sbi spec uses a6, a7 as sbicall id, so we need to set a6 to 0

2022-06-21 23:57:33 +08:00 · 2022-06-21 23:57:33 +08:00 · 3ef23549bf
commit 3ef23549bf
parent 0e1f637e28
1 changed files with 1 additions and 0 deletions
--- a/os/src/sbi.rs
+++ b/os/src/sbi.rs
@ -17,6 +17,7 @@ fn sbi_call(which: usize, arg0: usize, arg1: usize, arg2: usize) -> usize {
    let mut ret;
    unsafe {
        core::arch::asm!(
+            "li x16, 0",
            "ecall",
            inlateout("x10") arg0 => ret,
            in("x11") arg1,