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add note about safety

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This commit is contained in:
bunnie 2025-02-28 16:46:24 +08:00
parent 98bfc724aa
commit e6a85c5573
1 changed files with 7 additions and 2 deletions
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9
loader/src/platform/cramium/update.rs
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@ -160,8 +160,13 @@ pub fn process_update(perclk: u32) {
);
sh1107.draw();
crate::platform::cramium::usb::init_usb();
// it's all unsafe because USB is global mutable state
// safety: this is safe because we're calling this before any access to `USB` static mut
// state, and we also understand that the .data section doesn't exist in the loader and
// we've taken countermeasures to initialize everything "from code", i.e. not relying
// on static compile-time assignments for the static mut state.
unsafe { crate::platform::cramium::usb::init_usb() };
// Below is all unsafe because USB is global mutable state
unsafe {
if let Some(ref mut usb_ref) = crate::platform::cramium::usb::USB {
let usb = &mut *core::ptr::addr_of_mut!(*usb_ref);