1 files changed, 37 insertions, 0 deletions
diff --git a/crates/qemu/src/lib.rs b/crates/qemu/src/lib.rs
new file mode 100644
index 0000000..dc91465
--- /dev/null
+++ b/crates/qemu/src/lib.rs
@@ -0,0 +1,37 @@
+#![no_std]
+
+use cortex_m_rt as _;
+use lm3s6965 as _;
+
+use rust_threadx_cortex_m as _;
+use rust_threadx_stdio_semihosting as _;
+
+pub fn exit_success() -> ! {
+    use cortex_m_semihosting::debug::*;
+    exit(EXIT_SUCCESS);
+    unreachable!()
+}
+
+// Designed for ARMv6-M. Just enough to get the example
+// running in QEMU with a meaningless system tick.
+#[unsafe(no_mangle)]
+pub extern "C" fn _tx_initialize_low_level() {
+    use cortex_m::{Peripherals, peripheral::scb::SystemHandler};
+
+    cortex_m::interrupt::disable();
+
+    let Peripherals {
+        mut SYST, mut SCB, ..
+    } = Peripherals::take().unwrap();
+
+    SYST.set_reload(80000 - 1);
+    SYST.clear_current();
+    SYST.enable_interrupt();
+    SYST.enable_counter();
+
+    unsafe {
+        SCB.set_priority(SystemHandler::SysTick, 0x40);
+        SCB.set_priority(SystemHandler::PendSV, 0xff);
+        SCB.set_priority(SystemHandler::SVCall, 0xff);
+    }
+}