linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 * Functions for working with the Flattened Device Tree data format

 *

 * Copyright 2009 Benjamin Herrenschmidt, IBM Corp

 * benh@kernel.crashing.org

 */

​

#define pr_fmt(fmt) "OF: fdt: " fmt

​

#include <linux/crc32.h>

#include <linux/kernel.h>

#include <linux/initrd.h>

#include <linux/memblock.h>

#include <linux/mutex.h>

#include <linux/of.h>

#include <linux/of_fdt.h>

#include <linux/of_reserved_mem.h>

#include <linux/sizes.h>

#include <linux/string.h>

#include <linux/errno.h>

#include <linux/slab.h>

#include <linux/libfdt.h>

#include <linux/debugfs.h>

#include <linux/serial_core.h>

#include <linux/sysfs.h>

​

#include <asm/setup.h>  /* for COMMAND_LINE_SIZE */

#include <asm/page.h>

​

#include "of_private.h"

​

/*

 * of_fdt_limit_memory - limit the number of regions in the /memory node

 * @limit: maximum entries

 *

 * Adjust the flattened device tree to have at most 'limit' number of

 * memory entries in the /memory node. This function may be called

 * any time after initial_boot_param is set.

 */

void of_fdt_limit_memory(int limit)

{

    int memory;

    int len;

    const void *val;

    int nr_address_cells = OF_ROOT_NODE_ADDR_CELLS_DEFAULT;

    int nr_size_cells = OF_ROOT_NODE_SIZE_CELLS_DEFAULT;

    const __be32 *addr_prop;

    const __be32 *size_prop;

    int root_offset;

    int cell_size;

​

    root_offset = fdt_path_offset(initial_boot_params, "/");

    if (root_offset < 0)

        return;

​

    addr_prop = fdt_getprop(initial_boot_params, root_offset,

                "#address-cells", NULL);

    if (addr_prop)

        nr_address_cells = fdt32_to_cpu(*addr_prop);

​

    size_prop = fdt_getprop(initial_boot_params, root_offset,

                "#size-cells", NULL);