1 files changed, 27 insertions, 0 deletions
diff --git a/src/arch/riscv64/io/uart.rs b/src/arch/riscv64/io/uart.rs
new file mode 100644
index 0000000..7aafeef
--- /dev/null
+++ b/src/arch/riscv64/io/uart.rs
@@ -0,0 +1,27 @@
+use core::fmt;
+use core::fmt::Write;
+
+pub fn _print(args: fmt::Arguments) {
+    // Not thread safe but no dependencies
+    let mut stdout = Stdout;
+    fmt::write(&mut stdout, args);
+}
+
+struct Stdout;
+impl Write for Stdout {
+    fn write_str(&mut self, s: &str) -> fmt::Result {
+        print_string(s);
+        Ok(())
+    }
+}
+
+pub fn print_string(s: &str) {
+    let uart_base = 0x10000000 as *mut u8;
+    while unsafe { uart_base.add(5).read_volatile() } & 0x20 == 0 {}
+
+    for c in s.chars() {
+        unsafe {
+            uart_base.write_volatile(c as u8);
+        }
+    }
+}