Update linker & Hello k210/qemu(release mode).

os/src/sbi.rs

@@ -0,0 +1,39 @@
+#![allow(unused)]
+
+const SBI_SET_TIMER: usize = 0;
+const SBI_CONSOLE_PUTCHAR: usize = 1;
+const SBI_CONSOLE_GETCHAR: usize = 2;
+const SBI_CLEAR_IPI: usize = 3;
+const SBI_SEND_IPI: usize = 4;
+const SBI_REMOTE_FENCE_I: usize = 5;
+const SBI_REMOTE_SFENCE_VMA: usize = 6;
+const SBI_REMOTE_SFENCE_VMA_ASID: usize = 7;
+const SBI_SHUTDOWN: usize = 8;
+
+#[inline(always)]
+fn sbi_call(which: usize, arg0: usize, arg1: usize, arg2: usize) -> usize {
+    let mut ret;
+    unsafe {
+        llvm_asm!("ecall"
+            : "={x10}" (ret)
+            : "{x10}" (arg0), "{x11}" (arg1), "{x12}" (arg2), "{x17}" (which)
+            : "memory"
+            : "volatile"
+        );
+    }
+    ret
+}
+
+pub fn console_putchar(c: usize) {
+    sbi_call(SBI_CONSOLE_PUTCHAR, c, 0, 0);
+}
+
+pub fn console_getchar() -> usize {
+    sbi_call(SBI_CONSOLE_GETCHAR, 0, 0, 0)
+}
+
+pub fn shutdown() -> ! {
+    sbi_call(SBI_SHUTDOWN, 0, 0, 0);
+    panic!("It should shutdown!");
+}
+