You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: lib.rs
    path of file: ./repos/tock/chips/apollo3/src
    
    the code of the file until where you have to start completion: // Licensed under the Apache License, Version 2.0 or the MIT License.
// SPDX-License-Identifier: Apache-2.0 OR MIT
// Copyright Tock Contributors 2022.

//! Peripheral implementations for the Apollo3 MCU.

#![crate_name = "apollo3"]
#![crate_type = "rlib"]
#![no_std]

// Peripherals
pub mod ble;
pub mod cachectrl;
pub mod chip;
pub mod clkgen;
pub mod gpio;
pub mod iom;
pub mod ios;
pub mod mcuctrl;
pub mod nvic;
pub mod pwrctrl;
pub mod stimer;
pub mod uart;

use cortexm4::{initialize_ram_jump_to_main, scb, unhandled_interrupt, CortexM4, CortexMVariant};

extern "C" {
    // _estack is not really a function, but it makes the types work
    // You should never actually invoke it!!
    fn _estack();
}

#[cfg_attr(
    all(target_arch = "arm", target_os = "none"),
    link_section = ".vectors"
)]
// used Ensures that the symbol is kept until the final binary
#[cfg_attr(all(target_arch = "arm", targ
    
pub unsafe fn init() {
    use core::arch::asm;
    let cache_ctrl = crate::cachectrl::CacheCtrl::new();
    cache_ctrl.enable_cache();

    // Explicitly tell the core where Tock's vector table is located. If Tock is the
    // only thing on the chip then this is effectively a no-op. If, however, there is
    // a bootloader present then we want to ensure that the vector table is set
    // correctly for Tock. The bootloader _may_ set this for us, but it may not
    // so that any errors early in the Tock boot process trap back to the bootloader.
    // To be safe we unconditionally set the vector table.
    scb::set_vector_table_offset(BASE_VECTORS.as_ptr() as *const ());

    // Disable the FPU (it might be enalbed by a prior stage)
    scb::disable_fpca();

    // This ensures the FPU is actually disabled
    asm!("svc 0xff", out("r0") _, out("r1") _, out("r2") _, out("r3") _, out("r12") _);

    cortexm4::nvic::disable_all();
    cortexm4::nvic::clear_all_pending();
    cortexm4::nvic::enable_all();
}