From 7ffc62ab8613b097485b2c664093e649907dc2a1 Mon Sep 17 00:00:00 2001
From: Ian McIntyre <me@mciantyre.dev>
Date: Mon, 3 Aug 2026 07:46:10 -0400
Subject: First commit

---
 crates/qemu/Cargo.toml  | 15 +++++++++++
 crates/qemu/src/lib.rs  | 37 +++++++++++++++++++++++++
 crates/qemu/src/main.rs | 72 +++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 124 insertions(+)
 create mode 100644 crates/qemu/Cargo.toml
 create mode 100644 crates/qemu/src/lib.rs
 create mode 100644 crates/qemu/src/main.rs

(limited to 'crates/qemu')

diff --git a/crates/qemu/Cargo.toml b/crates/qemu/Cargo.toml
new file mode 100644
index 0000000..904f696
--- /dev/null
+++ b/crates/qemu/Cargo.toml
@@ -0,0 +1,15 @@
+[package]
+name = "rust-threadx-qemu"
+version = "0.1.0"
+edition = "2024"
+publish = false
+
+[dependencies]
+cortex-m = { workspace = true }
+cortex-m-rt = { workspace = true }
+cortex-m-semihosting = { workspace = true }
+lm3s6965 = { workspace = true }
+panic-semihosting = { version = "0.6", features = ["exit"] }
+
+rust-threadx-cortex-m = { workspace = true }
+rust-threadx-stdio-semihosting = { workspace = true }
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);
+    }
+}
diff --git a/crates/qemu/src/main.rs b/crates/qemu/src/main.rs
new file mode 100644
index 0000000..3a3df38
--- /dev/null
+++ b/crates/qemu/src/main.rs
@@ -0,0 +1,72 @@
+use rust_threadx_qemu::exit_success;
+use std::{
+    sync::{Arc, Condvar, Mutex},
+    time::Duration,
+};
+
+fn main() {
+    println!("Hello, world!");
+    println!("Testing allocations in 0.25 seconds...");
+    std::thread::sleep(Duration::from_millis(250));
+    test_heap_allocation();
+
+    let mtx = Arc::new(Mutex::new(0_u32));
+    let cv = Arc::new(Condvar::new());
+
+    std::thread::scope(|s| {
+        s.spawn(|| {
+            println!("Hello from one thread!");
+            let mut guard = mtx.lock().unwrap();
+            *guard += 1;
+            cv.notify_all();
+        });
+    });
+
+    let (m, c) = (mtx.clone(), cv.clone());
+    std::thread::spawn(move || {
+        println!("Hello from another thread!");
+
+        let guard = m.lock().unwrap();
+        let mut guard = c.wait_while(guard, |c| *c != 1).unwrap();
+        *guard += 1;
+        c.notify_all();
+    })
+    .join()
+    .unwrap();
+
+    let guard = mtx.lock().unwrap();
+    let guard = cv.wait_while(guard, |c| *c != 2).unwrap();
+    assert_eq!(*guard, 2);
+
+    echo_stdin();
+    exit_success();
+}
+
+fn echo_stdin() {
+    use std::io::{self, Write};
+
+    print!("Enter a message: ");
+    // `print!` does not flush, so make sure the prompt reaches the host before
+    // we block waiting on input.
+    io::stdout().flush().ok();
+
+    let mut message = String::new();
+    match io::stdin().read_line(&mut message) {
+        Ok(0) => println!("No message received (EOF)"),
+        Ok(_) => println!("You said: {}", message.trim_end()),
+        Err(e) => println!("Failed to read message: {e}"),
+    }
+}
+
+fn test_heap_allocation() {
+    use core::hint::black_box;
+
+    for len in [32usize, 64, 128] {
+        let mut v: Vec<usize> = Vec::with_capacity(len);
+        for i in 0..len {
+            v.push(black_box(i));
+        }
+        let v = black_box(v);
+        println!("Allocated vector with {} elements", v.len());
+    }
+}
-- 
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