xous: misc fixes + add network support #119408
Commits on Jan 13, 2024
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xous: ffi: fix lend_impl() return values
The `ret1` and `ret2` return values from lend operations are returned in $a1 and $a2. This function incorrectly pulled them from $a6 and $a7, causing them to always be `0`. Signed-off-by: Sean Cross <sean@xobs.io>
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xous: ffi: correct size of freed memory
The amount of memory allocated was multiplied by sizeof::<T>(), so the amount of memory to be freed should also be multiplied by sizeof::<T>(). Signed-off-by: Sean Cross <sean@xobs.io>
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xous: std: thread_parking: fix deadlocks
Fix a deadlock condition that can occur when a thread is awoken in between the point at which it checks its wake state and the point where it actually waits. This change will cause the waker to continuously send Notify messages until it actually wakes up the target thread. Signed-off-by: Sean Cross <sean@xobs.io>
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std: xous: rework condvar to fix soundness issues
Rework the Condvar implementation on Xous to ensure notifications are not missed. This involves keeping track of how many times a Condvar timed out and synchronizing based on that. Signed-off-by: Sean Cross <sean@xobs.io>
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std: xous: pass entire memory range to flag updater
When updating memory flags via `update_memory_flags()`, ensure we multiply the slice length by the element size to get the full memory size. Signed-off-by: Sean Cross <sean@xobs.io>
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std: xous: use blocking_scalars for mutex unlock
Use blocking scalars when unlocking a mutex. This ensures that mutexes are unlocked immediately rather than dangling. Signed-off-by: Sean Cross <sean@xobs.io>
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std: xous: rewrite rwlock to be more robust
Add more checks to RwLock on Xous. As part of this, ensure the variable is in a good state when unlocking. Additionally, use the global `yield_now()` rather than platform-specific `do_yield()`. Signed-off-by: Sean Cross <sean@xobs.io>
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std: once: use queue implementation on Xous
Use the global queue implementation of Once when running on Xous. This gets us a thread-safe implementation, rather than using the non-threadsafe `unsupported` implementation. Signed-off-by: Sean Cross <sean@xobs.io>
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std: xous: fix thread_local_key under tests
When running tests, libstd gets implemented as a second library. Due to this fact, the `create()` and `destroy()` functions come from different libraries. To work around this, stash the `destroy_tls()` pointer in the first unused slot in the thread local storage pool. That way even if the destruction comes from a different version of libstd, the correct `DTORS` list will be consulted. Signed-off-by: Sean Cross <sean@xobs.io>
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std: xous: share allocator symbol in tests
When using the testing framework, a second copy of libstd is built and linked. Use a global symbol for the `DLMALLOC` variable and mark it as `extern` when building as a test. This ensures we only have a single allocator even when running tests. Signed-off-by: Sean Cross <sean@xobs.io>
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xous: net: initial commit of network support
This is an initial commit of network support for Xous. On hardware, is backed by smoltcp running via a Xous server in a separate process space. This patch adds TCP and UDP client and server support as well as DNS resolution support using the dns Xous server. Signed-off-by: Sean Cross <sean@xobs.io>
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std: xous: mark stdio structs as
repr(C)Ensure these structs have a well-defined ABI layout. Signed-off-by: Sean Cross <sean@xobs.io>
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std: xous: use constants for stdout and stderr
Use constants for the opcodes when writing to stdout or stderr. There still is no stdin operation. Signed-off-by: Sean Cross <sean@xobs.io>
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xous: thread: mark thread_main() as divergent
The thread wrapper function never returns, so we can mark it as divergent. Signed-off-by: Sean Cross <sean@xobs.io>
