linux-imx

/*

 * linux/drivers/firmware/memmap.c

 *  Copyright (C) 2008 SUSE LINUX Products GmbH

 *  by Bernhard Walle <bernhard.walle@gmx.de>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License v2.0 as published by

 * the Free Software Foundation

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 */

​

#include <linux/string.h>

#include <linux/firmware-map.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/types.h>

#include <linux/memblock.h>

#include <linux/slab.h>

#include <linux/mm.h>

​

/*

 * Data types ------------------------------------------------------------------

 */

​

/*

 * Firmware map entry. Because firmware memory maps are flat and not

 * hierarchical, it's ok to organise them in a linked list. No parent

 * information is necessary as for the resource tree.

 */

struct firmware_map_entry {

    /*

     * start and end must be u64 rather than resource_size_t, because e820

     * resources can lie at addresses above 4G.

     */

    u64         start;  /* start of the memory range */

    u64         end;    /* end of the memory range (incl.) */

    const char      *type;  /* type of the memory range */

    struct list_head    list;   /* entry for the linked list */

    struct kobject      kobj;   /* kobject for each entry */

};

​

/*

 * Forward declarations --------------------------------------------------------

 */

static ssize_t memmap_attr_show(struct kobject *kobj,

                struct attribute *attr, char *buf);

static ssize_t start_show(struct firmware_map_entry *entry, char *buf);

static ssize_t end_show(struct firmware_map_entry *entry, char *buf);

static ssize_t type_show(struct firmware_map_entry *entry, char *buf);

​

static struct firmware_map_entry * __meminit

firmware_map_find_entry(u64 start, u64 end, const char *type);

​

/*

 * Static data -----------------------------------------------------------------

 */

​

struct memmap_attribute {

    struct attribute attr;

    ssize_t (*show)(struct firmware_map_entry *entry, char *buf);

};

​

static struct memmap_attribute memmap_start_attr = __ATTR_RO(start);

static struct memmap_attribute memmap_end_attr   = __ATTR_RO(end);

static struct memmap_attribute memmap_type_attr  = __ATTR_RO(type);

​

/*

 * These are default attributes that are added for every memmap entry.

 */

static struct attribute *def_attrs[] = {

    &memmap_start_attr.attr,

    &memmap_end_attr.attr,

    &memmap_type_attr.attr,

    NULL

};

​

static const struct sysfs_ops memmap_attr_ops = {

    .show = memmap_attr_show,

};

​

/* Firmware memory map entries. */

static LIST_HEAD(map_entries);

static DEFINE_SPINLOCK(map_entries_lock);

​

/*

 * For memory hotplug, there is no way to free memory map entries allocated

 * by boot mem after the system is up. So when we hot-remove memory whose