arch/x86/kernel/numaq_32.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/mm.h>
  27 #include <linux/bootmem.h>
  28 #include <linux/mmzone.h>
  29 #include <linux/module.h>
  30 #include <linux/nodemask.h>
  31 #include <asm/numaq.h>
  32 #include <asm/topology.h>
  33 #include <asm/processor.h>
  34 #include <asm/mpspec.h>
  35 #include <asm/e820.h>
  36
  37 #define MB_TO_PAGES(addr) ((addr) << (20 - PAGE_SHIFT))
  38
  39 int found_numaq;
  40
  41 /*
  42  * Function: smp_dump_qct()
  43  *
  44  * Description: gets memory layout from the quad config table.  This
  45  * function also updates node_online_map with the nodes (quads) present.
  46  */
  47 static void __init smp_dump_qct(void)
  48 {
  49         int node;
  50         struct eachquadmem *eq;
  51         struct sys_cfg_data *scd =
  52                 (struct sys_cfg_data *)__va(SYS_CFG_DATA_PRIV_ADDR);
  53
  54         nodes_clear(node_online_map);
  55         for_each_node(node) {
  56                 if (scd->quads_present31_0 & (1 << node)) {
  57                         node_set_online(node);
  58                         eq = &scd->eq[node];
  59                         /* Convert to pages */
  60                         node_start_pfn[node] = MB_TO_PAGES(
  61                                 eq->hi_shrd_mem_start - eq->priv_mem_size);
  62                         node_end_pfn[node] = MB_TO_PAGES(
  63                                 eq->hi_shrd_mem_start + eq->hi_shrd_mem_size);
  64
  65                         e820_register_active_regions(node, node_start_pfn[node],
  66                                                         node_end_pfn[node]);
  67                         memory_present(node,
  68                                 node_start_pfn[node], node_end_pfn[node]);
  69                         node_remap_size[node] = node_memmap_size_bytes(node,
  70                                                         node_start_pfn[node],
  71                                                         node_end_pfn[node]);
  72                 }
  73         }
  74 }
  75
  76 static __init void early_check_numaq(void)
  77 {
  78         /*
  79          * Find possible boot-time SMP configuration:
  80          */
  81         early_find_smp_config();
  82         /*
  83          * get boot-time SMP configuration:
  84          */
  85         if (smp_found_config)
  86                 early_get_smp_config();
  87 }
  88
  89 int __init get_memcfg_numaq(void)
  90 {
  91         early_check_numaq();
  92         if (!found_numaq)
  93                 return 0;
  94         smp_dump_qct();
  95         return 1;
  96 }
  97
  98 static int __init numaq_tsc_disable(void)
  99 {
 100         if (num_online_nodes() > 1) {
 101                 printk(KERN_DEBUG "NUMAQ: disabling TSC\n");
 102                 setup_clear_cpu_cap(X86_FEATURE_TSC);
 103         }
 104         return 0;
 105 }
 106 arch_initcall(numaq_tsc_disable);