LXR linux/arch/sh/mm/numa.c

   1/*
   2 * arch/sh/mm/numa.c - Multiple node support for SH machines
   3 *
   4 *  Copyright (C) 2007  Paul Mundt
   5 *
   6 * This file is subject to the terms and conditions of the GNU General Public
   7 * License.  See the file "COPYING" in the main directory of this archive
   8 * for more details.
   9 */
  10#include <linux/module.h>
  11#include <linux/memblock.h>
  12#include <linux/mm.h>
  13#include <linux/numa.h>
  14#include <linux/pfn.h>
  15#include <asm/sections.h>
  16
  17struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
  18EXPORT_SYMBOL_GPL(node_data);
  19
  20/*
  21 * On SH machines the conventional approach is to stash system RAM
  22 * in node 0, and other memory blocks in to node 1 and up, ordered by
  23 * latency. Each node's pgdat is node-local at the beginning of the node,
  24 * immediately followed by the node mem map.
  25 */
  26void __init setup_bootmem_node(int nid, unsigned long start, unsigned long end)
  27{
  28        unsigned long start_pfn, end_pfn;
  29
  30        /* Don't allow bogus node assignment */
  31        BUG_ON(nid >= MAX_NUMNODES || nid <= 0);
  32
  33        start_pfn = PFN_DOWN(start);
  34        end_pfn = PFN_DOWN(end);
  35
  36        pmb_bolt_mapping((unsigned long)__va(start), start, end - start,
  37                         PAGE_KERNEL);
  38
  39        memblock_add(start, end - start);
  40
  41        __add_active_range(nid, start_pfn, end_pfn);
  42
  43        /* Node-local pgdat */
  44        NODE_DATA(nid) = memblock_alloc_node(sizeof(struct pglist_data),
  45                                             SMP_CACHE_BYTES, nid);
  46        if (!NODE_DATA(nid))
  47                panic("%s: Failed to allocate %zu bytes align=0x%x nid=%d\n",
  48                      __func__, sizeof(struct pglist_data), SMP_CACHE_BYTES,
  49                      nid);
  50
  51        NODE_DATA(nid)->node_start_pfn = start_pfn;
  52        NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
  53
  54        /* It's up */
  55        node_set_online(nid);
  56}
  57