ch1: Print and shutdown based on sbi

src/sbi.rs

@@ -0,0 +1,19 @@
+pub fn console_write_byte(c: u8) {
+    sbi_rt::console_write_byte(c);
+}
+
+pub fn console_write(bytes: &[u8]) {
+    let range = bytes.as_ptr_range();
+    let bytes = sbi_rt::Physical::new(bytes.len(), range.start as usize, range.end as usize);
+    sbi_rt::console_write(bytes);
+}
+
+pub fn shutdown(failure: bool) -> ! {
+    use sbi_rt::{system_reset, NoReason, Shutdown, SystemFailure};
+    if !failure {
+        system_reset(Shutdown, NoReason);
+    } else {
+        system_reset(Shutdown, SystemFailure);
+    }
+    unreachable!()
+}