat mode.  Don't compile for NUMA-Q
  74  * unless you really need it!
  75  */
  76 int __init get_memcfg_numaq(void)
  77 {
  78         smp_dump_qct();
  79         return 1;
  80 }
  81
  82 static int __init numaq_dsc_disable(void)
  83 {
  84         printk(KERN_DEBUG "NUMAQ: disabling TSC\n");
  85         tsc_disable = 1;
  86         return 0;
  87 }
  88 core_initcall(numaq_dsc_disable);