forked from M-Labs/artiq
runtime: get rid of config_dummy.rs. NFC.
Use the same strategy as elsewhere.
This commit is contained in:
whitequark
parent
0ede5d8638
commit
6cbf8786d8
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@ -1,192 +1,220 @@
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use core::str;
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use std::btree_map::BTreeMap;
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use byteorder::{ByteOrder, BigEndian};
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use board::{mem, csr, cache, spiflash};
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#[cfg(has_spiflash)]
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mod imp {
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use core::str;
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use std::btree_map::BTreeMap;
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use byteorder::{ByteOrder, BigEndian};
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use board::{mem, csr, cache, spiflash};
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const ADDR: usize = mem::FLASH_BOOT_ADDRESS + 0x80000 /* max runtime size */;
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const SIZE: usize = csr::CONFIG_SPIFLASH_SECTOR_SIZE as usize;
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const ADDR: usize = mem::FLASH_BOOT_ADDRESS + 0x80000 /* max runtime size */;
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const SIZE: usize = csr::CONFIG_SPIFLASH_SECTOR_SIZE as usize;
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mod lock {
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use core::slice;
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use core::sync::atomic::{AtomicUsize, Ordering};
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mod lock {
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use core::slice;
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use core::sync::atomic::{AtomicUsize, Ordering};
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static LOCKED: AtomicUsize = AtomicUsize::new(0);
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static LOCKED: AtomicUsize = AtomicUsize::new(0);
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pub struct Lock;
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pub struct Lock;
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impl Lock {
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pub fn take() -> Result<Lock, ()> {
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if LOCKED.swap(1, Ordering::SeqCst) != 0 {
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Err(()) // already locked
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} else {
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Ok(Lock) // locked now
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impl Lock {
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pub fn take() -> Result<Lock, ()> {
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if LOCKED.swap(1, Ordering::SeqCst) != 0 {
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Err(()) // already locked
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} else {
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Ok(Lock) // locked now
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}
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}
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pub fn data(&self) -> &'static [u8] {
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unsafe { slice::from_raw_parts(super::ADDR as *const u8, super::SIZE) }
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}
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}
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pub fn data(&self) -> &'static [u8] {
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unsafe { slice::from_raw_parts(super::ADDR as *const u8, super::SIZE) }
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}
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}
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impl Drop for Lock {
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fn drop(&mut self) {
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LOCKED.store(0, Ordering::SeqCst)
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}
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}
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}
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pub use self::lock::Lock;
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struct Iter<'a> {
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data: &'a [u8],
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offset: usize
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}
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impl<'a> Iter<'a> {
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fn new(data: &'a [u8]) -> Iter<'a> {
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Iter { data: data, offset: 0 }
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}
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}
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impl<'a> Iterator for Iter<'a> {
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type Item = Result<(&'a [u8], &'a [u8]), ()>;
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fn next(&mut self) -> Option<Self::Item> {
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let data = &self.data[self.offset..];
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if data.len() < 4 {
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error!("offset {}: truncated record", self.offset);
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return Some(Err(()))
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}
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let record_size = BigEndian::read_u32(data) as usize;
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if record_size < 4 {
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error!("offset {}: invalid record size", self.offset);
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return Some(Err(()))
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}
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if record_size == !0 /* all ones; erased flash */ {
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return None
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}
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let record_body = &data[4..record_size];
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match record_body.iter().position(|&x| x == 0) {
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None => {
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error!("offset {}: missing separator", self.offset);
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Some(Err(()))
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}
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Some(pos) => {
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self.offset += record_size;
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let (key, zero_and_value) = record_body.split_at(pos);
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Some(Ok((key, &zero_and_value[1..])))
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impl Drop for Lock {
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fn drop(&mut self) {
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LOCKED.store(0, Ordering::SeqCst)
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}
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}
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}
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}
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pub fn read<F: FnOnce(Result<&[u8], ()>) -> R, R>(key: &str, f: F) -> R {
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f(Lock::take().and_then(|lock| {
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let mut iter = Iter::new(lock.data());
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let mut value = &[][..];
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while let Some(result) = iter.next() {
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let (record_key, record_value) = result?;
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if key.as_bytes() == record_key {
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// last write wins
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value = record_value
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use self::lock::Lock;
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struct Iter<'a> {
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data: &'a [u8],
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offset: usize
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}
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impl<'a> Iter<'a> {
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fn new(data: &'a [u8]) -> Iter<'a> {
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Iter { data: data, offset: 0 }
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}
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}
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impl<'a> Iterator for Iter<'a> {
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type Item = Result<(&'a [u8], &'a [u8]), ()>;
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fn next(&mut self) -> Option<Self::Item> {
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let data = &self.data[self.offset..];
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if data.len() < 4 {
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error!("offset {}: truncated record", self.offset);
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return Some(Err(()))
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}
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let record_size = BigEndian::read_u32(data) as usize;
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if record_size < 4 {
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error!("offset {}: invalid record size", self.offset);
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return Some(Err(()))
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}
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if record_size == !0 /* all ones; erased flash */ {
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return None
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}
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let record_body = &data[4..record_size];
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match record_body.iter().position(|&x| x == 0) {
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None => {
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error!("offset {}: missing separator", self.offset);
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Some(Err(()))
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}
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Some(pos) => {
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self.offset += record_size;
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let (key, zero_and_value) = record_body.split_at(pos);
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Some(Ok((key, &zero_and_value[1..])))
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}
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}
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}
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Ok(value)
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}))
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}
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pub fn read_str<F: FnOnce(Result<&str, ()>) -> R, R>(key: &str, f: F) -> R {
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read(key, |result| {
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f(result.and_then(|value| str::from_utf8(value).map_err(|_| ())))
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})
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}
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fn append_at(mut offset: usize, key: &[u8], value: &[u8]) -> Result<usize, ()> {
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let record_size = 4 + key.len() + 1 + value.len();
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if offset + record_size > SIZE {
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return Err(())
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}
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let mut record_size_bytes = [0u8; 4];
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BigEndian::write_u32(&mut record_size_bytes[..], record_size as u32);
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pub fn read<F: FnOnce(Result<&[u8], ()>) -> R, R>(key: &str, f: F) -> R {
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f(Lock::take().and_then(|lock| {
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let mut iter = Iter::new(lock.data());
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let mut value = &[][..];
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while let Some(result) = iter.next() {
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let (record_key, record_value) = result?;
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if key.as_bytes() == record_key {
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// last write wins
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value = record_value
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}
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}
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Ok(value)
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}))
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}
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spiflash::write(ADDR + offset, &record_size_bytes[..]);
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offset += record_size_bytes.len();
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pub fn read_str<F: FnOnce(Result<&str, ()>) -> R, R>(key: &str, f: F) -> R {
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read(key, |result| {
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f(result.and_then(|value| str::from_utf8(value).map_err(|_| ())))
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})
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}
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spiflash::write(ADDR + offset, key);
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offset += key.len();
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spiflash::write(ADDR + offset, &[0]);
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offset += 1;
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spiflash::write(ADDR + offset, value);
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offset += value.len();
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cache::flush_l2_cache();
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Ok(offset)
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}
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fn compact() -> Result<(), ()> {
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let lock = Lock::take()?;
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let mut items = BTreeMap::new();
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{
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let mut iter = Iter::new(lock.data());
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while let Some(result) = iter.next() {
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let (key, value) = result?;
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items.insert(key, value);
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fn append_at(mut offset: usize, key: &[u8], value: &[u8]) -> Result<usize, ()> {
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let record_size = 4 + key.len() + 1 + value.len();
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if offset + record_size > SIZE {
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return Err(())
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}
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let mut record_size_bytes = [0u8; 4];
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BigEndian::write_u32(&mut record_size_bytes[..], record_size as u32);
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spiflash::write(ADDR + offset, &record_size_bytes[..]);
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offset += record_size_bytes.len();
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spiflash::write(ADDR + offset, key);
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offset += key.len();
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spiflash::write(ADDR + offset, &[0]);
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offset += 1;
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spiflash::write(ADDR + offset, value);
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offset += value.len();
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cache::flush_l2_cache();
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Ok(offset)
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}
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spiflash::erase_sector(ADDR);
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cache::flush_l2_cache();
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fn compact() -> Result<(), ()> {
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let lock = Lock::take()?;
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let mut offset = 0;
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for (key, value) in items {
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offset = append_at(offset, key, value)?;
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}
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Ok(())
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}
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fn append(key: &str, value: &[u8]) -> Result<(), ()> {
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let lock = Lock::take()?;
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let free_offset = {
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let mut iter = Iter::new(lock.data());
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while let Some(result) = iter.next() {
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let _ = result?;
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let mut items = BTreeMap::new();
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{
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let mut iter = Iter::new(lock.data());
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while let Some(result) = iter.next() {
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let (key, value) = result?;
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items.insert(key, value);
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}
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}
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iter.offset
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};
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append_at(free_offset, key.as_bytes(), value)?;
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Ok(())
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}
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spiflash::erase_sector(ADDR);
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cache::flush_l2_cache();
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pub fn write(key: &str, value: &[u8]) -> Result<(), ()> {
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match append(key, value) {
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Ok(()) => (),
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Err(()) => {
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compact()?;
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append(key, value)?;
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let mut offset = 0;
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for (key, value) in items {
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offset = append_at(offset, key, value)?;
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}
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Ok(())
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}
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fn append(key: &str, value: &[u8]) -> Result<(), ()> {
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let lock = Lock::take()?;
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let free_offset = {
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let mut iter = Iter::new(lock.data());
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while let Some(result) = iter.next() {
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let _ = result?;
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}
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iter.offset
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};
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append_at(free_offset, key.as_bytes(), value)?;
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Ok(())
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}
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pub fn write(key: &str, value: &[u8]) -> Result<(), ()> {
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match append(key, value) {
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Ok(()) => (),
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Err(()) => {
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compact()?;
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append(key, value)?;
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}
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}
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Ok(())
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}
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pub fn remove(key: &str) -> Result<(), ()> {
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write(key, &[])
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}
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pub fn erase() -> Result<(), ()> {
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let _lock = Lock::take()?;
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spiflash::erase_sector(ADDR);
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cache::flush_l2_cache();
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Ok(())
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}
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Ok(())
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}
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pub fn remove(key: &str) -> Result<(), ()> {
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write(key, &[])
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#[cfg(not(has_spiflash))]
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mod imp {
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pub fn read<F: FnOnce(Result<&[u8], ()>) -> R, R>(_key: &str, f: F) -> R {
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f(Err(()))
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}
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pub fn read_str<F: FnOnce(Result<&str, ()>) -> R, R>(_key: &str, f: F) -> R {
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f(Err(()))
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}
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pub fn write(_key: &str, _value: &[u8]) -> Result<(), ()> {
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Err(())
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}
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pub fn remove(_key: &str) -> Result<(), ()> {
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Err(())
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}
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pub fn erase() -> Result<(), ()> {
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Err(())
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}
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}
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pub fn erase() -> Result<(), ()> {
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let _lock = Lock::take()?;
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spiflash::erase_sector(ADDR);
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cache::flush_l2_cache();
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Ok(())
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}
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pub use self::imp::*;
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@ -1,19 +0,0 @@
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pub fn read<F: FnOnce(Result<&[u8], ()>) -> R, R>(_key: &str, f: F) -> R {
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f(Err(()))
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}
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pub fn read_str<F: FnOnce(Result<&str, ()>) -> R, R>(_key: &str, f: F) -> R {
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f(Err(()))
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}
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pub fn write(_key: &str, _value: &[u8]) -> Result<(), ()> {
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Err(())
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}
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pub fn remove(_key: &str) -> Result<(), ()> {
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Err(())
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}
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pub fn erase() -> Result<(), ()> {
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Err(())
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}
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@ -34,10 +34,7 @@ macro_rules! borrow_mut {
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})
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}
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#[cfg(has_spiflash)]
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mod config;
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#[cfg(not(has_spiflash))]
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#[path="config_dummy.rs"] mod config;
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mod ethmac;
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mod rtio_mgt;
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