static void __init copy_devtree(void) { void *alloc = early_init_dt_alloc_memory_arch( be32_to_cpu(initial_boot_params->totalsize), 0); if (alloc) { memcpy(alloc, initial_boot_params, be32_to_cpu(initial_boot_params->totalsize)); initial_boot_params = alloc; } }
/** * unflatten_and_copy_device_tree - copy and create tree of device_nodes from flat blob * * Copies and unflattens the device-tree passed by the firmware, creating the * tree of struct device_node. It also fills the "name" and "type" * pointers of the nodes so the normal device-tree walking functions * can be used. This should only be used when the FDT memory has not been * reserved such is the case when the FDT is built-in to the kernel init * section. If the FDT memory is reserved already then unflatten_device_tree * should be used instead. */ void __init unflatten_and_copy_device_tree(void) { int size; void *dt; if (!initial_boot_params) { pr_warn("No valid device tree found, continuing without\n"); return; } size = fdt_totalsize(initial_boot_params); dt = early_init_dt_alloc_memory_arch(size, roundup_pow_of_two(FDT_V17_SIZE)); if (dt) { memcpy(dt, initial_boot_params, size); initial_boot_params = dt; } unflatten_device_tree(); }