nrf52840dk_test_appid_ecdsap256/

main.rs

// Licensed under the Apache License, Version 2.0 or the MIT License.
// SPDX-License-Identifier: Apache-2.0 OR MIT
// Copyright Tock Contributors 2022.

//! Tock kernel for the Nordic Semiconductor nRF52840 development kit (DK).

#![no_std]
#![no_main]
#![deny(missing_docs)]

use core::ptr::{addr_of, addr_of_mut};

use kernel::component::Component;
use kernel::deferred_call::DeferredCallClient;
use kernel::hil::led::LedLow;
use kernel::hil::time::Counter;
use kernel::platform::{KernelResources, SyscallDriverLookup};
use kernel::scheduler::round_robin::RoundRobinSched;
use kernel::{capabilities, create_capability, static_init};
use nrf52840::gpio::Pin;
use nrf52840::interrupt_service::Nrf52840DefaultPeripherals;
use nrf52_components::{UartChannel, UartPins};

// The nRF52840DK LEDs (see back of board)
const LED1_PIN: Pin = Pin::P0_13;
const LED2_PIN: Pin = Pin::P0_14;
const LED3_PIN: Pin = Pin::P0_15;
const LED4_PIN: Pin = Pin::P0_16;

const BUTTON_RST_PIN: Pin = Pin::P0_18;

const UART_RTS: Option<Pin> = Some(Pin::P0_05);
const UART_TXD: Pin = Pin::P0_06;
const UART_CTS: Option<Pin> = Some(Pin::P0_07);
const UART_RXD: Pin = Pin::P0_08;

/// Debug Writer
pub mod io;

// State for loading and holding applications.
// How should the kernel respond when a process faults.
const FAULT_RESPONSE: capsules_system::process_policies::PanicFaultPolicy =
    capsules_system::process_policies::PanicFaultPolicy {};

// Number of concurrent processes this platform supports.
const NUM_PROCS: usize = 8;

static mut PROCESSES: [Option<&'static dyn kernel::process::Process>; NUM_PROCS] =
    [None; NUM_PROCS];

static mut CHIP: Option<&'static nrf52840::chip::NRF52<Nrf52840DefaultPeripherals>> = None;

/// Dummy buffer that causes the linker to reserve enough space for the stack.
#[no_mangle]
#[link_section = ".stack_buffer"]
pub static mut STACK_MEMORY: [u8; 0x2000] = [0; 0x2000];

//------------------------------------------------------------------------------
// SYSCALL DRIVER TYPE DEFINITIONS
//------------------------------------------------------------------------------

type AlarmDriver = components::alarm::AlarmDriverComponentType<nrf52840::rtc::Rtc<'static>>;

/// Supported drivers by the platform
pub struct Platform {
    console: &'static capsules_core::console::Console<'static>,
    led: &'static capsules_core::led::LedDriver<
        'static,
        kernel::hil::led::LedLow<'static, nrf52840::gpio::GPIOPin<'static>>,
        4,
    >,
    alarm: &'static AlarmDriver,
    scheduler: &'static RoundRobinSched<'static>,
    systick: cortexm4::systick::SysTick,
}

impl SyscallDriverLookup for Platform {
    fn with_driver<F, R>(&self, driver_num: usize, f: F) -> R
    where
        F: FnOnce(Option<&dyn kernel::syscall::SyscallDriver>) -> R,
    {
        match driver_num {
            capsules_core::console::DRIVER_NUM => f(Some(self.console)),
            capsules_core::alarm::DRIVER_NUM => f(Some(self.alarm)),
            capsules_core::led::DRIVER_NUM => f(Some(self.led)),
            _ => f(None),
        }
    }
}

/// This is in a separate, inline(never) function so that its stack frame is
/// removed when this function returns. Otherwise, the stack space used for
/// these static_inits is wasted.
#[inline(never)]
unsafe fn create_peripherals() -> &'static mut Nrf52840DefaultPeripherals<'static> {
    let ieee802154_ack_buf = static_init!(
        [u8; nrf52840::ieee802154_radio::ACK_BUF_SIZE],
        [0; nrf52840::ieee802154_radio::ACK_BUF_SIZE]
    );
    // Initialize chip peripheral drivers
    let nrf52840_peripherals = static_init!(
        Nrf52840DefaultPeripherals,
        Nrf52840DefaultPeripherals::new(ieee802154_ack_buf)
    );

    nrf52840_peripherals
}

impl KernelResources<nrf52840::chip::NRF52<'static, Nrf52840DefaultPeripherals<'static>>>
    for Platform
{
    type SyscallDriverLookup = Self;
    type SyscallFilter = ();
    type ProcessFault = ();
    type Scheduler = RoundRobinSched<'static>;
    type SchedulerTimer = cortexm4::systick::SysTick;
    type WatchDog = ();
    type ContextSwitchCallback = ();

    fn syscall_driver_lookup(&self) -> &Self::SyscallDriverLookup {
        self
    }
    fn syscall_filter(&self) -> &Self::SyscallFilter {
        &()
    }
    fn process_fault(&self) -> &Self::ProcessFault {
        &()
    }
    fn scheduler(&self) -> &Self::Scheduler {
        self.scheduler
    }
    fn scheduler_timer(&self) -> &Self::SchedulerTimer {
        &self.systick
    }
    fn watchdog(&self) -> &Self::WatchDog {
        &()
    }
    fn context_switch_callback(&self) -> &Self::ContextSwitchCallback {
        &()
    }
}

/// Main function called after RAM initialized.
#[no_mangle]
pub unsafe fn main() {
    //--------------------------------------------------------------------------
    // INITIAL SETUP
    //--------------------------------------------------------------------------

    // Apply errata fixes and enable interrupts.
    nrf52840::init();

    // Set up peripheral drivers. Called in separate function to reduce stack
    // usage.
    let nrf52840_peripherals = create_peripherals();

    // Set up circular peripheral dependencies.
    nrf52840_peripherals.init();
    let base_peripherals = &nrf52840_peripherals.nrf52;

    // Choose the channel for serial output. This board can be configured to use
    // either the Segger RTT channel or via UART with traditional TX/RX GPIO
    // pins.
    let uart_channel = UartChannel::Pins(UartPins::new(UART_RTS, UART_TXD, UART_CTS, UART_RXD));

    // Setup space to store the core kernel data structure.
    let board_kernel = static_init!(kernel::Kernel, kernel::Kernel::new(&*addr_of!(PROCESSES)));

    // Create (and save for panic debugging) a chip object to setup low-level
    // resources (e.g. MPU, systick).
    let chip = static_init!(
        nrf52840::chip::NRF52<Nrf52840DefaultPeripherals>,
        nrf52840::chip::NRF52::new(nrf52840_peripherals)
    );
    CHIP = Some(chip);

    // Do nRF configuration and setup. This is shared code with other nRF-based
    // platforms.
    nrf52_components::startup::NrfStartupComponent::new(
        false,
        BUTTON_RST_PIN,
        nrf52840::uicr::Regulator0Output::DEFAULT,
        &base_peripherals.nvmc,
    )
    .finalize(());

    //--------------------------------------------------------------------------
    // CAPABILITIES
    //--------------------------------------------------------------------------

    // Create capabilities that the board needs to call certain protected kernel
    // functions.
    let main_loop_capability = create_capability!(capabilities::MainLoopCapability);

    //--------------------------------------------------------------------------
    // LEDs
    //--------------------------------------------------------------------------

    let led = components::led::LedsComponent::new().finalize(components::led_component_static!(
        LedLow<'static, nrf52840::gpio::GPIOPin>,
        LedLow::new(&nrf52840_peripherals.gpio_port[LED1_PIN]),
        LedLow::new(&nrf52840_peripherals.gpio_port[LED2_PIN]),
        LedLow::new(&nrf52840_peripherals.gpio_port[LED3_PIN]),
        LedLow::new(&nrf52840_peripherals.gpio_port[LED4_PIN]),
    ));

    //--------------------------------------------------------------------------
    // TIMER
    //--------------------------------------------------------------------------

    let rtc = &base_peripherals.rtc;
    let _ = rtc.start();
    let mux_alarm = components::alarm::AlarmMuxComponent::new(rtc)
        .finalize(components::alarm_mux_component_static!(nrf52840::rtc::Rtc));
    let alarm = components::alarm::AlarmDriverComponent::new(
        board_kernel,
        capsules_core::alarm::DRIVER_NUM,
        mux_alarm,
    )
    .finalize(components::alarm_component_static!(nrf52840::rtc::Rtc));

    //--------------------------------------------------------------------------
    // UART & CONSOLE & DEBUG
    //--------------------------------------------------------------------------

    let uart_channel = nrf52_components::UartChannelComponent::new(
        uart_channel,
        mux_alarm,
        &base_peripherals.uarte0,
    )
    .finalize(nrf52_components::uart_channel_component_static!(
        nrf52840::rtc::Rtc
    ));

    // Virtualize the UART channel for the console and for kernel debug.
    let uart_mux = components::console::UartMuxComponent::new(uart_channel, 115200)
        .finalize(components::uart_mux_component_static!());

    // Setup the serial console for userspace.
    let console = components::console::ConsoleComponent::new(
        board_kernel,
        capsules_core::console::DRIVER_NUM,
        uart_mux,
    )
    .finalize(components::console_component_static!());

    //--------------------------------------------------------------------------
    // NRF CLOCK SETUP
    //--------------------------------------------------------------------------

    nrf52_components::NrfClockComponent::new(&base_peripherals.clock).finalize(());

    //--------------------------------------------------------------------------
    // Credential Checking
    //--------------------------------------------------------------------------

    // Create the software-based SHA engine.
    let sha = components::sha::ShaSoftware256Component::new()
        .finalize(components::sha_software_256_component_static!());

    // Create the credential checker.
    //
    // Setup an example key.
    //
    // - `ec-secp256r1-priv-key.pem`:
    //   ```
    //   -----BEGIN EC PRIVATE KEY-----
    //   MHcCAQEEIGU0zCXHLqxDmrHHAWEQP5zNfWRQrAiIpH9YwxHlqysmoAoGCCqGSM49
    //   AwEHoUQDQgAE4BM6kKdKNWFRjuFECfFpwc9q239+Uvi3QXniTVdBI1IuthIDs4UQ
    //   5fMlB2KPVJWCV0VQvaPiF+g0MIkmTCNisQ==
    //   -----END EC PRIVATE KEY-----
    //   ```
    //
    // - `ec-secp256r1-pub-key.pem`:
    //   ```
    //   -----BEGIN PUBLIC KEY-----
    //   MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAE4BM6kKdKNWFRjuFECfFpwc9q239+
    //   Uvi3QXniTVdBI1IuthIDs4UQ5fMlB2KPVJWCV0VQvaPiF+g0MIkmTCNisQ==
    //   -----END PUBLIC KEY-----
    //   ```
    //
    // You can add the correct signature to a TBF by saving the private key to
    // a file and then running:
    //
    //     tockloader tbf credential add ecdsap256 --private-key ec-secp256r1-priv-key.pem
    //
    let verifying_key = kernel::static_init!(
        [u8; 64],
        [
            0xe0, 0x13, 0x3a, 0x90, 0xa7, 0x4a, 0x35, 0x61, 0x51, 0x8e, 0xe1, 0x44, 0x09, 0xf1,
            0x69, 0xc1, 0xcf, 0x6a, 0xdb, 0x7f, 0x7e, 0x52, 0xf8, 0xb7, 0x41, 0x79, 0xe2, 0x4d,
            0x57, 0x41, 0x23, 0x52, 0x2e, 0xb6, 0x12, 0x03, 0xb3, 0x85, 0x10, 0xe5, 0xf3, 0x25,
            0x07, 0x62, 0x8f, 0x54, 0x95, 0x82, 0x57, 0x45, 0x50, 0xbd, 0xa3, 0xe2, 0x17, 0xe8,
            0x34, 0x30, 0x89, 0x26, 0x4c, 0x23, 0x62, 0xb1
        ]
    );

    // Setup the ECDSA-P256 verifier.
    let ecdsa_p256_verifier = kernel::static_init!(
        ecdsa_sw::p256_verifier::EcdsaP256SignatureVerifier<'static>,
        ecdsa_sw::p256_verifier::EcdsaP256SignatureVerifier::new(verifying_key)
    );
    ecdsa_p256_verifier.register();

    // Policy checks for a valid EcdsaNistP256 signature.
    let checking_policy = components::appid::checker_signature::AppCheckerSignatureComponent::new(
        sha,
        ecdsa_p256_verifier,
        tock_tbf::types::TbfFooterV2CredentialsType::EcdsaNistP256,
    )
    .finalize(components::app_checker_signature_component_static!(
        ecdsa_sw::p256_verifier::EcdsaP256SignatureVerifier<'static>,
        capsules_extra::sha256::Sha256Software<'static>,
        32,
        64,
    ));

    // Create the AppID assigner.
    let assigner = components::appid::assigner_name::AppIdAssignerNamesComponent::new()
        .finalize(components::appid_assigner_names_component_static!());

    // Create the process checking machine.
    let checker = components::appid::checker::ProcessCheckerMachineComponent::new(checking_policy)
        .finalize(components::process_checker_machine_component_static!());

    //--------------------------------------------------------------------------
    // STORAGE PERMISSIONS
    //--------------------------------------------------------------------------

    let storage_permissions_policy =
        components::storage_permissions::null::StoragePermissionsNullComponent::new().finalize(
            components::storage_permissions_null_component_static!(
                nrf52840::chip::NRF52<Nrf52840DefaultPeripherals>,
                kernel::process::ProcessStandardDebugFull,
            ),
        );

    //--------------------------------------------------------------------------
    // PROCESS LOADING
    //--------------------------------------------------------------------------

    // These symbols are defined in the standard Tock linker script.
    extern "C" {
        /// Beginning of the ROM region containing app images.
        static _sapps: u8;
        /// End of the ROM region containing app images.
        static _eapps: u8;
        /// Beginning of the RAM region for app memory.
        static mut _sappmem: u8;
        /// End of the RAM region for app memory.
        static _eappmem: u8;
    }

    let app_flash = core::slice::from_raw_parts(
        core::ptr::addr_of!(_sapps),
        core::ptr::addr_of!(_eapps) as usize - core::ptr::addr_of!(_sapps) as usize,
    );
    let app_memory = core::slice::from_raw_parts_mut(
        core::ptr::addr_of_mut!(_sappmem),
        core::ptr::addr_of!(_eappmem) as usize - core::ptr::addr_of!(_sappmem) as usize,
    );

    // Create and start the asynchronous process loader.
    let _loader = components::loader::sequential::ProcessLoaderSequentialComponent::new(
        checker,
        &mut *addr_of_mut!(PROCESSES),
        board_kernel,
        chip,
        &FAULT_RESPONSE,
        assigner,
        storage_permissions_policy,
        app_flash,
        app_memory,
    )
    .finalize(components::process_loader_sequential_component_static!(
        nrf52840::chip::NRF52<Nrf52840DefaultPeripherals>,
        kernel::process::ProcessStandardDebugFull,
        NUM_PROCS
    ));

    //--------------------------------------------------------------------------
    // PLATFORM SETUP, SCHEDULER, AND START KERNEL LOOP
    //--------------------------------------------------------------------------

    let scheduler = components::sched::round_robin::RoundRobinComponent::new(&*addr_of!(PROCESSES))
        .finalize(components::round_robin_component_static!(NUM_PROCS));

    let platform = Platform {
        console,
        led,
        alarm,
        scheduler,
        systick: cortexm4::systick::SysTick::new_with_calibration(64000000),
    };

    board_kernel.kernel_loop(
        &platform,
        chip,
        None::<&kernel::ipc::IPC<0>>,
        &main_loop_capability,
    );
}