initial commit

1 files changed, 35 insertions, 0 deletions

diff --git a/src/asm.rs b/src/asm.rs
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index 0000000..3337626
--- /dev/null
+++ b/src/asm.rs
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+//! Miscellaneous assembly instructions
+
+/// Puts the processor in Debug state. Debuggers can pick this up as a "breakpoint".
+///
+/// Optionally, an "immediate" value (in the 0-255 range) can be passed to `bkpt!`. The debugger can
+/// then read this value using the Program Counter (PC).
+#[macro_export]
+macro_rules! bkpt {
+    () => {
+        asm!("bkpt" :::: "volatile");
+    };
+    ($imm:expr) => {
+        asm!(concat!("bkpt #", stringify!($imm)) :::: "volatile");
+    };
+}
+
+/// Wait for event
+pub unsafe fn wfe() {
+    match () {
+        #[cfg(target_arch = "arm")]
+        () => asm!("wfe" :::: "volatile"),
+        #[cfg(not(target_arch = "arm"))]
+        () => {}
+    }
+}
+
+/// Wait for interupt
+pub unsafe fn wfi() {
+    match () {
+        #[cfg(target_arch = "arm")]
+        () => asm!("wfi" :::: "volatile"),
+        #[cfg(not(target_arch = "arm"))]
+        () => {}
+    }
+}