Save code: shutdown

rustsbi/src/ecall.rs

@@ -20,7 +20,7 @@ const LEGACY_SEND_IPI: usize = 0x04;
 // const LEGACY_REMOTE_FENCE_I: usize = 0x05;
 // const LEGACY_REMOTE_SFENCE_VMA: usize = 0x06;
 // const LEGACY_REMOTE_SFENCE_VMA_ASID: usize = 0x07;
-// const LEGACY_SHUTDOWN: usize = 0x08;
+const LEGACY_SHUTDOWN: usize = 0x08;
 
 /// Supervisor environment call handler function
 ///
@@ -75,6 +75,7 @@ pub fn handle_ecall(extension: usize, function: usize, param: [usize; 4]) -> Sbi
         LEGACY_CONSOLE_PUTCHAR => legacy::console_putchar(param[0]).legacy_void(param[0], param[1]),
         LEGACY_CONSOLE_GETCHAR => legacy::console_getchar().legacy_return(param[1]),
         LEGACY_SEND_IPI => legacy::send_ipi(param[0]).legacy_void(param[0], param[1]),
+        LEGACY_SHUTDOWN => legacy::shutdown().legacy_void(param[0], param[1]),
         _ => SbiRet::not_supported(),
     }
 }

rustsbi/src/ecall/legacy.rs

@@ -65,3 +65,10 @@ pub fn set_timer_32(arg0: usize, arg1: usize) -> SbiRet {
     }
     SbiRet::ok(0)
 }
+
+#[inline]
+pub fn shutdown() -> SbiRet {
+    // todo: wrap
+    loop {}
+    SbiRet::ok(0)
+}

rustsbi/src/privileged.rs

@@ -25,16 +25,17 @@
 #[inline]
 pub unsafe fn enter_privileged(mhartid: usize, dtb_pa: usize) -> ! {
     match () {
-        #[cfg(riscv)]
+        // todo: todo
+        // #[cfg(riscv)]
         () => asm!("
             csrrw   sp, mscratch, sp
             mret
         ", in("a0") mhartid, in("a1") dtb_pa, options(nomem, noreturn)),
-        #[cfg(not(riscv))]
-        () => {
-            drop(mhartid);
-            drop(dtb_pa);
-            unimplemented!("not RISC-V instruction set architecture")
-        }
+        // #[cfg(not(riscv))]
+        // () => {
+        //     drop(mhartid);
+        //     drop(dtb_pa);
+        //     unimplemented!("not RISC-V instruction set architecture")
+        // }
     }
 }