sh: Support for multiple nodes.
This adds basic support for multiple nodes on SH machines.
This is primarily useful for boards with many different
memory blocks that are otherwise unused (SH7722/SH7785 URAM
and so forth).
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/mm/numa.c b/arch/sh/mm/numa.c
new file mode 100644
index 0000000..8aff065
--- /dev/null
+++ b/arch/sh/mm/numa.c
@@ -0,0 +1,92 @@
+/*
+ * 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/mm.h>
+#include <linux/numa.h>
+#include <linux/pfn.h>
+#include <asm/sections.h>
+
+static bootmem_data_t plat_node_bdata[MAX_NUMNODES];
+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_memory(void)
+{
+ unsigned long free_pfn = PFN_UP(__pa(_end));
+
+ /*
+ * Node 0 sets up its pgdat at the first available pfn,
+ * and bumps it up before setting up the bootmem allocator.
+ */
+ NODE_DATA(0) = pfn_to_kaddr(free_pfn);
+ memset(NODE_DATA(0), 0, sizeof(struct pglist_data));
+ free_pfn += PFN_UP(sizeof(struct pglist_data));
+ NODE_DATA(0)->bdata = &plat_node_bdata[0];
+
+ /* Set up node 0 */
+ setup_bootmem_allocator(free_pfn);
+
+ /* Give the platforms a chance to hook up their nodes */
+ plat_mem_setup();
+}
+
+void __init setup_bootmem_node(int nid, unsigned long start, unsigned long end)
+{
+ unsigned long bootmap_pages, bootmap_start, bootmap_size;
+ unsigned long start_pfn, free_pfn, end_pfn;
+
+ /* Don't allow bogus node assignment */
+ BUG_ON(nid > MAX_NUMNODES || nid == 0);
+
+ /*
+ * The free pfn starts at the beginning of the range, and is
+ * advanced as necessary for pgdat and node map allocations.
+ */
+ free_pfn = start_pfn = start >> PAGE_SHIFT;
+ end_pfn = end >> PAGE_SHIFT;
+
+ add_active_range(nid, start_pfn, end_pfn);
+
+ /* Node-local pgdat */
+ NODE_DATA(nid) = pfn_to_kaddr(free_pfn);
+ free_pfn += PFN_UP(sizeof(struct pglist_data));
+ memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
+
+ NODE_DATA(nid)->bdata = &plat_node_bdata[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);
+ bootmap_start = (unsigned long)pfn_to_kaddr(free_pfn);
+ bootmap_size = init_bootmem_node(NODE_DATA(nid), free_pfn, 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));
+ reserve_bootmem_node(NODE_DATA(nid), free_pfn << PAGE_SHIFT,
+ bootmap_pages << PAGE_SHIFT);
+
+ /* It's up */
+ node_set_online(nid);
+
+ /* Kick sparsemem */
+ sparse_memory_present_with_active_regions(nid);
+}