saymrwulf/betrusted-curve25519-dalek-source
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make ensure_engine() falliable

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this will trigger software fallback
This commit is contained in:
bunnie 2024-03-25 13:43:38 +08:00
parent 275f586b60
commit 0b052f5f79
1 changed files with 6 additions and 5 deletions
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11
curve25519-dalek/src/backend/serial/u32e/mod.rs
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@ -34,6 +34,7 @@ pub(crate) const RF_U8_BASE: usize = 0x1_0000;
#[allow(dead_code)]
pub(crate) const RF_U32_BASE: usize = 0x1_0000 / 4;
/// It is safe to call this multiple times.
pub fn free_engine() {
log::debug!("free engine");
if let Some(base) = unsafe { ENGINE_BASE.take() } {
@ -46,15 +47,15 @@ pub fn free_engine() {
}
}
pub fn ensure_engine() {
/// It is safe to call this multiple times.
pub fn ensure_engine() -> Result<(), xous::Error> {
if unsafe { ENGINE_BASE.is_none() } {
let base = xous::syscall::map_memory(
xous::MemoryAddress::new(utra::engine::HW_ENGINE_BASE),
None,
4096,
xous::MemoryFlags::R | xous::MemoryFlags::W,
)
.expect("couldn't map engine CSR range");
)?;
log::debug!("claiming engine csr {:x?}", base.as_ptr());
unsafe {
ENGINE_BASE = Some(base);
@ -66,13 +67,13 @@ pub fn ensure_engine() {
None,
HW_ENGINE_MEM_LEN,
xous::MemoryFlags::R | xous::MemoryFlags::W,
)
.expect("couldn't map engine memory window range");
)?;
log::debug!("claiming engine mem {:x?}", mem.as_ptr());
unsafe { ENGINE_MEM = Some(mem) };
}
let mut engine = utralib::CSR::new(unsafe { ENGINE_BASE.unwrap() }.as_mut_ptr() as *mut u32);
engine.rmwf(utra::engine::POWER_ON, 1);
Ok(())
}
/// Safety: must be called after ensure_engine()