Skip to content
This repository

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
Fetching contributors…

Cannot retrieve contributors at this time

file 110 lines (91 sloc) 2.692 kb
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110
/*
* Functions to help device tree manipulation using libfdt.
* It also provides functions to read entries from device tree proc
* interface.
*
* Copyright 2008 IBM Corporation.
* Authors: Jerone Young <jyoung5@us.ibm.com>
* Hollis Blanchard <hollisb@us.ibm.com>
*
* This work is licensed under the GNU GPL license version 2 or later.
*
*/

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>

#include "config.h"
#include "qemu-common.h"
#include "sysemu.h"
#include "device_tree.h"
#include "hw/loader.h"

#include <libfdt.h>

void *load_device_tree(const char *filename_path, int *sizep)
{
    int dt_size;
    int dt_file_load_size;
    int ret;
    void *fdt = NULL;

    *sizep = 0;
    dt_size = get_image_size(filename_path);
    if (dt_size < 0) {
        printf("Unable to get size of device tree file '%s'\n",
            filename_path);
        goto fail;
    }

    /* Expand to 2x size to give enough room for manipulation. */
    dt_size *= 2;
    /* First allocate space in qemu for device tree */
    fdt = qemu_mallocz(dt_size);

    dt_file_load_size = load_image(filename_path, fdt);
    if (dt_file_load_size < 0) {
        printf("Unable to open device tree file '%s'\n",
               filename_path);
        goto fail;
    }

    ret = fdt_open_into(fdt, fdt, dt_size);
    if (ret) {
        printf("Unable to copy device tree in memory\n");
        goto fail;
    }

    /* Check sanity of device tree */
    if (fdt_check_header(fdt)) {
        printf ("Device tree file loaded into memory is invalid: %s\n",
            filename_path);
        goto fail;
    }
    *sizep = dt_size;
    return fdt;

fail:
    qemu_free(fdt);
    return NULL;
}

int qemu_devtree_setprop(void *fdt, const char *node_path,
                         const char *property, uint32_t *val_array, int size)
{
    int offset;

    offset = fdt_path_offset(fdt, node_path);
    if (offset < 0)
        return offset;

    return fdt_setprop(fdt, offset, property, val_array, size);
}

int qemu_devtree_setprop_cell(void *fdt, const char *node_path,
                              const char *property, uint32_t val)
{
    int offset;

    offset = fdt_path_offset(fdt, node_path);
    if (offset < 0)
        return offset;

    return fdt_setprop_cell(fdt, offset, property, val);
}

int qemu_devtree_setprop_string(void *fdt, const char *node_path,
                                const char *property, const char *string)
{
    int offset;

    offset = fdt_path_offset(fdt, node_path);
    if (offset < 0)
        return offset;

    return fdt_setprop_string(fdt, offset, property, string);
}
Something went wrong with that request. Please try again.