numa.c 1.6 KB

1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556
  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. struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
  17. EXPORT_SYMBOL_GPL(node_data);
  18. /*
  19. * On SH machines the conventional approach is to stash system RAM
  20. * in node 0, and other memory blocks in to node 1 and up, ordered by
  21. * latency. Each node's pgdat is node-local at the beginning of the node,
  22. * immediately followed by the node mem map.
  23. */
  24. void __init setup_bootmem_node(int nid, unsigned long start, unsigned long end)
  25. {
  26. unsigned long start_pfn, end_pfn;
  27. /* Don't allow bogus node assignment */
  28. BUG_ON(nid >= MAX_NUMNODES || nid <= 0);
  29. start_pfn = PFN_DOWN(start);
  30. end_pfn = PFN_DOWN(end);
  31. pmb_bolt_mapping((unsigned long)__va(start), start, end - start,
  32. PAGE_KERNEL);
  33. memblock_add(start, end - start);
  34. __add_active_range(nid, start_pfn, end_pfn);
  35. /* Node-local pgdat */
  36. NODE_DATA(nid) = memblock_alloc_node(sizeof(struct pglist_data),
  37. SMP_CACHE_BYTES, nid);
  38. if (!NODE_DATA(nid))
  39. panic("%s: Failed to allocate %zu bytes align=0x%x nid=%d\n",
  40. __func__, sizeof(struct pglist_data), SMP_CACHE_BYTES,
  41. nid);
  42. NODE_DATA(nid)->node_start_pfn = start_pfn;
  43. NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
  44. /* It's up */
  45. node_set_online(nid);
  46. }