1254 lines
42 KiB
Rust
1254 lines
42 KiB
Rust
#![feature(type_alias_impl_trait)]
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#![no_std]
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#![warn(missing_docs)]
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#![doc = include_str!("../../README.md")]
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mod fmt;
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use embedded_storage::nor_flash::{ErrorType, NorFlash, NorFlashError, NorFlashErrorKind, ReadNorFlash};
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use embedded_storage_async::nor_flash::AsyncNorFlash;
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const BOOT_MAGIC: u8 = 0xD0;
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const SWAP_MAGIC: u8 = 0xF0;
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/// A region in flash used by the bootloader.
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#[derive(Copy, Clone, Debug)]
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#[cfg_attr(feature = "defmt", derive(defmt::Format))]
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pub struct Partition {
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/// Start of the flash region.
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pub from: usize,
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/// End of the flash region.
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pub to: usize,
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}
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impl Partition {
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/// Create a new partition with the provided range
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pub const fn new(from: usize, to: usize) -> Self {
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Self { from, to }
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}
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/// Return the length of the partition
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#[allow(clippy::len_without_is_empty)]
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pub const fn len(&self) -> usize {
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self.to - self.from
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}
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}
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/// The state of the bootloader after running prepare.
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#[derive(PartialEq, Eq, Debug)]
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#[cfg_attr(feature = "defmt", derive(defmt::Format))]
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pub enum State {
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/// Bootloader is ready to boot the active partition.
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Boot,
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/// Bootloader has swapped the active partition with the dfu partition and will attempt boot.
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Swap,
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}
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/// Errors returned by bootloader
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#[derive(PartialEq, Eq, Debug)]
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pub enum BootError {
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/// Error from flash.
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Flash(NorFlashErrorKind),
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/// Invalid bootloader magic
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BadMagic,
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}
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impl<E> From<E> for BootError
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where
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E: NorFlashError,
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{
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fn from(error: E) -> Self {
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BootError::Flash(error.kind())
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}
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}
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/// Buffer aligned to 32 byte boundary, largest known alignment requirement for embassy-boot.
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#[repr(align(32))]
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pub struct AlignedBuffer<const N: usize>(pub [u8; N]);
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impl<const N: usize> AsRef<[u8]> for AlignedBuffer<N> {
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fn as_ref(&self) -> &[u8] {
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&self.0
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}
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}
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impl<const N: usize> AsMut<[u8]> for AlignedBuffer<N> {
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fn as_mut(&mut self) -> &mut [u8] {
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&mut self.0
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}
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}
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/// Extension of the embedded-storage flash type information with block size and erase value.
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pub trait Flash: NorFlash + ReadNorFlash {
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/// The block size that should be used when writing to flash. For most builtin flashes, this is the same as the erase
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/// size of the flash, but for external QSPI flash modules, this can be lower.
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const BLOCK_SIZE: usize;
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/// The erase value of the flash. Typically the default of 0xFF is used, but some flashes use a different value.
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const ERASE_VALUE: u8 = 0xFF;
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}
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/// Trait defining the flash handles used for active and DFU partition
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pub trait FlashConfig {
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/// Flash type used for the state partition.
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type STATE: Flash;
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/// Flash type used for the active partition.
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type ACTIVE: Flash;
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/// Flash type used for the dfu partition.
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type DFU: Flash;
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/// Return flash instance used to write/read to/from active partition.
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fn active(&mut self) -> &mut Self::ACTIVE;
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/// Return flash instance used to write/read to/from dfu partition.
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fn dfu(&mut self) -> &mut Self::DFU;
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/// Return flash instance used to write/read to/from bootloader state.
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fn state(&mut self) -> &mut Self::STATE;
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}
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/// BootLoader works with any flash implementing embedded_storage and can also work with
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/// different page sizes and flash write sizes.
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pub struct BootLoader {
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// Page with current state of bootloader. The state partition has the following format:
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// | Range | Description |
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// | 0 - WRITE_SIZE | Magic indicating bootloader state. BOOT_MAGIC means boot, SWAP_MAGIC means swap. |
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// | WRITE_SIZE - N | Progress index used while swapping or reverting |
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state: Partition,
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// Location of the partition which will be booted from
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active: Partition,
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// Location of the partition which will be swapped in when requested
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dfu: Partition,
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}
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impl BootLoader {
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/// Create a new instance of a bootloader with the given partitions.
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///
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/// - All partitions must be aligned with the PAGE_SIZE const generic parameter.
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/// - The dfu partition must be at least PAGE_SIZE bigger than the active partition.
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pub fn new(active: Partition, dfu: Partition, state: Partition) -> Self {
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Self { active, dfu, state }
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}
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/// Return the boot address for the active partition.
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pub fn boot_address(&self) -> usize {
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self.active.from
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}
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/// Perform necessary boot preparations like swapping images.
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///
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/// The DFU partition is assumed to be 1 page bigger than the active partition for the swap
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/// algorithm to work correctly.
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///
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/// SWAPPING
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///
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/// Assume a flash size of 3 pages for the active partition, and 4 pages for the DFU partition.
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/// The swap index contains the copy progress, as to allow continuation of the copy process on
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/// power failure. The index counter is represented within 1 or more pages (depending on total
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/// flash size), where a page X is considered swapped if index at location (X + WRITE_SIZE)
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/// contains a zero value. This ensures that index updates can be performed atomically and
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/// avoid a situation where the wrong index value is set (page write size is "atomic").
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///
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/// +-----------+------------+--------+--------+--------+--------+
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/// | Partition | Swap Index | Page 0 | Page 1 | Page 3 | Page 4 |
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/// +-----------+------------+--------+--------+--------+--------+
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/// | Active | 0 | 1 | 2 | 3 | - |
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/// | DFU | 0 | 3 | 2 | 1 | X |
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/// +-----------+------------+--------+--------+--------+--------+
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///
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/// The algorithm starts by copying 'backwards', and after the first step, the layout is
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/// as follows:
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///
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/// +-----------+------------+--------+--------+--------+--------+
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/// | Partition | Swap Index | Page 0 | Page 1 | Page 3 | Page 4 |
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/// +-----------+------------+--------+--------+--------+--------+
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/// | Active | 1 | 1 | 2 | 1 | - |
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/// | DFU | 1 | 3 | 2 | 1 | 3 |
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/// +-----------+------------+--------+--------+--------+--------+
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///
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/// The next iteration performs the same steps
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///
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/// +-----------+------------+--------+--------+--------+--------+
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/// | Partition | Swap Index | Page 0 | Page 1 | Page 3 | Page 4 |
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/// +-----------+------------+--------+--------+--------+--------+
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/// | Active | 2 | 1 | 2 | 1 | - |
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/// | DFU | 2 | 3 | 2 | 2 | 3 |
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/// +-----------+------------+--------+--------+--------+--------+
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///
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/// And again until we're done
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///
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/// +-----------+------------+--------+--------+--------+--------+
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/// | Partition | Swap Index | Page 0 | Page 1 | Page 3 | Page 4 |
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/// +-----------+------------+--------+--------+--------+--------+
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/// | Active | 3 | 3 | 2 | 1 | - |
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/// | DFU | 3 | 3 | 1 | 2 | 3 |
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/// +-----------+------------+--------+--------+--------+--------+
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///
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/// REVERTING
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///
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/// The reverting algorithm uses the swap index to discover that images were swapped, but that
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/// the application failed to mark the boot successful. In this case, the revert algorithm will
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/// run.
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///
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/// The revert index is located separately from the swap index, to ensure that revert can continue
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/// on power failure.
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///
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/// The revert algorithm works forwards, by starting copying into the 'unused' DFU page at the start.
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///
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/// +-----------+--------------+--------+--------+--------+--------+
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/// | Partition | Revert Index | Page 0 | Page 1 | Page 3 | Page 4 |
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//*/
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/// +-----------+--------------+--------+--------+--------+--------+
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/// | Active | 3 | 1 | 2 | 1 | - |
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/// | DFU | 3 | 3 | 1 | 2 | 3 |
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/// +-----------+--------------+--------+--------+--------+--------+
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///
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///
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/// +-----------+--------------+--------+--------+--------+--------+
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/// | Partition | Revert Index | Page 0 | Page 1 | Page 3 | Page 4 |
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/// +-----------+--------------+--------+--------+--------+--------+
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/// | Active | 3 | 1 | 2 | 1 | - |
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/// | DFU | 3 | 3 | 2 | 2 | 3 |
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/// +-----------+--------------+--------+--------+--------+--------+
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///
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/// +-----------+--------------+--------+--------+--------+--------+
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/// | Partition | Revert Index | Page 0 | Page 1 | Page 3 | Page 4 |
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/// +-----------+--------------+--------+--------+--------+--------+
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/// | Active | 3 | 1 | 2 | 3 | - |
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/// | DFU | 3 | 3 | 2 | 1 | 3 |
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/// +-----------+--------------+--------+--------+--------+--------+
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///
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pub fn prepare_boot<P: FlashConfig>(
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&mut self,
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p: &mut P,
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magic: &mut [u8],
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page: &mut [u8],
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) -> Result<State, BootError> {
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// Ensure we have enough progress pages to store copy progress
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assert_partitions(self.active, self.dfu, self.state, page.len(), P::STATE::WRITE_SIZE);
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assert_eq!(magic.len(), P::STATE::WRITE_SIZE);
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// Copy contents from partition N to active
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let state = self.read_state(p, magic)?;
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if state == State::Swap {
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//
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// Check if we already swapped. If we're in the swap state, this means we should revert
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// since the app has failed to mark boot as successful
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//
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if !self.is_swapped(p, magic, page)? {
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trace!("Swapping");
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self.swap(p, magic, page)?;
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trace!("Swapping done");
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} else {
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trace!("Reverting");
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self.revert(p, magic, page)?;
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// Overwrite magic and reset progress
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let fstate = p.state();
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magic.fill(!P::STATE::ERASE_VALUE);
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fstate.write(self.state.from as u32, magic)?;
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fstate.erase(self.state.from as u32, self.state.to as u32)?;
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magic.fill(BOOT_MAGIC);
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fstate.write(self.state.from as u32, magic)?;
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}
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}
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Ok(state)
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}
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fn is_swapped<P: FlashConfig>(&mut self, p: &mut P, magic: &mut [u8], page: &mut [u8]) -> Result<bool, BootError> {
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let page_size = page.len();
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let page_count = self.active.len() / page_size;
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let progress = self.current_progress(p, magic)?;
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Ok(progress >= page_count * 2)
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}
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fn current_progress<P: FlashConfig>(&mut self, config: &mut P, aligned: &mut [u8]) -> Result<usize, BootError> {
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let write_size = aligned.len();
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let max_index = ((self.state.len() - write_size) / write_size) - 1;
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aligned.fill(!P::STATE::ERASE_VALUE);
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let flash = config.state();
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for i in 0..max_index {
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flash.read((self.state.from + write_size + i * write_size) as u32, aligned)?;
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if aligned.iter().any(|&b| b == P::STATE::ERASE_VALUE) {
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return Ok(i);
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}
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}
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Ok(max_index)
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}
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fn update_progress<P: FlashConfig>(&mut self, idx: usize, p: &mut P, magic: &mut [u8]) -> Result<(), BootError> {
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let flash = p.state();
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let write_size = magic.len();
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let w = self.state.from + write_size + idx * write_size;
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let aligned = magic;
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aligned.fill(!P::STATE::ERASE_VALUE);
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flash.write(w as u32, aligned)?;
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Ok(())
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}
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fn active_addr(&self, n: usize, page_size: usize) -> usize {
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self.active.from + n * page_size
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}
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fn dfu_addr(&self, n: usize, page_size: usize) -> usize {
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self.dfu.from + n * page_size
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}
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fn copy_page_once_to_active<P: FlashConfig>(
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&mut self,
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idx: usize,
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from_page: usize,
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to_page: usize,
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p: &mut P,
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magic: &mut [u8],
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page: &mut [u8],
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) -> Result<(), BootError> {
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let buf = page;
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if self.current_progress(p, magic)? <= idx {
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let mut offset = from_page;
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for chunk in buf.chunks_mut(P::DFU::BLOCK_SIZE) {
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p.dfu().read(offset as u32, chunk)?;
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offset += chunk.len();
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}
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p.active().erase(to_page as u32, (to_page + buf.len()) as u32)?;
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let mut offset = to_page;
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for chunk in buf.chunks(P::ACTIVE::BLOCK_SIZE) {
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p.active().write(offset as u32, chunk)?;
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offset += chunk.len();
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}
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self.update_progress(idx, p, magic)?;
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}
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Ok(())
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}
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fn copy_page_once_to_dfu<P: FlashConfig>(
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&mut self,
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idx: usize,
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from_page: usize,
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to_page: usize,
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p: &mut P,
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magic: &mut [u8],
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page: &mut [u8],
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) -> Result<(), BootError> {
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let buf = page;
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if self.current_progress(p, magic)? <= idx {
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let mut offset = from_page;
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for chunk in buf.chunks_mut(P::ACTIVE::BLOCK_SIZE) {
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p.active().read(offset as u32, chunk)?;
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offset += chunk.len();
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}
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p.dfu().erase(to_page as u32, (to_page + buf.len()) as u32)?;
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let mut offset = to_page;
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for chunk in buf.chunks(P::DFU::BLOCK_SIZE) {
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p.dfu().write(offset as u32, chunk)?;
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offset += chunk.len();
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}
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self.update_progress(idx, p, magic)?;
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}
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Ok(())
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}
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fn swap<P: FlashConfig>(&mut self, p: &mut P, magic: &mut [u8], page: &mut [u8]) -> Result<(), BootError> {
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let page_size = page.len();
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let page_count = self.active.len() / page_size;
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trace!("Page count: {}", page_count);
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for page_num in 0..page_count {
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trace!("COPY PAGE {}", page_num);
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// Copy active page to the 'next' DFU page.
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let active_page = self.active_addr(page_count - 1 - page_num, page_size);
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let dfu_page = self.dfu_addr(page_count - page_num, page_size);
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//trace!("Copy active {} to dfu {}", active_page, dfu_page);
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self.copy_page_once_to_dfu(page_num * 2, active_page, dfu_page, p, magic, page)?;
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// Copy DFU page to the active page
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let active_page = self.active_addr(page_count - 1 - page_num, page_size);
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let dfu_page = self.dfu_addr(page_count - 1 - page_num, page_size);
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//trace!("Copy dfy {} to active {}", dfu_page, active_page);
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self.copy_page_once_to_active(page_num * 2 + 1, dfu_page, active_page, p, magic, page)?;
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}
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Ok(())
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}
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fn revert<P: FlashConfig>(&mut self, p: &mut P, magic: &mut [u8], page: &mut [u8]) -> Result<(), BootError> {
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let page_size = page.len();
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let page_count = self.active.len() / page_size;
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for page_num in 0..page_count {
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// Copy the bad active page to the DFU page
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let active_page = self.active_addr(page_num, page_size);
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let dfu_page = self.dfu_addr(page_num, page_size);
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self.copy_page_once_to_dfu(page_count * 2 + page_num * 2, active_page, dfu_page, p, magic, page)?;
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// Copy the DFU page back to the active page
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let active_page = self.active_addr(page_num, page_size);
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let dfu_page = self.dfu_addr(page_num + 1, page_size);
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self.copy_page_once_to_active(page_count * 2 + page_num * 2 + 1, dfu_page, active_page, p, magic, page)?;
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}
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Ok(())
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}
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fn read_state<P: FlashConfig>(&mut self, config: &mut P, magic: &mut [u8]) -> Result<State, BootError> {
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let flash = config.state();
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flash.read(self.state.from as u32, magic)?;
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if !magic.iter().any(|&b| b != SWAP_MAGIC) {
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Ok(State::Swap)
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} else {
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Ok(State::Boot)
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}
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}
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}
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fn assert_partitions(active: Partition, dfu: Partition, state: Partition, page_size: usize, write_size: usize) {
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assert_eq!(active.len() % page_size, 0);
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assert_eq!(dfu.len() % page_size, 0);
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assert!(dfu.len() - active.len() >= page_size);
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assert!(2 * (active.len() / page_size) <= (state.len() - write_size) / write_size);
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}
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|
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/// Convenience provider that uses a single flash for all partitions.
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pub struct SingleFlashConfig<'a, F>
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where
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F: Flash,
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{
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flash: &'a mut F,
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}
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|
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impl<'a, F> SingleFlashConfig<'a, F>
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where
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F: Flash,
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{
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/// Create a provider for a single flash.
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pub fn new(flash: &'a mut F) -> Self {
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Self { flash }
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}
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}
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|
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impl<'a, F> FlashConfig for SingleFlashConfig<'a, F>
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where
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F: Flash,
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{
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type STATE = F;
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type ACTIVE = F;
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type DFU = F;
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fn active(&mut self) -> &mut Self::STATE {
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self.flash
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}
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fn dfu(&mut self) -> &mut Self::ACTIVE {
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self.flash
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}
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fn state(&mut self) -> &mut Self::DFU {
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self.flash
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}
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}
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|
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/// A flash wrapper implementing the Flash and embedded_storage traits.
|
|
pub struct BootFlash<F, const BLOCK_SIZE: usize, const ERASE_VALUE: u8 = 0xFF>
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|
where
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F: NorFlash + ReadNorFlash,
|
|
{
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flash: F,
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}
|
|
|
|
impl<F, const BLOCK_SIZE: usize, const ERASE_VALUE: u8> BootFlash<F, BLOCK_SIZE, ERASE_VALUE>
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|
where
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F: NorFlash + ReadNorFlash,
|
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{
|
|
/// Create a new instance of a bootable flash
|
|
pub fn new(flash: F) -> Self {
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Self { flash }
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}
|
|
}
|
|
|
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impl<F, const BLOCK_SIZE: usize, const ERASE_VALUE: u8> Flash for BootFlash<F, BLOCK_SIZE, ERASE_VALUE>
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|
where
|
|
F: NorFlash + ReadNorFlash,
|
|
{
|
|
const BLOCK_SIZE: usize = BLOCK_SIZE;
|
|
const ERASE_VALUE: u8 = ERASE_VALUE;
|
|
}
|
|
|
|
impl<F, const BLOCK_SIZE: usize, const ERASE_VALUE: u8> ErrorType for BootFlash<F, BLOCK_SIZE, ERASE_VALUE>
|
|
where
|
|
F: ReadNorFlash + NorFlash,
|
|
{
|
|
type Error = F::Error;
|
|
}
|
|
|
|
impl<F, const BLOCK_SIZE: usize, const ERASE_VALUE: u8> NorFlash for BootFlash<F, BLOCK_SIZE, ERASE_VALUE>
|
|
where
|
|
F: ReadNorFlash + NorFlash,
|
|
{
|
|
const WRITE_SIZE: usize = F::WRITE_SIZE;
|
|
const ERASE_SIZE: usize = F::ERASE_SIZE;
|
|
|
|
fn erase(&mut self, from: u32, to: u32) -> Result<(), Self::Error> {
|
|
F::erase(&mut self.flash, from, to)
|
|
}
|
|
|
|
fn write(&mut self, offset: u32, bytes: &[u8]) -> Result<(), Self::Error> {
|
|
F::write(&mut self.flash, offset, bytes)
|
|
}
|
|
}
|
|
|
|
impl<F, const BLOCK_SIZE: usize, const ERASE_VALUE: u8> ReadNorFlash for BootFlash<F, BLOCK_SIZE, ERASE_VALUE>
|
|
where
|
|
F: ReadNorFlash + NorFlash,
|
|
{
|
|
const READ_SIZE: usize = F::READ_SIZE;
|
|
|
|
fn read(&mut self, offset: u32, bytes: &mut [u8]) -> Result<(), Self::Error> {
|
|
F::read(&mut self.flash, offset, bytes)
|
|
}
|
|
|
|
fn capacity(&self) -> usize {
|
|
F::capacity(&self.flash)
|
|
}
|
|
}
|
|
|
|
/// Convenience flash provider that uses separate flash instances for each partition.
|
|
pub struct MultiFlashConfig<'a, ACTIVE, STATE, DFU>
|
|
where
|
|
ACTIVE: Flash,
|
|
STATE: Flash,
|
|
DFU: Flash,
|
|
{
|
|
active: &'a mut ACTIVE,
|
|
state: &'a mut STATE,
|
|
dfu: &'a mut DFU,
|
|
}
|
|
|
|
impl<'a, ACTIVE, STATE, DFU> MultiFlashConfig<'a, ACTIVE, STATE, DFU>
|
|
where
|
|
ACTIVE: Flash,
|
|
STATE: Flash,
|
|
DFU: Flash,
|
|
{
|
|
/// Create a new flash provider with separate configuration for all three partitions.
|
|
pub fn new(active: &'a mut ACTIVE, state: &'a mut STATE, dfu: &'a mut DFU) -> Self {
|
|
Self { active, state, dfu }
|
|
}
|
|
}
|
|
|
|
impl<'a, ACTIVE, STATE, DFU> FlashConfig for MultiFlashConfig<'a, ACTIVE, STATE, DFU>
|
|
where
|
|
ACTIVE: Flash,
|
|
STATE: Flash,
|
|
DFU: Flash,
|
|
{
|
|
type STATE = STATE;
|
|
type ACTIVE = ACTIVE;
|
|
type DFU = DFU;
|
|
|
|
fn active(&mut self) -> &mut Self::ACTIVE {
|
|
self.active
|
|
}
|
|
fn dfu(&mut self) -> &mut Self::DFU {
|
|
self.dfu
|
|
}
|
|
fn state(&mut self) -> &mut Self::STATE {
|
|
self.state
|
|
}
|
|
}
|
|
|
|
/// FirmwareUpdater is an application API for interacting with the BootLoader without the ability to
|
|
/// 'mess up' the internal bootloader state
|
|
pub struct FirmwareUpdater {
|
|
state: Partition,
|
|
dfu: Partition,
|
|
}
|
|
|
|
impl Default for FirmwareUpdater {
|
|
fn default() -> Self {
|
|
extern "C" {
|
|
static __bootloader_state_start: u32;
|
|
static __bootloader_state_end: u32;
|
|
static __bootloader_dfu_start: u32;
|
|
static __bootloader_dfu_end: u32;
|
|
}
|
|
|
|
let dfu = unsafe {
|
|
Partition::new(
|
|
&__bootloader_dfu_start as *const u32 as usize,
|
|
&__bootloader_dfu_end as *const u32 as usize,
|
|
)
|
|
};
|
|
let state = unsafe {
|
|
Partition::new(
|
|
&__bootloader_state_start as *const u32 as usize,
|
|
&__bootloader_state_end as *const u32 as usize,
|
|
)
|
|
};
|
|
|
|
trace!("DFU: 0x{:x} - 0x{:x}", dfu.from, dfu.to);
|
|
trace!("STATE: 0x{:x} - 0x{:x}", state.from, state.to);
|
|
FirmwareUpdater::new(dfu, state)
|
|
}
|
|
}
|
|
|
|
impl FirmwareUpdater {
|
|
/// Create a firmware updater instance with partition ranges for the update and state partitions.
|
|
pub const fn new(dfu: Partition, state: Partition) -> Self {
|
|
Self { dfu, state }
|
|
}
|
|
|
|
/// Return the length of the DFU area
|
|
pub fn firmware_len(&self) -> usize {
|
|
self.dfu.len()
|
|
}
|
|
|
|
/// Obtain the current state.
|
|
///
|
|
/// This is useful to check if the bootloader has just done a swap, in order
|
|
/// to do verifications and self-tests of the new image before calling
|
|
/// `mark_booted`.
|
|
pub async fn get_state<F: AsyncNorFlash>(&mut self, flash: &mut F, aligned: &mut [u8]) -> Result<State, F::Error> {
|
|
flash.read(self.state.from as u32, aligned).await?;
|
|
|
|
if !aligned.iter().any(|&b| b != SWAP_MAGIC) {
|
|
Ok(State::Swap)
|
|
} else {
|
|
Ok(State::Boot)
|
|
}
|
|
}
|
|
|
|
/// Mark to trigger firmware swap on next boot.
|
|
///
|
|
/// # Safety
|
|
///
|
|
/// The `aligned` buffer must have a size of F::WRITE_SIZE, and follow the alignment rules for the flash being written to.
|
|
pub async fn mark_updated<F: AsyncNorFlash>(&mut self, flash: &mut F, aligned: &mut [u8]) -> Result<(), F::Error> {
|
|
assert_eq!(aligned.len(), F::WRITE_SIZE);
|
|
self.set_magic(aligned, SWAP_MAGIC, flash).await
|
|
}
|
|
|
|
/// Mark firmware boot successful and stop rollback on reset.
|
|
///
|
|
/// # Safety
|
|
///
|
|
/// The `aligned` buffer must have a size of F::WRITE_SIZE, and follow the alignment rules for the flash being written to.
|
|
pub async fn mark_booted<F: AsyncNorFlash>(&mut self, flash: &mut F, aligned: &mut [u8]) -> Result<(), F::Error> {
|
|
assert_eq!(aligned.len(), F::WRITE_SIZE);
|
|
self.set_magic(aligned, BOOT_MAGIC, flash).await
|
|
}
|
|
|
|
async fn set_magic<F: AsyncNorFlash>(
|
|
&mut self,
|
|
aligned: &mut [u8],
|
|
magic: u8,
|
|
flash: &mut F,
|
|
) -> Result<(), F::Error> {
|
|
flash.read(self.state.from as u32, aligned).await?;
|
|
|
|
if aligned.iter().any(|&b| b != magic) {
|
|
aligned.fill(0);
|
|
|
|
flash.write(self.state.from as u32, aligned).await?;
|
|
flash.erase(self.state.from as u32, self.state.to as u32).await?;
|
|
|
|
aligned.fill(magic);
|
|
flash.write(self.state.from as u32, aligned).await?;
|
|
}
|
|
Ok(())
|
|
}
|
|
|
|
/// Write data to a flash page.
|
|
///
|
|
/// The buffer must follow alignment requirements of the target flash and a multiple of page size big.
|
|
///
|
|
/// # Safety
|
|
///
|
|
/// Failing to meet alignment and size requirements may result in a panic.
|
|
pub async fn write_firmware<F: AsyncNorFlash>(
|
|
&mut self,
|
|
offset: usize,
|
|
data: &[u8],
|
|
flash: &mut F,
|
|
block_size: usize,
|
|
) -> Result<(), F::Error> {
|
|
assert!(data.len() >= F::ERASE_SIZE);
|
|
|
|
flash
|
|
.erase(
|
|
(self.dfu.from + offset) as u32,
|
|
(self.dfu.from + offset + data.len()) as u32,
|
|
)
|
|
.await?;
|
|
|
|
trace!(
|
|
"Erased from {} to {}",
|
|
self.dfu.from + offset,
|
|
self.dfu.from + offset + data.len()
|
|
);
|
|
|
|
FirmwareWriter(self.dfu)
|
|
.write_block(offset, data, flash, block_size)
|
|
.await?;
|
|
|
|
Ok(())
|
|
}
|
|
|
|
/// Prepare for an incoming DFU update by erasing the entire DFU area and
|
|
/// returning a `FirmwareWriter`.
|
|
///
|
|
/// Using this instead of `write_firmware` allows for an optimized API in
|
|
/// exchange for added complexity.
|
|
pub async fn prepare_update<F: AsyncNorFlash>(&mut self, flash: &mut F) -> Result<FirmwareWriter, F::Error> {
|
|
flash.erase((self.dfu.from) as u32, (self.dfu.to) as u32).await?;
|
|
|
|
trace!("Erased from {} to {}", self.dfu.from, self.dfu.to);
|
|
|
|
Ok(FirmwareWriter(self.dfu))
|
|
}
|
|
|
|
//
|
|
// Blocking API
|
|
//
|
|
|
|
/// Obtain the current state.
|
|
///
|
|
/// This is useful to check if the bootloader has just done a swap, in order
|
|
/// to do verifications and self-tests of the new image before calling
|
|
/// `mark_booted`.
|
|
pub fn get_state_blocking<F: NorFlash>(&mut self, flash: &mut F, aligned: &mut [u8]) -> Result<State, F::Error> {
|
|
flash.read(self.state.from as u32, aligned)?;
|
|
|
|
if !aligned.iter().any(|&b| b != SWAP_MAGIC) {
|
|
Ok(State::Swap)
|
|
} else {
|
|
Ok(State::Boot)
|
|
}
|
|
}
|
|
|
|
/// Mark to trigger firmware swap on next boot.
|
|
///
|
|
/// # Safety
|
|
///
|
|
/// The `aligned` buffer must have a size of F::WRITE_SIZE, and follow the alignment rules for the flash being written to.
|
|
pub fn mark_updated_blocking<F: NorFlash>(&mut self, flash: &mut F, aligned: &mut [u8]) -> Result<(), F::Error> {
|
|
assert_eq!(aligned.len(), F::WRITE_SIZE);
|
|
self.set_magic_blocking(aligned, SWAP_MAGIC, flash)
|
|
}
|
|
|
|
/// Mark firmware boot successful and stop rollback on reset.
|
|
///
|
|
/// # Safety
|
|
///
|
|
/// The `aligned` buffer must have a size of F::WRITE_SIZE, and follow the alignment rules for the flash being written to.
|
|
pub fn mark_booted_blocking<F: NorFlash>(&mut self, flash: &mut F, aligned: &mut [u8]) -> Result<(), F::Error> {
|
|
assert_eq!(aligned.len(), F::WRITE_SIZE);
|
|
self.set_magic_blocking(aligned, BOOT_MAGIC, flash)
|
|
}
|
|
|
|
fn set_magic_blocking<F: NorFlash>(
|
|
&mut self,
|
|
aligned: &mut [u8],
|
|
magic: u8,
|
|
flash: &mut F,
|
|
) -> Result<(), F::Error> {
|
|
flash.read(self.state.from as u32, aligned)?;
|
|
|
|
if aligned.iter().any(|&b| b != magic) {
|
|
aligned.fill(0);
|
|
|
|
flash.write(self.state.from as u32, aligned)?;
|
|
flash.erase(self.state.from as u32, self.state.to as u32)?;
|
|
|
|
aligned.fill(magic);
|
|
flash.write(self.state.from as u32, aligned)?;
|
|
}
|
|
Ok(())
|
|
}
|
|
|
|
/// Write data to a flash page.
|
|
///
|
|
/// The buffer must follow alignment requirements of the target flash and a multiple of page size big.
|
|
///
|
|
/// # Safety
|
|
///
|
|
/// Failing to meet alignment and size requirements may result in a panic.
|
|
pub fn write_firmware_blocking<F: NorFlash>(
|
|
&mut self,
|
|
offset: usize,
|
|
data: &[u8],
|
|
flash: &mut F,
|
|
block_size: usize,
|
|
) -> Result<(), F::Error> {
|
|
assert!(data.len() >= F::ERASE_SIZE);
|
|
|
|
flash.erase(
|
|
(self.dfu.from + offset) as u32,
|
|
(self.dfu.from + offset + data.len()) as u32,
|
|
)?;
|
|
|
|
trace!(
|
|
"Erased from {} to {}",
|
|
self.dfu.from + offset,
|
|
self.dfu.from + offset + data.len()
|
|
);
|
|
|
|
FirmwareWriter(self.dfu).write_block_blocking(offset, data, flash, block_size)?;
|
|
|
|
Ok(())
|
|
}
|
|
|
|
/// Prepare for an incoming DFU update by erasing the entire DFU area and
|
|
/// returning a `FirmwareWriter`.
|
|
///
|
|
/// Using this instead of `write_firmware_blocking` allows for an optimized
|
|
/// API in exchange for added complexity.
|
|
pub fn prepare_update_blocking<F: NorFlash>(&mut self, flash: &mut F) -> Result<FirmwareWriter, F::Error> {
|
|
flash.erase((self.dfu.from) as u32, (self.dfu.to) as u32)?;
|
|
|
|
trace!("Erased from {} to {}", self.dfu.from, self.dfu.to);
|
|
|
|
Ok(FirmwareWriter(self.dfu))
|
|
}
|
|
}
|
|
|
|
/// FirmwareWriter allows writing blocks to an already erased flash.
|
|
pub struct FirmwareWriter(Partition);
|
|
|
|
impl FirmwareWriter {
|
|
/// Write data to a flash page.
|
|
///
|
|
/// The buffer must follow alignment requirements of the target flash and a multiple of page size big.
|
|
///
|
|
/// # Safety
|
|
///
|
|
/// Failing to meet alignment and size requirements may result in a panic.
|
|
pub async fn write_block<F: AsyncNorFlash>(
|
|
&mut self,
|
|
offset: usize,
|
|
data: &[u8],
|
|
flash: &mut F,
|
|
block_size: usize,
|
|
) -> Result<(), F::Error> {
|
|
trace!(
|
|
"Writing firmware at offset 0x{:x} len {}",
|
|
self.0.from + offset,
|
|
data.len()
|
|
);
|
|
|
|
let mut write_offset = self.0.from + offset;
|
|
for chunk in data.chunks(block_size) {
|
|
trace!("Wrote chunk at {}: {:?}", write_offset, chunk);
|
|
flash.write(write_offset as u32, chunk).await?;
|
|
write_offset += chunk.len();
|
|
}
|
|
/*
|
|
trace!("Wrote data, reading back for verification");
|
|
|
|
let mut buf: [u8; 4096] = [0; 4096];
|
|
let mut data_offset = 0;
|
|
let mut read_offset = self.dfu.from + offset;
|
|
for chunk in buf.chunks_mut(block_size) {
|
|
flash.read(read_offset as u32, chunk).await?;
|
|
trace!("Read chunk at {}: {:?}", read_offset, chunk);
|
|
assert_eq!(&data[data_offset..data_offset + block_size], chunk);
|
|
read_offset += chunk.len();
|
|
data_offset += chunk.len();
|
|
}
|
|
*/
|
|
|
|
Ok(())
|
|
}
|
|
|
|
/// Write data to a flash page.
|
|
///
|
|
/// The buffer must follow alignment requirements of the target flash and a multiple of page size big.
|
|
///
|
|
/// # Safety
|
|
///
|
|
/// Failing to meet alignment and size requirements may result in a panic.
|
|
pub fn write_block_blocking<F: NorFlash>(
|
|
&mut self,
|
|
offset: usize,
|
|
data: &[u8],
|
|
flash: &mut F,
|
|
block_size: usize,
|
|
) -> Result<(), F::Error> {
|
|
trace!(
|
|
"Writing firmware at offset 0x{:x} len {}",
|
|
self.0.from + offset,
|
|
data.len()
|
|
);
|
|
|
|
let mut write_offset = self.0.from + offset;
|
|
for chunk in data.chunks(block_size) {
|
|
trace!("Wrote chunk at {}: {:?}", write_offset, chunk);
|
|
flash.write(write_offset as u32, chunk)?;
|
|
write_offset += chunk.len();
|
|
}
|
|
/*
|
|
trace!("Wrote data, reading back for verification");
|
|
|
|
let mut buf: [u8; 4096] = [0; 4096];
|
|
let mut data_offset = 0;
|
|
let mut read_offset = self.dfu.from + offset;
|
|
for chunk in buf.chunks_mut(block_size) {
|
|
flash.read(read_offset as u32, chunk).await?;
|
|
trace!("Read chunk at {}: {:?}", read_offset, chunk);
|
|
assert_eq!(&data[data_offset..data_offset + block_size], chunk);
|
|
read_offset += chunk.len();
|
|
data_offset += chunk.len();
|
|
}
|
|
*/
|
|
|
|
Ok(())
|
|
}
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use core::convert::Infallible;
|
|
use core::future::Future;
|
|
|
|
use embedded_storage::nor_flash::ErrorType;
|
|
use embedded_storage_async::nor_flash::AsyncReadNorFlash;
|
|
use futures::executor::block_on;
|
|
|
|
use super::*;
|
|
|
|
/*
|
|
#[test]
|
|
fn test_bad_magic() {
|
|
let mut flash = MemFlash([0xff; 131072]);
|
|
let mut flash = SingleFlashConfig::new(&mut flash);
|
|
|
|
let mut bootloader = BootLoader::<4096>::new(ACTIVE, DFU, STATE);
|
|
|
|
assert_eq!(
|
|
bootloader.prepare_boot(&mut flash),
|
|
Err(BootError::BadMagic)
|
|
);
|
|
}
|
|
*/
|
|
|
|
#[test]
|
|
fn test_boot_state() {
|
|
const STATE: Partition = Partition::new(0, 4096);
|
|
const ACTIVE: Partition = Partition::new(4096, 61440);
|
|
const DFU: Partition = Partition::new(61440, 122880);
|
|
|
|
let mut flash = MemFlash::<131072, 4096, 4>([0xff; 131072]);
|
|
flash.0[0..4].copy_from_slice(&[BOOT_MAGIC; 4]);
|
|
let mut flash = SingleFlashConfig::new(&mut flash);
|
|
|
|
let mut bootloader: BootLoader = BootLoader::new(ACTIVE, DFU, STATE);
|
|
|
|
let mut magic = [0; 4];
|
|
let mut page = [0; 4096];
|
|
assert_eq!(
|
|
State::Boot,
|
|
bootloader.prepare_boot(&mut flash, &mut magic, &mut page).unwrap()
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn test_swap_state() {
|
|
const STATE: Partition = Partition::new(0, 4096);
|
|
const ACTIVE: Partition = Partition::new(4096, 61440);
|
|
const DFU: Partition = Partition::new(61440, 122880);
|
|
let mut flash = MemFlash::<131072, 4096, 4>([0xff; 131072]);
|
|
|
|
let original: [u8; ACTIVE.len()] = [rand::random::<u8>(); ACTIVE.len()];
|
|
let update: [u8; DFU.len()] = [rand::random::<u8>(); DFU.len()];
|
|
let mut aligned = [0; 4];
|
|
|
|
for i in ACTIVE.from..ACTIVE.to {
|
|
flash.0[i] = original[i - ACTIVE.from];
|
|
}
|
|
|
|
let mut bootloader: BootLoader = BootLoader::new(ACTIVE, DFU, STATE);
|
|
let mut updater = FirmwareUpdater::new(DFU, STATE);
|
|
let mut offset = 0;
|
|
for chunk in update.chunks(4096) {
|
|
block_on(updater.write_firmware(offset, chunk, &mut flash, 4096)).unwrap();
|
|
offset += chunk.len();
|
|
}
|
|
block_on(updater.mark_updated(&mut flash, &mut aligned)).unwrap();
|
|
|
|
let mut magic = [0; 4];
|
|
let mut page = [0; 4096];
|
|
assert_eq!(
|
|
State::Swap,
|
|
bootloader
|
|
.prepare_boot(&mut SingleFlashConfig::new(&mut flash), &mut magic, &mut page)
|
|
.unwrap()
|
|
);
|
|
|
|
for i in ACTIVE.from..ACTIVE.to {
|
|
assert_eq!(flash.0[i], update[i - ACTIVE.from], "Index {}", i);
|
|
}
|
|
|
|
// First DFU page is untouched
|
|
for i in DFU.from + 4096..DFU.to {
|
|
assert_eq!(flash.0[i], original[i - DFU.from - 4096], "Index {}", i);
|
|
}
|
|
|
|
// Running again should cause a revert
|
|
assert_eq!(
|
|
State::Swap,
|
|
bootloader
|
|
.prepare_boot(&mut SingleFlashConfig::new(&mut flash), &mut magic, &mut page)
|
|
.unwrap()
|
|
);
|
|
|
|
for i in ACTIVE.from..ACTIVE.to {
|
|
assert_eq!(flash.0[i], original[i - ACTIVE.from], "Index {}", i);
|
|
}
|
|
|
|
// Last page is untouched
|
|
for i in DFU.from..DFU.to - 4096 {
|
|
assert_eq!(flash.0[i], update[i - DFU.from], "Index {}", i);
|
|
}
|
|
|
|
// Mark as booted
|
|
block_on(updater.mark_booted(&mut flash, &mut aligned)).unwrap();
|
|
assert_eq!(
|
|
State::Boot,
|
|
bootloader
|
|
.prepare_boot(&mut SingleFlashConfig::new(&mut flash), &mut magic, &mut page)
|
|
.unwrap()
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn test_separate_flash_active_page_biggest() {
|
|
const STATE: Partition = Partition::new(2048, 4096);
|
|
const ACTIVE: Partition = Partition::new(4096, 16384);
|
|
const DFU: Partition = Partition::new(0, 16384);
|
|
|
|
let mut active = MemFlash::<16384, 4096, 8>([0xff; 16384]);
|
|
let mut dfu = MemFlash::<16384, 2048, 8>([0xff; 16384]);
|
|
let mut state = MemFlash::<4096, 128, 4>([0xff; 4096]);
|
|
let mut aligned = [0; 4];
|
|
|
|
let original: [u8; ACTIVE.len()] = [rand::random::<u8>(); ACTIVE.len()];
|
|
let update: [u8; DFU.len()] = [rand::random::<u8>(); DFU.len()];
|
|
|
|
for i in ACTIVE.from..ACTIVE.to {
|
|
active.0[i] = original[i - ACTIVE.from];
|
|
}
|
|
|
|
let mut updater = FirmwareUpdater::new(DFU, STATE);
|
|
|
|
let mut offset = 0;
|
|
for chunk in update.chunks(2048) {
|
|
block_on(updater.write_firmware(offset, chunk, &mut dfu, chunk.len())).unwrap();
|
|
offset += chunk.len();
|
|
}
|
|
block_on(updater.mark_updated(&mut state, &mut aligned)).unwrap();
|
|
|
|
let mut bootloader: BootLoader = BootLoader::new(ACTIVE, DFU, STATE);
|
|
let mut magic = [0; 4];
|
|
let mut page = [0; 4096];
|
|
|
|
assert_eq!(
|
|
State::Swap,
|
|
bootloader
|
|
.prepare_boot(
|
|
&mut MultiFlashConfig::new(&mut active, &mut state, &mut dfu),
|
|
&mut magic,
|
|
&mut page
|
|
)
|
|
.unwrap()
|
|
);
|
|
|
|
for i in ACTIVE.from..ACTIVE.to {
|
|
assert_eq!(active.0[i], update[i - ACTIVE.from], "Index {}", i);
|
|
}
|
|
|
|
// First DFU page is untouched
|
|
for i in DFU.from + 4096..DFU.to {
|
|
assert_eq!(dfu.0[i], original[i - DFU.from - 4096], "Index {}", i);
|
|
}
|
|
}
|
|
|
|
#[test]
|
|
fn test_separate_flash_dfu_page_biggest() {
|
|
const STATE: Partition = Partition::new(2048, 4096);
|
|
const ACTIVE: Partition = Partition::new(4096, 16384);
|
|
const DFU: Partition = Partition::new(0, 16384);
|
|
|
|
let mut aligned = [0; 4];
|
|
let mut active = MemFlash::<16384, 2048, 4>([0xff; 16384]);
|
|
let mut dfu = MemFlash::<16384, 4096, 8>([0xff; 16384]);
|
|
let mut state = MemFlash::<4096, 128, 4>([0xff; 4096]);
|
|
|
|
let original: [u8; ACTIVE.len()] = [rand::random::<u8>(); ACTIVE.len()];
|
|
let update: [u8; DFU.len()] = [rand::random::<u8>(); DFU.len()];
|
|
|
|
for i in ACTIVE.from..ACTIVE.to {
|
|
active.0[i] = original[i - ACTIVE.from];
|
|
}
|
|
|
|
let mut updater = FirmwareUpdater::new(DFU, STATE);
|
|
|
|
let mut offset = 0;
|
|
for chunk in update.chunks(4096) {
|
|
block_on(updater.write_firmware(offset, chunk, &mut dfu, chunk.len())).unwrap();
|
|
offset += chunk.len();
|
|
}
|
|
block_on(updater.mark_updated(&mut state, &mut aligned)).unwrap();
|
|
|
|
let mut bootloader: BootLoader = BootLoader::new(ACTIVE, DFU, STATE);
|
|
let mut magic = [0; 4];
|
|
let mut page = [0; 4096];
|
|
assert_eq!(
|
|
State::Swap,
|
|
bootloader
|
|
.prepare_boot(
|
|
&mut MultiFlashConfig::new(&mut active, &mut state, &mut dfu,),
|
|
&mut magic,
|
|
&mut page
|
|
)
|
|
.unwrap()
|
|
);
|
|
|
|
for i in ACTIVE.from..ACTIVE.to {
|
|
assert_eq!(active.0[i], update[i - ACTIVE.from], "Index {}", i);
|
|
}
|
|
|
|
// First DFU page is untouched
|
|
for i in DFU.from + 4096..DFU.to {
|
|
assert_eq!(dfu.0[i], original[i - DFU.from - 4096], "Index {}", i);
|
|
}
|
|
}
|
|
|
|
#[test]
|
|
#[should_panic]
|
|
fn test_range_asserts() {
|
|
const ACTIVE: Partition = Partition::new(4096, 4194304);
|
|
const DFU: Partition = Partition::new(4194304, 2 * 4194304);
|
|
const STATE: Partition = Partition::new(0, 4096);
|
|
assert_partitions(ACTIVE, DFU, STATE, 4096, 4);
|
|
}
|
|
|
|
struct MemFlash<const SIZE: usize, const ERASE_SIZE: usize, const WRITE_SIZE: usize>([u8; SIZE]);
|
|
|
|
impl<const SIZE: usize, const ERASE_SIZE: usize, const WRITE_SIZE: usize> NorFlash
|
|
for MemFlash<SIZE, ERASE_SIZE, WRITE_SIZE>
|
|
{
|
|
const WRITE_SIZE: usize = WRITE_SIZE;
|
|
const ERASE_SIZE: usize = ERASE_SIZE;
|
|
fn erase(&mut self, from: u32, to: u32) -> Result<(), Self::Error> {
|
|
let from = from as usize;
|
|
let to = to as usize;
|
|
assert!(from % ERASE_SIZE == 0);
|
|
assert!(to % ERASE_SIZE == 0, "To: {}, erase size: {}", to, ERASE_SIZE);
|
|
for i in from..to {
|
|
self.0[i] = 0xFF;
|
|
}
|
|
Ok(())
|
|
}
|
|
|
|
fn write(&mut self, offset: u32, data: &[u8]) -> Result<(), Self::Error> {
|
|
assert!(data.len() % WRITE_SIZE == 0);
|
|
assert!(offset as usize % WRITE_SIZE == 0);
|
|
assert!(offset as usize + data.len() <= SIZE);
|
|
|
|
self.0[offset as usize..offset as usize + data.len()].copy_from_slice(data);
|
|
|
|
Ok(())
|
|
}
|
|
}
|
|
|
|
impl<const SIZE: usize, const ERASE_SIZE: usize, const WRITE_SIZE: usize> ErrorType
|
|
for MemFlash<SIZE, ERASE_SIZE, WRITE_SIZE>
|
|
{
|
|
type Error = Infallible;
|
|
}
|
|
|
|
impl<const SIZE: usize, const ERASE_SIZE: usize, const WRITE_SIZE: usize> ReadNorFlash
|
|
for MemFlash<SIZE, ERASE_SIZE, WRITE_SIZE>
|
|
{
|
|
const READ_SIZE: usize = 4;
|
|
|
|
fn read(&mut self, offset: u32, buf: &mut [u8]) -> Result<(), Self::Error> {
|
|
let len = buf.len();
|
|
buf[..].copy_from_slice(&self.0[offset as usize..offset as usize + len]);
|
|
Ok(())
|
|
}
|
|
|
|
fn capacity(&self) -> usize {
|
|
SIZE
|
|
}
|
|
}
|
|
|
|
impl<const SIZE: usize, const ERASE_SIZE: usize, const WRITE_SIZE: usize> super::Flash
|
|
for MemFlash<SIZE, ERASE_SIZE, WRITE_SIZE>
|
|
{
|
|
const BLOCK_SIZE: usize = ERASE_SIZE;
|
|
const ERASE_VALUE: u8 = 0xFF;
|
|
}
|
|
|
|
impl<const SIZE: usize, const ERASE_SIZE: usize, const WRITE_SIZE: usize> AsyncReadNorFlash
|
|
for MemFlash<SIZE, ERASE_SIZE, WRITE_SIZE>
|
|
{
|
|
const READ_SIZE: usize = 4;
|
|
|
|
type ReadFuture<'a> = impl Future<Output = Result<(), Self::Error>> + 'a;
|
|
fn read<'a>(&'a mut self, offset: u32, buf: &'a mut [u8]) -> Self::ReadFuture<'a> {
|
|
async move {
|
|
let len = buf.len();
|
|
buf[..].copy_from_slice(&self.0[offset as usize..offset as usize + len]);
|
|
Ok(())
|
|
}
|
|
}
|
|
|
|
fn capacity(&self) -> usize {
|
|
SIZE
|
|
}
|
|
}
|
|
|
|
impl<const SIZE: usize, const ERASE_SIZE: usize, const WRITE_SIZE: usize> AsyncNorFlash
|
|
for MemFlash<SIZE, ERASE_SIZE, WRITE_SIZE>
|
|
{
|
|
const WRITE_SIZE: usize = WRITE_SIZE;
|
|
const ERASE_SIZE: usize = ERASE_SIZE;
|
|
|
|
type EraseFuture<'a> = impl Future<Output = Result<(), Self::Error>> + 'a;
|
|
fn erase(&mut self, from: u32, to: u32) -> Self::EraseFuture<'_> {
|
|
async move {
|
|
let from = from as usize;
|
|
let to = to as usize;
|
|
assert!(from % ERASE_SIZE == 0);
|
|
assert!(to % ERASE_SIZE == 0);
|
|
for i in from..to {
|
|
self.0[i] = 0xFF;
|
|
}
|
|
Ok(())
|
|
}
|
|
}
|
|
|
|
type WriteFuture<'a> = impl Future<Output = Result<(), Self::Error>> + 'a;
|
|
fn write<'a>(&'a mut self, offset: u32, data: &'a [u8]) -> Self::WriteFuture<'a> {
|
|
info!("Writing {} bytes to 0x{:x}", data.len(), offset);
|
|
async move {
|
|
assert!(data.len() % WRITE_SIZE == 0);
|
|
assert!(offset as usize % WRITE_SIZE == 0);
|
|
assert!(
|
|
offset as usize + data.len() <= SIZE,
|
|
"OFFSET: {}, LEN: {}, FLASH SIZE: {}",
|
|
offset,
|
|
data.len(),
|
|
SIZE
|
|
);
|
|
|
|
self.0[offset as usize..offset as usize + data.len()].copy_from_slice(data);
|
|
|
|
Ok(())
|
|
}
|
|
}
|
|
}
|
|
}
|