Archipelago » qemu

/*

 * 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 "device_tree.h"

#include "hw/loader.h"

#include "qemu-option.h"

#include "qemu-config.h"

#include <libfdt.h>

#define FDT_MAX_SIZE  0x10000

void *create_device_tree(int *sizep)

{

    void *fdt;

    int ret;

    *sizep = FDT_MAX_SIZE;

    fdt = g_malloc0(FDT_MAX_SIZE);

    ret = fdt_create(fdt, FDT_MAX_SIZE);

    if (ret < 0) {

        goto fail;

    }

    ret = fdt_begin_node(fdt, "");

    if (ret < 0) {

        goto fail;

    }

    ret = fdt_end_node(fdt);

    if (ret < 0) {

        goto fail;

    }

    ret = fdt_finish(fdt);

    if (ret < 0) {

        goto fail;

    }

    ret = fdt_open_into(fdt, fdt, *sizep);

    if (ret) {

        fprintf(stderr, "Unable to copy device tree in memory\n");

        exit(1);

    }

    return fdt;

fail:

    fprintf(stderr, "%s Couldn't create dt: %s\n", __func__, fdt_strerror(ret));

    exit(1);

}

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 += 10000;

    dt_size *= 2;

    /* First allocate space in qemu for device tree */

    fdt = g_malloc0(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:

    g_free(fdt);

    return NULL;

}

static int findnode_nofail(void *fdt, const char *node_path)

{

    int offset;

    offset = fdt_path_offset(fdt, node_path);

    if (offset < 0) {

        fprintf(stderr, "%s Couldn't find node %s: %s\n", __func__, node_path,

                fdt_strerror(offset));

        exit(1);

    }

    return offset;

}

int qemu_devtree_setprop(void *fdt, const char *node_path,

                         const char *property, void *val_array, int size)

{

    int r;

    r = fdt_setprop(fdt, findnode_nofail(fdt, node_path), property, val_array, size);

    if (r < 0) {

        fprintf(stderr, "%s: Couldn't set %s/%s: %s\n", __func__, node_path,

                property, fdt_strerror(r));

        exit(1);

    }

    return r;

}

int qemu_devtree_setprop_cell(void *fdt, const char *node_path,

                              const char *property, uint32_t val)

{

    int r;

    r = fdt_setprop_cell(fdt, findnode_nofail(fdt, node_path), property, val);

    if (r < 0) {

        fprintf(stderr, "%s: Couldn't set %s/%s = %#08x: %s\n", __func__,

                node_path, property, val, fdt_strerror(r));

        exit(1);

    }

    return r;

}

int qemu_devtree_setprop_u64(void *fdt, const char *node_path,

                             const char *property, uint64_t val)

{

    val = cpu_to_be64(val);

    return qemu_devtree_setprop(fdt, node_path, property, &val, sizeof(val));

}

int qemu_devtree_setprop_string(void *fdt, const char *node_path,

                                const char *property, const char *string)

{

    int r;

    r = fdt_setprop_string(fdt, findnode_nofail(fdt, node_path), property, string);

    if (r < 0) {

        fprintf(stderr, "%s: Couldn't set %s/%s = %s: %s\n", __func__,

                node_path, property, string, fdt_strerror(r));

        exit(1);

    }

    return r;

}

uint32_t qemu_devtree_get_phandle(void *fdt, const char *path)

{

    uint32_t r;

    r = fdt_get_phandle(fdt, findnode_nofail(fdt, path));

    if (r <= 0) {

        fprintf(stderr, "%s: Couldn't get phandle for %s: %s\n", __func__,

                path, fdt_strerror(r));

        exit(1);

    }

    return r;

}

int qemu_devtree_setprop_phandle(void *fdt, const char *node_path,

                                 const char *property,

                                 const char *target_node_path)

{

    uint32_t phandle = qemu_devtree_get_phandle(fdt, target_node_path);

    return qemu_devtree_setprop_cell(fdt, node_path, property, phandle);

}

uint32_t qemu_devtree_alloc_phandle(void *fdt)

{

    static int phandle = 0x0;

    /*

     * We need to find out if the user gave us special instruction at

     * which phandle id to start allocting phandles.

     */

    if (!phandle) {

        QemuOpts *machine_opts;

        machine_opts = qemu_opts_find(qemu_find_opts("machine"), 0);

        if (machine_opts) {

            const char *phandle_start;

            phandle_start = qemu_opt_get(machine_opts, "phandle_start");

            if (phandle_start) {

                phandle = strtoul(phandle_start, NULL, 0);

            }

        }

    }

    if (!phandle) {

        /*

         * None or invalid phandle given on the command line, so fall back to

         * default starting point.

         */

        phandle = 0x8000;

    }

    return phandle++;

}

int qemu_devtree_nop_node(void *fdt, const char *node_path)

{

    int r;

    r = fdt_nop_node(fdt, findnode_nofail(fdt, node_path));

    if (r < 0) {

        fprintf(stderr, "%s: Couldn't nop node %s: %s\n", __func__, node_path,

                fdt_strerror(r));

        exit(1);

    }

    return r;

}

int qemu_devtree_add_subnode(void *fdt, const char *name)

{

    char *dupname = g_strdup(name);

    char *basename = strrchr(dupname, '/');

    int retval;

    int parent = 0;

    if (!basename) {

        g_free(dupname);

        return -1;

    }

    basename[0] = '\0';

    basename++;

    if (dupname[0]) {

        parent = findnode_nofail(fdt, dupname);

    }

    retval = fdt_add_subnode(fdt, parent, basename);

    if (retval < 0) {

        fprintf(stderr, "FDT: Failed to create subnode %s: %s\n", name,

                fdt_strerror(retval));

        exit(1);

    }

    g_free(dupname);

    return retval;

}