1/*
2 *  Multiple memory node support for Meta machines
3 *
4 *  Copyright (C) 2007  Paul Mundt
5 *  Copyright (C) 2010  Imagination Technologies Ltd.
6 *
7 * This file is subject to the terms and conditions of the GNU General Public
8 * License.  See the file "COPYING" in the main directory of this archive
9 * for more details.
10 */
11#include <linux/export.h>
12#include <linux/bootmem.h>
13#include <linux/memblock.h>
14#include <linux/mm.h>
15#include <linux/numa.h>
16#include <linux/pfn.h>
17#include <asm/sections.h>
18
19struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
20EXPORT_SYMBOL_GPL(node_data);
21
22extern char _heap_start[];
23
24/*
25 * On Meta machines the conventional approach is to stash system RAM
26 * in node 0, and other memory blocks in to node 1 and up, ordered by
27 * latency. Each node's pgdat is node-local at the beginning of the node,
28 * immediately followed by the node mem map.
29 */
30void __init setup_bootmem_node(int nid, unsigned long start, unsigned long end)
31{
32	unsigned long bootmap_pages, bootmem_paddr;
33	unsigned long start_pfn, end_pfn;
34	unsigned long pgdat_paddr;
35
36	/* Don't allow bogus node assignment */
37	BUG_ON(nid >= MAX_NUMNODES || nid <= 0);
38
39	start_pfn = start >> PAGE_SHIFT;
40	end_pfn = end >> PAGE_SHIFT;
41
42	memblock_add(start, end - start);
43
44	memblock_set_node(PFN_PHYS(start_pfn),
45			  PFN_PHYS(end_pfn - start_pfn),
46			  &memblock.memory, nid);
47
48	/* Node-local pgdat */
49	pgdat_paddr = memblock_alloc_base(sizeof(struct pglist_data),
50					  SMP_CACHE_BYTES, end);
51	NODE_DATA(nid) = __va(pgdat_paddr);
52	memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
53
54	NODE_DATA(nid)->bdata = &bootmem_node_data[nid];
55	NODE_DATA(nid)->node_start_pfn = start_pfn;
56	NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
57
58	/* Node-local bootmap */
59	bootmap_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
60	bootmem_paddr = memblock_alloc_base(bootmap_pages << PAGE_SHIFT,
61					    PAGE_SIZE, end);
62	init_bootmem_node(NODE_DATA(nid), bootmem_paddr >> PAGE_SHIFT,
63			  start_pfn, end_pfn);
64
65	free_bootmem_with_active_regions(nid, end_pfn);
66
67	/* Reserve the pgdat and bootmap space with the bootmem allocator */
68	reserve_bootmem_node(NODE_DATA(nid), pgdat_paddr & PAGE_MASK,
69			     sizeof(struct pglist_data), BOOTMEM_DEFAULT);
70	reserve_bootmem_node(NODE_DATA(nid), bootmem_paddr,
71			     bootmap_pages << PAGE_SHIFT, BOOTMEM_DEFAULT);
72
73	/* It's up */
74	node_set_online(nid);
75
76	/* Kick sparsemem */
77	sparse_memory_present_with_active_regions(nid);
78}
79
80void __init __weak soc_mem_setup(void)
81{
82}
83