struct boot_info *dt_from_fs(const char *dirname)
{
struct node *tree;
tree = read_fstree(dirname);
tree = name_node(tree, "");
return build_boot_info(NULL, tree, guess_boot_cpuid(tree));
}
static struct node *read_fstree(const char *dirname)
{
DIR *d;
struct dirent *de;
struct stat st;
struct node *tree;
d = opendir(dirname);
if (!d)
die("Couldn't opendir() \"%s\": %s\n", dirname, strerror(errno));
tree = build_node(NULL, NULL);
while ((de = readdir(d)) != NULL) {
char *tmpnam;
if (streq(de->d_name, ".")
|| streq(de->d_name, ".."))
continue;
tmpnam = join_path(dirname, de->d_name);
if (lstat(tmpnam, &st) < 0)
die("stat(%s): %s\n", tmpnam, strerror(errno));
if (S_ISREG(st.st_mode)) {
struct property *prop;
FILE *pfile;
pfile = fopen(tmpnam, "r");
if (! pfile) {
fprintf(stderr,
"WARNING: Cannot open %s: %s\n",
tmpnam, strerror(errno));
} else {
prop = build_property(xstrdup(de->d_name),
data_copy_file(pfile,
st.st_size));
add_property(tree, prop);
fclose(pfile);
}
} else if (S_ISDIR(st.st_mode)) {
struct node *newchild;
newchild = read_fstree(tmpnam);
newchild = name_node(newchild, xstrdup(de->d_name));
add_child(tree, newchild);
}
free(tmpnam);
}
closedir(d);
return tree;
}
/* load_device_tree_from_sysfs: extract the dt blob from host sysfs */
void *load_device_tree_from_sysfs(void)
{
void *host_fdt;
int host_fdt_size;
host_fdt = create_device_tree(&host_fdt_size);
read_fstree(host_fdt, SYSFS_DT_BASEDIR);
if (fdt_check_header(host_fdt)) {
error_setg(&error_fatal,
"%s host device tree extracted into memory is invalid",
__func__);
}
return host_fdt;
}
/**
* read_fstree: this function is inspired from dtc read_fstree
* @fdt: preallocated fdt blob buffer, to be populated
* @dirname: directory to scan under SYSFS_DT_BASEDIR
* the search is recursive and the tree is searched down to the
* leaves (property files).
*
* the function asserts in case of error
*/
static void read_fstree(void *fdt, const char *dirname)
{
DIR *d;
struct dirent *de;
struct stat st;
const char *root_dir = SYSFS_DT_BASEDIR;
const char *parent_node;
if (strstr(dirname, root_dir) != dirname) {
error_setg(&error_fatal, "%s: %s must be searched within %s",
__func__, dirname, root_dir);
}
parent_node = &dirname[strlen(SYSFS_DT_BASEDIR)];
d = opendir(dirname);
if (!d) {
error_setg(&error_fatal, "%s cannot open %s", __func__, dirname);
}
while ((de = readdir(d)) != NULL) {
char *tmpnam;
if (!g_strcmp0(de->d_name, ".")
|| !g_strcmp0(de->d_name, "..")) {
continue;
}
tmpnam = g_strdup_printf("%s/%s", dirname, de->d_name);
if (lstat(tmpnam, &st) < 0) {
error_setg(&error_fatal, "%s cannot lstat %s", __func__, tmpnam);
}
if (S_ISREG(st.st_mode)) {
gchar *val;
gsize len;
if (!g_file_get_contents(tmpnam, &val, &len, NULL)) {
error_setg(&error_fatal, "%s not able to extract info from %s",
__func__, tmpnam);
}
if (strlen(parent_node) > 0) {
qemu_fdt_setprop(fdt, parent_node,
de->d_name, val, len);
} else {
qemu_fdt_setprop(fdt, "/", de->d_name, val, len);
}
g_free(val);
} else if (S_ISDIR(st.st_mode)) {
char *node_name;
node_name = g_strdup_printf("%s/%s",
parent_node, de->d_name);
qemu_fdt_add_subnode(fdt, node_name);
g_free(node_name);
read_fstree(fdt, tmpnam);
}
g_free(tmpnam);
}
closedir(d);
}
