LXR linux/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/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
  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 */
  43static 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 */
  75int __init get_memcfg_numaq(void)
  76{
  77        smp_dump_qct();
  78        return 1;
  79}
  80
  81static int __init numaq_tsc_disable(void)
  82{
  83        if (num_online_nodes() > 1) {
  84                printk(KERN_DEBUG "NUMAQ: disabling TSC\n");
  85                tsc_disable = 1;
  86        }
  87        return 0;
  88}
  89arch_initcall(numaq_tsc_disable);
  90