/*
   * arch/sh/mm/numa.c - Multiple node support for SH machines
   *
   *  Copyright (C) 2007  Paul Mundt
   *
   * This file is subject to the terms and conditions of the GNU General Public
   * License.  See the file "COPYING" in the main directory of this archive
   * for more details.
   */
  #include <linux/module.h>
  #include <linux/bootmem.h>
  #include <linux/memblock.h>
  #include <linux/mm.h>
  #include <linux/numa.h>
  #include <linux/pfn.h>
  #include <asm/sections.h>
  
  struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
  EXPORT_SYMBOL_GPL(node_data);
  
  /*
   * On SH machines the conventional approach is to stash system RAM
   * in node 0, and other memory blocks in to node 1 and up, ordered by
   * latency. Each node's pgdat is node-local at the beginning of the node,
   * immediately followed by the node mem map.
   */
  void __init setup_bootmem_node(int nid, unsigned long start, unsigned long end)
  {
  	unsigned long bootmap_pages;
  	unsigned long start_pfn, end_pfn;
  	unsigned long bootmem_paddr;
  
  	/* Don't allow bogus node assignment */
  	BUG_ON(nid > MAX_NUMNODES || nid <= 0);
  
  	start_pfn = start >> PAGE_SHIFT;
  	end_pfn = end >> PAGE_SHIFT;
  
  	pmb_bolt_mapping((unsigned long)__va(start), start, end - start,
  			 PAGE_KERNEL);
  
  	memblock_add(start, end - start);
  
  	__add_active_range(nid, start_pfn, end_pfn);
  
  	/* Node-local pgdat */
  	NODE_DATA(nid) = __va(memblock_alloc_base(sizeof(struct pglist_data),
  					     SMP_CACHE_BYTES, end));
  	memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
  
  	NODE_DATA(nid)->bdata = &bootmem_node_data[nid];
  	NODE_DATA(nid)->node_start_pfn = start_pfn;
  	NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
  
  	/* Node-local bootmap */
  	bootmap_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
  	bootmem_paddr = memblock_alloc_base(bootmap_pages << PAGE_SHIFT,
  				       PAGE_SIZE, end);
  	init_bootmem_node(NODE_DATA(nid), bootmem_paddr >> PAGE_SHIFT,
  			  start_pfn, end_pfn);
  
  	free_bootmem_with_active_regions(nid, end_pfn);
  
  	/* Reserve the pgdat and bootmap space with the bootmem allocator */
  	reserve_bootmem_node(NODE_DATA(nid), start_pfn << PAGE_SHIFT,
  			     sizeof(struct pglist_data), BOOTMEM_DEFAULT);
  	reserve_bootmem_node(NODE_DATA(nid), bootmem_paddr,
  			     bootmap_pages << PAGE_SHIFT, BOOTMEM_DEFAULT);
  
  	/* It's up */
  	node_set_online(nid);
  
  	/* Kick sparsemem */
  	sparse_memory_present_with_active_regions(nid);
  }