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Remove magic buffer argument from prepare_boot

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and use the aligned page buffer instead
This commit is contained in:
Rasmus Melchior Jacobsen 2023-04-04 20:25:55 +02:00
parent 5923e143e3
commit 9242ad89d4
2 changed files with 78 additions and 78 deletions
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134
embassy-boot/boot/src/boot_loader.rs
View file

@ -56,6 +56,16 @@ pub trait FlashConfig {
fn state(&mut self) -> &mut Self::STATE;
}
trait FlashConfigEx {
fn page_size() -> usize;
}
impl<T: FlashConfig> FlashConfigEx for T {
fn page_size() -> usize {
core::cmp::max(T::ACTIVE::ERASE_SIZE, T::DFU::ERASE_SIZE)
}
}
/// BootLoader works with any flash implementing embedded_storage and can also work with
/// different page sizes and flash write sizes.
pub struct BootLoader {
@ -91,6 +101,9 @@ impl BootLoader {
/// The DFU partition is assumed to be 1 page bigger than the active partition for the swap
/// algorithm to work correctly.
///
/// The provided aligned_buf argument must satisfy any alignment requirements
/// given by the partition flashes. All flash operations will use this buffer.
///
/// SWAPPING
///
/// Assume a flash size of 3 pages for the active partition, and 4 pages for the DFU partition.
@ -169,87 +182,89 @@ impl BootLoader {
/// | DFU | 3 | 3 | 2 | 1 | 3 |
/// +-----------+--------------+--------+--------+--------+--------+
///
pub fn prepare_boot<P: FlashConfig>(
&mut self,
p: &mut P,
magic: &mut [u8],
page: &mut [u8],
) -> Result<State, BootError> {
pub fn prepare_boot<P: FlashConfig>(&mut self, p: &mut P, aligned_buf: &mut [u8]) -> Result<State, BootError> {
// Ensure we have enough progress pages to store copy progress
assert_partitions(self.active, self.dfu, self.state, page.len(), P::STATE::WRITE_SIZE);
assert_eq!(magic.len(), P::STATE::WRITE_SIZE);
assert_eq!(aligned_buf.len(), P::page_size());
assert!(aligned_buf.len() >= P::STATE::WRITE_SIZE);
assert_partitions(self.active, self.dfu, self.state, P::page_size(), P::STATE::WRITE_SIZE);
// Copy contents from partition N to active
let state = self.read_state(p, magic)?;
let state = self.read_state(p, aligned_buf)?;
if state == State::Swap {
//
// Check if we already swapped. If we're in the swap state, this means we should revert
// since the app has failed to mark boot as successful
//
if !self.is_swapped(p, magic, page)? {
if !self.is_swapped(p, aligned_buf)? {
trace!("Swapping");
self.swap(p, magic, page)?;
self.swap(p, aligned_buf)?;
trace!("Swapping done");
} else {
trace!("Reverting");
self.revert(p, magic, page)?;
self.revert(p, aligned_buf)?;
let state_flash = p.state();
let state_word = &mut aligned_buf[..P::STATE::WRITE_SIZE];
// Invalidate progress
magic.fill(!P::STATE::ERASE_VALUE);
state_word.fill(!P::STATE::ERASE_VALUE);
self.state
.write_blocking(state_flash, P::STATE::WRITE_SIZE as u32, magic)?;
.write_blocking(state_flash, P::STATE::WRITE_SIZE as u32, state_word)?;
// Clear magic and progress
self.state.wipe_blocking(state_flash)?;
// Set magic
magic.fill(BOOT_MAGIC);
self.state.write_blocking(state_flash, 0, magic)?;
state_word.fill(BOOT_MAGIC);
self.state.write_blocking(state_flash, 0, state_word)?;
}
}
Ok(state)
}
fn is_swapped<P: FlashConfig>(&mut self, p: &mut P, magic: &mut [u8], page: &mut [u8]) -> Result<bool, BootError> {
let page_size = page.len();
let page_count = self.active.len() / page_size;
let progress = self.current_progress(p, magic)?;
fn is_swapped<P: FlashConfig>(&mut self, p: &mut P, aligned_buf: &mut [u8]) -> Result<bool, BootError> {
let page_count = self.active.len() / P::page_size();
let progress = self.current_progress(p, aligned_buf)?;
Ok(progress >= page_count * 2)
}
fn current_progress<P: FlashConfig>(&mut self, config: &mut P, aligned: &mut [u8]) -> Result<usize, BootError> {
let write_size = aligned.len();
let max_index = ((self.state.len() - write_size) / write_size) - 2;
aligned.fill(!P::STATE::ERASE_VALUE);
fn current_progress<P: FlashConfig>(&mut self, config: &mut P, aligned_buf: &mut [u8]) -> Result<usize, BootError> {
let max_index = ((self.state.len() - P::STATE::WRITE_SIZE) / P::STATE::WRITE_SIZE) - 2;
let state_flash = config.state();
let state_word = &mut aligned_buf[..P::STATE::WRITE_SIZE];
self.state
.read_blocking(state_flash, P::STATE::WRITE_SIZE as u32, aligned)?;
if aligned.iter().any(|&b| b != P::STATE::ERASE_VALUE) {
.read_blocking(state_flash, P::STATE::WRITE_SIZE as u32, state_word)?;
if state_word.iter().any(|&b| b != P::STATE::ERASE_VALUE) {
// Progress is invalid
return Ok(max_index);
}
for index in 0..max_index {
self.state
.read_blocking(state_flash, (2 + index) as u32 * P::STATE::WRITE_SIZE as u32, aligned)?;
self.state.read_blocking(
state_flash,
(2 + index) as u32 * P::STATE::WRITE_SIZE as u32,
state_word,
)?;
if aligned.iter().any(|&b| b == P::STATE::ERASE_VALUE) {
if state_word.iter().any(|&b| b == P::STATE::ERASE_VALUE) {
return Ok(index);
}
}
Ok(max_index)
}
fn update_progress<P: FlashConfig>(&mut self, index: usize, p: &mut P, magic: &mut [u8]) -> Result<(), BootError> {
let aligned = magic;
aligned.fill(!P::STATE::ERASE_VALUE);
fn update_progress<P: FlashConfig>(
&mut self,
index: usize,
p: &mut P,
aligned_buf: &mut [u8],
) -> Result<(), BootError> {
let state_word = &mut aligned_buf[..P::STATE::WRITE_SIZE];
state_word.fill(!P::STATE::ERASE_VALUE);
self.state
.write_blocking(p.state(), (2 + index) as u32 * P::STATE::WRITE_SIZE as u32, aligned)?;
.write_blocking(p.state(), (2 + index) as u32 * P::STATE::WRITE_SIZE as u32, state_word)?;
Ok(())
}
@ -259,26 +274,24 @@ impl BootLoader {
from_offset: u32,
to_offset: u32,
p: &mut P,
magic: &mut [u8],
page: &mut [u8],
aligned_buf: &mut [u8],
) -> Result<(), BootError> {
let buf = page;
if self.current_progress(p, magic)? <= idx {
if self.current_progress(p, aligned_buf)? <= idx {
let mut offset = from_offset;
for chunk in buf.chunks_mut(P::DFU::BLOCK_SIZE) {
for chunk in aligned_buf.chunks_mut(P::DFU::BLOCK_SIZE) {
self.dfu.read_blocking(p.dfu(), offset, chunk)?;
offset += chunk.len() as u32;
}
self.active
.erase_blocking(p.active(), to_offset, to_offset + buf.len() as u32)?;
.erase_blocking(p.active(), to_offset, to_offset + P::page_size() as u32)?;
let mut offset = to_offset;
for chunk in buf.chunks(P::ACTIVE::BLOCK_SIZE) {
for chunk in aligned_buf.chunks(P::ACTIVE::BLOCK_SIZE) {
self.active.write_blocking(p.active(), offset, chunk)?;
offset += chunk.len() as u32;
}
self.update_progress(idx, p, magic)?;
self.update_progress(idx, p, aligned_buf)?;
}
Ok(())
}
@ -289,32 +302,30 @@ impl BootLoader {
from_offset: u32,
to_offset: u32,
p: &mut P,
magic: &mut [u8],
page: &mut [u8],
aligned_buf: &mut [u8],
) -> Result<(), BootError> {
let buf = page;
if self.current_progress(p, magic)? <= idx {
if self.current_progress(p, aligned_buf)? <= idx {
let mut offset = from_offset;
for chunk in buf.chunks_mut(P::ACTIVE::BLOCK_SIZE) {
for chunk in aligned_buf.chunks_mut(P::ACTIVE::BLOCK_SIZE) {
self.active.read_blocking(p.active(), offset, chunk)?;
offset += chunk.len() as u32;
}
self.dfu
.erase_blocking(p.dfu(), to_offset as u32, to_offset + buf.len() as u32)?;
.erase_blocking(p.dfu(), to_offset as u32, to_offset + P::page_size() as u32)?;
let mut offset = to_offset;
for chunk in buf.chunks(P::DFU::BLOCK_SIZE) {
for chunk in aligned_buf.chunks(P::DFU::BLOCK_SIZE) {
self.dfu.write_blocking(p.dfu(), offset, chunk)?;
offset += chunk.len() as u32;
}
self.update_progress(idx, p, magic)?;
self.update_progress(idx, p, aligned_buf)?;
}
Ok(())
}
fn swap<P: FlashConfig>(&mut self, p: &mut P, magic: &mut [u8], page: &mut [u8]) -> Result<(), BootError> {
let page_size = page.len();
fn swap<P: FlashConfig>(&mut self, p: &mut P, aligned_buf: &mut [u8]) -> Result<(), BootError> {
let page_size = P::page_size();
let page_count = self.active.len() / page_size;
trace!("Page count: {}", page_count);
for page_num in 0..page_count {
@ -326,20 +337,20 @@ impl BootLoader {
let active_from_offset = ((page_count - 1 - page_num) * page_size) as u32;
let dfu_to_offset = ((page_count - page_num) * page_size) as u32;
//trace!("Copy active {} to dfu {}", active_from_offset, dfu_to_offset);
self.copy_page_once_to_dfu(idx, active_from_offset, dfu_to_offset, p, magic, page)?;
self.copy_page_once_to_dfu(idx, active_from_offset, dfu_to_offset, p, aligned_buf)?;
// Copy DFU page to the active page
let active_to_offset = ((page_count - 1 - page_num) * page_size) as u32;
let dfu_from_offset = ((page_count - 1 - page_num) * page_size) as u32;
//trace!("Copy dfy {} to active {}", dfu_from_offset, active_to_offset);
self.copy_page_once_to_active(idx + 1, dfu_from_offset, active_to_offset, p, magic, page)?;
self.copy_page_once_to_active(idx + 1, dfu_from_offset, active_to_offset, p, aligned_buf)?;
}
Ok(())
}
fn revert<P: FlashConfig>(&mut self, p: &mut P, magic: &mut [u8], page: &mut [u8]) -> Result<(), BootError> {
let page_size = page.len();
fn revert<P: FlashConfig>(&mut self, p: &mut P, aligned_buf: &mut [u8]) -> Result<(), BootError> {
let page_size = P::page_size();
let page_count = self.active.len() / page_size;
for page_num in 0..page_count {
let idx = page_count * 2 + page_num * 2;
@ -347,21 +358,22 @@ impl BootLoader {
// Copy the bad active page to the DFU page
let active_from_offset = (page_num * page_size) as u32;
let dfu_to_offset = (page_num * page_size) as u32;
self.copy_page_once_to_dfu(idx, active_from_offset, dfu_to_offset, p, magic, page)?;
self.copy_page_once_to_dfu(idx, active_from_offset, dfu_to_offset, p, aligned_buf)?;
// Copy the DFU page back to the active page
let active_to_offset = (page_num * page_size) as u32;
let dfu_from_offset = ((page_num + 1) * page_size) as u32;
self.copy_page_once_to_active(idx + 1, dfu_from_offset, active_to_offset, p, magic, page)?;
self.copy_page_once_to_active(idx + 1, dfu_from_offset, active_to_offset, p, aligned_buf)?;
}
Ok(())
}
fn read_state<P: FlashConfig>(&mut self, config: &mut P, magic: &mut [u8]) -> Result<State, BootError> {
self.state.read_blocking(config.state(), 0, magic)?;
fn read_state<P: FlashConfig>(&mut self, config: &mut P, aligned_buf: &mut [u8]) -> Result<State, BootError> {
let state_word = &mut aligned_buf[..P::STATE::WRITE_SIZE];
self.state.read_blocking(config.state(), 0, state_word)?;
if !magic.iter().any(|&b| b != SWAP_MAGIC) {
if !state_word.iter().any(|&b| b != SWAP_MAGIC) {
Ok(State::Swap)
} else {
Ok(State::Boot)

22
embassy-boot/boot/src/lib.rs
View file

@ -77,12 +77,8 @@ mod tests {
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()
);
assert_eq!(State::Boot, bootloader.prepare_boot(&mut flash, &mut page).unwrap());
}
#[test]
@ -110,12 +106,11 @@ mod tests {
}
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)
.prepare_boot(&mut SingleFlashConfig::new(&mut flash), &mut page)
.unwrap()
);
@ -132,7 +127,7 @@ mod tests {
assert_eq!(
State::Swap,
bootloader
.prepare_boot(&mut SingleFlashConfig::new(&mut flash), &mut magic, &mut page)
.prepare_boot(&mut SingleFlashConfig::new(&mut flash), &mut page)
.unwrap()
);
@ -150,7 +145,7 @@ mod tests {
assert_eq!(
State::Boot,
bootloader
.prepare_boot(&mut SingleFlashConfig::new(&mut flash), &mut magic, &mut page)
.prepare_boot(&mut SingleFlashConfig::new(&mut flash), &mut page)
.unwrap()
);
}
@ -184,17 +179,12 @@ mod tests {
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
)
.prepare_boot(&mut MultiFlashConfig::new(&mut active, &mut state, &mut dfu), &mut page)
.unwrap()
);
@ -237,14 +227,12 @@ mod tests {
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()