Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

 * 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);

}